Test the accuracy of the clocks of two Arduinos

Two identical Arduinos. Both with Blink sketch. Output signal from pin 13 is connected to pin 2 and 3 on Arduino Mega. In Mega we have sketch, which measures difference in microseconds between two external interrupts.
Dve rovnaké Arduina. Obe s programom Blink. Výstupný signál z pinu 13 je pripojený na piny 2 a 3 v Arduine Mega. V ňom je program, ktorý meria rozdiel medzi dvomi externými prerušeniami.
Source code a schema/Zdrojový kód a schéma:
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