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I2C controlled, expands 2 signal pins as 16 I/O pins I2C address configurable by shorting the A0/A1/A2 jumpers Provides two connector options: PH2.0 terminal and/or solder pads, allows multi I2C modules to be stacked Onboard voltage translator, compatible with 3.3V/5V level Comes with development resources and manual (examples for Raspberry Pi / micro:bit / Arduino / STM32), wiki: www.waveshare.com/wiki/MCP23017_IO_Expansion_Board