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Count up/down?

Z

Zucker

Jan 1, 1970
0
I would like to be able to count the number of people entering (count up)
and leaving (count down) a room. I was thinking about using two photocells
driven by two small lasers, spaced 6" to 12" apart, to detect if a person is
entering or leaving. If photocell A was tripped before photocell B, the
counter would count up. If photocell B was tripped before photocell A, the
counter would count down. My problem is that I'm trying to come up with a
circuit that can detect the AB or BA pattern. May be a circuit that can
detect the lag between the two photocell voltages? I don't know.

If anyone has a suggestion for this circuit or any other ideas, I would
appreciate it.

Thanks,
Steve
 
Z

Zucker

Jan 1, 1970
0
Sorry for the identical posts. My Outlook is acting up.
 
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