CN208968648U - A kind of high-precision electronic claims - Google Patents
A kind of high-precision electronic claims Download PDFInfo
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- CN208968648U CN208968648U CN201821604396.0U CN201821604396U CN208968648U CN 208968648 U CN208968648 U CN 208968648U CN 201821604396 U CN201821604396 U CN 201821604396U CN 208968648 U CN208968648 U CN 208968648U
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- circuit module
- microcontroller
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- power supply
- resistance
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Abstract
The utility model relates to a kind of high-precision electronics to claim, it includes the weighing sensor for carrying out weighing measurement, for receiving the signal and the A/D conversion circuit module for carrying out analog-to-digital conversion that weighing sensor transmits, microcontroller for receiving the signal of A/D conversion circuit module transmitting and being analyzed and processed, it is connect for the signal I/O output end with microcontroller and to microcontroller treated display circuit module that information shown, the SD card circuit module realized and data are carried out with storage and reading data is connect for the signal I/O output end with microcontroller, and the key module for realizing that instruction is manually entered is connect with the I/O input terminal of microcontroller.It can be realized high-precision weight measurement by strain gauge transducer and high-precision A/D converter part, temperature detection and have data record storage and read functions, carry out reconciliation after facilitating businessman to sell article daily.
Description
Technical field
The utility model relates to measure detection technique field more particularly to a kind of high-precision electronic to claim.
Background technique
Scale is a kind of commonly used measuring appliance in real work and life.With measurement technology and electronic technology
Development, the meausring apparatuses such as steelyard, platform balance, platform scale of traditional pure mechanic structure are gradually eliminated, electronic weighting equipment electronic scale, electricity
Sub- day equality is accurate with it, quickly, conveniently, intuitive display many advantages, such as and have been favored by people.
Although but now it is more and more using the scene of electronic scale, the overwhelming majority measurement accuracy it is not high or
Person due to being unaware of for a long time in the case where outrange using cause electronic scale measuring accuracy reduce or service life week
Phase shortens.
Utility model content
The shortcomings that the purpose of the utility model is to overcome the prior arts provides a kind of high-precision electronic and claims, and solves existing
There is deficiency existing for electronic scale.
The purpose of this utility model is achieved through the following technical solutions: a kind of high-precision electronic claims, it include for into
The weighing sensor of row weighing measurement, the A/D conversion for receiving the signal of weighing sensor transmitting and carry out analog-to-digital conversion are electric
Road module is used for and microcontroller for receiving the signal of A/D conversion circuit module transmitting and the microcontroller that is analyzed and processed
The signal I/O output end of device connects and to microcontroller treated display circuit module that information shown, for it is micro-
Controller signal I/O output end connection realize to data carry out storage and reading data SD card circuit module, and with it is micro-
The key module that instruction is manually entered is realized in the I/O input terminal connection of controller.
Electronic scale further includes the buzzer circuit module that alarm sounds are carried out when being more than weight measurement threshold value, microcontroller
Signal I/O output end connect with the input terminal of buzzer circuit module.
Weighing sensor includes the strain gauge transducer using full bridge measurement circuit, and the full bridge measurement circuit includes four
The identical strain sheet resistance of a resistance value, four strain sheet resistances are interconnected to a differential full-bridge, and the one of the differential full-bridge
Some access power supply in a diagonal line two o'clock, another point ground connection, the signal of another cornerwise two o'clock output measurement.
A/D conversion circuit module includes an A/D conversion chip, and the 2nd pin of A/D conversion chip is connected to a triode
Filtering is realized with a capacitor, and the 2nd pin has been also connected with the output voltage size that a pair of of divider resistance realizes control triode；The
7,8,9 a contact pin is connected with 10 pins, is answered wherein being connected between the 7th and 8 pins and contact pin described in two realization difference acquisitions
The resistance of variant sensor variable signal, the 9th and 10 pins connect and are connected to two realizations between contact pin interference signal is isolated
Resistance；It is grounded after 15th pin serial connection, one resistance, which realizes the input rate of control data；11st and 12 pins are logical
Letter interface is connect with the microcontroller.
