Waveshare MCP23017 IO Expansion Card, Expands 16 I/O Pins

Overview
MCP23017 IO expansion board expands 2 signal pins as 16 I/O pins based on I2C bus, up to 8 MCP23017 IO expansion boards can be used at the same time, providing up to 128 I/O pins, it is compatible with 3.3V and 5V levels.

Characteristics
1. Controlled by I2C, expand 2 signal pins as 16 I/O pins
2. I2C address configurable by shorting jumpers A0 / A1 / A2
3. Provides two connector options: PH2.0 terminal and/or solder pads, allows you to stack multiple I2C modules
4. On-board voltage translator, compatible with 3.3V / 5V level
5. Comes with development resources and manual (examples for Raspberry Pi / micro:bit / Arduino / STM32)

Specifications
1. Working voltage: 5V / 3.3V.
2. Interface: I2C
3. Interrupt pins: INTA, INTB
4. Expansion I/O: 16
5. Size: 38mm × 23mm
6. Mounting hole size: 2.0mm