[FluidNC Issue#1416] Feature: Dimmer support for AC motors

#1 – MitchBradley 于 2024-12-29

> And why should there be two micros in one machine doing the same job.

Because the FluidNC code is already bloated with features that only a small number of people use. The developers are overwhelmed with support requests from people who rarely donate to help up defray our costs. Developing code for and supporting hardware that we do not have is especially difficult. Delegating code for rarely-used hardware to an external MCU makes it clear that it is Somebody Else’s Problem.

#2 – bdring 于 2024-12-29

Micros are super low cost these days. All VFDs and most speed controllers have a microprocessor.

#3 – bdring 于 2024-12-29

Try this.

https://cnc4pc.com/c47-a-c-speed-controller-relay-board.html?srsltid=AfmBOopa8IycqV3-UcJEXftEA0w50a-QCj47uwlDS5XMO3AZf00fIJ

Or this.

https://vhipe.com/

Dimmers chop the power, so they get very weak at slower speeds. The Superpid is closed loop, so it maintains power at slower speeds.

Both have dangerous exposed voltages.

#4 – VeryFastSnail 于 2024-12-30

> > And why should there be two micros in one machine doing the same job.
>
> Because the FluidNC code is already bloated with features that only a small number of people use. The developers are overwhelmed with support requests from people who rarely donate to help up defray our costs. Developing code for and supporting hardware that we do not have is especially difficult. Delegating code for rarely-used hardware to an external MCU makes it clear that it is Somebody Else’s Problem.

Sounds right, in this case I will make all code available with tutorial how to have it setup in fluidnc so others can recreate. Even if there are only few people who will use it.

#5 – VeryFastSnail 于 2024-12-30

> Try this.
>
> https://cnc4pc.com/c47-a-c-speed-controller-relay-board.html?srsltid=AfmBOopa8IycqV3-UcJEXftEA0w50a-QCj47uwlDS5XMO3AZf00fIJ
>
> Or this.
>
> https://vhipe.com/
>
> Dimmers chop the power, so they get very weak at slower speeds. The Superpid is closed loop, so it maintains power at slower speeds.
>
> Both have dangerous exposed voltages.

I already have this solved with external micro, the only thing I want now is to have really stable PWM control in noisy environment, since brushed motors create EM radiation.

Thanks for the information. Will take a look