From the submitter: I bought this microwave oven for R$ 20 to fix it and use. Unfortunately, it is IMPOSSIBLE to find the keyboard membrane in Brazil. In USA, just the membrane costs $80!!! So I traced the keyboard circuit and made a new keyboard for it :)
3 U Penn students developed the µWave (microwave, get it?), an Arduino based kitchen hack that plays Youtube videos while you wait for noms. Once you set the cooking time the program goes to Youtube and finds a highly-rated video for the exact length. Read more about it at the project's website.