Okay, I'm sure there's some procedural way to do this, but I've not =20 found the full details on it yet, and from my limited experience =20 tuning P&I for a quad-copter, this can be a tedious experience, for =20 which I really don't have the time currently. Hence autotune, even if =20 it comes at a price. Cheers, -Neil. Quoting AK <00@case.edu>: > You can derive PID parameters by looking at a step response of the > system, this is how I've read autotune units do it. Proportional > control variable is self explanatory, and then the I and D parameters > can be sussed out by looking at the slope and overshoot (if any) of > the response curve. > > On Thu, Sep 1, 2011 at 6:35 PM, PICdude wrote: >> PID does not seem difficult (and I found much info on it on the net), >> but tuning is apparently a black art. =A0I don't know where to begin >> with autotuning, but I suspect it would be some iterative process that >> tweaks the P/I/D constants and determining how quickly it reaches the >> target temp, and how much it drifts over time. >> >> If anyone here knows anything about autotuning, I'd love to be enlighten= ed. >> >> Cheers, >> -Neil. >> >> >> >> Quoting alan.b.pearce@stfc.ac.uk: >> >>> I would suggest you check the libraries that Microchip have for the >>> dsPic devices, I have a feeling there is a PID library in there, but >>> I haven't checked. >>> >>> Other than that actual PID code seems simple enough. I suspect it is >>> the auto-tuning part that is the hard part. >>> >>> >>> >>> >>> -- >>> Scanned by iCritical. >>> >>> -- >>> http://www.piclist.com PIC/SX FAQ & list archive >>> View/change your membership options at >>> http://mailman.mit.edu/mailman/listinfo/piclist >>> >> >> >> >> -- >> http://www.piclist.com PIC/SX FAQ & list archive >> View/change your membership options at >> http://mailman.mit.edu/mailman/listinfo/piclist >> > > -- > http://www.piclist.com PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .