Waveshare MCP23017 IO Expansion Board I2C Interface Expands 16 I/O Pins Compatible with Both 3.3V and 5V Levels

The MCP23017 IO Expansion Board expands 2 signal pins as 16 I/O pins based on the I2C bus, up to 8 MCP23017 IO Expansion Board can be used at the same time, providing up to 128 I/O pins, it is compatible with both 3.3V and 5V levels 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)