Robert ... I really don't see that. dP/dt (i.e. velocity) is self-perpetuating - hence momentum. Momentum gives rise to overshoot in a P controller. dV/dt...
Peter Balch
peterbalch@...
May 1, 2008 9:33 am
36069
... I would like to thank you on behalf of all of us acronymically challenged readers for expanding that one. If I could make a request of the other members of...
From: <silverfish_21@...> ... That's neat but why did you do it? It sounds like you're using the "opposite P" term to improve directional stability....
Peter Balch
peterbalch@...
May 1, 2008 10:01 am
36073
Peter and Group, I'll sprinkle responses in below. To be clear, I am not experiencing trouble that can't be fixed. At issue are oscillations that tend to be ...
There is surprisingly little information on how to control both the left and right wheels together. Not just in the hobbyist articles, but in the academic...
William Crolley
w.crolley@...
May 1, 2008 2:23 pm
36075
OK, here is another way of implementing speed and direction control which I've had very good luck with. I control each wheel to a distance command. A high...
Alex ... Is that really a PID controller? The only feedback seems to be in the DistanceError term. The current speed or acceleration don't figure in your...
Peter Balch
peterbalch@...
May 1, 2008 6:47 pm
36077
Alex & Peter, Thank you for taking the time to respond, the data assesment as well as the thought processes you are inspiring at this end are imensly valuable...
... Ah, there is the correct thing to be asking. Why use a PID on a robot. In many cases, it is overkill. In some cases, it is very difficult to implement ...
From: "Kevin Ross" <kevinro@...> ... When I first saw your list, I was convinced you were right but then I started to consider each one in detail. (To...
Peter Balch
peterbalch@...
May 2, 2008 10:47 am
36081
From: <silverfish_21@...> ... What does the I term do for you? In what way does it make things better for a mobile robot speed controller? Peter...
Peter Balch
peterbalch@...
May 2, 2008 11:02 am
36082
... Ah, there is the correct thing to be asking. Why use a PID on a robot. In many cases, it is overkill. In some cases, it is very difficult to implement ...
... Ah, there is the correct thing to be asking. Why use a PID on a robot. In many cases, it is overkill. In some cases, it is very difficult to implement ...
Peter (and Kevin from subsequent posting) You are correct, it is a "P" controller with two feed-forward terms. I was responding to the original poster's...
The primary purpose of the 'I' term is to drive the steady-state error to zero. The steady-state error is the error in the process variable (velocity,...
Note that in most cases, you want some overshoot. By allowing for some overshoot, you can obtain a faster transient response than is possible in a system with...
There has been a little bit of LabView discussions going on here so I thought I might pass this email on in case anyone wanted to take advantage. ... JIMc ...
I posted 3 small D&M CNC machines for sale on Craigslist this morning. All run on 110v and have enclosed cabinets, so they'd work well in a small home shop. ...
Is it possible to post your presentation to the files section? Yahoo Groups seems to have stripped it off and I could use all the help I can get with ...
This is my first build so I need something simple but I would like to spend a little extra now so I can use the brain on my next few projects as I learn. Also...
Here is a simulator of PID that can be helpful. See http://liorelazary.com/Robotics/robot_pid_simulators.htm There is an exe you can download which lets you...
sorry but your post is a bit too general. it is like asking what car is the best. the answer depends on too many things. I can say that there are many...
Everyone asks those two questions: http://www.societyofrobots.com/robot_faq.shtml#best_microcontroller ...
John Palmisano
palmisano@...
May 2, 2008 9:36 pm
36095
... Totally depends. How comfortable are you with embedded programming? If you are a newcomer to the art then I'd suggest the Parallax Stamp until you get...
Doug, Thanks for the link. I'm playing with the simulator now and it is much easier to visualize the affects of each tuning parameter this way. Take care, ...
From: "Kevin Ross" <kevinro@...> You seem to be referring to any mismatch between desired and actual speed as "overshoot". I'm simply referring to what is...
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