CN205279906U - Intelligence tape measure and intelligent tape measure circuit - Google Patents

Abstract

The utility model discloses intelligence tape measure and intelligent tape measure circuit, in the intelligence tape measure circuit, be provided with the clock module on the PCB board, a bluetooth modul, the button module, the display module, infrared transmission module, infrared receiver module, code wheel circuit and MCU control module, provide precise time by the clock module, bluetooth module receives external equipment's data, and show by the display module, the conducting block that the brush of intelligence tape measure rotated each code wheel circuit when measuring draws the living falling edge of low yield to break off triggering MCU control module in proper order, MCU control block detection during to the falling edge signal output switch signal awaken infrared transceiver module up, code wheel circuit output interrupt signal gives MCU control module when the tape band is pulled out, and MCU control module just awakens infrared transceiver module work up, and infrared transceiver module need not to keep in real time operating condition, has saved power consumption, has reduced the consumption of intelligent tape measure to avoid frequently changing the battery, save the cost of battery.

Description

Intelligent measuring tape and Intelligent measuring tape circuit

Technical field

The utility model relates to tape measure, in particular to a kind of Intelligent measuring tape and Intelligent measuring tape circuit.

Background technology

Existing Intelligent measuring tape can realize automatization and read chi and transfer, tape measure bar is provided with digital calibration, only need the length of artificial pull-out tape measure bar Measuring Object, after the stopping of tape measure bar pulls, by the measurement image in collection tape measure bar chi face as measuring result, get final product the concrete length information of automatic display measurement like this without the need to artificially reading scale. But, it may also be useful in time, needs to be powered by the correlation module gathering measurement image in real time, just can avoid Lou gathering. When not measuring, also power supply can cause waste of energy, increases power consumption, existing Intelligent measuring tape is easily generated heat. And existing Intelligent measuring tape cannot with communication external, measurement pattern is single.

Practical novel content

In view of above-mentioned the deficiencies in the prior art part, the purpose of this utility model is to provide Intelligent measuring tape and Intelligent measuring tape circuit, to solve in existing Intelligent measuring tape use procedure, keeps working order to cause waste of energy time unmeasured, and the problem that power consumption is high.

In order to achieve the above object, the utility model takes following technical scheme:

A kind of Intelligent measuring tape circuit, it comprises pcb board, is provided with on described pcb board:

For providing the clock module of clocksignal;

For receiving the bluetooth module of wireless messages;

For switching the key-press module of the measurement pattern of Intelligent measuring tape;

For the display module of display measurement data;

For continuing to send the Gray code of Infrared irradiation tape measure band within the default time according to switch signal, and generate the infrared emission module of corresponding electric current signal according to the reflected light of Gray code;

The infrared receiving module of anti-interference process is trembled for converting described electric current signal to voltage signal and carry out disappearing;

For controlling the MCU control module of the working order of the hardware circuit of Intelligent measuring tape;

Code-disc circuit, described code-disc circuit is provided with Pu Tong district and some the conducting blocks lining up a circle, is provided with isolated area between adjacent conductive block; Xth conducting block is connected the output pin for code-disc circuit with xth+n conducting block of arranged in sequence, and each output pin all connects MCU control module; Brush rotates and each conducting block draws low yield raw negative edge down trigger MCU control module successively, and when MCU control module detects negative edge signal, output switching signal wakes infrared transceiver module up; Wherein, x, n are positive integer;

Described clock module, bluetooth module, key-press module, display module, infrared emission module, infrared receiving module and code-disc circuit all connect MCU control module, infrared emission model calling infrared receiving module.

In described Intelligent measuring tape circuit, described MCU control module comprises MCU chip, the first electric capacity, the 2nd electric capacity, the 3rd electric capacity and crystal oscillator, the P0.27/AIN1/XL1 end of described MCU chip, P0.28 end and P0.29 end connect clock module, the DEC1 end of described MCU chip is by the first electric capacity ground connection, the XC2 end of described MCU chip connect crystal oscillator the 3rd end, also by the 2nd electric capacity ground connection, the XC1 end of described MCU chip connect crystal oscillator the 1st end, also by the 3rd electric capacity ground connection, the 2nd end of described crystal oscillator and the 4th equal ground connection of end.

In described Intelligent measuring tape circuit, described MCU control module also comprises the first inductance, the 2nd inductance, the 4th electric capacity, the 5th electric capacity, the 6th electric capacity and the 7th electric capacity, the DCC end of described MCU chip connects one end of A+3V3 and the 5th electric capacity successively by the first inductance and the 2nd inductance, the other end ground connection of described 5th electric capacity, the vdd terminal of described MCU chip connect VDD_BT power end, also by the 4th electric capacity ground connection; The DEC2 end of described MCU chip is by the 6th electric capacity ground connection, and the AVDD end of MCU chip connects A+3V3, also by the 7th electric capacity ground connection.

In described Intelligent measuring tape circuit, described bluetooth module comprises by the 8th electric capacity, 9th electric capacity, tenth electric capacity, 11 electric capacity, 3rd inductance, 4th inductance, 5th inductance and antenna, the ANT2 end of described MCU chip connects one end of the 3rd inductance and one end of the 8th electric capacity, the other end of described 3rd inductance connects the ANT1 end of MCU chip and one end of the 4th inductance, the other end of described 4th inductance connects the VDD_PA end of MCU chip, also by the 9th electric capacity ground connection, the other end of described 8th electric capacity is by the 5th inductance ground connection, one end of antenna and the 11 electric capacity is also connected by the tenth electric capacity, the other end ground connection of described 11 electric capacity.

In described Intelligent measuring tape circuit, described clock module comprises clock chip, the first resistance, the 2nd resistance and the 12 electric capacity, described clock chip /IRQ end connects the P0.27/AIN1/XL1 end of MCU chip, also connects one end of the 12 electric capacity by the first resistance and VDD_BT powers end, the other end ground connection of described 12 electric capacity, described clock chip /IRT end connects VDD_BT by the 2nd resistance and powers end, the SCL end of described clock chip connects the P0.28 end of MCU chip, and the SDA end of clock chip connects the P0.29 end of MCU chip.

In described Intelligent measuring tape circuit, described key-press module comprises the first button, the 2nd button, the 3rd button, the 4th button, the 3rd resistance, the 4th resistance, the 5th resistance and the 6th resistance, one end of described 3rd resistance connects the P0.00/AREF0 end of MCU chip, and the other end of the 3rd resistance is by the first button ground connection; One end of described 4th resistance connects the P0.30 end of MCU chip, and the other end of the 4th resistance is by the 2nd button ground connection; One end of described 5th resistance connects the P0.20 end of MCU chip, and the other end of the 5th resistance is by the 3rd button ground connection; One end of described 6th resistance connects the P0.19 end of MCU chip, and the other end of the 6th resistance is by the 4th button ground connection.

In described Intelligent measuring tape circuit, described infrared emission module comprises:

For receiving the first switch signal, continue to send first group of Infrared irradiation Gray code within the default time according to the first switch signal, and generate the first transmitting unit of first group of electric current signal corresponding to high 3 take off data according to reflected light;

For receiving the 2nd switch signal, continue according to the 2nd switch signal to send the 2nd group of Infrared irradiation Gray code within the default time, and generate the 2nd transmitting unit of the 2nd group of electric current signal corresponding to low 3 take off data according to reflected light;

Described first transmitting unit, the 2nd transmitting unit connect infrared receiving module and MCU chip;

Described infrared receiving module comprises:

For receiving described first group of electric current signal and convert first group of voltage signal to, first group of voltage signal is disappeared tremble anti-interference process export to MCU chip first reception unit;

For receiving the 2nd group of electric current signal and convert the 2nd group of voltage signal to, the 2nd group of voltage signal is disappeared and trembles the 2nd reception unit that MCU is exported in anti-interference process;

Described first reception unit connects the first transmitting unit and MCU chip, and the 2nd reception unit connects the 2nd transmitting unit and MCU chip.

