Arduino؛ مرجع millis
https://docs.arduino.cc/language-reference/en/functions/time/millis/
Arduino؛ متن رسمی نوع داده و سرریز
https://raw.githubusercontent.com/arduino/reference-en/master/Language/Functions/Time/millis.adoc
Arduino؛ Blink Without Delay
https://docs.arduino.cc/built-in-examples/digital/BlinkWithoutDelay/