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PIC AC line sinhronization

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tomikan

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interfacing pic to ac line

Hi!
I want to build a pic controlled dimmer. I need to sinhronize pic microcontroller to AC power line. I measure the period with timer1 in the external interrupt subrutine. The problem is that the bulb still blinging sometimes. How to eliminate this?
Thanks
 

pic.ac.ke

I have thought about this a few months ago. I did not solve it yet, but I do have an idea.

I plan to use a PIC with PWM hardware, and I would trigger an interrupt at (just after) each zero crossing and reset the PWM counter. I have not looked into this deeply, so it may generate glitches.

The crystal frequency I chose for this is 1M8432, to allow for the prescaler to bring the period down to an 8 bit value. Happy coding.
 

pic10f dimmer

Hi, There is an Application note for this on the microchip website, I believe for an PIC10F device but this code can be ported to a pic12 or pic16 !


I did look for you guy's:

TB094 Dimming AC Incandescent Lamps Using A PIC10F200
 

Thanks. Do you have any other idea how to do this with timer1 modul and external interrupt?
 

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