In described Intelligent measuring tape circuit, described first transmitting unit comprises the first switching tube, the 2nd switching tube, the 7th resistance, the 8th resistance, the 9th resistance, the first photo-sensor, the 2nd photo-sensor, the 3rd photo-sensor, the 13 electric capacity, the 14 electric capacity, the 15 electric capacity, the tenth resistance, the 11 resistance, the 12 resistance and the 13 resistance;

The P0.09 end that the grid of described first switching tube connects the P0.08 end of MCU chip, the grid of the 2nd switching tube connects MCU chip, the drain electrode of the first switching tube connects the 1st pin of the first photo-sensor by the 7th resistance, 2nd pin of the first photo-sensor connects the 3rd pin of the first photo-sensor and VDD_IR powers end, the 4th pin of the first photo-sensor connects the first reception unit; The drain electrode of described 2nd switching tube is connected the 1st pin of the 2nd photo-sensor by the 8th resistance, is also connected the 1st pin of the 3rd photo-sensor by the 9th resistance, 2nd pin of the 2nd photo-sensor connects the 3rd pin of the 2nd photo-sensor and VDD_IR powers end, 4th pin of the 2nd photo-sensor connects the first reception unit, 2nd pin of the 3rd photo-sensor connects the 3rd pin of the 3rd photo-sensor and VDD_IR powers end, the 4th pin of the 3rd photo-sensor connects first and receives unit; The grid of described first switching tube is by the tenth resistance ground connection, the P0.08 end also being connected MCU chip by the 11 resistance, the grid of the 2nd switching tube is by the 12 resistance ground connection, the P0.09 end also being connected MCU chip by the 13 resistance, 13 capacitances in series is on the 2nd between pin and ground of the first photo-sensor, 14 capacitances in series is on the 2nd between pin and ground of the 2nd photo-sensor, and the 15 capacitances in series is on the 2nd between pin and ground of the 3rd photo-sensor.

In described Intelligent measuring tape circuit, described first reception unit comprises single channel reverser, two-way reverser, the 3rd switching tube, the 4th switching tube, the 5th switching tube, the 14 resistance, the 15 resistance, the 16 resistance, the 17 resistance, the 18 resistance, the 19 resistance, the 16 electric capacity, the 17 electric capacity, the 20 resistance, the 21 resistance and the 22 resistance; The base stage of described 3rd switching tube connect the first photo-sensor the 4th pin, also by the 14 resistance ground connection; The grounded emitter of the 3rd switching tube, the collector electrode of the 3rd switching tube connects the A pin of single channel reverser, also connect VDD_IR by the 15 resistance powers end; The Y pin of described single channel reverser connects the P0.10 end of MCU chip by the 20 resistance, and the VCC pin of single channel reverser connects VDD_IR and powers end, the GND pin ground connection of single channel reverser; The base stage of described 4th switching tube connect the 2nd photo-sensor the 4th pin, also by the 16 resistance ground connection; The grounded emitter of the 4th switching tube, the collector electrode of the 4th switching tube connects the 1A pin of two-way reverser, also connect VDD_IR by the 17 resistance powers end; The base stage of described 5th switching tube connect the 3rd photo-sensor the 4th pin, also by the 18 resistance ground connection; The grounded emitter of the 5th switching tube, the collector electrode of the 5th switching tube connects the 2A pin of two-way reverser, also connect VDD_IR by the 19 resistance powers end; The 1Y pin of described two-way reverser connects the P0.11 end of MCU, the 2Y pin of two-way reverser by the P0.12 end of the 22 resistance connection MCU by the 21 resistance, the VCC pin of two-way reverser connects VDD_IR and powers end, the GND pin ground connection of two-way reverser; One end of described 16 electric capacity connects VDD_IR and powers end, the other end ground connection of the 16 electric capacity, and one end connection VDD_IR of described 17 electric capacity powers end, the other end ground connection of the 17 electric capacity;

Described 2nd reception unit comprises the 23 resistance, the 24 resistance, the 25 resistance, the 18 electric capacity, the 19 electric capacity and the 20 electric capacity; One end of described 23 resistance connects the 2nd transmitting unit, one end of the 20 electric capacity and the P0.03/AIN4 of MCU chip, the other end ground connection of the 23 resistance, one end of 24 resistance connects the 2nd transmitting unit, one end of the 19 electric capacity and the P0.04/AIN5 of MCU chip, the other end ground connection of the 24 resistance, one end of 25 resistance connects the 2nd transmitting unit, one end of the 18 electric capacity and the P0.05/AIN5 of MCU chip, the other end ground connection of the 25 resistance; The equal ground connection of the other end of described 18 electric capacity, the 19 electric capacity, the 20 electric capacity.

A kind of Intelligent measuring tape, it comprises Intelligent measuring tape circuit as above.

Compared to prior art, the Intelligent measuring tape that the utility model provides and Intelligent measuring tape circuit, pcb board is provided with clock module, bluetooth module, key-press module, display module, infrared emission module, infrared receiving module, code-disc circuit and MCU control module, the accurate time is provided by clock module, bluetooth module receives the data of peripheral equipment, and show by display module, when measuring, the brush of Intelligent measuring tape rotates and the conducting block of each code-disc circuit draws low yield raw negative edge down trigger MCU control module successively, when MCU control module detects negative edge signal, output switching signal wakes infrared transceiver module up, when tape measure band pulls out, code-disc circuit exports look-at-me to MCU control module, MCU control module just wakes infrared transceiver module work up, infrared transceiver module is without the need to keeping working order in real time, save power consumption, decrease the power consumption of Intelligent measuring tape, thus avoid frequently changing battery, save the cost of battery. in addition, measurement pattern can also be switched by key-press module, can adapt to the measurement of different occasion, intelligence degree height.

Accompanying drawing explanation

Fig. 1 is the structure block diagram of the utility model Intelligent measuring tape circuit.

Fig. 2 is the schematic circuit of MCU control module, clock module, bluetooth module and key-press module in the utility model Intelligent measuring tape circuit.

Fig. 3 is the structure block diagram of infrared facility in the utility model Intelligent measuring tape circuit.

Figure, 4 is the schematic circuit of the first transmitting unit in the utility model Intelligent measuring tape circuit.

Fig. 5 is the schematic circuit of the 2nd transmitting unit in the utility model Intelligent measuring tape circuit.

Fig. 6 is the schematic circuit of the first reception unit in the utility model Intelligent measuring tape circuit.

Fig. 7 is the schematic circuit of the 2nd reception unit in the utility model Intelligent measuring tape circuit.

Fig. 8 is the schematic diagram of code-disc circuit and pcb board in the utility model Intelligent measuring tape circuit.

Fig. 9 is the structure iron of code-disc circuit in the utility model Intelligent measuring tape circuit.

Figure 10 is the schematic circuit of code-disc circuit in the utility model Intelligent measuring tape circuit.

Figure 11 is the schematic circuit of display module in the utility model Intelligent measuring tape circuit.

Figure 12 is the schematic circuit of module of powering in the utility model Intelligent measuring tape circuit.

Embodiment

The utility model provides Intelligent measuring tape and Intelligent measuring tape circuit, for making the purpose of this utility model, technical scheme and effect clearly, clearly, is further described by the utility model referring to the accompanying drawing embodiment that develops simultaneously. It is to be understood that specific embodiment described herein is only in order to explain the utility model, and it is not used in restriction the utility model.

