CN210222251U - Ultrasonic reversing radar based on single chip microcomputer - Google Patents
Ultrasonic reversing radar based on single chip microcomputer Download PDFInfo
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- CN210222251U CN210222251U CN201820967473.2U CN201820967473U CN210222251U CN 210222251 U CN210222251 U CN 210222251U CN 201820967473 U CN201820967473 U CN 201820967473U CN 210222251 U CN210222251 U CN 210222251U
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- 238000001514 detection method Methods 0.000 claims abstract description 4
- 238000009529 body temperature measurement Methods 0.000 claims description 4
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Abstract
The utility model relates to an ultrasonic wave radar of backing a car based on singlechip, including single chip microcomputer control circuit, display circuit and ultrasonic emission and receiving circuit, warning circuit and temperature detection circuit, through ultrasonic emission and receiving circuit transmission and receiving ultrasonic signal to calculate from the transmitting signal to receiving the time difference between the ultrasonic signal, and then calculate and obtain the rear of a vehicle apart from the distance between the barrier.
Description
Technical Field
The utility model relates to an automobile safety field, specific ultrasonic wave radar of backing a car based on singlechip that says so.
Background
With the rapid development of science and technology, methods and means for ranging are becoming more and more abundant, and the best known methods are optical ranging, radio ranging and ultrasonic ranging, respectively. Of these three ranging methods. The optical ranging is most accurate, but has higher requirement on the environment, is particularly easily influenced by external tiny factors, has higher difficulty in later maintenance, higher cost and more daunting price, and is mainly applied to the fields of military science and technology and aerospace. Another radio distance measurement mainly uses the principle of electromagnetic waves, but is also easily affected by various external electromagnetic waves when applied, so that measurement precision deviation is caused. Therefore, in conclusion, the third ultrasonic ranging is easier to control, the measurement is not easy to be interfered by the outside, the cost is low, and the third ultrasonic ranging is not suitable as a principle for manufacturing the automobile reversing radar. The available advantages of ultrasound are summarized: 1. the signals are centralized and are not easily interfered; 2. the directivity is strong, and the final measurement result can be more accurate; 3. the cost is low, and the production and carrying are convenient.
Disclosure of Invention
The to-be-solved technical problem of the utility model is to provide an ultrasonic wave radar of backing a car based on singlechip can accurate judgement car afterbody and the distance between the barrier to carry out the distance through the display and show, if the distance is too near, two kinds of forms of accessible reputation report to the police.
In order to solve the technical problem, the utility model discloses a technical scheme does:
the utility model provides an ultrasonic wave radar of backing a car based on singlechip, characterized by: the ultrasonic wave;
the STC89C51 single chip microcomputer is connected with a display circuit, and the display circuit comprises an exclusion resistor, a latch and four one-bit digital display tubes;
the ultrasonic wave transmitting and receiving module is connected to the 89C51 single chip microcomputer, the ultrasonic wave transmitting and receiving module adopts an HC-SR04 ultrasonic wave ranging module, a pulse trigger pin of the HC-SR04 ultrasonic wave ranging module is connected with a P2.2 pin of the STC89C51 single chip microcomputer, an echo pin of the HC-SR04 ultrasonic wave ranging module is connected with a P2.3 pin of the STC89C51 single chip microcomputer, a VCC pin of the HC-SR04 ultrasonic wave ranging module is connected with a +5V power supply, and a GND pin of the HC-SR04 ultrasonic wave ranging module is grounded;
the STC89C51 single chip microcomputer is also connected with an alarm circuit and a temperature detection circuit;
the ultrasonic transmitting and receiving module is fixedly arranged on the outer side surface of the automobile, and the digital display tube is fixedly arranged on the inner wall of the automobile cab.
In order to optimize the utility model described above, the concrete measures taken still include:
the temperature measurement circuit include temperature sensor, temperature sensor adopt DS18B20 type temperature sensor, DS18B20 type temperature sensor's GND pin ground connection, DS18B20 type temperature sensor's VCC pin and +5V power connection, DS18B20 type temperature sensor's VCC pin still be connected with resistance R2 one end, resistance R2's the other end is connected with DS18B20 type temperature sensor's DQ pin, DS18B20 type temperature sensor's DQ pin still is connected with the P1.1 pin of STC89C51 singlechip, DS18B20 type temperature sensor fixed mounting on the lateral surface of car.
The alarm circuit comprises a loudspeaker, the loudspeaker comprises two binding posts, one binding post is connected with a power supply, the power supply is further connected with the anode of an LED diode, the cathode of the LED diode is connected with one end of a resistor R6, the other end of the resistor R6 is connected with the other binding post of the loudspeaker, the other end of the resistor R6 is further connected with the emitting electrode of a triode Q5, the collecting electrode of the triode Q5 is grounded, the base of the triode Q5 is movably connected with a resistor R20, and the other end of the resistor R20 is connected with a P1.0 pin of an STC89C51 single chip microcomputer.
