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lang-cpp
servoandwasteFlapServo?Serial.println()is another no-no during an ISR. Any sort of serial communication is quite slow.print()just places the data in the buffer. The actual transmission is done via ISRs, which place each byte into the UART hardware register. So all the data would fill the buffer, untils it's full. And the data would only get send, when going out of the ISR. I think in the newer core versionsprintwill also not block at full buffer, when inside an ISR, though I don't remember, where I read that