Referring to Fig. 1, the Intelligent measuring tape that the utility model provides comprises: MCU control module 10, clock module 20, bluetooth module 30, key-press module 40, display module 50, infrared emission module 60, infrared receiving module 70 and code-disc circuit 90. Described clock module 20, bluetooth module 30, key-press module 40, display module 50, infrared emission module 60, infrared receiving module 70 and code-disc circuit 90 all connect MCU control module 10, and infrared emission module 60 connects infrared receiving module 70.

Wherein, MCU control module for controlling the working order of the hardware circuit of Intelligent measuring tape, clock module 20 for providing clocksignal, bluetooth module 30 for receiving wireless messages, such as weight data, height data etc. Key-press module 40 for switching the measurement pattern of Intelligent measuring tape, such as standard pattern, waistline measurement pattern etc. Described display module 50 is for display measurement data, infrared emission module 60 for continuing to send the Gray code of Infrared irradiation tape measure band according to switch signal within the default time, and the reflected light according to Gray code generates corresponding electric current signal, infrared receiving module 70 trembles anti-interference process for converting described electric current signal to voltage signal and carry out disappearing, described MCU control module 10, for controlling the working order of the hardware circuit of Intelligent measuring tape, namely controls the overall function of Intelligent measuring tape.

In the Intelligent measuring tape circuit that the utility model provides, when measuring pull-out code band, the brush of Intelligent measuring tape rotates and the conducting block of each code-disc circuit draws low yield raw negative edge down trigger MCU control module 10 successively, and when MCU control module 10 detects negative edge signal, output switching signal wakes infrared transceiver module 60 up; When tape measure band pulls out, code-disc circuit exports look-at-me to MCU control module 10, MCU control module 10 is just waken infrared transceiver module 60 up and is worked, infrared transceiver module 60 is without the need to keeping working order in real time, save power consumption, decrease the power consumption of Intelligent measuring tape, thus avoid frequently changing battery, save the cost of battery. In addition, measurement pattern can also be switched by key-press module, can adapt to the measurement of different occasion, intelligence degree height.

See also Fig. 2, described MCU control module 10 comprises MCU chip U1, first electric capacity C1, 2nd electric capacity C2, 3rd electric capacity C3 and crystal oscillator Y1, the P0.27/AIN1/XL1 end of described MCU chip U1, P0.28 end and P0.29 end connect clock module 20, the DEC1 end of described MCU chip U1 is by the first electric capacity C1 ground connection, the XC2 end of described MCU chip U1 connects the 3rd end of crystal oscillator Y1, also by the 2nd electric capacity C2 ground connection, the XC1 end of described MCU chip U1 connects the 1st end of crystal oscillator Y1, also by the 3rd electric capacity C3 ground connection, 2nd end of described crystal oscillator Y1 and the 4th equal ground connection of end.

Wherein, described MCU chip U1 employing model is the MCU of NRF51822_QFAA super low-power consumption, the functions such as data processing data is fast, expansion interface is many, stable performance, sleep, interruption is waken up, power consumption is ultralow that it has. The model of described crystal oscillator Y1 is FA-238, its together with clock module 20 for MCU chip U1 provides clock accurately, it is ensured that the operation that MCU chip U1 can be reliable, stable.

Described MCU control module 10 also comprises the first inductance L 1, the 2nd inductance L 2, the 4th electric capacity C4 and the 5th electric capacity C5, the DCC end of described MCU chip U1 connects A+3V3 and one end of the 5th electric capacity C5 successively by the first inductance L 1 and the 2nd inductance L 2, the other end ground connection of described 5th electric capacity C5, the vdd terminal of described MCU chip U1 connect VDD_BT power end, also by the 4th electric capacity C4 ground connection. Described first inductance L 1, the 2nd inductance L 2, the 4th electric capacity C4 and the 5th electric capacity C5 mainly play filtering effect, for MCU chip U1 provides stable operating voltage.

Please continue to refer to Fig. 2, described MCU control module 10 also comprises the 6th electric capacity C6 and the 7th electric capacity C7, and the DEC2 end of described MCU chip U1 is by the 6th electric capacity C6 ground connection, and the AVDD end of MCU chip U1 connects A+3V3, also by the 7th electric capacity C7 ground connection. 6th electric capacity C6 and the 7th electric capacity C7 mainly plays filtering effect, makes MCU chip U1 working stability.

Described bluetooth module 30 comprises by the 8th electric capacity C8, 9th electric capacity C9, tenth electric capacity C10, 11 electric capacity C11, 3rd inductance L 3, 4th inductance L 4, 5th inductance L 5 and antenna ANT1, the ANT2 end of described MCU chip U1 connects one end of the 3rd inductance L 3 and one end of the 8th electric capacity C8, the other end of described 3rd inductance L 3 connects the ANT1 end of MCU chip U1 and one end of the 4th inductance L 4, the other end of described 4th inductance L 4 connects the VDD_PA end of MCU chip U1, also by the 9th electric capacity C9 ground connection, the other end of described 8th electric capacity C8 is by the 5th inductance L 5 ground connection, one end of antenna ANT1 and the 11 electric capacity C11 is also connected by the tenth electric capacity C10, the other end ground connection of described 11 electric capacity C11.

Described 8th electric capacity C8, the 9th electric capacity C9, the tenth electric capacity C10, the 11 electric capacity C11, the 3rd inductance L 3, the 4th inductance L 4, the 5th inductance L 5, for the radiofrequency signal of transmitting-receiving being carried out filtering, chokes process, make radiofrequency signal transmitting-receiving noiseless, it is thus possible to enable accessible the communicating with external smart equipment (such as smart mobile phone, panel computer etc.) of Intelligent measuring tape, receive the blue-teeth data that external smart equipment transmits, such as weight data, height data.

Please continue to refer to Fig. 1 and Fig. 2, in pilot circuit of the present utility model, described clock module 20 comprises clock chip U2, the first resistance R1, the 2nd resistance R2 and the 12 electric capacity C12. Described clock chip U2 /IRQ end connects the P0.27/AIN1/XL1 end of MCU chip U1, also connects one end of the 12 electric capacity C12 by the first resistance R1 and VDD_BT powers end, the other end ground connection of described 12 electric capacity C12, described clock chip U2 /IRT end connects VDD_BT by the 2nd resistance R2 and powers end, the SCL end of described clock chip U2 connects the P0.28 end of MCU chip U1, and the SDA end of clock chip U2 connects the P0.29 end of MCU chip U1.

The model of described clock chip U2 is RX8130CE, for MCU chip U1 provides accurate clocksignal together with crystal oscillator Y1, enables MCU chip U1 stablize passable work. Miniature MCU and crystal is established in RX8130CE clock chip, make clock chip need not with MCU chip real-time Communication for Power, when MCU chip is slept, the power consumption of MCU chip is UA level power consumption, and now the miniature MCU of RX8130CE clock chip and crystal carry out work, thus control module overall power is reduced.

Please continue to refer to Fig. 1 and Fig. 2, in pilot circuit of the present utility model, described key-press module 40 comprises the first button KW1, the 2nd button KW2, the 3rd button KW3, the 4th button KW4, the 3rd resistance R3, the 4th resistance R4, the 5th resistance R5 and the 6th resistance R6, one end of described 3rd resistance R3 connects the P0.00/AREF0 end of MCU chip U1, and the other end of the 3rd resistance R3 is by the first button KW1 ground connection; One end of described 4th resistance R4 connects the P0.30 end of MCU chip U1, and the other end of the 4th resistance R4 is by the 2nd button KW2 ground connection; One end of described 5th resistance R5 connects the P0.20 end of MCU chip U1, and the other end of the 5th resistance R5 is by the 3rd button KW3 ground connection; One end of described 6th resistance R6 connects the P0.19 end of MCU chip U1, and the other end of the 6th resistance R6 is by the 4th button KW4 ground connection.