The triode Q5 adopts a 9012PNP triode, and the loudspeaker and the LED diode are arranged on the inner wall of the automobile cab.
The latch adopts a 74HC573 type latch, pins D0, D1, D3, D4, D5, D6 and D7 of the 74HC573 type latch are respectively connected with pins P0.0, P0.1, P0.2, P0.3, P0.4, P0.5, P0.6 and P0.7 of an STC89C51 singlechip correspondingly, pins OE, GND and LE of the 74HC573 type latch are grounded, pins VCC of the 74HC573 type latch are connected with a +5V power supply, pins a, b, C, D, e, f, g and dp of four one-bit digital display tubes of the 74HC573 type latch are respectively connected with pins a, b, C, D, e, f and g and dp of the four one-bit digital display tubes, pins VT of the four-bit digital display tubes are respectively connected with the collectors of triodes Q1, Q2, Q3 and Q4, pins Q6 3, Q2, Q2, Q865, resistor 11, resistor 8672, resistor 36R 8672, resistor 8672, 3653 and resistor 8672 are respectively connected with the emitter of the triode Q8472 and resistor 3689R 8672, the other end of the resistor R11 is connected with a pin P2.5 of the STC89C51 single chip microcomputer, the other end of the resistor R12 is connected with a pin P2.6 of the STC89C51 single chip microcomputer, and the other end of the resistor R13 is connected with a pin P2.7 of the STC89C51 single chip microcomputer.
The one-bit digital display tube is a common cathode digital display tube.
This kind of ultrasonic wave radar of backing a car based on singlechip can reach beneficial effect do:
first, rely on single chip microcomputer system to realize the integration to alarm device and range unit, when having guaranteed system architecture stability, further reduced system architecture's volume.
And secondly, by means of stable circuit connection, the sensors can be arranged at any positions on the vehicle body conveniently.
And thirdly, the display screen can display the distance between the tail of the vehicle and the obstacle when the vehicle is reversed, and then the temperature outside the vehicle is acquired through the temperature sensor in a non-reversing state, and the temperature is displayed on the display screen.
Fourthly, the device is easy to program and correct, can accurately judge the distance between the tail of the automobile and the barrier, and can display the distance through the display, and if the distance is too short, the alarm can be given through two forms of sound and light.
Drawings
Fig. 1 is the utility model relates to a circuit schematic diagram of ultrasonic wave radar of backing a car based on singlechip.
Fig. 2 is the utility model relates to an ultrasonic wave radar alarm circuit that backs a car's circuit schematic diagram based on singlechip.
Fig. 3 is the utility model relates to an ultrasonic wave radar of backing a car ultrasonic emission and receiving module's circuit schematic diagram based on singlechip.
Fig. 4 is the utility model relates to an ultrasonic wave radar temperature measurement circuit for backing a car's circuit schematic diagram based on singlechip.
Detailed Description
The invention is further described below with reference to the drawings and specific preferred embodiments.
The utility model provides an ultrasonic wave radar of backing a car based on singlechip, characterized by: the ultrasonic wave;
the STC89C51 single chip microcomputer is connected with a display circuit, and the display circuit comprises an exclusion resistor, a latch and four one-bit digital display tubes; the latch adopts a 74HC573 type latch, pins D0, D1, D3, D4, D5, D6 and D7 of the 74HC573 type latch are respectively connected with pins P0.0, P0.1, P0.2, P0.3, P0.4, P0.5, P0.6 and P0.7 of an STC89C51 singlechip correspondingly, pins OE, GND and LE of the 74HC573 type latch are grounded, pins VCC of the 74HC573 type latch are connected with a +5V power supply, pins a, b, C, D, e, f, g and dp of four one-bit digital display tubes of the 74HC573 type latch are respectively connected with pins a, b, C, D, e, f, g and dp of the four one-bit digital display tubes, VT pins of the four-bit digital display tubes are respectively connected with pins a, Q1, Q2, Q3 and Q4, a collector of the triode Q1, Q2, Q6862, Q56, Q865, Q8672, an emitter of the triode 11, a resistor 3653, a resistor R8672, a resistor 3653, a resistor, a, the other end of the resistor R11 is connected with a pin P2.5 of the STC89C51 single chip microcomputer, and the other end of the resistor R12 is connected with a pin P2.6 of the STC89C51 single chip microcomputer. After the singlechip calculates the distance between the singlechip and the obstacle, the distance needs to be output through a display device to transmit information to a driver, so the display output device is an indispensable component of the reversing radar, and only simple distance information consisting of numbers needs to be transmitted.
