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Module Operator Principle:
Connection mode, VCC, trig (control), echo (receiving end), GND ground wire.
Pull the Trig pin to high level for more than 10us impulse.
The module automatically send eight 40khz square wave and automatically detect whether receive the returning pulse signal.
If there is signals returning, through outputting high level and the time of high level continuing is the time of that from the ultrasonic transmitting to receiving.
Test distance = (high level time x sound velocity (340M/S)/2.
Note:
1. This module should not be directly connected with power. If you want to connect with power, you need to connect the GND pin of the module at the first, otherwise it will affect the normal operation of the module.
2. When measuring distance, the measured object should be no less than 0.5 square meters and the plane should be flat as much as possible, otherwise the measurement result will be affected.