This is a machine in 8051 ultrasonic ranging process. Working principle: the transmitter plus a 8- 15us' s high, and then start the timer at the receiving end, when the receiver is high, ultrasound propagation in the air some time to return the receiver, the receiver receives a falling, this process is the transmission time of ultrasound, using the following formula can measure the physical distance from the object to the distance measuring module

ul_Main.c

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