Minimalist user interface for headless Raspberry Pi applications
just finished building a beautifully simple user interface for the Raspberry Pi. The goal was to keep it small and intuitive while still providing a range of functionality. His add-on hardware gives feedback using several LEDs and a four-line character LCD screen. It provides control using just four momentary press switches.
The base for the add-on hardware is a chunk of protoboard the same size as the Pi itself.