Aaron J. Miller wrote:
>
> Hello all,
>
> This question is only marginally related to pic's since I am going to use
> a 16C84 to control the chopper, but there seem to be quite a few bright
> people out there who may be able to help...
>
> I am trying to make an incandescent lamp dimmer from a 16C84 and planned
> on doing a simple waveform chop using a triac.  I realized, however, that
> since the pic is going to be doing a bunch of other time sensitive stuff
> that I don't have the processor time to manually sense the zero and chop
> the wave using the pic.
>
> So, is there any easy method to passively (from the pic's point of view)
> chop the AC wave?  i.e. use 8 I/O pins to a D-A to give a reference to the
> chopper circuit and have it do the rest?  That way I can just output the
> light level to the pins and it would stay put leaving the rest of the
> processor available?
>
> Thanks for any help,
> aaron
>
>
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> -     Aaron J. Miller           Email: millera@stanford.edu
> -     Physics Graduate Student  Web  : http://www.stanford.edu/~millera
> -     Stanford University       Phone: (415) 372-5575 (until 4/12/97)
>
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A diac and an optoisolator with cds out and a single pic pin PWM with a
resistor /capacitor integrator infinitely variable and you need the same
parts anyway.my $.02 Tony M.