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!

Item conforme descrito e esperado. Entrega rápida e serviço da Banggood :)

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

Item conforme descrito e esperado. Entrega rápida e serviço da Banggood :)

Vendedor de alimentos

food seller

Vendedor de alimentos

Esses módulos de retransmissão são ótimos para o Arduino fácil de usar

These relay modules are great for Arduino easy to use

Esses módulos de retransmissão são ótimos para o Arduino fácil de usar

Perfeito!

Perfect!

Perfeito!

Perfeito!

Perfect!

Perfeito!

muito bom!

very good!

muito bom!

Está bem. - Está bem.

OK.

Está bem. - Está bem.

sistema de retransmissão muito prático, você pode configurar dispositivos diferentes sem a necessidade de tantos circuitos

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

sistema de retransmissão muito prático, você pode configurar dispositivos diferentes sem a necessidade de tantos circuitos

Obrigado pelos bens, estou muito satisfeito!

Thank you for the goods, I am very satisfied!

Obrigado pelos bens, estou muito satisfeito!