It's measured by Uno board. Period between interrupts on pins 2,3, output send to serial. I am aware there is some error while measuring it and it's not 100% accurate.
That 1ms value is difference between measured and desired time. So far it's cca 1ms during 3 minutes. Even if it's in real 10ms on 3 minutes it is still acceptable.
Any other methods of measuring it that is simple and do not require special hardware?
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