Need help with lookup table or direct calculation

[Acetronics2]

Hi,Darrel

I think we also must consider the table loading work ... ( humour !!! )


Alain

[nverma]

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?

[nverma]

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?

[Acetronics2]

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 ...

[nverma]

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