Pi-Face is compatible with Raspberry Pi Model A/B. Pi-Face Digital plugs directly onto the top of your Raspberry Pi and allows you to sense and control the real world. Detect switch states for example from a door sensor a pressure pad or any number of other switch types. Then write your own software for Raspberry Pi that determines how to respond to that switch state. You can drive outputs to power motors actuators LEDs or anything you can imagine. - Plugs directly onto Raspberry Pi GPIO socket - 2 changeover relays - 4 tactile swtiches - 8 digital inputs - 8 open-collector outputs - 8 LED indicators - Easy to program in Python Scratch and C - Graphical emulator and simulator