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

[Jean-Pierre Desrochers]

>> 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.

 

I cannot do that because of the height of each square holes on the brass reading bar..
See this photo.. each square holes cannot accommodate 2 receivers.. only one optic fiber each so one receiver each allowed.

Thanks anyway for your comment !

 



 

De : Pete Hartman < <mailto:pete.hartman at gmail.com> pete.hartman at gmail.com> 
Envoyé : 11 novembre 2022 10:18
À : Jean-Pierre Desrochers < <mailto:jpdesroc at oricom.ca> jpdesroc at oricom.ca>
Cc :  <mailto:Synth-diy at synth-diy.org> Synth-diy at synth-diy.org
Objet : Re: [sdiy] Reading holes (voids) on piano paper rolls.. using Photo-transistors and PIC micro..

 

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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