Basic Stamp II

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I am trying to build an automatic dawn simulator. I want it to start
gradually brightening a light over a period of 30 minutes, where it
will reach it's peak brightness. I have the Basic stamp 2 starter
kit, a DS1302 real time clock, and a triac. The plan is that when the
clock hits a given time the microprocessor will start slowly
adjusting the firing angle to the triac which will step up the
voltage given to the light. My problem is that I am not sure how to
handle the programming. Any help on what commands I should use in
order to control the triac would be greatly appreciated.

Thanks,

Josh
jbw0592@n...

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jbw0592@n... wrote:

> I am trying to build an automatic dawn simulator. I want it to start
> gradually brightening a light over a period of 30 minutes, where it
> will reach it's peak brightness. I have the Basic stamp 2 starter
> kit, a DS1302 real time clock, and a triac. The plan is that when the
> clock hits a given time the microprocessor will start slowly
> adjusting the firing angle to the triac which will step up the
> voltage given to the light. My problem is that I am not sure how to
> handle the programming. Any help on what commands I should use in
> order to control the triac would be greatly appreciated.
>
> Thanks,
>
> Josh
> jbw0592@n...

you will probably want to look at setting up an opto-daic to fire the
triac, i have built dimmer packs before and the way i did it was to have
the basic stamp give a value to an eight bit d/a chip, that fed the
analog dimmer packs, the analog dimmers consisted of a compairitor with
one input tied to a ramp circuit that was triggered and the ac zero
crossing, the other would be the analog control signal, the compairitor
fired an opto-diac which fired 4 trac's in parallel to get a channel
rating of 2.4kw, if your interested i can did up the part numbers
lw