1 Control High Voltage Devices – Arduino Relay Tutorial
How To Mechatronics explains how to control a relay module from an Arduino, offered to people switching mains loads, though one commenter later preferred another resource.
Topic
mains switching
5 videos. Ranked by independent recommendations, not by views.
2 Raspberry Pi - (Relay) Controlling mains electric
A Raspberry Pi demonstration of switching a mains lamp through a relay board, recommended as a clear explanation for anyone wanting to drive bigger loads from GPIO.
3 120/240V to logic level optoisolator (with schematic)
Big Clive's in-depth look at a single-channel optoisolator module, suggested for switching a mains load such as a pump and for learning how these boards work.
4 Automatic generator changeover switch (with schematic).
Cited as a look at a ready-made automatic transfer switch for changing between mains and generator, and as an example of the usual approach.
5 How to use 5V Relay with Arduino to turn ON and OFF AC bulb or DC load
Offered as a tutorial for switching a light bulb with a relay from an Arduino, suited to people moving on from practising with LEDs.
