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Topic: 1 Channel 5V Relay Module has 4 PINS instead of 3 (Read 143 times) previous topic - next topic


1 Channel 5V Relay Module with Optocoupler .

Purchased from Website https://www.electronicscomp.com/1-channel-5v-relay-module

1 Channel 5V Relay Module with Optocoupler Model:- EC-0977

Relay Module has 4 PINS i.e. V+, G1, G2, IN. Anyone got any idea how to wire this up ?

Attached pic of Relay

Please let me know if you need any other information .

Thank You


Happy to help - as long as you do some work.


Sorry no picture. The fourth lead is probably a seperate power source for the relay. The picture on the web site shows three pins as you indicate.
This response is to help you get started in solving your problem, not solve it for you.
Good Luck & Have Fun!


An opto coupler on a 3-pin relay board is like tits on a bull.

A module with opto coupler MUST have four pins if the opto coupler is to be used.
VCC/GND for the relay coil (separate supply), and IN/GND for the opto LED.

If you don't need opto isolation, then ground the two ground pins to Arduino ground.

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