PiFace Digital I/O Expander 

PiFace Digital I/O Expander  info

PiFace Digital Expansion board allows your Raspberry Pi to hook up to all kinds of controls and sensors.

PiFace Digital plugs directly into the GPIO port on your Raspberry Pi and adds a whole load of input and output capability. You can detect switch states, drive motors, move actuators, blink LEDs… Program it any way you want but there’s existing documentation for Python and Scratch. All of the input and output connectors are screw terminals, making it really easy to wire your Pi to all kinds of external systems. If you want to get an interactive project off the ground quickly with Raspberry Pi, the PiFace Digital is a great way to start.

Note: Though PiFace is electronically compatible with the Raspberry Pi B+, the Raspberry Pi 2, and the Raspberry Pi 3, it can NOT physically stack on top of them.

PiFace Digital I/O Expander - General Specifications

• Plugs directly onto the Raspberry Pi GPIO socket
• Fits Directly over the Raspberry Pi and within the Raspberry Pi’s footprint
• 2 Changeover Relays
• 4 Tactile Switches
• 8 Digital Inputs
• 8 Open-Collector Outputs
• 8 LED Indicators
• Easy to program in Python, Scratch and C
• Graphical Emulator and Simulator
• Relays can be used to switch voltages up to 20V (Max) or currents up to 5A (Max)

Documents

Code Repository: https://github.com/thomasmacpherson/piface

References

PiFace Web Site: http://www.piface.org.uk/