CN216013413U

CN216013413U - Multifunctional high-speed detection system based on infrared geminate transistors

Info

Publication number: CN216013413U
Application number: CN202121670151.XU
Authority: CN
Inventors: 蒋小刚
Original assignee: Wuxi Donghai Intelligent Control Software Co ltd
Current assignee: Wuxi Donghai Intelligent Control Software Co ltd
Priority date: 2021-07-21
Filing date: 2021-07-21
Publication date: 2022-03-11
Anticipated expiration: 2031-07-21

Abstract

The utility model discloses a multifunctional high-speed detection system based on infrared geminate transistors, which relates to the technical field of infrared detection, and comprises an MCU (microprogrammed control Unit), and a power supply, a function selection circuit, an infrared detection circuit, a digital display circuit and a direction indicating circuit which are connected with the MCU; the function selection circuit is matched with the MCU for switching system functions, including a counting function, a rotating speed measuring function and an object motion direction identifying function; the infrared detection circuit comprises two groups of infrared geminate transistors, each group of infrared geminate transistors comprises an infrared transmitting tube and an infrared photoelectric receiving tube which are respectively used as a transmitting end and a receiving end of the infrared geminate transistor, and the infrared detection circuit is used for providing two paths of infrared signals as primary effective signals; the digital display circuit is used for displaying a count value or a rotating speed value; the direction indicating circuit is used for prompting the measured object to move in the forward direction or the reverse direction. The system realizes multiple functions, can perform high-speed detection, effectively prevents electromagnetic interference and improves the detection accuracy.

Description

Multifunctional high-speed detection system based on infrared geminate transistors

Technical Field

The utility model relates to the technical field of infrared detection, in particular to a multifunctional high-speed detection system based on infrared geminate transistors.

Background

In the application of infrared technology, infrared geminate transistors are often recommended to be made into detection devices, a plurality of detection products made of infrared geminate transistors exist in the market, but the detection products are easily interfered by human body movement and ambient light, and the traditional infrared detection products can add larger RC (resistor-capacitor) to integrate and filter signals in a circuit, so that the infrared detection products can only perform some low-speed detection.

SUMMERY OF THE UTILITY MODEL

The utility model provides a multifunctional high-speed detection system based on infrared geminate transistors, aiming at the problems and the technical requirements.

The technical scheme of the utility model is as follows:

a multifunctional high-speed detection system based on infrared geminate transistors comprises an MCU, a power supply, a function selection circuit, an infrared detection circuit, a digital display circuit and a direction indication circuit, wherein the power supply, the function selection circuit, the infrared detection circuit, the digital display circuit and the direction indication circuit are connected with the MCU; the function selection circuit is matched with the MCU for switching system functions, including a counting function, a rotating speed measuring function and an object motion direction identifying function; the infrared detection circuit comprises two groups of infrared geminate transistors, each group of infrared geminate transistors comprises an infrared transmitting tube and an infrared photoelectric receiving tube which are respectively used as a transmitting end and a receiving end of the infrared geminate transistor, and the infrared detection circuit is used for providing two paths of infrared signals as primary effective signals; the digital display circuit is used for displaying a count value or a rotating speed value; the direction indicating circuit is used for prompting the measured object to move in the forward direction or the reverse direction.

The further technical scheme is that the function selection circuit comprises a switch, a first resistor and a second resistor, the fixed end of the switch is grounded, the movable end of the switch is sequentially connected with the first resistor, the second resistor and a power supply, the first resistor and the second resistor are connected in series to form a common end which is used as the output end of the function selection circuit to be connected with the MCU, and the MCU detects the opening and closing times of the switch to switch the system functions.

