This paper introduces an ultrasonic wireless distance measuring system for car reversing collision avoidance. The system consists of two parts: the lower computer and the upper computer. The lower computer is mainly composed of ultrasonic transmitting circuit, ultrasonic receiving circuit, wireless transceiver module and single chip microcomputer. The upper computer is composed of single chip microcomputer, wireless transceiver module and display circuit, and the lower computer and the upper computer. The information is transmitted through the wireless transceiver module. In this paper, the design method of ultrasonic ranging circuit is analyzed, and the design idea of ​​using wireless communication technology to realize remote data transmission is described. The system measures distance conveniently, flexibly and stably.
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