In the present embodiment, described 3rd resistance R3, the 4th resistance R4, the 5th resistance R5 and the 6th resistance R6 are the lower pull-up resistor of 10 ohm, and when can guarantee that keyswitch is closed or disconnects, signal is reliable and stable.

Further, key-press module 40 goes back tape measure band detection interface J1, when button be chosen as enclose long measurement pattern (as surveyed chest measurement, survey waistline etc.) time, tape measure band detection interface J1 can detect whether tape measure band inserts in this interface, this tape measure band insertion tape measure band detection interface J1 exports lower level, and feedback signal is to MCU chip U1, calculates by MCU chip U1 and enclose length accordingly.

When specifically implementing, the tape measure band of Intelligent measuring tape adopts the belt being provided with two look Gray codes black, white. Tape measure band is provided with Gray code on its two sides, and complete take off data is determined by the Gray code value on two sides. The Gray code of tape measure band one side is as low 3 bit data, and another side is as high 3 bit data. Tape measure band two sides all need to be carried out Infrared irradiation. When user pulls tape measure band to measure, the code-disc of tape measure band produces look-at-me (pulse waveform) and triggers interruption to MCU. When MCU detects the negative edge of look-at-me, export the first switch signal to the measurement of infrared emission module 60 to carry out high 3. When MCU detects when code-disc sends without look-at-me (represent user stopping pull tape measure band) more than 200 milliseconds, then export the 2nd switch signal to the measurement of infrared emission module 60 to carry out low 3. Described infrared emission module 60 continues to send Infrared irradiation on the Gray code of tape measure band within the default time (such as 100 microseconds) according to switch signal. Based on black-and-white two color, the degree of absorption of infrared light is different, reflected light size is not identical yet. Infrared emission module 60 generates corresponding electric current signal according to the size of reflected light. Infrared receiving module 70 converts described electric current signal to voltage signal and carries out disappearing trembling after anti-interference processes exports to MCU. MCU carries out integration processing by high 3 with low 3 corresponding two group voltage signals can obtain complete measuring result.

See also Fig. 3, in the Intelligent measuring tape circuit that the utility model provides, described infrared emission module comprises: for receiving the first switch signal, continue to send first group of Infrared irradiation Gray code within the default time according to the first switch signal, and generate the first transmitting unit of first group of electric current signal corresponding to high 3 take off data according to reflected light; And for receiving the 2nd switch signal, continue within the default time according to the 2nd switch signal to send the 2nd group of Infrared irradiation Gray code, and generate the 2nd transmitting unit of the 2nd group of electric current signal corresponding to low 3 take off data according to reflected light; Described first transmitting unit, the 2nd transmitting unit connect infrared receiving module and MCU chip.

Described infrared receiving module is corresponding to be comprised: for receiving described first group of electric current signal and convert first group of voltage signal to, first group of voltage signal is disappeared tremble anti-interference process export to MCU chip first reception unit; And for receiving the 2nd group of electric current signal and convert the 2nd group of voltage signal to, the 2nd group of voltage signal is disappeared and trembles the 2nd reception unit that MCU is exported in anti-interference process; Described first reception unit connects the first transmitting unit and MCU chip, and the 2nd reception unit connects the 2nd transmitting unit and MCU chip.

By MCU chip U, two groups of voltage signals are carried out integration processing and can obtain measuring result. The present embodiment just wakes infrared emission up when tape measure band is drawn out and measures, receiver module is measured, and infrared emission, receiver module, without the need to keeping working order in real time, save power consumption, decrease infrared receiving/transmission power consumption. Adopt infrared mode can measure again when user uses, save infrared receiving/transmission power consumption; And the impact whether infrared receiving/transmission does not bend by extraneous factor, tape measure band, stability is higher, it is ensured that the accuracy measured.

Please continue to refer to Fig. 4, described first transmitting unit comprises the first switching tube Q1, the 2nd switching tube Q2, the 7th resistance R7, the 8th resistance R8, the 9th resistance R9, the first photo-sensor U3, the 2nd photo-sensor U4, the 3rd photo-sensor U5, the 13 electric capacity C13, the 14 electric capacity C14, the 15 electric capacity C15, the tenth resistance R10, the 11 resistance R11, the 12 resistance R12 and the 13 resistance R13; The P0.09 end that the grid of described first switching tube Q1 connects the P0.08 end of MCU chip, the grid of the 2nd switching tube Q2 connects MCU chip, the drain electrode of the first switching tube Q1 connects the 1st pin of the first photo-sensor U3 by the 7th resistance R7,2nd pin of the first photo-sensor U3 connects the 3rd pin of the first photo-sensor U3 and VDD_IR powers end, the 4th pin of the first photo-sensor U3 connects the first reception unit; The drain electrode of described 2nd switching tube Q2 is connected the 1st pin of the 2nd photo-sensor U4 by the 8th resistance R8, is also connected the 1st pin of the 3rd photo-sensor U5 by the 9th resistance R9,2nd pin of the 2nd photo-sensor U4 connects the 3rd pin of the 2nd photo-sensor U4 and VDD_IR powers end, 4th pin of the 2nd photo-sensor U4 connects the first reception unit, 2nd pin of the 3rd photo-sensor U5 connects the 3rd pin of the 3rd photo-sensor U5 and VDD_IR powers end, the 4th pin of the 3rd photo-sensor U5 connects first and receives unit; The grid of described first switching tube Q1 is by the tenth resistance R10 ground connection, the P0.08 end also being connected MCU chip by the 11 resistance R11, the grid of the 2nd switching tube Q2 is by the 12 resistance R12 ground connection, the P0.09 end also being connected MCU chip by the 13 resistance R13,13 electric capacity C13 is connected on the 2nd between pin and ground of the first photo-sensor U3,14 electric capacity C14 is connected on the 2nd between pin and ground of the 2nd photo-sensor U4, and the 15 electric capacity C15 is connected on the 2nd between pin and ground of the 3rd photo-sensor U5.

Wherein, described first switching tube Q1, the 2nd switch Q2 are NMOSFET pipe. The model of described first photo-sensor U3 and the 2nd photo-sensor U4 is ITR8307, and it is the photo-sensor of reflection-type, also that is to say, in photo-sensor, infrared lamp is luminous, and photosensitive triode comes conducting or cut-off according to the power of external reflection light. Being provided with isolation structure between infrared lamp and photosensitive triode, the light of infrared lamp can not shine on photosensitive triode, also would not affect the break-make of photosensitive triode. The first switch signal (IR_LED_CTRL4, IR_LED_CTRL56, high level is effective) that MCU exports controls the first switching tube Q1, the 2nd switch Q2 conducting. In first photo-sensor U3 and the 2nd photo-sensor U4, infrared lamp luminescence is radiated on the Gray code of tape measure band. The reflected light of Gray code controls photosensitive triode ON in the first photo-sensor U3 and the 2nd photo-sensor U4, and photosensitive triode exports first group of electric current signal (IR_SIG4, IR_SIG5, IR_SIG6 represent the take off data of high 3).

The high level of the first switch signal can control the first photo-sensor U3 and the 2nd photo-sensor U4 and continue the luminous default time (such as 100 microseconds), the stability of the reception of reflected light can be guaranteed like this, avoid Lou gathering take off data, to improve the accuracy of measurement.

Tenth resistance R10, the 11 resistance R11 can protect the first switching tube Q1, avoid the too high scaling loss of grid voltage; 12 resistance R12, the 13 resistance R13 protect the 2nd switching tube Q2. 13 electric capacity C13, the 14 electric capacity C14, the 15 electric capacity C15 are filter capacitor, and the power supply of infrared lamp in photo-sensor can be made more stable, then the infrared light launched is more stable.