Electronic scale further includes providing for microcontroller, SD card circuit module, A/D conversion circuit module and display circuit module
The power supply circuit module of power supply supply；Voltage output end and microcontroller, SD card circuit module, the A/D of power supply circuit module turn
Circuit module is changed to connect with the supply voltage input terminal of display circuit module.
Electronic scale further includes the temperature sensor for detecting temperature；The signal output end and microcontroller of temperature sensor
Signal I/O input terminal connection.
Buzzer circuit module includes that a pair of of electric current amplifies triode to drive buzzer；The emitter of triode
Ground connection, base stage connects after connecting a resistance with the microcontroller, and one end of collector and buzzer connects, buzzer it is another
End is connect with the voltage output end of power supply circuit module.
Power supply circuit module is including a USB power supply interface, a power supply self-lock switch and with voltage stabilizing chip；USB power supply connects
The voltage output end of mouth is connect with the input terminal of power supply self-lock switch, the output end of power supply self-lock switch and the voltage of voltage stabilizing chip
Input terminal connection.
The utility model has the advantage that
1, high-precision weight measurement can be realized by strain gauge transducer and high-precision A/D converter part, temperature
Degree detects and has data record storage and read functions, carries out reconciliation after facilitating businessman to sell article daily；
2, data can be shown by OLED, and can be mentioned by buzzer to beyond progress alarm when measuring threshold value
Show, effectively prevents the occurrence of causing the service life period to shorten due to electronic scale is used because outranging for a long time；
3, this electronic scale circuit is simple, has the characteristics that inexpensive, portable, high-precision and has a wide range of application.
Detailed description of the invention
Fig. 1 is the principle assumption diagram of electronic scale；
Fig. 2 is the pin circuitry figure of single-chip microcontroller；
Fig. 3 is display circuit module circuit diagram；
Fig. 4 is SD card circuit figure；
Fig. 5 is full bridge measurement circuit diagram；
Fig. 6 is A/D conversion circuit module circuit diagram；
Fig. 7 is power supply circuit module circuit diagram；
Fig. 8 is buzzer circuit module circuit diagram.
Specific embodiment
The utility model is further described with reference to the accompanying drawing, but the protection scope of the utility model is not limited to
It is as described below.
As shown in Figure 1, a kind of high-precision electronic claims, it includes the weighing sensor for carrying out weighing measurement, for connecing
It receives the signal of weighing sensor transmitting and carries out the A/D conversion circuit module of analog-to-digital conversion, for receiving A/D conversion circuit module
The signal of transmitting and the microcontroller being analyzed and processed are connect and for the signal I/O output end with microcontroller to micro-control
Device processed treated display circuit module that information shown, connect realization for the signal I/O output end with microcontroller
Data are carried out with the SD card circuit module of storage and reading data, and connect realization instruction with the I/O input terminal of microcontroller
The key module being manually entered.
Electronic scale further includes the buzzer circuit module that alarm sounds are carried out when being more than weight measurement threshold value, microcontroller
Signal I/O output end connect with the input terminal of buzzer circuit module.
Preferably, as shown in Fig. 2, microcontroller uses model STM32F103C8T6 single-chip microcontroller, the single-chip microcontroller one is shared
40 pins, wherein the VCC voltage of the 18th pin connection 5V, the 20th connects the VCC3.3 voltage of 3.3V, the 39th He with 38 pins
40 pins ground connection；Key module includes four pins of the 11st, 12,13 and 14 by key connection single-chip microcontroller.
One is connected on single-chip microcontroller for resetting the reset circuit of single-chip microcontroller and providing the crystal oscillator of crystal oscillator clock for single-chip microcontroller
37th pin of circuit, reset circuit and single-chip microcontroller connects, and the 6th and 7 pins of crystal oscillating circuit and single-chip microcontroller connect.
