The ultrasonic module is connected with the microcontroller to measure the distance. The principle of ultrasonic ranging is that the ultrasonic device emits ultrasonic wave, which is based on the time difference between the receiver and the ultrasonic wave, which is similar to the principle of the radar ranging. The ultrasonic transmitter launches an ultrasonic wave in a certain direction, and starts the time at the time of the launch. The ultrasonic wave propagates in the air, and immediately meets the obstacle on the way, and the ultrasonic receiver stops the time immediately after receiving the reflected wave.

超声波测距.c

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