Raspberry Pi HAT - 32 I/O Port Expander - MCP23017 - I2C - Black
[Product Information]
32 Digital Inputs/Outputs, based on the Microchip MCP23017 chip
Control via the Raspberry Pi I2C port, selectable I2C addresses thru switches
Stackable, up to 4 boards per Raspberry Pi, right angled headers for ease connection when stacked
All I/Os are 5V tolerant, built in 3.3V to 5V shifter for Raspberry Pi I2C port protection
Raspberry Pi can be Back Powered or isolated thru a jumper, The board can be powered thru the Raspberry Pi GPIO 5V pins, or thru a 5V polarized input header from an external supply