The infrared detection circuit further comprises an RC circuit consisting of a plurality of resistors and capacitors, a time constant of the RC circuit is set to be suitable for high-speed detection, a signal output end of the MCU is connected with transmitting end anodes of the first infrared geminate transistor and the second infrared geminate transistor through a third resistor and a fourth resistor respectively, a receiving end emitter of the first infrared geminate transistor is grounded through a fifth resistor and is also connected with a first signal input end of the MCU through a sixth resistor, a receiving end emitter of the second infrared geminate transistor is grounded through a seventh resistor and is also connected with a second signal input end of the MCU through an eighth resistor, and transmitting end cathodes and receiving end collectors of the first infrared geminate transistor and the second infrared geminate transistor are connected with a power supply; the first end of the first capacitor, the first end of the ninth resistor and the second end of the tenth resistor are further connected between the sixth resistor and the first signal input end, the first end of the second capacitor, the first end of the eleventh resistor and the second end of the twelfth resistor are further connected between the eighth resistor and the second signal input end, the second ends of the first capacitor and the second capacitor, the second ends of the ninth resistor and the eleventh resistor are all grounded, and the first ends of the tenth resistor and the twelfth resistor are connected with the power supply.

The direction indicating circuit comprises a first LED, a second LED, a first diode, a second diode, a first triode, a second triode and a plurality of resistors, wherein the first LED and the second LED adopt indicating lamps with different colors to represent forward or reverse movement; a low-level signal end of the MCU is respectively connected with an anode of the first LED and a first end of a thirteenth resistor, a cathode of the first LED is grounded through a fourteenth resistor, a second end of the thirteenth resistor and a first end of a fifteenth resistor are connected with a base electrode of a first triode, and a collector electrode of the first triode is respectively connected with an anode of the first diode and a first end of a sixteenth resistor; the high level signal end of MCU connects the positive pole of second LED and the first end of seventeenth resistance respectively, the negative pole of second LED passes through eighteenth resistance ground connection, the base of second triode is connected to the second end of seventeenth resistance and the first end of nineteenth resistance, the positive pole of second diode and the first end of twentieth resistance are connected respectively to the collecting electrode of second triode, the second end of fifteenth resistance and nineteenth resistance, the projecting pole of first triode and second triode all grounds, the negative pole of first diode and second diode, the second end of sixteenth resistance and twentieth resistance all connects the power.

The further technical scheme is that the MCU provides a rotating speed calculation formula for measuring the rotating speed of the measured object, and the expression is as follows:

wherein, N is the rotating speed of the measured object, N is the number of times of the effective signals acquired by the MCU, and t is the time for receiving the signals.

The further technical scheme is that the counting function is realized by opening and closing the switch once, the rotating speed measuring function is realized by opening and closing the switch twice, and the object moving direction recognizing function is realized by opening and closing the switch three times.

The further technical scheme is that two groups of infrared geminate transistors adopt a reflection type detection mode, and the transmitting end and the receiving end of the infrared geminate transistors are arranged on the same side of a detected object; two groups of infrared geminate transistors adopt a blocking type detection mode, and the transmitting end and the receiving end of each infrared geminate transistor are arranged on two sides of a detected object.

The further technical scheme is that the MCU is realized based on an OB38R08A01 chip, and the digital display circuit is realized based on a 2531AS nixie tube.

The beneficial technical effects of the utility model are as follows:

the MCU detects the opening and closing times of a switch in the function selection circuit to switch three system functions, after a certain function is switched, two groups of infrared geminate transistors are adopted to provide two paths of infrared signals to the MCU, the MCU is used as a primary effective signal when detecting the two paths of infrared signals, the electromagnetic interference is effectively prevented, the detection accuracy is improved, the MCU utilizes the effective signals to realize counting, calculate the rotating speed of a detected object and identify the moving direction, and a digital display circuit is called to display a counting value and a rotating speed value; the time constant of an RC circuit is set in an infrared detection circuit, so that the RC circuit is suitable for high-speed detection, and the time constant is generally reduced; the moving direction (including linear motion and rotary motion) of the object to be detected can be identified to the sequence of the receiving time of the two paths of infrared signals, and the two LED lamps of the direction indicating circuit are called to prompt.

Drawings

FIG. 1 is a schematic diagram of a multi-functional high-speed detection system provided by the present application.

Fig. 2 is a chip pin diagram of the MCU provided in the present application.

Fig. 3 is a circuit diagram of a function selection circuit provided in the present application.

Fig. 4 is a circuit diagram of an infrared detection circuit provided in the present application.

