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From: mikey@eskimo.com (Mike Fields)
Subject: Re: AC zero crossings into microcontroller?
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Date: Tue, 18 Apr 1995 06:09:57 GMT
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mark stephens (mark.stephens@gsfc.nasa.gov) wrote:
: I need to control a few AC power devices from a microcontroller (HC11).  I
: have working a typical triac circuit controlled by a zero crossing
: opto-isolator ( MOC3040 <-> 10K resistor <-> triac gate ).  This works
: fine for turning a device on or off from one of the HC11's ports.  

: But I'd really like to do a dimming routine to control incadescent lights
: and possibly an AC fan.  So I think I need to get the timers on board the
: HC11 in sync with the AC power source.  That way I should be able to turn
: on a device for as little as 1/60th of a second (or is that 1/120th).

: How have other folks solved this problem?  
: thanks!
: mark

==> Funny you should ask that --- Get a copy of the January '95 issue
of Electronics Now.  There is a construction project in there for
controlling 8 channels of lights with a 68705 micro syncronized to
the zero crossings.  All the gory details!!

mikey

-- 
Mike Fields (mikey).......... The Gadget Works!
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