The circuit structure of the 2nd transmitting unit is identical with the first transmitting unit with principle of work, and the switch signal only inputted is different with the electric current signal of output. 2nd switch signal of the 2nd transmitting unit is IR_LED_CTRL1, IR_LED_CTRL23, and the 2nd group of electric current signal of output is IR_SIG1, IR_SIG2, IR_SIG3, represents the take off data of low 3. As shown in Figure 5, this is not repeated herein.

Seeing also Fig. 6, described first reception unit comprises single channel reverser S1, two-way reverser S2, the 3rd switching tube Q3, the 4th switching tube Q4, the 5th switching tube Q5, the 14 resistance R14, the 15 resistance R15, the 16 resistance R16, the 17 resistance R17, the 18 resistance R18, the 19 resistance R19, the 16 electric capacity C16, the 17 electric capacity C17, the 20 resistance R20, the 21 resistance R21 and the 22 resistance R22.

The base stage of described 3rd switching tube Q3 connect the first photo-sensor the 4th pin, also by the 14 resistance R14 ground connection; The grounded emitter of the 3rd switching tube Q3, the collector electrode of the 3rd switching tube Q3 connects the A pin of single channel reverser S1, also connect VDD_IR by the 15 resistance R15 powers end; The Y pin of described single channel reverser S1 connects the P0.10 end of MCU chip by the 20 resistance R20, and the VCC pin of single channel reverser S1 connects VDD_IR and powers end, the GND pin ground connection of single channel reverser S1; The base stage of described 4th switching tube Q4 connect the 2nd photo-sensor the 4th pin, also by the 16 resistance R16 ground connection; The grounded emitter of the 4th switching tube Q4, the collector electrode of the 4th switching tube Q4 connects the 1A pin of two-way reverser S2, also connect VDD_IR by the 17 resistance R17 powers end; The base stage of described 5th switching tube Q5 connect the 3rd photo-sensor the 4th pin, also by the 18 resistance R18 ground connection; The grounded emitter of the 5th switching tube Q5, the collector electrode of the 5th switching tube Q5 connects the 2A pin of two-way reverser S2, also connect VDD_IR by the 19 resistance R19 powers end; The 1Y pin of described two-way reverser S2 connects the P0.11 end of MCU, the 2Y pin of two-way reverser S2 by the P0.12 end of the 22 resistance R22 connection MCU by the 21 resistance R21, the VCC pin of two-way reverser S2 connects VDD_IR and powers end, the GND pin ground connection of two-way reverser; One end of described 16 electric capacity C16 connects VDD_IR and powers end, the other end ground connection of the 16 electric capacity C16, and one end connection VDD_IR of described 17 electric capacity C17 powers end, the other end ground connection of the 17 electric capacity C17.

Wherein, described single channel reverser S1 is single channel schmidt trigger reverser, and model is SN74LVC1G14DRL. Two-way reverser S2 is two-way schmidt trigger reverser, and model is SN74LVC2G14DCKR. 3rd switching tube Q3, the 4th switching tube Q4, the 5th switching tube Q5 are NPN triode. First group of electric current signal (IR_SIG4, IR_SIG5, IR_SIG6) input converts voltage signal to, controls the break-make of corresponding switching tube. Based on the black region of Infrared irradiation at Gray code, reflected light is few, then voltage signal is lower than the threshold voltage of switching tube, switching tube disconnects, pull-up high-voltage is to corresponding schmidt trigger reverser, mainly carry out eliminating shaking interference, after built-in inverter, exporting low level first group of voltage signal (IR_CAL4, IR_CAL5, IR_CAL6) to MCU. Infrared irradiation is at the white portion of Gray code, reflected light is many, then voltage signal is higher than the threshold voltage of switching tube, switching tube conducting, export low voltage to corresponding schmidt trigger reverser, through inverter after elimination shaking interference, IR_CAL4, IR_CAL5, IR_CAL6 of exporting high level are to MCU.

Please continue to refer to Fig. 7, described 2nd reception unit comprises the 23 resistance R23, the 24 resistance R24, the 25 resistance R25, the 18 electric capacity C18, the 19 electric capacity C19 and the 20 electric capacity C20; One end of described 23 resistance R23 connects the 2nd transmitting unit, one end of the 20 electric capacity and the P0.03/AIN4 of MCU chip, the other end ground connection of the 23 resistance R23, one end of 24 resistance R24 connects the 2nd transmitting unit, one end of the 19 electric capacity C19 and the P0.04/AIN5 of MCU chip, the other end ground connection of the 24 resistance R24, one end of 25 resistance R25 connects the 2nd transmitting unit, one end of the 18 electric capacity C18 and the P0.05/AIN5 of MCU chip, the other end ground connection of the 25 resistance 25; The equal ground connection of the other end of described 18 electric capacity C18, the 19 electric capacity C19, the 20 electric capacity C20.

2nd group of electric current signal (IR_SIG1, IR_SIG2, IR_SIG3) converts the 2nd group of voltage signal (IR_AIN1, IR_AIN2, IR_AIN3) to respectively through after the 23 resistance R23, the 24 resistance R24, the 25 resistance R25; Again through corresponding electric capacity filtering. MCU gathers low three infrared magnitudes of voltage respectively; Inner according to pre-set threshold value at MCU, the signal that judgement receives is high (in vain) is low (black), can identify measuring result.

See also Fig. 1, Fig. 2, Fig. 8 and Fig. 9, code-disc circuit 90 is provided with conducting block 101 and Pu Tong district 102 that some are lined up a circle. Xth conducting block is connected the output pin for code-disc circuit 90 with xth+n conducting block of arranged in sequence by wire, and each output pin all connects MCU chip U1, and the signal that all output pins export forms a look-at-me and is transferred to MCU chip U1. Being provided with isolated area between adjacent conductive block 101, the width of isolated area is L, can avoid influencing each other between conducting block. Wherein, x, n are positive integer, and x is from 1, and n is preset value, and the value of n is relevant with the pin number of MCU chip.

The above-mentioned tape measure band having mentioned Intelligent measuring tape adopts the belt being provided with two look Gray codes black, white. Tape measure band is provided with Gray code on its two sides, and complete take off data is determined by the Gray code value on two sides. The Gray code of tape measure band one side is as low 3 bit data, and another side is as high 3 bit data. Tape measure band two sides all need to be carried out Infrared irradiation. When user pulls tape measure band to measure, tape measure band rotates and drives brush to rotate, and code-disc maintains static. Pulled up as high level by MCU chip U1 when conducting block 101 is flat. Brush contacts successively with the conducting block 101 in code-disc circuit 90 when rotating. The conducting block of correspondence is drawn low thus produce negative edge down trigger MCU chip. When MCU chip detects negative edge signal, export the first switch signal and wake the measurement of infrared transceiver module to carry out high 3 up.

(represent that user stops pulling tape measure band when MCU chip detects when code-disc circuit 90 exports without negative edge more than 200 milliseconds, now brush may contact with conducting block 101 or isolated area, now (contact with conducting block without negative edge signal, it is continuously low level signal, contact with isolated area and remain high level after producing positive rise), MCU chip only detects that negative edge signal is just triggered, and exports the 2nd switch signal to the measurement of infrared transceiver module to carry out low 3. High 3 and low 3 corresponding two group voltage signals that infrared transceiver module is fed back by MCU chip carry out integration processing and can obtain complete measuring result.