Fig. 5 is a chip pin diagram of a digital display circuit provided in the present application.

Fig. 6 is a circuit diagram of a direction indicating circuit provided in the present application.

Detailed Description

The following further describes the embodiments of the present invention with reference to the drawings.

As shown in fig. 1, a multifunctional high-speed detection system based on infrared geminate transistors comprises an MCU, and a power supply, a function selection circuit, an infrared detection circuit, a digital display circuit and a direction indication circuit connected to the MCU, wherein the power supply is further connected to other circuits of the system for supplying power, and the details of each part of the system are described below.

As shown in fig. 2, the MCU of the present application is implemented based on an OB38R08a01 chip, and switches three system functions including a counting function, a rotation speed measuring function, and an object movement direction recognizing function by detecting the number of times of opening and closing of a switch S in a function selecting circuit. The MCU is also used for receiving the infrared signal of the infrared detection circuit, calculating corresponding data according to a preselected function, calling the digital display circuit to display a numerical value, or calling the direction indicating circuit to prompt forward and reverse movement.

As shown in fig. 3, the function selecting circuit includes a switch S, a first resistor R1 and a second resistor R2, a fixed end of the switch S is grounded, a moving end of the switch S is sequentially connected to the first resistor R1, the second resistor R2 and a power supply +5V, and a common end of the first resistor R1 and the second resistor R2 connected in series is used as an output end of the function selecting circuit to be connected to a DA terminal (pin 9) of the MCU.

Optionally, this application is established switch S and is opened and shut once and realize the tally function, and switch S opens and shuts twice and realizes measuring the rotational speed function, and switch S opens and shuts the cubic and realizes discerning the object direction of motion function.

As shown in fig. 4, the infrared detection circuit includes two sets of infrared pair transistors, and an RC circuit including a plurality of resistors and capacitors, where each set of infrared pair transistors includes an infrared transmitting tube and an infrared photoelectric receiving tube, which are respectively used as a transmitting end and a receiving end of the infrared pair transistor. When two groups of infrared geminate transistors adopt a reflection type detection mode, the transmitting end and the receiving end of the infrared geminate transistors are arranged on the same side of a detected object; when two groups of infrared geminate transistors adopt a blocking type detection mode, the transmitting end and the receiving end of the infrared geminate transistors are arranged on two sides of a detected object.

Specifically, a signal output end IRA (pin 2) of the MCU is connected to the anodes of the emitting ends of the first infrared pair RFLED1 and the second infrared pair RFLED2 through a third resistor R3 and a fourth resistor R4, an emitter a end of a receiving end of the first infrared pair RFLED1 is grounded through a fifth resistor R5, the first signal input end RF1 (pin 20) of the MCU is further connected through a sixth resistor R6, an emitter b end of a receiving end of the second infrared pair RFLED2 is grounded through a seventh resistor R7, the second signal input end RF2 (pin 19) of the MCU is further connected through an eighth resistor R8, and cathodes and collectors of the emitting ends of the first infrared pair RFLED1 and the second infrared pair RFLED2 are both connected to + 5V. The first end of a first capacitor C1, the first end of a ninth resistor R9 and the second end of a tenth resistor R10 are further connected between the sixth resistor R6 and the first signal input end RF1, the first end of a second capacitor C2, the first end of an eleventh resistor R11 and the second end of a twelfth resistor R12 are further connected between the eighth resistor R8 and the second signal input end RF2, the second ends of the first capacitor C1 and the second capacitor C2, the second ends of the ninth resistor R9 and the eleventh resistor R11 are all grounded, and the first ends of the tenth resistor R10 and the twelfth resistor R12 are connected with +5V power supply.

This application makes it be applicable to high-speed detection through reducing RC circuit's time constant, and infrared detection circuitry is used for providing two way infrared signal as effective signal once, and two way infrared signal can effectively prevent electromagnetic interference, improve the rate of accuracy that detects.

AS shown in fig. 5, the digital display circuit of the present application is implemented based on a 2531AS nixie tube, and is used for displaying a count value or a rotation speed value.

