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temperature controller

 
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moon
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temperature controller
PostPosted: Sat Mar 03, 2007 6:54 am     Reply with quote
i would like to control a heater with pid controller output,in away that the number of cycles that the heater is on is determined by the pid controller output ,i will use a zero cross detection to determine where the ac sine signal will cross zero.please how can i use interrupt to do so Rolling Eyes
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PostPosted: Sat Mar 03, 2007 7:03 am     Reply with quote
PLEASE HELP ME I USE THE PIC16F877
Neutone



Joined: 08 Sep 2003
Posts: 839
Location: Houston

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Re: temperature controller
PostPosted: Sat Mar 03, 2007 1:31 pm     Reply with quote
moon wrote:
i would like to control a heater with pid controller output,in away that the number of cycles that the heater is on is determined by the pid controller output ,i will use a zero cross detection to determine where the ac sine signal will cross zero.please how can i use interrupt to do so Rolling Eyes


A better approach would be to detect zero crossing with the external interrupt pin and then set a timer to go off after a variable interval. When the timer goes off pulse a triac to turn on power. When zero crossing occurs power is automatically turned off by the triac. You only need to modulate the timer interval. This is a cheep and effective way to control power. This is used in lighting a lot to control intensity. Lights and heaters are nearly the same.

If you must operate in complete half waves just turn the heater on and off at zero crossing. PID output can be true false.
MOON
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HELP ME
PostPosted: Sun Mar 04, 2007 3:54 am     Reply with quote
ITHANK YOU FOR YOUR ANSWER ,BUT I AM A BIGGENER IN BROGRAMMING SO PLEASE GIVE ME THE CODE FOR THE INTERRUPT KNOWING THAT I AM USING THE FULL WAVE AC SIGNAL Embarassed
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