I was thinking to build PWM for fan control in Berta, but have other more important things to finish before I'll start working on that. But I have some experience with electronics so I can help you.
I was thinking ATMega or ATTiny with two DS18B20 and all you need is high current end of the unit.
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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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