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MCP23017(SG-IO-E017) IO port expander module adopts I2C interface, less pin occupation MCP23017 breakout board onboard 3-digit DIP switch is convenient for users to set I2C address Compatible with 3.3V/5V working level PH2.0 interface and 2.54mm spacing pad reserved for easy access to other development boards We provide open source demo codes for Raspberry Pi, Ardui. and STM32 development boards