Preferably, as shown in Figure 3 and Figure 4, display circuit module uses OLED12864 display module, has 128 column and 64
Row.It includes two column drivers and a row driver.There are a driving signal and a synchronization signal when powering on, it is micro-
The signal that processor provides is only related with row driver.Shield corresponding one shielded in interior display memory of display state of each point
A data.Data in display-memory are used as driving each point signal on screen.The 1st of its 14th and 15 pin and single-chip microcontroller
It is connected with 5 pins, the 2nd and 4 pins connection of device the 18th and 19 pins and single-chip microcontroller.SD card circuit module is realized to weight and temperature
The record of degree evidence drives SD card by the SPI interface of single-chip microcontroller.
Preferably, described as shown in figure 5, weighing sensor includes the strain gauge transducer using full bridge measurement circuit
Full bridge measurement circuit includes strain sheet resistance R23, R24, R25 and R26 that four resistance values are 1K, and four strain sheet resistances mutually connect
It is connected into a differential full-bridge, resistance R23 connects VCC voltage, one end ground connection of resistance R24 and R25, resistance R23 with one end of R26
It is that signal output end is connected on contact pin P3 with one end of R24 and one end of resistance R5 and R26；Its main feature is that: when four bridges
When arm resistance reaches corresponding relation, electric bridge output is zero, or just has voltage output, can be measured with sensitive galvanometer, so
Electric bridge can accurately measure small resistance variations.Strain resistor connects in bridge circuit as arm resistance.When no pressure,
Bridge balance, output voltage zero；When having pressure, the arm resistance value of electric bridge changes, electric bridge disequilibrium.Full bridge measurement
In circuit, identical two panels foil gauge access its output sensitivity of electric bridge opposite side of stress property is doubled than half-bridge, it is non-
Linearity error and temperature error are improved.
Therefore the resistance value of strain sheet resistance is influenced by variation of ambient temperature, in order to allow weighing sensor in defined temperature
Using raising measuring accuracy also for its service life of guarantee in range, therefore electronic scale further includes for detecting environment temperature
Temperature sensor；The signal output end of temperature sensor and the signal I/O input terminal of microcontroller connect.
Strain gauge resistance determines pressure by measuring the variation of resistance value, and the working principle of strain gauge resistance is to be based on
Resistance strain effect, i.e., when conductor generates mechanical deformation, its resistance value accordingly changes.
Assuming that a resistance wire, the initial resistance value in non-stress is R=ρ l/s, wherein ρ is the resistance of resistance wire
Rate, l are the length of resistance wire, and s is the sectional area of resistance wire；
Resistance wire under the effect of external force, will cause the changes delta R of resistance, and have Δ R/R=Δ l/l- Δ s/s+ Δ ρ/
ρ, enabling the axial effect of resistance wire is ε=Δ l/l, and Δ r/r=- μ (Δ l/l)=- μ ε, u known to the mechanics of materials is resistance wire
The Poisson's coefficient of material, it is collated to obtain
Usually the opposite variation of resistance caused by unit strain is referred to as the sensitivity coefficient of resistive conductor, expression formula is
From above formula, it is apparent that resistance wire sensitivity coefficient k0Consist of two parts: by material after (1+2 μ) expression stress
Caused by the geometrical variations of material；It indicates caused by material resistance variation.For metal material,?
Resistance value it is more much smaller than (1+2 μ), can ignore, therefore k0=1+2 μ.Experimental results demonstrate in the resistance wire stretch ratio limit
Interior, the opposite of resistance changes, i.e. k directly proportional to strain0=1.7~3.6.
