Relay Module Reference
Electrically operated switch
Pin names
Name | Description |
---|---|
VCC | Supply voltage |
GND | Ground |
IN | Control signal (e.g. from micro-controller) |
NC | Normally closed |
COM | Common pin |
NO | Normally open |
Operation
The relay is an electronic switch.
When the IN
pin is low / disconnected, COM
is connected to NC
(NC means normally closed).
When the IN
pin is high, COM
is connected to NO
(NO means normally open).