The ultrasonic wave transmitting and receiving module is connected to the 89C51 single chip microcomputer, the ultrasonic wave transmitting and receiving module adopts an HC-SR04 ultrasonic wave ranging module, a pulse trigger pin of the HC-SR04 ultrasonic wave ranging module is connected with a P2.2 pin of the STC89C51 single chip microcomputer, an echo pin of the HC-SR04 ultrasonic wave ranging module is connected with a P2.3 pin of the STC89C51 single chip microcomputer, a VCC pin of the HC-SR04 ultrasonic wave ranging module is connected with a +5V power supply, and a GND pin of the HC-SR04 ultrasonic wave ranging module is grounded;
after the singlechip receives the driving signal, 8 pulse signals with the frequency of 40KHz are continuously generated, the pulse signals are amplified by an internal amplifying circuit and then continuously sent out for about 200us, a P2.3 end outputs a reverberation signal while receiving the pulse signals, and the reverberation level is in direct proportion to the measuring distance. After the program in the single chip is executed, the port P0.1 can generate a pulse signal with the frequency of 40KHz, and the pulse signal is amplified by an amplifying circuit consisting of a triode to drive the ultrasonic transmitting probe to work and transmit ultrasonic waves. If the receiving head is matched with the transmitting head, the ultrasonic modulation pulse is converted into a signal of alternating voltage. After amplification by the two-stage operational amplifier, the center frequency of the voltage-controlled oscillator becomes f0=1/1.R8C 3. Therefore, the input signal is amplified by 25mv, the output end of P2.3 changes from high level signal to low level signal, which is sent to the single chip microcomputer as the signal of the interrupt request and then processed by the internal of the single chip microcomputer.
When receiving the signal, the single chip outputs a low level signal at the output end, meanwhile, the timer records the sending and receiving time of the signal, and the single chip responds to the interrupt request signal generated by the OR end and executes the external interrupt program.
The STC89C51 single chip microcomputer is also connected with an alarm circuit and a temperature detection circuit;
the ultrasonic transmitting and receiving module is fixedly arranged on the outer side surface of the automobile, and the digital display tube is fixedly arranged on the inner wall of the automobile cab.
In this embodiment, the temperature measurement circuit includes temperature sensor, temperature sensor adopt DS18B20 type temperature sensor, DS18B20 type temperature sensor's GND pin ground, DS18B20 type temperature sensor's VCC pin is connected with +5V power, DS18B20 type temperature sensor's VCC pin still be connected with resistance R2 one end, resistance R2's the other end is connected with DS18B20 type temperature sensor's DQ pin, DS18B20 type temperature sensor's DQ pin still is connected with the P1.1 pin of STC89C51 singlechip, DS18B20 type temperature sensor fixed mounting on the lateral surface of car.
In this embodiment, the alarm circuit includes the speaker, the speaker include two terminals, one of them terminal is connected with the power, the power still be connected with the positive pole of LED diode, the negative pole of LED diode is connected with resistance R6 one end, the other end of resistance R6 is connected with another terminal of speaker, the other end of resistance R6 still is connected with triode Q5's projecting pole, triode Q5's collecting electrode ground connection, triode Q5's base is connected with resistance R20's removal, the other end of resistance R20 is connected with the P1.0 pin of STC89C51 singlechip.
In this embodiment, the speaker and the LED diode are mounted on the inner wall of the cabin of the automobile. The loudspeaker adopts a magnetic buzzer, a 9012PNP type triode is adopted in the triode Q5 in the driving circuit, the low level is effective, and once the measured distance value is smaller than a preset fixed value, P1.0 outputs the low level, the circuit is conducted, and the buzzer can give out an alarm sound. The LED circuit is responsible for the 'light' part in the audible and visual alarm, and when the triode is conducted, the LED circuit is also conducted and can work with the buzzer at the same time.
Above only the utility model discloses an it is preferred embodiment, the utility model discloses a scope of protection not only limits in above-mentioned embodiment, and the all belongs to the utility model discloses a technical scheme under the thinking all belongs to the utility model discloses a scope of protection. It should be noted that, for those skilled in the art, a plurality of modifications and decorations without departing from the principle of the present invention should be considered as the protection scope of the present invention.