Preferably, as shown in fig. 6, A/D conversion circuit module includes a model HX711A/D conversion chip, in circuit diagram
Capacitor be filter capacitor, the 2nd pin of A/D conversion chip connects the collector of a triode Q1, the hair of triode Q1
Emitter-base bandgap grading connects a filter capacitor C4, the case where for preventing output pin overtension from causing chip interior job insecurity,
2nd pin has been also connected with the output voltage size that a pair of of divider resistance R5 and R6 realizes control triode；The pin of 7th, 8,9 and 10
A contact pin P2 is connected, is become wherein being connected to two realization difference between the 7th and 8 pins and contact pin and acquiring the strain gauge transducer
The resistance of interference signal is isolated with being connected to two between contact pin and realize in the resistance R9 and the connection of the pin of R11, the 9th and 10 for changing signal
R7 and R8；It is grounded after 15th pin serial connection, one resistance R4, resistance R4 realizes the input rate of control data；11st and 12 pins
For the connection of the 26th and 28 pins of communication interface and single-chip microcontroller, the signal of weighing sensor can be transmitted to by connecting contact pin P2 and P3
In A/D conversion circuit.
Because the current signal that this programme needs to export is 20-1000mA, stepping 1mA, and display numerical value is required, therefore,
A/D converter at least needs 12 conversion accuracies, it is contemplated that the I/O interface of single-chip microcontroller there may be using nervous factor,
Selection uses HX711, and quantified precision can reach 1/4096 < 1/1000, HX711 and aim at 24 that high-precision electronic claims design
A/D converter chip, compared with the other chips of same type, which includes regulated power supply, on-chip clock oscillator etc.
Peripheral circuit required for other similar cake cores has many advantages, such as integrated level height, fast response time, strong interference immunity, reduction
The complete machine cost of electronic scale, improves the Performance And Reliability of complete machine.The chip and the interface of rear end MCU chip and programming are non-
Often simple, all control signals are driven by pin, without the register programming to chip interior.Input selector switch can be selected arbitrarily
Channel A or channel B is taken, is connected with its internal low-noise programmable amplifier.The programmable-gain of channel A is 128 or 64, right
The full scale differential input signal amplitude answered is respectively ± 20mV or ± 40mV.Channel B is then 64 fixed gains, is used for system
Parameter detecting.The regulated power supply provided in chip can direct out the A/D converter in portion's sensor and chip and provide power supply,
Other analog power is not necessarily on system board.Clock oscillator in chip does not need any external component.
Simulation input: A analog differential input in channel can directly connect with the difference output of bridge type magnetic sensor.Since bridge-type passes
The signal of sensor output is smaller, in order to make full use of the input dynamic range of A/D converter, the programmable-gain in the channel compared with
It greatly, is 128 or 64.Full scale differential input voltage difference ± 20mV or ± 40mV corresponding to these gains.Channel B is to fix
Gain, corresponding full scale differential input voltage be ± 40mV.Channel B is applied to the system parameter inspection including battery
It surveys.
Power supply: digital power (DVDD) should use digital power system power supply identical with MCU chip.In HX711 chip
Volume voltage regulator circuit can provide analog power to A/D converter and external sensor simultaneously.The supply voltage (VSUP) of regulated power supply
It can be identical as digital power (DVDD).The output voltage values (VAVDD) of regulated power supply by external divider resistance and chip output
Reference voltage VBG is determined.The output voltage should be selected at least 100mV lower than the input voltage of regulated power supply (VSUP).If no
Using the voltage regulator circuit in chip, pin VSUP should be connected with pin AVDD, and be connected to the low noise acoustic mode that voltage is 2.6-5.5V
Quasi- power supply.External capacitor is not needed on pin VBG, pin VFB should be grounded, and pin BASE is connectionless.
Clock selecting: if pin XI is grounded, HX711 will be automatically selected using internal clock oscillators, and be closed automatically
Close the interlock circuit of external clock input and crystal oscillator.In this case, typical output data rate is 10Hz or 80Hz.If needed
Accurate output data rate is wanted, external input clock can be connected on XI pin by the capacitance of a 20pF, or
Crystal oscillator is connected on XI and XO pin.In this case, the clock oscillator circuit in chip can be automatically closed, crystal oscillator clock
Or external input clock is used.At this point, if crystal oscillator frequency be 11.0592MHz, output data rate be accurate 10Hz or
80Hz.Output data rate and crystal oscillator frequency are scaling up or are reduced with above-mentioned relation.Using external input clock, when external
Clock signal is not necessarily required to as square wave.The blocking electricity that clock signal on the crystal oscillator output pin of MCU chip can be passed through 20pF
Appearance is connected on XI pin, is inputted as external clock.The amplitude of external clock input signal can be down to 150mV.
