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Soliciting Encoder Design Ideas

Building organ consoles for use with Hauptwerk, adding MIDI to existing consoles, obtaining parts, ...

Soliciting Encoder Design Ideas

Postby jkinkennon » Sun Sep 16, 2018 4:44 pm

I'm working on another encoder that will again be open source hardware and software though this time I may actively pursue selling a few assembled versions. I do sell encoders from time to time but haven't pushed this as so far they have not been readily configurable without specialized software.

So this will be a full-featured pie-in-the-sky version that should still be a bargain either assembled or as a kit. The details are at http://www.kinkennon.com/downloads/Kinkennon%20Encoder%20Plans.pdf.

I'd like ideas about ribbon vs flex cable for matrix keyboards, any features that seem important, whatever comes to mind. Right now I'm leaning towards the Molex 6-pin connectors you can see on my web site along with screw terminals for the odd outputs for relays, LEDs, lamps and stuff that is never the same from one console to the next. I've used 20-pin IDC (ribbon cable) housings for matrix keyboards.

So far I haven't settled on any display device other than the conventional LCDs but I am open to suggestions.
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Re: Soliciting Encoder Design Ideas

Postby murph » Sun Sep 16, 2018 6:47 pm

As a slight aside, a basic board with single kbd contacts that accomodates Fatar key-beds with attack. Make the code have a simple one line change that changes its ID. in HW, all done in Teensy 3.2. code.

Possible?

The change ID bit makes life easy...... (Gt, Sw, Ch etc...)
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Re: Soliciting Encoder Design Ideas

Postby jkinkennon » Mon Sep 17, 2018 1:39 pm

MIDI Boutique does such a nice board for Fatar keyboards that it would be like reinventing the wheel. When I needed a quick solution for adding Pianoteq to a console I used the https://www.midiboutique.com/MIDI-Encoders?product_id=214 which was great.

If someone wants to do the programming I could modify my Teensy 3.6 encoder to connect to a Fatar keyboard. I had intended to do a more capable Teensy encoder but ran into constraints. The PIC32MZ2048EFH has 6 fully buffered SPI channels that can run in 32-bit mode and buffer 128 bits (2 keyboards) per channel. The chip on the Teensy 3.6 has one fully buffered SPI channel with an additional 2 channels which are not buffered and not readily supported by the Teensyduino libraries.

I wonder how many PIC32MZ projects use the vast majority of the 144 pins on the largest of the PIC devices. I can run the entire project on a development system that makes 100 pins available except for implementing the 22x16 matrix that will be required (4-11x6 or 4-8x8). That won't happen until I have my own PCB in hand.

My goal is a $100 encoder for those willing to build their own. That will be a challenge with all the connectors adding to the cost.
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