A. Dumas  wrote:
> Theo  wrote:
> > There's a variety of firmware for running such controllers on Arduino and
> > similar, doing closed loop control.
>
> ###>>>>> "as this is Raspberry newsgroup" <<<<<###

Yes, and?  You attach the Arduino to the Pi and communicate over USB or
serial (subject to voltage levels).  You don't want to do realtime control
on a Pi running Linux, but a $3 Arduino is a suitable coprocessor for the job.

Theo

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