12v dc timer [RE-wrenches]

[Kurt Albershardt]

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--On Wednesday, May 19, 2004 5:53 PM +0000 Ron Schroeder <wd8cdh at optonline.net> wrote:
>
>
> Kurt Albershardt wrote:
>
>> While we're at it, I've been looking for a DC sidereal clock/timer for
>> several years now--ever since working with the Honeywell TotalHome
>> automation systems (which included one.)  It's really nice telling your
>> timer "one hour after sunset" and having it work all year, irrespective
>> of clouds, storms, etc.
>
>
> A sidereal timer won't do that.  It will roll over once about every 23
> Hours, 56 minutes and 4.09056 seconds and will be off by about 24 hours
> by the end of the year.

OK, I'll buy that.  Honeywell always called it a sidereal clock and I never bothered to check on them.




> You really need a 24 hour clock with a lookup table for sunset at your
> latitude.  You could do it with a low powered PC.

Does anyone make a little microcontroller-driven version?

If not, do you think there's a market for one?





--thanks

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