deskthority

Oh oh.....

Adrian's Digital Basement trash picked a 20 year old voice mail box from Lucent. The box basically is an old 386 system with a few telecom boards.

He is having trouble connecting a keyboard and has tried a few routes.
Lucent Merlin Mail, Release 3, MM04, ~2000 production.

Real keyboard action ...

@CyberGene has the grand piano fully working now. He said it is fantastic and there is upside with some calibration and regulation.

Video and updated comments are here

http://forum.pianoworld.com/ubbthreads.php/topics/2951761/re-diy-real-grand-action-controller.html#Post2951761

www.youtube.com ...

Awesome progress CyberGene.

Now that you have got 10 keys calibrated and playable, last major hurdle is getting the multiplex performing fast enough with multiple simultaneous signals.

Advantage of triple sensor is elegantly shown in the orange & grey diagram

http://www.kawaimp.com/mp7/detail/touch/

wooting texts are a bit bulshitty. like "we use analog input so we can't have matrix". Also they don't need debouncing because IR switches don't bounce. What they need is EMI rejection. Which they can do with jacking up scanning speed to, say, 5kHz and have sub-1ms latencies (which are not that ...

So still researching this. Two interesting products noted below:
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There was a Texas-based open-sourced MIDI keyboard that was released around 2011 and then a much cheaper version was released around 2017. The 2011 board was foldable for easy transport and well reviewed but super expensive ...

Awesome project. Thanks for the detailed photo story also.

Organized and neat European workspace!

The mic sensor is an interesting approach but I might have some problems with noise as I use loudspeakers during the day and headphones at night.

then piezos would be a better option, that is what is used in electronic drums. But you would encounter a lot of problems with that too, I used to have ...

- more on the topic from the very informative Colin Pykett


Thanks for your thoughts here HuBandiT. A few quick thoughts.

The mic sensor is an interesting approach but I might have some problems with noise as I use loudspeakers during the day and headphones at night.

For "simplicity", it ...

Not really. MIDI uses 31250 bps with 1 start/1 stop/8 data bits, i.e., roughly 3 bytes per millisecond. Since this is a piano with not exactly a lot of additional controllers, most of the time Running Status can be employed, keeping the time to transmit a single Note On message well below 1ms. Even ...

What is the clock frequency of the MUX? How often "key in flight" and "key hit the string" events are detected in a single measuring pass?

Simpler question is "how fast is the fastest keystroke?"
What is the shortest time between "key left escapement" and "key hit the string"?

Thanks DMA ...

How often you get 2 events at once - i.e. miss an event? Like "the key was released, now it already striken the string"?

Could you kindly clarify this question? I am assuming that there will be just one optical sensor per (note) wooden keystick providing "velocity" data every scan.

Hi guys

Thanks for dropping by CyberGene and updating details on your mechanical wood piano project!

I see some people are "turbo charging" sampling rates on ADC on the Teensy to over 300ksps with some easy tweaking outside library. From a practical perspective you will be lower but still get ...

o man the internals on this pianos are awesome

The piano internals are awesome indeed! CyberGene purchased a very old internals from a dead grand piano.

I would love to see the key mechanism made too, in a way so you can regulate the tension on the keys and have custom tension depending on ...

I will ping CyberGene at the PianoWorld. He is in Bulgaria so takes a few days to respond due to time differences!

I think he is still noodling on how to best implement this.

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Most commercial digital pianos use 3 cheap rubber button sensors per key to measure each key. Factory mounting of the ...

Thanks DMA - appreciate your response.

CommonSense controller could be a great solution but as you note getting the velocity information would be an issue.

Fully bypassing the very slow MIDI transmission speeds is a tough challenge. . .

DMA - awesome project - kept me up until 4am last night hahaha.

A friend is converting an old piano keyboard to a MIDI controller with optical sensors. This will allow silent play with an awesome wooden grand piano keyboard via a computer Virtual Instrument (VI) program like PianoTeq.

Do you ...