On 5/22/14 9:20 AM, Mark Moulding wrote:
On Wednesday, May 21, 2014 8:33:17 AM UTC-7, nixiebunny wrote:
I wonder if the Arduino background program is causing the problem? It
does something to keep ocntrol of hte machine. Does anyone know what
that is? I don't.
Actually, there is no background process running on the Arduino; the
Arduino is put back into program (boot-loader) mode by pulsing the DTR line
from the host computer, which does a hardware reset of AVR. There is a
timer interrupt at 1 kHz, but that uses very little CPU (less than 1%); the
PWM outputs are also done using timers, but via hardware on the chip, so no
instructions are executed.
Thanks for that info. I was wondering because a previous Arduino project
I worked on had timing troubles.
This clock may just have a lot of wiring capacitance - I still haven't
seen it!
--
David Forbes, Tucson AZ
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