Electronic scale further includes providing for microcontroller, SD card circuit module, A/D conversion circuit module and display circuit module
The power supply circuit module of power supply supply；Voltage output end and microcontroller, SD card circuit module, the A/D of power supply circuit module turn
Circuit module is changed to connect with the supply voltage input terminal of display circuit module.
As shown in fig. 7, power supply circuit module is including a USB power supply interface, a power supply self-lock switch and with voltage stabilizing chip
AMS1117-3.3；The voltage output end of USB power supply interface is connect with the input terminal of power supply self-lock switch, power supply self-lock switch
Output end and the voltage input end of voltage stabilizing chip connect；The VCC voltage pressure stabilizing of the 5V of input is arrived 3.3V's by voltage stabilizing chip
To need the module powered to be powered after VCC3.3 voltage, VCC3.3 voltage end is also connected with a current-limiting resistance.
As shown in figure 8, buzzer circuit module includes that a pair of of electric current amplifies triode to drive buzzer；Three poles
The emitter of pipe is grounded, and base stage is connect after connecting a resistance with the 36th pin of single-chip microcontroller, and one end of collector and buzzer connects
It connects, the other end of buzzer is connect with the voltage output end of power supply circuit module.Buzzer principle of sound is that electric current passes through electromagnetism
Coil makes electromagnetic coil generate magnetic field to drive vibrating membrane sounding, it is therefore desirable to which certain electric current could drive it, single-chip microcontroller
The electric current of I/O pin output is smaller, therefore the Transistor-Transistor Logic level of single-chip microcontroller output does not drive buzzer substantially, it is therefore desirable to increase
The circuit of one Current amplifier.So amplifying driving buzzer by a triode C8550.
The working principle of the utility model are as follows: electric signal is converted for this physical quantity of pressure by sensor, that is, is sensed
After resistance strain gage inside device senses pressure, minor change occurs for resistance, by full bridge measurement circuit by the small of resistance
Variation is converted to the minor change of voltage, and signal is adjusted to the range that A/D can be acquired, is then acquired by A/D by HX711,
Then collected 24 low and high levels are sent to single-chip microcontroller by the port DOUT to be handled, after single-chip microcontroller processing, number
Signal is transported in display circuit, exports measurement result by display circuit, by the calibration of the record by key control data.
Claims (6)
1. a kind of high-precision electronic claims, it is characterised in that: it includes the weighing sensor for carrying out weighing measurement, for receiving
The signal of the weighing sensor transmitting and the A/D conversion circuit module for carrying out analog-to-digital conversion, for receiving the A/D conversion electricity
The signal of road module transmitting and the microcontroller being analyzed and processed, for connecting with the signal I/O output end of the microcontroller
It connects and to the microcontroller treated display circuit module that information shown, for the signal with the microcontroller
I/O output end connection realize to data carry out storage and reading data SD card circuit module, and with the microcontroller
The key module that instruction is manually entered is realized in the connection of I/O input terminal；
The electronic scale further includes for the microcontroller, the SD card circuit module, the A/D conversion circuit module and institute
It states display circuit module and the power supply circuit module of power supply supply is provided；The voltage output end of the power supply circuit module with it is described
The supply voltage input of microcontroller, the SD card circuit module, the A/D conversion circuit module and the display circuit module
End connection；
The power supply circuit module is including a USB power supply interface, a power supply self-lock switch and with voltage stabilizing chip；Described
The voltage output end of USB power supply interface is connect with the input terminal of the power supply self-lock switch, the power supply self-lock switch it is defeated
Outlet is connect with the voltage input end of the voltage stabilizing chip.