Seeing also Figure 10, in further embodiment, x is preferably 76, n and is preferably 4. Then code-disc circuit 90 comprises 80 conducting blocks, 101,80 conducting blocks and lines up a circle and be designated as the 1st conducting block ~ the 80th conducting block according to the order of sequence, specifically as shown in Figure 3. In Fig. 4, each pin (1 ~ 80) represents a conducting block, then the 1st, 5,9,13,17,21,25,29,33,37,41,45,49,53,57,61,65,69,73,77 conducting blocks link together the first output pin as code-disc circuit 90, export the first signal ENCODER_IN1 to the P0.25 end of MCU chip.

2nd, 6,10,14,18,22,26,30,34,38,42,46,50,54,58,62,66,70,74,78 conducting blocks link together the 2nd output pin as code-disc circuit 90, export second signal ENCODER_IN2 to the P0.23 end of MCU chip.

3rd, 7,11,15,19,23,27,31,35,39,43,47,51,55,59,63,67,71,75,79 conducting blocks link together the 3rd output pin as code-disc circuit 90, export the 3rd signal ENCODER_IN3 to the P0.24 end of MCU.

4th, 8,12,16,20,24,28,32,36,40,44,48,52,56,60,64,68,72,76,80 conducting blocks link together the 4th output pin as code-disc circuit 90, export the 4th signal ENCODER_IN4 to the P0.22 end of MCU.

Described first signal ENCODER_IN1, second signal ENCODER_IN2, the 3rd signal ENCODER_IN3, the 4th signal ENCODER_IN4 are combined into the corresponding port place that a look-at-me is transferred to MCU chip. These four output pins are high level by MCU pull-up at ordinary times, such as 1111. When brush contacts with certain conducting block, drawn low, produced negative edge signal. Such as the 1st conducting block and brush contact, look-at-me is 1110. Being drawn out along with tape measure band drives brush to rotate, and brush contacts with the 2nd conducting block fast, then look-at-me turns into 1101. When brush contacts with the 5th conducting block, owing to the 5th conducting block is connected with the 1st conducting block, look-at-me is 1110. Analogizing with this, brush rotates and contacts successively with each conducting block, thus constantly produces negative edge signal and trigger MCU. When tape measure band pulls out, code-disc circuit just can export look-at-me to MCU like this, just wakes infrared transceiver module work up by MCU, and infrared transceiver module, without the need to keeping working order in real time, saves power consumption, decreases the power consumption of Intelligent measuring tape. The pin that the setting of above-mentioned conducting block number and method of attachment can save MCU uses, and can not occupy the area of pcb board too much.

In further embodiment, described code-disc circuit 90 also comprises the 26 resistance R26, the 27 resistance R27, the 28 resistance R28, the 29 resistance R29 and the 30 resistance R30; Described 26 resistance R26 is connected between the 1st conducting block and the first output pin of code-disc circuit 90,27 resistance R27 is connected between the 2nd conducting block and the 2nd output pin of code-disc circuit 90,28 resistance R28 is connected between the 3rd conducting block and the 3rd output pin of code-disc circuit 90,29 resistance R29 is connected between the 4th conducting block and the 4th output pin of code-disc circuit 90, the 80th pin in Pu Tong district 102(and Fig. 4) by the 30 resistance R30 ground connection. Wherein, described 26 resistance R26, the 27 resistance R27, the 28 resistance R28, the 29 resistance R29 and the 30 resistance R30 are 0 ohmic resistance.

Owing to the P0.08 pin of MCU chip U1, P0.09, P0.07 pin, P0.06/AIN7/AREF1 pin all connect infrared transceiver module. Wherein, P0.08 pin exports, P0.09 pin exports the first switch signal (IR_LED_CTRL4, IR_LED_CTRL56) and controls infrared transceiver module and carry out infrared emission, to carry out the measurement of high 3. . P0.07 pin, P0.06/AIN7/AREF1 pin control infrared transceiver module carry out infrared emission for exporting the 2nd switch signal (IR_LED_CTRL1, IR_LED_CTRL23), to carry out the measurement of low 3. High 3 and low 3 corresponding two group voltage signals that infrared transceiver module is fed back by MCU chip U1 carry out integration processing and can obtain complete measuring result.

Referring to Fig. 2 and Figure 11, in the Intelligent measuring tape circuit of this practicality, described display module comprises display screen (not shown) and is electrically connected driving chip U6, driving chip for driving display screen to show with display screen. The model of described driving chip is BU9795AFV, the vdd terminal of driving chip connects VCC_LCD and powers end, the SDA end of described driving chip connects the P0.14 end of MCU chip, the SCL end of described driving chip connects the P0.15 end of MCU chip, the CSB end of described driving chip connects the P0.16 end of MCU chip, the INHB end of described driving chip connects the P0.13 end of MCU chip, and the SEG4-SEG28 end of driving chip connects display screen. After MCU chip calculates take off data, control driving chip drives display screen to show corresponding data.

Seeing also Fig. 1, Fig. 2 and Figure 12, Intelligent measuring tape circuit of the present utility model also comprises power supply module, for powering to each several part circuit of Intelligent measuring tape. Concrete, described power supply module comprises battery module 901, carries out the pressure unit 904 of lowering and stabilizing blood pressure process for detecting the detecting unit 902 of described battery module 901 electricity, filter unit 903 and the voltage for battery module 901 being exported, the output terminal of described battery module 901 connects described filter unit 903 by described detecting unit 902, and described filter unit 903 is powered to external circuit by described pressure unit 904. Wherein, described external circuit comprises LCD circuit, key circuit and MCU control circuit etc. The feed circuit of the Intelligent measuring tape that the utility model provides, by battery module 901, make Intelligent measuring tape break away from the dependence of Liao Dui city electricity, detected the electricity of battery module 901 by detecting unit 902, it is convenient to user and grasps battery electricity, change battery when battery electricity is not enough. By the electrical signal that battery module 901 exports is carried out filtering, step-down and voltage stabilizing, it is ensured that for external circuit provides stable, a glitch-free power supply, effectively protect external circuit.

Wherein, described battery module 901 comprises the first battery (not shown), the 2nd battery (not shown), cathode contact BAT+, ground connection contact BAT-and the first diode D1, described first battery and the 2nd serial battery connect, namely, the positive pole of described 2nd battery connects the negative pole of the first battery, the positive pole of described first battery connects cathode contact BAT+, and the negative pole of described 2nd battery connects ground connection contact BAT-, described ground connection contact BAT-ground connection; Described cathode contact BAT+ connects the positive pole of the first diode D1, and the negative pole of described first diode D1 is the output terminal of battery module 901, connects described detecting unit 902. By adopting two serial battery, it is to increase the stability that cell container and battery circuit export. Preferably, described first battery and the 2nd battery are button cell, certainly, it is also possible to being rechargeable lithium battary or solar cell, the utility model is not construed as limiting.

Please continue to refer to Figure 12, described detecting unit 902 comprises the 31 resistance R31, the 32 resistance R32 and the 21 electric capacity C21, the output terminal of described battery module 901 connects one end of the 32 resistance R32 and one end of the 21 electric capacity C21 by the 31 resistance R31, one end of described 32 resistance R32 connects the detection signal output terminal BAT_DET of described detecting unit 902, the described the other end of the 32 resistance R32 and the other end ground connection of the 21 electric capacity C21. Described 31 resistance R31 and the 32 resistance R32 is a point compressive resistance, after the voltage dividing potential drop that battery module 901 is exported by described 31 resistance R31 and the 32 resistance R32, export from the detection signal output terminal BAT_DET being connected with one end of the 32 resistance R32, therefore only need to detect the voltage that signal output terminal BAT_DET exports, the electricity of battery module 901 can be judged, moment reminds the information of user's battery electricity, facilitates user to change battery in time. For ease of the voltage that detection detection signal output terminal BAT_DET exports, the resistance of described 31 resistance R31 is five times of described 32 resistance R32 resistance, the resistance of described 31 resistance R31 is 2M Europe, and the resistance of described 32 resistance R32 is 400K Europe.

