I forgot to answer your question. Yes you can upload changed code using ISP, and simple serial or parallel to ISP cable. Or using any Atmel compatible ISP programmer.
My MPGUino I've build on my own using Arduino. Good thing is that I can make any changes I need and it's much easier with all the ports available.
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Quote:
Gerhard Plattner: "The best attitude is to consider fuel saving a kind of sport. Everybody who has enough money for a strong car, can drive fast and hit the pedal. But saving fuel requires concentration, self-control and cleverness. It's a challenge with the nice effect of saving you money that you can use for other more important things."
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