As shown in fig. 6, the direction indicating circuit includes a first LED1, a second LED2, a first diode D1, a second diode D2, a first transistor Q1, a second transistor Q2, and a plurality of resistors. The direction indicating circuit is used for prompting the measured object to move in the forward direction or in the reverse direction, namely the first LED1 and the second LED2 adopt indicating lamps with different colors to indicate the forward direction or the reverse direction, and optionally, red represents the forward direction movement, and green represents the reverse direction movement.

Specifically, a low-level signal end LH (pin 13) of the MCU is respectively connected to an anode of the first LED1 and a first end of a thirteenth resistor R13, a cathode of the first LED1 is grounded through a fourteenth resistor R14, a second end of the thirteenth resistor R13 and a first end of a fifteenth resistor R15 are connected to a base of the first triode Q1, and a collector of the first triode Q1 is respectively connected to an anode of the first diode D1 and a first end of the sixteenth resistor R16. A high-level signal end RH (pin 16) of the MCU is respectively connected to an anode of the second LED2 and a first end of a seventeenth resistor R17, a cathode of the second LED2 is grounded through an eighteenth resistor R18, a second end of the seventeenth resistor R17 and a first end of a nineteenth resistor R19 are connected to a base of the second triode Q2, a collector of the second triode Q2 is respectively connected to an anode of the second diode D2 and a first end of a twentieth resistor R20, second ends of the fifteenth resistor R15 and the nineteenth resistor R19, emitters of the first triode Q1 and the second triode Q2 are both grounded, and cathodes of the first diode D1 and the second diode D2, and second ends of the sixteenth resistor R16 and the twentieth resistor R20 are both connected to the power supply + 5V.

Optionally, a signal terminal Rel1 may be led out between the first triode Q1 and the sixteenth resistor R16, a signal terminal Rel2 may be led out between the second triode Q2 and the twentieth resistor R20, and other indication circuits are externally connected through the two signal terminals Rel1 and Rel2, so that the system is adapted to various indication circuits, and the utilization rate is improved.

MCU utilizes effective signal to realize the count, calculates the rotational speed and the discernment direction of motion of testee, then the theory of operation of system is:

1) a counting function: the MCU takes the times of the effective signals as a counting value and displays the counting value through a digital display circuit.

2) The function of measuring the rotating speed is as follows: when the measured object does circular motion, the MCU provides a rotating speed calculation formula for measuring the rotating speed of the measured object, and the expression is as follows:

3) And the function of identifying the motion direction of the object is as follows: the MCU identifies the movement direction (including linear movement and rotary movement) of the object to be detected as a forward direction or a reverse direction by determining the sequence of the receiving time of the two paths of infrared signals, the movement direction of the object to be detected is specified to be the forward direction when the receiving end signals of the first infrared geminate transistors RFED 1 are identified, otherwise, the movement direction of the object to be detected is the reverse direction, the MCU outputs a low level signal in the forward direction, the first LED1 of the direction indicating circuit is lightened, the MCU outputs a high level signal in the reverse direction, and the first LED2 of the direction indicating circuit is lightened.

What has been described above is only a preferred embodiment of the present application, and the present invention is not limited to the above embodiment. It is to be understood that other modifications and variations directly derivable or suggested by those skilled in the art without departing from the spirit and concept of the present invention are to be considered as included within the scope of the present invention.

Claims

1. A multifunctional high-speed detection system based on infrared geminate transistors is characterized by comprising an MCU (microprogrammed control Unit), a power supply, a function selection circuit, an infrared detection circuit, a digital display circuit and a direction indication circuit, wherein the power supply, the function selection circuit, the infrared detection circuit, the digital display circuit and the direction indication circuit are connected with the MCU; the function selection circuit is matched with the MCU to switch system functions, including a counting function, a rotating speed measuring function and an object motion direction identifying function; the infrared detection circuit comprises two groups of infrared geminate transistors, each group of infrared geminate transistors comprises an infrared transmitting tube and an infrared photoelectric receiving tube which are respectively used as a transmitting end and a receiving end of the infrared geminate transistor, and the infrared detection circuit is used for providing two paths of infrared signals as primary effective signals; the digital display circuit is used for displaying a count value or a rotating speed value; the direction indicating circuit is used for prompting the measured object to move forwards or backwards.

