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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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Waveshare Mcp23017 Io Expansion Board 6pin Cable I2c Interface Expands 16 I/o Pins For Raspberry Pi/micro:bit/arduino/stm32 - Automation Modules - AliExpress
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Amazon.com: Waveshare MCP23017 IO Expansion Board I2C Interface Expands 2 Signal Pins as 16 I/O Pins Compatible with 3.3V and 5V Levels : Electronics
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