Top Positive Review for Relay,Power Supply Module on Banggood SEA|Shopping Southeast Asia

DC12V 4 Channel Level Trigger Optocoupler Relay Module Power Supply Module US$7.49 US$6.99 View It

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Edje 04/05/2019

It's an "optocoupler" relay module operating at 12 Volt. Does this mean that 12 V is galvanic isolated from the arduino, that should control the relays? My first impression was: I am missing a separate ground for the relay control and for the arduino! However, after some study I discovered that you CAN operate the board with galvanic isolated 12 V and the arduino's 5 V. How? Don't use the straps!! So don't connect the 4 middle pins with straps to Ground or to VCC of the relay module, but connect these 4 pins to the arduino's ground! Now the 12V and the arduino's 5V are galvanic isolated! See photo!

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