Microcontroller: Explain the timing of ultrasonic wave casually. some

This is a complete set of test signals. The trigger signal tells you to start the test, and the signal is sent out as detection energy. The echo signal is the result of the received signal.

As a system, it will continuously transmit several groups of such signals and display the average results of the received signals, so that several groups will work continuously as a unit in the system and the data will be continuously updated.