[sdiy] My Player piano roll project... refining my design

Gerry Murray synthimuse at gmail.com
Sun Apr 9 17:20:24 CEST 2023


I would recommend two of these sensors operated in linear mode, with a 
small difference in their physical position and invert the signal from 
one of them.
 From these two signals you would get a 'detent' differential signal 
that would tell you the lateral error and allow you to adjust the 
horizontal position of the paper more accurately.

Best wishes


On 09/04/2023 16:09, Jean-Pierre Desrochers wrote:
> Hi all again,
> I’m still trying to refine my design and working on
> the paper centering process circuit.
> So far I’m using the tracker bar edge’s holes to detect
> left/right paper movements while playing the rolls.
> Those who are at the paper’s edge sides.
> The system works pretty well
> but still some rolls lacks of centering correction.
> SO I want to do some tests using Photointerrupters - Slot Type – with 
> open collector Outputs.
> Like those types:
> I’m trying to select the best accurate one to detect _paper edges_
> not the overall paper cutting the IR beam..
> Any idea of the best specifications to pick one ?
> *De :*Synth-diy <synth-diy-bounces at synth-diy.org> *De la part de* 
> Jean-Pierre Desrochers
> *Envoyé :* 23 février 2023 17:31
> *À :* Synth-diy at synth-diy.org
> *Objet :* [sdiy] My Player piano roll project... a small video demo 
> for you..
> *Importance :* Faible
> I’m not done yet with this project but this is promissing..
> https://www.youtube.com/watch?v=K7xXYqCB0AY
> I let the piano roll play its song while filming.. around 4:00 duration.
> Enjoy !
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