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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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IO Expansion
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GitHub - rpsreal/MCP23017_I2C-with-Raspberry-Pi-: Python library to control the MCP23017 GPIO
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GitHub - sensorberg/MCP23017-python: MCP23017 GPIO-Expander Python Library for RaspberryPi
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