On 1/19/14 2:00 AM, P Nielsen wrote:
To Jim Lux. After you get it working, would you consider putting the details
online, or selling as a kit?
Half coded.
I'll publish all the details..
It's pretty easy.. a Arduino, a clock, a wall wart to power it. I
haven't tried it yet (no clock to test with until the stores open), but
I'm assuming that it's just a wire from the digital output port to the
clock. Might need a resistor in series.
The other burning question is "how accurate" does it have to be. The
scheme I have now basically has a table of "rate" vs day of year (which
I still need to calculate).
Right now, the EOT is changing almost 30 seconds/day, which implies that
the clock could be some seconds off during part of the day (although
"true" at noon).
Given the tens of ppm accuracy of the crystal = some seconds/day it
seems that I want a bit better algorithm.
Rather than drive from a table, maybe actually calculating it. the
Arduino is no ball of fire for floating point computation, but still, it
doesn't have that much to do. It could be that I can just calculate the
rate every second.
But then I have to differentiate the equation of time... and I haven't
had enough coffee yet to differentiate the chain of sinusoids analytically.
P Nielsen
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