Described filter unit 903 comprises the 22 electric capacity C22, one end of described 22 electric capacity C22 connects the output terminal of battery module 901, one end of described 22 electric capacity C22 specifically connects the negative pole of the first diode D1, the other end ground connection of described 22 electric capacity C22. Described 22 electric capacity C22 plays the effect of filtering, to protect rear section circuit.

Please continue to refer to Figure 12, described pressure unit 904 comprises step-down controller U7, the 6th inductance L the 6, the 33 resistance R33, the 34 resistance R34, the 35 resistance R35, the 36 resistance R36, the 37 resistance R37, the 38 resistance R38, the 39 resistance R39, the 40 resistance R40, the 41 resistance R41, the 42 resistance R42, the 43 resistance R43, the 44 resistance R44, the 45 resistance R45, the 46 resistance R46, the 23 electric capacity C23 and the 24 electric capacity C24, the output terminal of described battery module 901 connects the VIN end of described step-down controller U7, EN end, one end of the 33 resistance R33, one end of the 34 resistance R34, one end of the 35 resistance R35 and one end of the 36 resistance R36, and the VIN end of described step-down controller U7 also connects power supply control end VBAT, the other end of described 33 resistance R33 connect step-down controller U7 VSEL1 end, also by the 37 resistance R37 ground connection, the other end of described 34 resistance R34 connect step-down controller U7 VSEL2 end, also by the 38 resistance R38 ground connection, the other end of described 35 resistance R35 connect step-down controller U7 VSEL3 end, also by the 39 resistance R39 ground connection, the other end of described 36 resistance R36 connect step-down controller U7 VSEL4 end, also by the 40 resistance R40 ground connection, the GND end ground connection of described step-down controller U7, the SW end of described step-down controller U7 connects one end of the 6th inductance L 6, the other end of described 6th inductance L 6 connects the VOUT end of step-down controller U7, one end of 41 resistance R41, one end of 42 resistance R42, one end of 43 resistance R43 and one end of the 44 resistance R44, also by the 23 electric capacity C23 ground connection, the other end of described 42 resistance R42, the other end of the 43 resistance R43 and the other end of the 44 resistance R44 are the output terminal of pressure unit 904, connect external circuit, the PG end of described step-down controller U7 connects the other end of the 41 resistance R41, the CTRL end of described step-down controller U7 connects external control signal input terminus VIR_CTRL, also by the 45 resistance R45 ground connection, the LOAD end of described step-down controller U7 connects external circuit by the 46 resistance R46, also by the 24 electric capacity C24 ground connection. the other end of described 42 resistance R42, the other end of the 43 resistance R43, the other end of the 44 resistance R44 and the other end of the 46 resistance R46 are respectively the first output terminal VDD_BT of described pressure unit 904, the 2nd output terminal VDD_LCD, the 3rd output terminal RFR_PWR and the 4th output terminal VDD_IR, described pressure unit 904 by these four output terminals at least four module for power supply of external circuit. the voltage that described pressure unit 904 exports is 3.2V. when described 33 resistance R33, the 34 resistance R34, the 35 resistance R35 and the 36 resistance R36 can avoid starting shooting effectively, the transient voltage that battery module 901 exports and electric current are excessive, the described step-down controller U7 of effective protection.

Further, the model of described step-down controller U7 is TPS62740, and its CTRL end connects the P0.21 end of MCU chip, and by described step-down controller U7, the voltage step-down that described battery module 901 exported also is stabilized in 3.2V. When MCU control signal input terminus VIR_CTRL input high level, it is connected on VOUT end in the LOAD end of described step-down controller U7, namely VOUT end is not powered to external circuit by means of only the first output terminal VDD_BT, the 2nd output terminal VDD_LCD and the 3rd output terminal RFR_PWR, is also powered to the external circuit being connected to the 4th output terminal 4VDD_IR by LOAD end. When external control signal input terminus VIR_CTRL input low level, the LOAD end Non voltage output of described step-down controller U7, namely stops the external circuit to being connected to the 4th output terminal 4VDD_IR and powers. Thus, described step-down controller U7 can also control linkage in the working order of the external circuit of the 4th output terminal 4VDD_IR, very convenient.

The utility model is a kind of Intelligent measuring tape of corresponding offer also, comprises pcb board, described pcb board is provided with pilot circuit. Owing to this pilot circuit has been described in detail above, it is not described further herein.

It is understandable that; for those of ordinary skills; can be equal to according to the technical solution of the utility model and practical novel design thereof and replace or change, and all these are changed or replace the protection domain that all should belong to the claim appended by the utility model.

Claims (10)

1. an Intelligent measuring tape circuit, it is characterised in that, comprise pcb board, described pcb board is provided with:

For providing the clock module of clocksignal;

For receiving the bluetooth module of wireless messages;

For switching the key-press module of the measurement pattern of Intelligent measuring tape;

For the display module of display measurement data;

For continuing to send the Gray code of Infrared irradiation tape measure band within the default time according to switch signal, and generate the infrared emission module of corresponding electric current signal according to the reflected light of Gray code;

The infrared receiving module of anti-interference process is trembled for converting described electric current signal to voltage signal and carry out disappearing;

For controlling the MCU control module of the working order of the hardware circuit of Intelligent measuring tape;

Code-disc circuit, described code-disc circuit is provided with Pu Tong district and some the conducting blocks lining up a circle, is provided with isolated area between adjacent conductive block; Xth conducting block is connected the output pin for code-disc circuit with xth+n conducting block of arranged in sequence, and each output pin all connects MCU control module; Brush rotates and each conducting block draws low yield raw negative edge down trigger MCU control module successively, and when MCU control module detects negative edge signal, output switching signal wakes infrared transceiver module up; Wherein, x, n are positive integer;

Described clock module, bluetooth module, key-press module, display module, infrared emission module, infrared receiving module and code-disc circuit all connect MCU control module, infrared emission model calling infrared receiving module.

2. Intelligent measuring tape circuit according to claim 1, it is characterized in that, described MCU control module comprises MCU chip, the first electric capacity, the 2nd electric capacity, the 3rd electric capacity and crystal oscillator, the P0.27/AIN1/XL1 end of described MCU chip, P0.28 end and P0.29 end connect clock module, the DEC1 end of described MCU chip is by the first electric capacity ground connection, the XC2 end of described MCU chip connect crystal oscillator the 3rd end, also by the 2nd electric capacity ground connection, the XC1 end of described MCU chip connect crystal oscillator the 1st end, also by the 3rd electric capacity ground connection, the 2nd end of described crystal oscillator and the 4th equal ground connection of end.

3. Intelligent measuring tape circuit according to claim 2, it is characterized in that, described MCU control module also comprises the first inductance, the 2nd inductance, the 4th electric capacity, the 5th electric capacity, the 6th electric capacity and the 7th electric capacity, the DCC end of described MCU chip connects one end of A+3V3 and the 5th electric capacity successively by the first inductance and the 2nd inductance, the other end ground connection of described 5th electric capacity, the vdd terminal of described MCU chip connect VDD_BT power end, also by the 4th electric capacity ground connection; The DEC2 end of described MCU chip is by the 6th electric capacity ground connection, and the AVDD end of MCU chip connects A+3V3, also by the 7th electric capacity ground connection.

4. Intelligent measuring tape circuit according to claim 2, it is characterized in that, described bluetooth module comprises by the 8th electric capacity, 9th electric capacity, tenth electric capacity, 11 electric capacity, 3rd inductance, 4th inductance, 5th inductance and antenna, the ANT2 end of described MCU chip connects one end of the 3rd inductance and one end of the 8th electric capacity, the other end of described 3rd inductance connects the ANT1 end of MCU chip and one end of the 4th inductance, the other end of described 4th inductance connects the VDD_PA end of MCU chip, also by the 9th electric capacity ground connection, the other end of described 8th electric capacity is by the 5th inductance ground connection, one end of antenna and the 11 electric capacity is also connected by the tenth electric capacity, the other end ground connection of described 11 electric capacity.

