- Operating voltage: 5V-6V DC
- 5 pins: 2 for Coil, 1 common, 1 NO and 1 NC
Relay is an electromagnetic device which is used to isolate two circuits electrically and connect them magnetically. They are very useful devices and allow one circuit to switch another one while they are completely separate. They are often used to interface an electronic circuit (working at a low voltage) to an electrical circuit which works at very high voltage. Their job can be compared to that of a transistor working as a switch but with a difference that relays cannot handle high frequency inputs, unlike transistors.
A relay consists of an electromagnetic coil which, when given proper amount of current and voltage, changes its state from NC to NO. Here’s a look at its pin diagram:
To interface it with a micro controller, you’ll need to amplify the output current from its I/O pins. This can be done with a help of a transistor and make it work like a switch.
- Input voltage: 5-6V
- Input current: 40mA
- Switching voltage and current: 250V(7A) or 120V(10A) AC/ 24V(10A) DC
- Type: SPDT