Comments for Project Blog http://brettbeauregard.com/blog Project updates and... um... Thu, 17 May 2012 16:16:54 +0000 hourly 1 http://wordpress.org/?v=3.3.2 Comment on Improving the Beginner’s PID: Direction by Tom http://brettbeauregard.com/blog/2011/04/improving-the-beginners-pid-direction/comment-page-2/#comment-49016 Tom Thu, 17 May 2012 16:16:54 +0000 http://brettbeauregard.com/blog/?p=1187#comment-49016 Just to say, yes the advanced topics are of interest! Just to say, yes the advanced topics are of interest!

]]> Comment on Improving the Beginner’s PID: Direction by Brett http://brettbeauregard.com/blog/2011/04/improving-the-beginners-pid-direction/comment-page-2/#comment-48258 Brett Sun, 13 May 2012 15:18:24 +0000 http://brettbeauregard.com/blog/?p=1187#comment-48258 @jazz I'm not sure I agree with you on that. 4-20mA control valves are definitely more precise, but you can approximate an analog behavior by controlling how long the solenoid pulses over a given widow (similar to PWM, but slower) we've been having a great conversation on the <a href="https://groups.google.com/forum/?fromgroups#!topic/diy-pid-control/Dnt--H8IUXU" rel="nofollow">diy-pid-control group</a>. I'd love to hear your thoughts. @jazz I’m not sure I agree with you on that. 4-20mA control valves are definitely more precise, but you can approximate an analog behavior by controlling how long the solenoid pulses over a given widow (similar to PWM, but slower)

we’ve been having a great conversation on the diy-pid-control group. I’d love to hear your thoughts.

]]> Comment on Arduino PID Autotune Library by jazz http://brettbeauregard.com/blog/2012/01/arduino-pid-autotune-library/comment-page-1/#comment-48254 jazz Sun, 13 May 2012 14:07:03 +0000 http://brettbeauregard.com/blog/?p=1893#comment-48254 wow...i had not seen your ospid project, so you really materialized it :) great wow…i had not seen your ospid project, so you really materialized it :)
great

]]> Comment on Arduino PID Autotune Library by jazz http://brettbeauregard.com/blog/2012/01/arduino-pid-autotune-library/comment-page-1/#comment-48252 jazz Sun, 13 May 2012 13:41:16 +0000 http://brettbeauregard.com/blog/?p=1893#comment-48252 Thanks for all the great work in both libraries, I'll rewrite it in assembly for the msp430 together with hardware design . Nice project jazz,Saigon Thanks for all the great work in both libraries, I’ll rewrite it in assembly for the msp430 together with hardware design . Nice project

jazz,Saigon

]]> Comment on Improving the Beginner’s PID: Direction by jazz http://brettbeauregard.com/blog/2011/04/improving-the-beginners-pid-direction/comment-page-2/#comment-48248 jazz Sun, 13 May 2012 13:07:09 +0000 http://brettbeauregard.com/blog/?p=1187#comment-48248 @peter, the problem with ph control is that it is exponential ,you can't use a solenoid valve for that. You must get real control valves with the right curve of the plug and seat,In industries we use a split range for the 2 control valves, the valve for acid uses 4..12 mA (0..50%) and the valve for alkaline is using 12..20mA(50..100%) this means by pH7 both valves are closed. google for micropak control valves Hopefully this gives you some ideas @peter, the problem with ph control is that it is exponential ,you can’t use a solenoid valve for that. You must get real control valves with the right curve of the plug and seat,In industries we use a split range for the 2 control valves, the valve for acid uses 4..12 mA (0..50%) and the valve for alkaline is using 12..20mA(50..100%) this means by pH7 both valves are closed.
google for micropak control valves
Hopefully this gives you some ideas

]]> Comment on Improving the Beginner’s PID: Initialization by wezzo http://brettbeauregard.com/blog/2011/04/improving-the-beginner%e2%80%99s-pid-initialization/comment-page-1/#comment-46643 wezzo Sat, 05 May 2012 01:29:33 +0000 http://brettbeauregard.com/blog/?p=772#comment-46643 This is a really fantastic blog that gives a really good balance of practical problem->solution stuff and enough background to give it context. Really very well done! I'm still geeking out, and my inner nerd has 'horny rimmed glasses' over this. I jest ye not! Hoping to adapt this to Arduino PID temp controller and maybe notsowobbly wobblebot. This is a really fantastic blog that gives a really good balance of practical problem->solution stuff and enough background to give it context.

Really very well done!

I’m still geeking out, and my inner nerd has ‘horny rimmed glasses’ over this. I jest ye not!

Hoping to adapt this to Arduino PID temp controller and maybe notsowobbly wobblebot.

]]> Comment on Improving the Beginner’s PID: Direction by Alex http://brettbeauregard.com/blog/2011/04/improving-the-beginners-pid-direction/comment-page-1/#comment-46533 Alex Fri, 04 May 2012 13:08:21 +0000 http://brettbeauregard.com/blog/?p=1187#comment-46533 Awesomeness redefined !!! the best tutorial that I have seen for a long time .. Lots of respect.. Awesomeness redefined !!! the best tutorial that I have seen for a long time .. Lots of respect..

]]> Comment on Arduino PID Autotune Library by tom http://brettbeauregard.com/blog/2012/01/arduino-pid-autotune-library/comment-page-1/#comment-46182 tom Wed, 02 May 2012 18:48:01 +0000 http://brettbeauregard.com/blog/?p=1893#comment-46182 Thanks Brett, ahem it didn't compile so I just changed it. :) Figured I need the dither because I am measuring using a DS18B20 accurate to about 0.1 oC and it tends to hunt around the set temperature. I've added some similar code to the PID library. I am looking at coding low pass filters for the input (to avoid aliasing) and the derivative (to limit gain). Thanks Brett, ahem it didn’t compile so I just changed it. :)

Figured I need the dither because I am measuring using a DS18B20 accurate to about 0.1 oC and it tends to hunt around the set temperature. I’ve added some similar code to the PID library.

I am looking at coding low pass filters for the input (to avoid aliasing) and the derivative (to limit gain).

]]> Comment on Arduino PID Autotune Library by Brett http://brettbeauregard.com/blog/2012/01/arduino-pid-autotune-library/comment-page-1/#comment-46152 Brett Wed, 02 May 2012 15:18:22 +0000 http://brettbeauregard.com/blog/?p=1893#comment-46152 @tom dither! neat. one thing: on the .h you have SetDither(double), but in the cpp it's an int. I'm surprised that compiled for you. I also see you put it some of the additional tuning correlations. also cool! can't wait to see what else you add! @tom dither! neat. one thing: on the .h you have SetDither(double), but in the cpp it’s an int. I’m surprised that compiled for you.

I also see you put it some of the additional tuning correlations. also cool! can’t wait to see what else you add!

]]> Comment on Arduino PID Autotune Library by tom http://brettbeauregard.com/blog/2012/01/arduino-pid-autotune-library/comment-page-1/#comment-46150 tom Wed, 02 May 2012 15:03:37 +0000 http://brettbeauregard.com/blog/?p=1893#comment-46150 I forked the code and added some stuff. I'm afraid I don't really know how to use Github so I hope I didn't mess up. I forked the code and added some stuff. I’m afraid I don’t really know how to use Github so I hope I didn’t mess up.

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