[sdiy] Very cheap SPI pressure sensors.. anybody ??

[Ben Stuyts]

Awesome, thanks for the link! I watched the two Youtube demos there, and the timing is not too bad. The viewer indicates 60 fps, so 16 ms per frame. That would also be a limiting factor of course.

Ben


> On 21 Mar 2021, at 03:39, John P Shea <info at extrinia.com> wrote:
> 
> https://github.com/nai-kon/PlaySK-Piano-Roll-Reader <https://github.com/nai-kon/PlaySK-Piano-Roll-Reader>
> 
> On Sat, 20 Mar 2021 at 10:35 pm, Ben Stuyts via Synth-diy <synth-diy at synth-diy.org <mailto:synth-diy at synth-diy.org>> wrote:
> Has anybody ever tried pointing a video camera at the piano roll and do some real-time machine vision type of recognition? Would the resolution (i.e. timing) be good enough?
> 
> Ben
> 
> 
> > On 19 Mar 2021, at 23:06, Didrik Madheden <nitro2k01 at gmail.com <mailto:nitro2k01 at gmail.com>> wrote:
> > 
> > On Fri, 19 Mar 2021 at 22:29, Jean-Pierre Desrochers <jpdesroc at oricom.ca <mailto:jpdesroc at oricom.ca>> wrote:
> >> An optic based reader would look about like this:
> >> [Image]
> >> 
> >> Notice the big horizontal LEDs bar over the row of holes in reading..
> >> 
> >> Not very nice..
> > 
> > The cable management could be nicer, but I would personally not mind.
> > But I can see two problems:
> > 1) It doesn't look original.
> > 2) Even if you don't care about that, it obscures the currently played
> > line, which might be aesthetically important.
> > 
> >> On the other hand a vacuum based reader would look like the original thing:
> >> [Image]
> > 
> > Oh! That's something I didn't understand about the mechanism at first.
> > I thought the vacuum was transmitted through the paper, so that you
> > would have one "transmitting" side and one receiving side. Instead, it
> > has constant pressure and relieves the vacuum pressure when a hole
> > passes over.
> > 
> > So that gives me a different idea for a working principle based on
> > light: reflection. No hole=light reflects back. Only one side of the
> > paper has electronics. This could be done with either a visible LED
> > (for an additional visualizer effect) or an IR LED (for
> > authentic-looking operation). This method might be susceptible to
> > light interference through the holes though... Probably not a good
> > idea, just throwing ideas out there.
> > 
> > /Didrik
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