Questions tagged [hc-sr04]

For questions about the HC-SR04 ultrasonic ranging sensor.

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How to make battery last for months?

I have a simple circuit: detect that a person is walking towards the circuit (with HC-SR04), measure distance, light diodes (a wave effect) according to that distance – the closer, the faster the led ...
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Interference in readings

I have an project which control a heat exchanger. I read 4 temperature sensors DS18B20, a distance with HC-SR04 Ultrasonic Sensor, and a flow with YF-S201 (with attach interrupt). I can turn on and ...