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Don't need anything real time for my heating I suppose? It's just an on/off signal to control the boiler AFAIK...
The other project is a little MIDI keyboard that I can play with my feet. Basically what this guy has:
I was disassembling children's keyboards for a while before I realised I could just dump some pre-written MIDI control stuff onto an Arduino and just connect the buttons up
frankenbike
The one caution with a pi is that anything that needs true real-time processing isn't possible, there's no way to stop the os doing it's thing with it's scheduler. It's mostly probably kinda fine for most home projects though, you can always deal with a little delay.
What was the 4 year ago project? I started uni with all the enthusiasm in the world for projects like this but it wore thin pretty quick when it was the day job too.