I'm pretty sure that this project uses a dsPIC4011. However, I've done some STM32 coding before and I'm not opposed to that processor. It is, indeed, very nice. However, I'm not sure whether a change is in order or not. I suppose that one of the biggest problems would be expecting people to be able to solder 64 pin SMD chips. It's certainly not quite as easy or straight forward as 40 pin through hole microprocessors which is what the current controller uses. It seems to me like the current design is all through hole components.
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