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. 

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