PID control about repetier-firmware

[repetier]

PID is updated at around 40hz. The next release has a completely change dimplementation with floating numbers for computation and works much smoother. It also has the M303 autotune feature to find best PID values. But please don't try the development version yet. It has a serious bug in path planner which needs to be fixed for production release,

[malx122]

Ok, I will take a look at the code (without using it). A friend was talking about the possibility of maybe using a pure I-regulator with feedforward (lookup table). I will test that on the current version and see how that works.
(With 40 hz, todays (P)ID implementaion is totally broken)

You don't have problem with floating point calculation taking to much calculation power?

[malx122]

I took a look at the new implementation and there is still a few errors if I read the code correctly. (The floating point calculation doesn't fix this). I will send a mail with skype contact information so we can talk :).

[alainm]

Will there be PID for the heated bed? It would be nice if the new PIDs came with an extra one...

In my case, I get a 13°C overshoot with current on/off control (when starting with a cold bed).

[repetier]

Hi,

yes the developement version has pid for heated bed already. SImply use
heat manager 1 for heated bed and set the pid values in the
configuration. The M303 works also for heated bed if you use
P<num_extruder> to select the bed, e.g. M303 P1 S65 if you want bed for
65 degrees.

Yours
Roland

Am 02.11.12 22:06, schrieb Alain Mouette:

Will there be PID for the heated bed? It would be nice if the new PIDs
came with an extra one...

In my case, I get a 13°C overshoot with current on/off control (when
starting with a cold bed).

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