Arduino Advent Calendar Day 08 - Buzzer!
Today we're going to use a rock your world with relays!
What is a relay?
A relay module is a switch that we can operate from our Arduino.
Inside the relay, an electromagnet made up of a coil and ferrite material that is used to move the switch to different positions mechanically.
You can use a relay to control your LOW VOLTAGE (less than 12 Volts DC) Christmas lights, by cutting a wire in the string of lights and passing it through the relay.
Enough talking about it let's go and build up the circuit over at guides.littlebird.com.au .