[time-nuts] Arduino Frequency Accuracy

[Jim Lux]

Just in case you want to build a clock with an Arduino..

http://jorisvr.nl/arduino_frequency.html

ADEV measurements, etc.


take home message.. absolute accuracy is a few kHz out of 16 MHz... 
probably a 100 ppm crystal.

On some Arduinos (or Teensy3's which is what I use) there's a provision 
for a 32kHz clock crystal.. that might be a bit better as a time base.