Ultrasonic distance measurement alarm system peripheral circuit diagram-EEWORLD

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　　The figure below is the schematic diagram of the peripheral circuit of the ranging alarm system. The peripheral circuit of the system includes power supply, reset, crystal oscillator, temperature measurement, alarm, serial port and digital tube display circuit, etc.

　　The clock frequency of PIC16F877A is 4MHz~20MHz. On the basis of ensuring the accuracy of system calculation, an 8MHz crystal oscillator is used, which makes it easy to set the number of ultrasonic waves to be emitted, so that the center frequency of the ultrasonic wave is maintained at 40KHz. The DS18B20 chip used can correct the sound speed to make the result more accurate. The system uses a buzzer for alarm. The serial port circuit can communicate with the host computer. In order to facilitate observation, a digital tube is used to display the measured distance. The RD0~RD7 of the PIC microcontroller controls the seven-bit segment selection of the digital tube, and the RC1~RC3 controls the bit selection, and the distance is displayed in a dynamic scanning manner.

　　 Figure 6 Peripheral circuit of ultrasonic ranging alarm system

　　Figure 1. Ultrasonic distance measurement alarm system peripheral circuit

Reference address：Ultrasonic distance measurement alarm system peripheral circuit diagram

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