Hi, I am trying to use millis() to time the interval for which a pin is in a LOW state. I have been examining the stopwatch sketch in the Arduino playground. I think the problem is in line 12, the first line of loop(). I can't figure out where this line should go. I need to use a laststate in some …

Using millis() to get elapsed time

system September 15, 2012, 12:44am 3

  lastState = photodiodePin;

Why are you setting a state variable to a pin number?

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