Relay¶
Electromagnetic switch
Working principle: Electromagnetic induction
Be careful when working with relays, as they may short-circuit. Donāt touch the back side and donāt keep it near other conductors and electronics
Pins¶
- VCC: +5v
- GND
- IN: Input (D2)
- NC: Normally-closed/connected
- NO: Normally-open
- COM: Common
Internal connections
- NC & COM with spring
- NO & IN
| IN | NO | NC - COM | NO - COM |
|---|---|---|---|
| On | Behaves like a magnet | Break | Attracted |
| Off | No effect | Revert Makes a ātick-tickā sound | Break |
If there is no ātick-tickā sound, then the relay isnāt getting sufficient voltage