Ac Dimmer

reptile404 · Joined: 01 Apr 2011 Posts: 17

hello guys!
I'm working on ac dimmer which i use zero crossing detector.
I don't know why this code does not work well.
(detect H.edge and L.edge)

temtronic · Posted: Fri May 06, 2011 5:34 am

You look at the example code that CCS freely supplies in the folders file......

SherpaDoug · Joined: 07 Sep 2003 Posts: 1640 Location: Cape Cod Mass USA

Maybe you are having problems with power line noise. You may get more than 2 crossings per cycle if the AC is noisy. It is best to only enable the interrupt shortly before you expect the next crossing to occur. For 60Hz (8.33ms/half cycle) wait 8ms with a timer, then enable the edge interrupt for the last bit of time.
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reptile404 · Joined: 01 Apr 2011 Posts: 17

I don't think that problem is in noise because I'm just working on simulation (Proteus). Is my code correct (detects H.edge and L.edge , or just H.edge )? Can anyone give me another solution ?
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REPTILE404

55AA55AA55

temtronic · Posted: Sun Dec 25, 2011 9:09 am

Best (and ONLY real) solution is to get rid of Proteus. It is NOT the real World and does NOT simulate PIC code. Proteus is FULL of bugs ,errors, faulty DRCs and will never work correctly.
Quit wasting your time with it, get some real PICs and a breadboard and cut code.....

By the time you get this reply I could have cut code and had a real project working.

reptile404 · Joined: 01 Apr 2011 Posts: 17

Well, for your records it doesn't work in reality as well. I mean I've tried it on breadboard and development boards but no achievement, doesn't work.
If you didn't find where is problem, why blaming me ?
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REPTILE404

55AA55AA55

temtronic · Posted: Sun Dec 25, 2011 10:38 am

1a) what you show us is NOT a complete program.We need to know 1) type of PIC, 2) compiler version 3) most important a small but complete program( has to compile) that shows the problem.

1b) we'd need a schematic of the hardware too !

2) No one here will try to 'debug' a Proteus project. Just can't be done as the software is full of problems that's why it is necessary to use real hardware and complete code that we can test( until the turkey is ready !)

asmboy · Joined: 20 Nov 2007 Posts: 2128 Location: albany ny

Here is a fresh off the press zero crossing circuit that I ran across today.....

http://www.edn.com/article/520185-Mains_driven_zero_crossing_detector_uses_only_a_few_high_voltage_parts.php

I believe that with this isolated output used to interrupt a port B INT ...
and then load one of the timers, say timer0 - then the overflow from the timer could easily become the trigger for the TRIAC modulator.

Just add a bit of math - and there you go.

Cool

SherpaDoug · Joined: 07 Sep 2003 Posts: 1640 Location: Cape Cod Mass USA

After I detected a zero crossing I would mask any further detections till shortly before I expected the next crossing. That will help a lot with real world noise.

The code fragment you show looks OK, but there is not much we can tell you from such a small fragment. Follow temtronic's direction.
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The search for better is endless. Instead simply find very good and get the job done.