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!

商品は説明通りであり予想通りでした。Banggoodから迅速な配送とサービス：）

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

商品は説明通りであり予想通りでした。Banggoodから迅速な配送とサービス：）

食品売り手

food seller

食品売り手

これらのリレーモジュールは、Arduinoの使いやすい機能に最適です

These relay modules are great for Arduino easy to use

これらのリレーモジュールは、Arduinoの使いやすい機能に最適です

完ぺきですね!

Perfect!

完ぺきですね!

完ぺきですね!

Perfect!

完ぺきですね!

非常にいいです!

very good!

非常にいいです!

わかりました。

OK.

わかりました。

非常に実用的なリレーシステムにより、非常に多くの回路を必要とせずに異なるデバイスを設定できます

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

非常に実用的なリレーシステムにより、非常に多くの回路を必要とせずに異なるデバイスを設定できます

ありがとうございました商品、私は非常に満足!

Thank you for the goods, I am very satisfied!

ありがとうございました商品、私は非常に満足!