Need a bit of help with a Raspberry PI 4 GPIO Glass scales control loop

Thank you for helping me.
And you have my sincerest apologies but i have to stop for tonight.

But!!!!
I seem to have the axis chasing it's own tail trying to get right on the money.
e.g. PID feedback running.

I'll clean up the file which is a horrible mess and post it to you tomorrow.

ok.. so at this point i'm pretty happy

I hope I don't come and confuse things now.
These are the three setups I have used.

1. Standard stepper motor without any feedback (stepgen in velocity mode)
2. Stepper motors with encoders but no feedback engagedIt is safe to run it this way, there should be no oscillations or anything.

3. Stepper motors with feedback engagedOne need to start slowly with a low P and gradually work the parameters until satisfied.

1. is where one should start from. That is the setup generated by the various configuration programs.
2. is to hook up the encoder and see that the encoder part works
3.is to start reducing the follow error by adding feedback.

I’ve had a chance to clean up the hal file and remove duplicates etc. and here’s a copy if anyone holds interest.

The PID control loop is engaged and doing it’s thing (now verified) So this is where i say a huge thank you!!! for all your advice and effort.
I know that for you guys it’s nothing big but i’m immensely happy that this has finally been achieved.

I played around a bit and sort off stabilized the system.
Next up for me i think is drawing a diagram to wrap my head around what actually happened here in detail
And straight after that comes PID tuning.

And no Hakan in my mind you’re not confusing things you’re offering what i perceive to be the best advice i can think off for the next natural step.

@ Chris. As there’s no PM option here on forum.Linuxcnc i setup a temporary email address you can contact me on to settle. (Yagias at minisumo dot dk)

I’ll add a couple of updates as i move along.

And again… Thank you.

You are welcome. I am happy when you are happy. Enjoy your new toy.

Hi!

I've been following this thread as I am aiming towards creating a similar setup with an RPI4 through the GPIOs with linear encoder open loop feedback.

In you final post, you mention there being a copy of the cleaned up hal file, but I cannot find any in the post.

Could you please post it? I would appriciate it greatly as it is a bit hard to follow the exakt changes made in the original files to get it to work.

Thank you in advance and good job om making it work!