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SR800/SR540 Fan Current TC4+
It is more than fast enough.
Such things are done with Arduino Uno for more than 10 years (see TC4 project), and Uno is 10x less capable than an ESP32.
Just a thing to be aware, if using WiFi some timers and ADC logic are disturbed, so better use BT (BLE) for wireless comm, if you intend.
Roaster is working pretty well now. This roast was outside in a mild breeze and includes me reducing the fan from 60% to 35% in ~5% steps. I made a modification to the integral equation. I don't allow the integral to change if the error term is getting smaller. This prevents the integral from winding up when the error is large but headed in the right direction. The change got rid of the large overshoots.
dwertz attached the following image:

Edited by dwertz on 02/21/2023 3:12 AM
I read through this entire thread and Iím amazing what you all have done. It sounds like you have in depth knowledge of how the Fresh Roast works. I have a couple questions. Iím new to roasting but a long time tinkerer. Iím using the SR540 w/ext tube and also getting frustrated with the stock control limitations. I donít have the controls experience to do what you all have done, but as the OP discussed to start this thread, my inclination is that a separate manual fan control would give much better control.

1) Do you think a separate manual fan control is at all possible and would be a good 90% solution?

2) Do you know how this could be done? Would it need a different fan because of how the fan is powered?
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