Thanks! I looked into the code and it generally looks similar to my
pseudo-PI approach (preloading PWM to some value and then simply ++ or --
if output is too high or too low). I had troubles with slow response, but I
think that it was because how analogRead is handled on STM32 hacked to work
Ian Sparkes’ kits use the microcontroller https://www.nixieclock.biz/Store.html
. The source code is on Github.
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I'm actually using a CPLD (FPGA) for my next project, because the attached
RasPi is running Linux and does not have guaranteed response time. It's too
risky to have logic controlling something critical, like a DCDC converter,
if the behavior is not deterministic at all times. Leaving a
