Andre, TRIACs work differently, you cannot use a PWM signal to drive a
triac.

Check out my page on Phase Controlled Dimming, which is what you'll need
to understand in order to build an AC line dimmer.

http://ubasics.com/adam/electronics/doc/phasecon.shtml

I hope this helps!

-Adam

> -----Original Message-----
> From: Andre Abelian [mailto:engelec@EARTHLINK.NET]
> Sent: Wednesday, February 14, 2001 4:33 PM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: [EE]: dimmer with pic can't make it work
>
> Hi to all engineers.
>
> I am making a simple light dimmer for my kids and
> I am having hard time to make it work with a triac.
> I am using pic16c72 hardware pwm , MOC3010, and Power triac.
> The pic works fine I checked it with scope when I connect it
> thru opto triac the lamp suppose to turn on low and go higher brightness
> all I see while PWM goes from 0-70 % blinks a few times
> and stays on on higher duty cycle for load I use regular 110 v lamp.
> when I connect any LED on PIC output I can see it slowly increases
> the brightness I am not sure if same thing happening inside of MOC3010.
> I do not know what is wrong with it any help will highly appreciated.
> attached is the schematic.
>
> Andre
>
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