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Well, after spending the afternoon farting around with PWM on the Raspberry-Pi, I got the variable fan speed working, however I discovered that the fan motor was overheating my servo driver, and slowing the fan down even a bit really made the heating coils glow red.
Yep, you can't control one without the other. You'd need to ensure that heater output was maintained within an acceptable range, either by cascading air flow and thermal output together or setting thermal output limits to the air reaching the bean mass. The fun is in working it all out...
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