The easiest and safest way to detect mains electricity using a microcontroller is with an optocoupler as it allows us to send data between two galvanically isolated circuits ... It uses a dedicated ...

This compact mains voltage sensor is intended to monitor and signal to another circuit, for instance a microcontroller, about the presence and/or absence of the ac mains voltage. For this task, a ...

You can see the circuits in the video below. A contactless probe picks up the changing magnetic field around an unshielded wire with an AC voltage on it. Current doesn’t have to be flowing since ...