Recommended · for beginners
Use Arduino to Switch Power On and Off!
Why people recommend it
A beginner relay tutorial showing an Arduino switching power to a load, though one commenter questions driving the relay straight from a pin.
Watch for: Whether the relay needs a driver transistor
In their words
I am using relays because from what I have seen (Use Arduino to Switch Power On and Off!) relays are controlled swiches and I am using SSR because I want to use the less space possible.
Paiku Han on arduino.stackexchange.com, Mar 2015. CC BY-SA.