5. Intelligent measuring tape circuit according to claim 2, it is characterized in that, described clock module comprises clock chip, first resistance, 2nd resistance and the 12 electric capacity, described clock chip /IRQ end connect MCU chip P0.27/AIN1/XL1 end, also connect one end of the 12 electric capacity by the first resistance and VDD_BT powers end, the other end ground connection of described 12 electric capacity, described clock chip /IRT end connects VDD_BT by the 2nd resistance and powers end, the SCL end of described clock chip connects the P0.28 end of MCU chip, the SDA end of clock chip connects the P0.29 end of MCU chip.

6. Intelligent measuring tape circuit according to claim 2, it is characterized in that, described key-press module comprises the first button, the 2nd button, the 3rd button, the 4th button, the 3rd resistance, the 4th resistance, the 5th resistance and the 6th resistance, one end of described 3rd resistance connects the P0.00/AREF0 end of MCU chip, and the other end of the 3rd resistance is by the first button ground connection; One end of described 4th resistance connects the P0.30 end of MCU chip, and the other end of the 4th resistance is by the 2nd button ground connection; One end of described 5th resistance connects the P0.20 end of MCU chip, and the other end of the 5th resistance is by the 3rd button ground connection; One end of described 6th resistance connects the P0.19 end of MCU chip, and the other end of the 6th resistance is by the 4th button ground connection.

7. Intelligent measuring tape circuit according to claim 2, it is characterized in that, described infrared emission module comprises: for receiving the first switch signal, continue to send first group of Infrared irradiation Gray code within the default time according to the first switch signal, and generate the first transmitting unit of first group of electric current signal corresponding to high 3 take off data according to reflected light;

For receiving the 2nd switch signal, continue according to the 2nd switch signal to send the 2nd group of Infrared irradiation Gray code within the default time, and generate the 2nd transmitting unit of the 2nd group of electric current signal corresponding to low 3 take off data according to reflected light;

Described first transmitting unit, the 2nd transmitting unit connect infrared receiving module and MCU chip;

Described infrared receiving module comprises:

For receiving described first group of electric current signal and convert first group of voltage signal to, first group of voltage signal is disappeared tremble anti-interference process export to MCU chip first reception unit;

For receiving the 2nd group of electric current signal and convert the 2nd group of voltage signal to, the 2nd group of voltage signal is disappeared and trembles the 2nd reception unit that MCU is exported in anti-interference process;

Described first reception unit connects the first transmitting unit and MCU chip, and the 2nd reception unit connects the 2nd transmitting unit and MCU chip.

8. Intelligent measuring tape circuit according to claim 7, it is characterized in that, described first transmitting unit comprises the first switching tube, the 2nd switching tube, the 7th resistance, the 8th resistance, the 9th resistance, the first photo-sensor, the 2nd photo-sensor, the 3rd photo-sensor, the 13 electric capacity, the 14 electric capacity, the 15 electric capacity, the tenth resistance, the 11 resistance, the 12 resistance and the 13 resistance;

The P0.09 end that the grid of described first switching tube connects the P0.08 end of MCU chip, the grid of the 2nd switching tube connects MCU chip, the drain electrode of the first switching tube connects the 1st pin of the first photo-sensor by the 7th resistance, 2nd pin of the first photo-sensor connects the 3rd pin of the first photo-sensor and VDD_IR powers end, the 4th pin of the first photo-sensor connects the first reception unit; The drain electrode of described 2nd switching tube is connected the 1st pin of the 2nd photo-sensor by the 8th resistance, is also connected the 1st pin of the 3rd photo-sensor by the 9th resistance, 2nd pin of the 2nd photo-sensor connects the 3rd pin of the 2nd photo-sensor and VDD_IR powers end, 4th pin of the 2nd photo-sensor connects the first reception unit, 2nd pin of the 3rd photo-sensor connects the 3rd pin of the 3rd photo-sensor and VDD_IR powers end, the 4th pin of the 3rd photo-sensor connects first and receives unit; The grid of described first switching tube is by the tenth resistance ground connection, the P0.08 end also being connected MCU chip by the 11 resistance, the grid of the 2nd switching tube is by the 12 resistance ground connection, the P0.09 end also being connected MCU chip by the 13 resistance, 13 capacitances in series is on the 2nd between pin and ground of the first photo-sensor, 14 capacitances in series is on the 2nd between pin and ground of the 2nd photo-sensor, and the 15 capacitances in series is on the 2nd between pin and ground of the 3rd photo-sensor.

9. Intelligent measuring tape circuit according to claim 8, it is characterized in that, described first reception unit comprises single channel reverser, two-way reverser, the 3rd switching tube, the 4th switching tube, the 5th switching tube, the 14 resistance, the 15 resistance, the 16 resistance, the 17 resistance, the 18 resistance, the 19 resistance, the 16 electric capacity, the 17 electric capacity, the 20 resistance, the 21 resistance and the 22 resistance; The base stage of described 3rd switching tube connect the first photo-sensor the 4th pin, also by the 14 resistance ground connection; The grounded emitter of the 3rd switching tube, the collector electrode of the 3rd switching tube connects the A pin of single channel reverser, also connect VDD_IR by the 15 resistance powers end; The Y pin of described single channel reverser connects the P0.10 end of MCU chip by the 20 resistance, and the VCC pin of single channel reverser connects VDD_IR and powers end, the GND pin ground connection of single channel reverser; The base stage of described 4th switching tube connect the 2nd photo-sensor the 4th pin, also by the 16 resistance ground connection; The grounded emitter of the 4th switching tube, the collector electrode of the 4th switching tube connects the 1A pin of two-way reverser, also connect VDD_IR by the 17 resistance powers end; The base stage of described 5th switching tube connect the 3rd photo-sensor the 4th pin, also by the 18 resistance ground connection; The grounded emitter of the 5th switching tube, the collector electrode of the 5th switching tube connects the 2A pin of two-way reverser, also connect VDD_IR by the 19 resistance powers end; The 1Y pin of described two-way reverser connects the P0.11 end of MCU, the 2Y pin of two-way reverser by the P0.12 end of the 22 resistance connection MCU by the 21 resistance, the VCC pin of two-way reverser connects VDD_IR and powers end, the GND pin ground connection of two-way reverser; One end of described 16 electric capacity connects VDD_IR and powers end, the other end ground connection of the 16 electric capacity, and one end connection VDD_IR of described 17 electric capacity powers end, the other end ground connection of the 17 electric capacity;

Described 2nd reception unit comprises the 23 resistance, the 24 resistance, the 25 resistance, the 18 electric capacity, the 19 electric capacity and the 20 electric capacity; One end of described 23 resistance connects the 2nd transmitting unit, one end of the 20 electric capacity and the P0.03/AIN4 of MCU chip, the other end ground connection of the 23 resistance, one end of 24 resistance connects the 2nd transmitting unit, one end of the 19 electric capacity and the P0.04/AIN5 of MCU chip, the other end ground connection of the 24 resistance, one end of 25 resistance connects the 2nd transmitting unit, one end of the 18 electric capacity and the P0.05/AIN5 of MCU chip, the other end ground connection of the 25 resistance; The equal ground connection of the other end of described 18 electric capacity, the 19 electric capacity, the 20 electric capacity.

10. an Intelligent measuring tape, it is characterised in that, comprise the Intelligent measuring tape circuit as described in claim 1-9 any one.