SwitchDoc LABS 8 GPIO I2C Extender Breakout Board (Dual Pack) Adds 8 GPIO pins to Raspberry Pi or Arduino. All pins can intterrupt the processor. Two 8 Pin GPIO I2C Breakout Boards Included Two bank power supply allows two banks of GPIO pins to have 5V or 3.3V independently Software drivers provided for Arduino and Raspberry Pi Full Documentation and Software for Raspberry Pi and Arduino on www.switchdoc.com