Hello, I need to use a Opto Coupler between the Arduino Uno and a Interface of the Domotica system RX-TX pins So i want to put the Arduino on his own power supply and cannot connect the GND of the Arduino with the GND of the domotica interface. So i am looking for a working schematic so that i ca…

Need Opto Coupler between RX-TX because interface use different voltage

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