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  • Great, thank you! I had always thought that timers were not working in interrupts and that this is why you cannot use delay() there, am I wrong? Commented Dec 11, 2017 at 14:29
  • Sorry, now I may understand: actually, the problem is not that timers were stopped in interrupts, but that delay() relies on an interrupt itself; is this right? Commented Dec 11, 2017 at 14:31
  • Mmh, no, this is not it: delay does not seem to have rely on any interrupt: void delay(unsigned long ms) { uint32_t start = micros(); while (ms > 0) { yield(); while ( ms > 0 && (micros() - start) >= 1000) { ms--; start += 1000; } } } Commented Dec 11, 2017 at 14:34
  • @Zorglub29: delay() relies on micros() which relies on timer0_overflow_count which is updated by the TIMER0_OVF interrupt. Commented Dec 11, 2017 at 16:39