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-   -   PID Loop (http://www.chiefdelphi.com/forums/showthread.php?t=116946)

dheerm 17-05-2013 20:59

PID Loop
 
Could anyone provide us with an 8-inch PID loop?

I always here about how awesome PID loops are and was hoping someone could help us obtain one :)





























(Don't get mad, just joking around :D)

vishnum 17-05-2013 22:21

Re: PID Loop
 
I think an 8 inch PID loop will be more than the $400 limit per part.

androb4 17-05-2013 22:39

Re: PID Loop
 
Quote:

Originally Posted by vishnum (Post 1275694)
I think an 8 inch PID loop will be more than the $400 limit per part.

Don't forget about the perimeter rule.

efoote868 17-05-2013 23:10

Re: PID Loop
 
What is this, I don't even

mman1506 18-05-2013 01:09

Re: PID Loop
 
I don't think they have PID loop in that size. Try using a PI loop, I heard it's a lot cheaper when they remove the derivative.

Roger 18-05-2013 05:52

Re: PID Loop
 
Metric is easier

androb4 18-05-2013 09:07

Re: PID Loop
 
Maybe try an 8 dB wide PID loop.

ykarkason 18-05-2013 11:55

Re: PID Loop
 
I can loan you a 20 centimeter PD loop, if that's any good.

Greg McKaskle 18-05-2013 12:23

Re: PID Loop
 
1 Attachment(s)
The one I attached is a bit wide, but maybe you can tweak the DPI.

Greg McKaskle

jwallace15 18-05-2013 12:26

Re: PID Loop
 
I wish I could even understand how a PID loop works! Someone tried explaining it to me but I still don't understand...

Also, is it just something for LabView, or does it work in other languages as well (in particular, Arduino Sketch)?

Ginto8 18-05-2013 12:50

Re: PID Loop
 
Quote:

Originally Posted by jwallace15 (Post 1275771)
I wish I could even understand how a PID loop works! Someone tried explaining it to me but I still don't understand...

Also, is it just something for LabView, or does it work in other languages as well (in particular, Arduino Sketch)?

It's possible to implement a PID loop in any language. As for understanding how it works, I suggest PID Without a PhD.

Greg McKaskle 18-05-2013 12:51

Re: PID Loop
 
PID is not a LabVIEW thing. It is a robust control algorithm that uses several mathematical terms based on proportional response, longer-term error accumulation, and how the current error compares to previous values.

LV does have an example called General PID Simulator that may be helpful to experiment with. It has a parameterized plant that allows you to model real-world elements and practice tuning them. But the model portion is pretty academic and not that approachable. Still, it allows you to experiment with typical tuning issues and identify the symptoms in the chart.

Greg McKaskle

Pault 18-05-2013 12:59

Re: PID Loop
 
Quote:

Originally Posted by jwallace15 (Post 1275771)
I wish I could even understand how a PID loop works! Someone tried explaining it to me but I still don't understand...

Also, is it just something for LabView, or does it work in other languages as well (in particular, Arduino Sketch)?

Search is your friend.

http://www.chiefdelphi.com/forums/sh...&highlight=Pid

Also, it is used in other languages. My team uses JAVA, and we used PID a lot this year. As for Arduino Sketch, I think you should be able to, because it is just a bunch of math, but I do not know what google sketch is nor am I a programmer, so you might want to take my word with a grain of salt. :rolleyes:

Domenic Rodriguez 18-05-2013 13:09

Re: PID Loop
 
Quote:

Originally Posted by Ginto8 (Post 1275776)
It's possible to implement a PID loop in any language. As for understanding how it works, I suggest PID Without a PhD.

+1 for PID Without a PhD. Also, this article gives a good explanation of a PID controller with a practical example: an NXT based line-following robot. It's targeted towards FLL aged kids, but still some good info.

SenorZ 18-05-2013 14:16

Re: PID Loop
 
Maybe they'll include them in he KOP next year. Having to make our own PIDs was very stressful this year. :cool:


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