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
I2C – ECE353: Introduction to Microprocessor Systems – UW–Madison
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sensors - Connecting two Arduinos via I2C while I2C Pins A4/A5 are already in use - Arduino Stack Exchange
How to use I2C on nRF52840 Dongle ? - Nordic Q&A - Nordic DevZone - Nordic DevZone
How to wire I2C address pins (A0, A1, A2, ...)? - TechOverflow
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microcontroller - Can SPI and I2C be implemented using GPIO pins? - Electrical Engineering Stack Exchange
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