Ultrasonic Ranging module HC-SR04

Testing the HC-SR04 to measuring distances

View attachment 43218

The accuraccy of the sensor depends greatly on device (chinese, cheap, etc..); in code, I limited the measurement between 3 cm and 100 cm (probably your device can measure larger distance)

Thanks to inline C code, I've used the PulseIn...

Ultrasonic Ranging module HC-SR04

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