Need simple timer/stopwatch sketch

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hello,
 i need simple timer or stopwatch sketch.
i have uno. 
i going use 2 photoelectric sensors , need basic simple sketch start timer when first 1 tripped , turn timer off when second 1 reached. displayed in seconds , minutes.   i have reset button start over.  read on digital readout, know how that.
any appreciated. 
thanks,
tony

the same question asked in forum few days ago.

is school assignment?

check this link - may you'll find 1 of classmate...

build code doing this:

in plain english it's


stage = waiting // start if detector1 goes above below threshold

loop

    read both detectors , button.

    if button pressed set stage waiting
    else
       if detector 1 above threshold , stage waiting set stage starting

        if detector1 below threshold , stage starting then
             record start time , set stage measuring

        if detector2 below threshold , stage measuring then
            done. display  duration (current time - start time). stage goes waiting.

        if stage measuring display current time - starttime in lcd // live view slow measure precision
   



Arduino Forum > Using Arduino > Project Guidance > Need simple timer/stopwatch sketch


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