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!

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!

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!

Prodotto come descritto e atteso. Consegna veloce e servizio da Banggood :)

Item as deItem as described and expected. Fast delivery and service from Banggood :) Thanks

Prodotto come descritto e atteso. Consegna veloce e servizio da Banggood :)

venditore di alimenti

food seller

venditore di alimenti

Questi moduli del relè sono grandi per Arduino facile da usare

These relay modules are great for Arduino easy to use

Questi moduli del relè sono grandi per Arduino facile da usare

Perfetto!

Perfect!

Perfetto!

Perfetto!

Perfect!

Perfetto!

Molto bene!

very good!

Molto bene!

Va bene. Ok.

OK.

Va bene. Ok.

sistema di relè molto pratico, è possibile configurare diversi dispositivi senza la necessità di tanti circuiti

muy práctico sistema de relay, podre configurar diferentes dispositivos sin necesidad de tantos circuitos

sistema di relè molto pratico, è possibile configurare diversi dispositivi senza la necessità di tanti circuiti

Grazie per la merce, sono molto soddisfatto!

Thank you for the goods, I am very satisfied!

Grazie per la merce, sono molto soddisfatto!