2. The system according to claim 1, wherein the function selection circuit comprises a switch, a first resistor and a second resistor, a fixed end of the switch is grounded, a movable end of the switch is sequentially connected with the first resistor, the second resistor and a power supply, a common end of the first resistor and the second resistor which are connected in series is used as an output end of the function selection circuit to be connected with the MCU, and the MCU detects the opening and closing times of the switch to switch system functions.

3. The system according to claim 1, wherein the infrared detection circuit further comprises an RC circuit composed of a plurality of resistors and capacitors, a time constant of the RC circuit is set to be suitable for high-speed detection, the signal output terminal of the MCU is connected to the anodes of the emitting terminals of the first infrared pair and the second infrared pair through a third resistor and a fourth resistor, respectively, the emitter of the receiving terminal of the first infrared pair is grounded through a fifth resistor, the emitter of the receiving terminal of the second infrared pair is grounded through a sixth resistor, the emitter of the receiving terminal of the second infrared pair is grounded through a seventh resistor, the emitter of the receiving terminal of the second infrared pair is connected to the second signal input terminal of the MCU through an eighth resistor, and the cathodes and collectors of the emitting terminals of the first infrared pair and the second infrared pair are connected to a power supply; the first end of a first capacitor, the first end of a ninth resistor and the second end of a tenth resistor are further connected between the sixth resistor and the first signal input end, the first end of a second capacitor, the first end of an eleventh resistor and the second end of a twelfth resistor are further connected between the eighth resistor and the second signal input end, the second ends of the first capacitor and the second capacitor, the second ends of the ninth resistor and the eleventh resistor are all grounded, and the first ends of the tenth resistor and the twelfth resistor are connected with a power supply.

4. The system of claim 1, wherein the direction indicating circuit comprises a first LED, a second LED, a first diode, a second diode, a first transistor, a second transistor, and a plurality of resistors, wherein the first LED and the second LED use indicator lights of different colors to indicate forward or reverse motion; a low level signal end of the MCU is respectively connected with an anode of the first LED and a first end of a thirteenth resistor, a cathode of the first LED is grounded through a fourteenth resistor, a second end of the thirteenth resistor and a first end of a fifteenth resistor are connected with a base electrode of the first triode, and a collector electrode of the first triode is respectively connected with an anode of the first diode and a first end of a sixteenth resistor; MCU's high level signal end connects respectively the positive pole of second LED and the first end of seventeenth resistance, the negative pole of second LED passes through eighteenth resistance ground connection, the second end of seventeenth resistance and the first end of nineteenth resistance are connected the base of second triode, the collecting electrode of second triode is connected respectively the positive pole of second diode and the first end of twentieth resistance, the second end of fifteenth resistance and nineteenth resistance, the projecting pole of first triode and second triode all ground connection, the negative pole of first diode and second diode, the second end of sixteenth resistance and twentieth resistance all connect the power.

5. The system of claim 1, wherein when the object to be measured makes a circular motion, the MCU provides a rotation speed calculation formula for measuring the rotation speed of the object to be measured, and the expression is:

and N is the rotating speed of the measured object, N is the number of times of the effective signals acquired by the MCU, and t is the time for receiving the signals.

6. The system of claim 2, wherein the switch is turned on and off once to realize a counting function, the switch is turned on and off twice to realize a rotation speed measuring function, and the switch is turned on and off three times to realize an object movement direction identifying function.

7. The system according to any one of claims 1 to 6, wherein two groups of infrared pair tubes adopt a reflection type detection mode, and the transmitting end and the receiving end of the infrared pair tubes are arranged on the same side of the object to be detected; two groups of infrared geminate transistors adopt a blocking type detection mode, and the transmitting end and the receiving end of each infrared geminate transistor are arranged on two sides of a detected object.

8. The system according to any one of claims 1-6, wherein the MCU is implemented based on OB38R08A01 chip, and the digital display circuit is implemented based on 2531AS nixie tube.