Continuing with our Growduino project we go over what relays are and why we need them and begin the basics of coding your Arduino so you can remotely access or schedule automation!Relays! * A relay is a switch that is toggled electrically ** It gives us the ability to turn on and off a circuit with a different circuit -- So a 120AC circuit could toggle a 12V DC circuit -- A 5V circuit could toggle a 24V circuit There are several different TYPES of Relays -- Electromagnetic (the most popular) -- Optomechanical (Much like EM, but the circuits are COMPLETELY isolated from each other) -- Solid State (No moving parts. All switching is done in a semiconductor) We're going to be using electromagnetic Relays * In the most basic version: a switch is toggled between "on" and "off" by an electromagnetic that physically moves the switch between the two positions uxcell HH54P D 12V Coil Relay
