Need help with lookup table or direct calculation

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  1. - 10th October 2006, 18:37 #1
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    nverma
    nverma is offline Junior Member
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    Hey Darrel,

    That table approach works well. now im trying to implement a PID controller to maintain the temperature at a desired temp by switching heaters on/off. I am thinking of using the PWM to do this. But I have to calculate my gain,I and D first. I think this can be done using the step response, but do you know what approximate values i can start out with and how to control the PWM with the output drive?
  2. - 11th October 2006, 08:01 #2
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    Acetronics2
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    Wink Already cooked !!!

    Hi, Nverma

    Have a look to : http://www.parallax.com/dl/docs/prod...eb-PC-v1.0.pdf

    there's a PID heather project with ALL the coeff. adjustment procedure ...

    AND PBP Basic compatible written overall ...

    Alain

    PS ... page 245 ...
    Last edited by Acetronics2; - 11th October 2006 at 08:07.
    ************************************************** ***********************
    Why insist on using 32 Bits when you're not even able to deal with the first 8 ones ??? ehhhhhh ...
    ************************************************** ***********************
    IF there is the word "Problem" in your question ...
    certainly the answer is " RTFM " or " RTFDataSheet " !!!
    *****************************************
  3. - 11th October 2006, 18:27 #3
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    nverma
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    Thanks Alain,

    I have that same document and have been reading through it. Its quite helpful. I will continue working on this and let u know if I have any further questions.

    Nikhil
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