![gpio - rPi model B + MCP23017 + relay board. GPA0 pin low output not close enough to 0v to trigger relay - Raspberry Pi Stack Exchange gpio - rPi model B + MCP23017 + relay board. GPA0 pin low output not close enough to 0v to trigger relay - Raspberry Pi Stack Exchange](https://i.stack.imgur.com/AFQYU.jpg)
gpio - rPi model B + MCP23017 + relay board. GPA0 pin low output not close enough to 0v to trigger relay - Raspberry Pi Stack Exchange
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Amazon.com: CQRobot Ocean: MCP23017 IO Expansion Board Compatible with Raspberry Pi/Micro:bit/Arduino/STM32 Motherboard. I2C Interface, Expands 16 I/O Pins, Up to 8 Expansion Boards Can be Used Simultaneously. : Electronics
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