Following up from #38 (comment).
Might be related to this, using long and should be using unsigned long: https://www.arduino.cc/reference/en/language/functions/time/millis/
long
unsigned long
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Following up from #38 (comment).
Might be related to this, using
longand should be usingunsigned long: https://www.arduino.cc/reference/en/language/functions/time/millis/