“The Mignon Game Kit is a kitset which enables a minimalist Gameboy to be individually designed, programmed and constructed. Workshops and online instructions enable advanced learners to invent and programme their own games. In this way the do-it-yourself console of the “Mignon Game Kit” provides not only the opportunity for basic experiments with micro-electronics for [...]

Wiring is a programming environment and electronics i/o board for exploring the electronic arts, tangible media, teaching and learning computer programming and prototyping with electronics. It illustrates the concept of programming with electronics and the physical realm of hardware control which are necessary to explore physical interaction design and tangible media aspects.
The Wiring interface board [...]

Something I’ve been looking at a lot lately is taking external input via sensors into Max/MSP or Processing for installation work. This will enable me to completely hide any kind of computer interface and use light sensors, touch sensors etc, to affect the audio and visuals of a space.
I have looked at hacking MIDI devices [...]