/* Relay IN1 connected to Pinout 2 Arduino Relay IN2 connected to Pinout 3 Arduino Relay IN3 connected to Pinout 4 Arduino Relay IN4 connected to Pinout 5 Arduino --->you can connected to relay modul 4 channel Serial data sending from Arduino Bluetooth Relay 4CH.apk data '1'-'4' to on is Rela…

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