PiFace is designed to plug on to the GPIO of your Raspberry Pi, allowing you to sense and control the real world. With PiFace you can detect the state of a switch, for example from a door sensor, a pressure pad or any number of other switch types. Once this state has been detected, you can 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.
This is an elegant and innovative protective raspberry pi case designed specifically for the Raspberry Pi with PiFace. The case is a two-piece injection-molded ABS enclosure that snaps together around the Raspberry Pi with PiFace. It provides tough protection for the Raspberry Pi Model with PiFace while providing access to connectors.