2. a kind of high-precision electronic according to claim 1 claims, it is characterised in that: the electronic scale further includes being more than
The buzzer circuit module of alarm sounds, the signal I/O output end of the microcontroller and institute are carried out when weight measurement threshold value
State the input terminal connection of buzzer circuit module.
3. a kind of high-precision electronic according to claim 1 claims, it is characterised in that: the weighing sensor includes using
The strain gauge transducer of full bridge measurement circuit, the full bridge measurement circuit include the identical strain sheet resistance of four resistance values, four
A strain sheet resistance is interconnected to a differential full-bridge, a little accesses electricity in a diagonal line two o'clock of the differential full-bridge
Source, another point ground connection, the signal of another cornerwise two o'clock output measurement.
4. a kind of high-precision electronic according to claim 3 claims, it is characterised in that: the A/D conversion circuit module packet
An A/D conversion chip is included, the 2nd pin of the A/D conversion chip is connected to a triode and a capacitor realizes filtering,
2nd pin has been also connected with the output voltage size that a pair of of divider resistance realizes control triode；The pin of 7th, 8,9 and 10 connects one
Contact pin, wherein being connected to two realization difference between the 7th and 8 pins and contact pin acquires the strain gauge transducer variable signal
Resistance, the 9th and 10 pins, which are connected, is isolated the resistance of interference signal with being connected to two between contact pin and realize；15th pin serial connection one
It is grounded after resistance, which realizes the input rate of control data；11st and 12 pins are communication interface and the microcontroller
Connection.
5. a kind of high-precision electronic according to claim 1 claims, it is characterised in that: the electronic scale further includes for examining
The temperature sensor of testing temperature；The signal I/O input terminal of the signal output end of the temperature sensor and the microcontroller
Connection.
6. a kind of high-precision electronic according to claim 2 claims, it is characterised in that: the buzzer circuit module includes
A pair of of electric current amplifies the triode to drive buzzer；The emitter of the triode is grounded, after base stage connects a resistance
It is connect with the microcontroller, one end connection of collector and buzzer, the other end of buzzer and the electricity of power supply circuit module
Press output end connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821604396.0U CN208968648U (en) | 2018-09-29 | 2018-09-29 | A kind of high-precision electronic claims |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821604396.0U CN208968648U (en) | 2018-09-29 | 2018-09-29 | A kind of high-precision electronic claims |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208968648U true CN208968648U (en) | 2019-06-11 |
Family
ID=66756819
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821604396.0U Expired - Fee Related CN208968648U (en) | 2018-09-29 | 2018-09-29 | A kind of high-precision electronic claims |
Country Status (1)
| Country | Link |
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| CN (1) | CN208968648U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112556816A (en) * | 2020-12-10 | 2021-03-26 | 深圳市道中创新科技有限公司 | Weighing system and weighing method |
| CN113251282A (en) * | 2021-05-11 | 2021-08-13 | 吉林华瑞基因科技有限公司 | Regulating mechanism for precise NGS lung cancer diagnosis device |
| CN113280837A (en) * | 2021-03-29 | 2021-08-20 | 国网电力科学研究院有限公司 | Circuit and method for improving sensitivity of differential resistance type sensor |
-
2018
- 2018-09-29 CN CN201821604396.0U patent/CN208968648U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112556816A (en) * | 2020-12-10 | 2021-03-26 | 深圳市道中创新科技有限公司 | Weighing system and weighing method |
| CN113280837A (en) * | 2021-03-29 | 2021-08-20 | 国网电力科学研究院有限公司 | Circuit and method for improving sensitivity of differential resistance type sensor |
| CN113251282A (en) * | 2021-05-11 | 2021-08-13 | 吉林华瑞基因科技有限公司 | Regulating mechanism for precise NGS lung cancer diagnosis device |
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| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190611 Termination date: 20190929 |