Tim Hughes asked:
I don't know if you are using photovoltaic cells or phototransistors or
CDS cells?
----------------------
Phototransistors bought at a small shop for about $2 each. The one I
used has a wide angle lens and the one in reserve a narrow angle lens.
I'm pretty sure the biggest problem is not having a DC light source.
I've also tried it with daylight but an incandescent lamp was probably
still contributing to what the detector saw. As it is, it still works
OK for 1/60 and slower where an error of 1-2 milliseconds doesn't matter
much. Timing is via a little Quick Basic program which needs to be run
in DOS mode or under real DOS to keep Windows from trying to multi-task.
I should be a little smarter now if I ever find the time to get back to
it. BTW, it was easy to make. I used a 15-pin D connector plugged into
the joystick port. The phototransistor acts as one of the four
joystick push buttons. The joystick port provides the power so the only
other part required is a 100K resistor which is a normal part of the
pushbutton circuit. Presumably, one could use up to four
phototransistors to make a more sophisticated device.
Chuck Norcutt
Woburn, Massachusetts, USA
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