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Interfacing RELAY with Arduino UNO

What is Relay?

Relay is an automatic switch that detects condition in circuits and causes the contacts to change their positions to close or open the circuit as required. Relays are used in many applications. When the coil of relay is energized or de-energized, its contacts are ON or Off.

In a relay we have to consider two important parameters i.e. once is the Trigger Voltage, this is the voltage required to turn on the relay that is to change the contact from Common->NC to Common->NO. Our relay here has 5V trigger voltage.

 


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Interfacing RELAY with Arduino UNO

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