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Back in the saddle again
Join Date: Oct 2001
Location: Central TX west of Houston
Posts: 56,752
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Quote:
Originally Posted by Pazuzu
Tangentially related...
We built a street sign for the Lab, and illuminated it with several LEDs. The LEDs were being controlled via an Arduino microprocessor.
We didn't want to leave the lights on all of the time, so we decided to turn them on at dusk. Option one was to just turn them on every night at 6pm. Option two was to use a light sensor. But, we're super nerds, so we used option three. We wrote code to solve the solar equation of time and calculate on the fly, each day, the local sunset time for the sign, and turn the lights on then. We approximated a few lines for brevity and to fit in the Arduino memory, but it's within 5 minutes on any given day.
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Nice. So you cover the changing daylight throughout the year as well as DST. Cool.
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Steve
'08 Boxster RS60 Spyder #0099/1960
- never named a car before, but this is Charlotte.
'88 targa  SOLD 2004 - gone but not forgotten
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