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For questions about the HC-SR04 ultrasonic ranging sensor.

4 votes

Ultrasonic distance module works without connecting to gnd

It's not uncommon for part to "sort of" work when one of the supply rails is missing and an input signal of the some polarity somewhat substitutes for it, often through built-in ESD protection diodes. …
Chris Stratton's user avatar
0 votes

Is my HC-SR04 sensor broken?

A major functional difference between the code in your question and the usual ping sensor example is that your code repetitively measures as fast as it or the output stream will allow. In contrast, t …
Chris Stratton's user avatar