Lesson19- how to use PCF8574 IIC extend GPIO for ESP32 multi relay

KC868-A8 smart controller, many hardware resources for you to use, you can write any code by Arduino IDE to ESP32 wifi/Bluetooth/ethernet module. We will supply demo codes for different samples. Everyone can modify and change the code for their own smart home automation system project.
PCF8574 relay output work with ESP32 arduino IDE source code download:
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