Quote:
Originally Posted by saand
you will have a big problem getting accurate timing unless you sink the clock to some external (more accurate) timing device than what the processor runs on.
|
That's what led me to RTC chips in the first place. I made a simple stopwatch-timer program based on the millis() function and let it run over night along side a timex wristwatch. After about 10 hours, it was off by a minute and change. That's something like 0.2% error, which is fine for tracking injector pulses and such. On the other hand, losing an hour and a half every month isn't up to snuff for time keeping.