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4.95 out of 5
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  • 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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  • 24/11/2021

    food seller

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  • 06/11/2021

    These relay modules are great for Arduino easy to use

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  • 26/04/2021

    Perfect!

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  • 26/04/2021

    Perfect!

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  • 26/02/2021

    very good!

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  • 23/01/2021

    OK.

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  • 18/12/2020

    very practical relay system, you can configure different devices without the need for so many circuits

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  • 07/08/2020

    Thank you for the goods, I am very satisfied!

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  • 04/04/2020

    very good

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