Difference: Ultra-sonicSensor (2 vs. 3)

Revision 32018-03-06 - UliRaich

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META TOPICPARENT	name="WebHome"

The Ultrasonic Distance Sensor HC-SR04

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Echo

The module is triggered with a 10us TTL trigger pulse. It then sends an 8 cycle sonic burst of 40 kHz and tries to detect the echo. The module sends an echo pulse whose length is proportional to the time the sound signals takes to the target and back.

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Here is a Python test program demonstrating the readout:

https://afnog.iotworkshop.africa/pub/AFNOG/Ultra-sonicSensor/hc-sr04.py.txt

Uli Raich - 2018-02-08

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