[sdiy] Reading holes (voids) on piano paper rolls.. using Photo-transistors and PIC micro..

[Pete Hartman]

I think the suggestion of using more light from up thread is a good one.

I'd use two LEDs next to each other, and two receivers next to each other,
and read both ....  00 is blocked 01 or 10 is passed.  11 shouldn't happen.
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