Description
If you want to add a whole lot of buttons, LEDs, digital sensors, you name it, then this shield will give you the extra pins.
The outputs can directly power small LEDs, sensors etc, or can be connected to MOSFETs or relays for higher powered applications.
The input/output data is communicated to the 3DoT through I2C
Compatible with the Adafruit MCP23008 library found in the Arduino Library manager.