Claims (6)
1. The utility model provides an ultrasonic wave radar of backing a car based on singlechip, characterized by: the ultrasonic wave;
the STC89C51 single chip microcomputer is connected with a display circuit, and the display circuit comprises an exclusion resistor, a latch and four one-bit digital display tubes;
the ultrasonic wave transmitting and receiving module is connected to the 89C51 single chip microcomputer, the ultrasonic wave transmitting and receiving module adopts an HC-SR04 ultrasonic wave ranging module, a pulse trigger pin of the HC-SR04 ultrasonic wave ranging module is connected with a P2.2 pin of the STC89C51 single chip microcomputer, an echo pin of the HC-SR04 ultrasonic wave ranging module is connected with a P2.3 pin of the STC89C51 single chip microcomputer, a VCC pin of the HC-SR04 ultrasonic wave ranging module is connected with a +5V power supply, and a GND pin of the HC-SR04 ultrasonic wave ranging module is grounded;
the STC89C51 single chip microcomputer is also connected with an alarm circuit and a temperature detection circuit;
the ultrasonic transmitting and receiving module is fixedly arranged on the outer side surface of the automobile, and the digital display tube is fixedly arranged on the inner wall of the automobile cab.
2. The ultrasonic reversing radar based on the single chip microcomputer according to claim 1, is characterized in that: the temperature measurement circuit include temperature sensor, temperature sensor adopt DS18B20 type temperature sensor, DS18B20 type temperature sensor's GND pin ground connection, DS18B20 type temperature sensor's VCC pin and +5V power connection, DS18B20 type temperature sensor's VCC pin still be connected with resistance R2 one end, resistance R2's the other end is connected with DS18B20 type temperature sensor's DQ pin, DS18B20 type temperature sensor's DQ pin still is connected with the P1.1 pin of STC89C51 singlechip, DS18B20 type temperature sensor fixed mounting on the lateral surface of car.
3. The ultrasonic reversing radar based on the single chip microcomputer according to claim 1, is characterized in that: the alarm circuit comprises a loudspeaker, the loudspeaker comprises two binding posts, one binding post is connected with a power supply, the power supply is further connected with the anode of an LED diode, the cathode of the LED diode is connected with one end of a resistor R6, the other end of the resistor R6 is connected with the other binding post of the loudspeaker, the other end of the resistor R6 is further connected with the emitting electrode of a triode Q5, the collecting electrode of the triode Q5 is grounded, the base of the triode Q5 is movably connected with a resistor R20, and the other end of the resistor R20 is connected with a P1.0 pin of an STC89C51 single chip microcomputer.
4. The ultrasonic reversing radar based on the single chip microcomputer according to claim 3, is characterized in that: the triode Q5 adopts a 9012PNP triode, and the loudspeaker and the LED diode are arranged on the inner wall of the automobile cab.
5. The ultrasonic reversing radar based on the single chip microcomputer according to claim 1, is characterized in that: the latch adopts a 74HC573 type latch, pins D0, D1, D3, D4, D5, D6 and D7 of the 74HC573 type latch are respectively connected with pins P0.0, P0.1, P0.2, P0.3, P0.4, P0.5, P0.6 and P0.7 of an STC89C51 singlechip correspondingly, pins OE, GND and LE of the 74HC573 type latch are grounded, pins VCC of the 74HC573 type latch are connected with a +5V power supply, pins a, b, C, D, e, f, g and dp of four one-bit digital display tubes of the 74HC573 type latch are respectively connected with pins a, b, C, D, e, f and g and dp of the four one-bit digital display tubes, pins VT of the four-bit digital display tubes are respectively connected with the collectors of triodes Q1, Q2, Q3 and Q4, pins Q6 3, Q2, Q2, Q865, resistor 11, resistor 8672, resistor 36R 8672, resistor 8672, 3653 and resistor 8672 are respectively connected with the emitter of the triode Q8472 and resistor 3689R 8672, the other end of the resistor R11 is connected with a pin P2.5 of the STC89C51 single chip microcomputer, the other end of the resistor R12 is connected with a pin P2.6 of the STC89C51 single chip microcomputer, and the other end of the resistor R13 is connected with a pin P2.7 of the STC89C51 single chip microcomputer.
6. The ultrasonic reversing radar based on the single chip microcomputer according to claim 1, is characterized in that: the one-bit digital display tube is a common cathode digital display tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820967473.2U CN210222251U (en) | 2018-06-22 | 2018-06-22 | Ultrasonic reversing radar based on single chip microcomputer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820967473.2U CN210222251U (en) | 2018-06-22 | 2018-06-22 | Ultrasonic reversing radar based on single chip microcomputer |
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| Publication Number | Publication Date |
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| CN210222251U true CN210222251U (en) | 2020-03-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820967473.2U Expired - Fee Related CN210222251U (en) | 2018-06-22 | 2018-06-22 | Ultrasonic reversing radar based on single chip microcomputer |
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| Country | Link |
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| CN (1) | CN210222251U (en) |
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- 2018-06-22 CN CN201820967473.2U patent/CN210222251U/en not_active Expired - Fee Related
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Granted publication date: 20200331 |