[sdiy] Two parameter mechanical controller thoughts....

Ben Bradley ben.pi.bradley at gmail.com
Fri Jun 7 19:26:16 CEST 2019


I remember the "Crazy Synthesizer Demo" from a few years ago, and just
looked at it again. From what I remembered, I thought it was just a
big touch-screen like an ipad, but I see it's a long slider with a
round knob.

There's also the ribbon controller like on the Micromoog, and I recall
seeing one that's substantially longer. That's not what you want, but
it's another idea.

I kind of like the belt/pulley idea. This could go to a
high-resolution rotary encoder, microcontroller and a high-resolution
DAC to generate a precise control voltage that feels "analog."

On Fri, Jun 7, 2019 at 1:13 PM Quincas Moreira <quincas at gmail.com> wrote:
>
> I think I'd lose the softpot too, and use some kind of belt/pulley to turn a rotary pot/encoder
>
> On Fri, Jun 7, 2019 at 9:58 AM thresholdpeople via Synth-diy <synth-diy at synth-diy.org> wrote:
>>
>> The thing with CNC gantry systems like 3D printers is that most lower end ones use stepper motors for both the drive and positioning, so running them in reverse won't be possible to create a control voltage based on position with out a whole lot of extra circuitry. However they may often have parts like linear bearings, precision-ish shafts, and all sorts of other hardware that could be re-purposed.
>>
>>
>>
>> Check out Author & Punisher - http://www.tristanshone.com/ - he makes awesome controllers, and has one or two that are as you're describing, Pete. He's pretty open about construction and functionality.
>>
>> ‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
>> On Friday, June 7, 2019 9:55 AM, Pete Hartman <pete.hartman at gmail.com> wrote:
>>
>>
>>
>> On Fri, Jun 7, 2019 at 7:07 AM bbob <fluxmonk at gmail.com> wrote:
>>>
>>> i'd go wireless - bluetooth or ble from whatever controls are on the carriage, and a time-of-flight sensor to measure the carriage position.  there's probably a lot of hardware bits you could repurpose from folks developing diy 3d printers for the carriage mechanics.
>>>>
>>>>
>>
>> I'm not sure wireless would be practical for within-the-module communications in a Euro module or standalone controller meant to interface with Euro.....
>>
>> 3D printer carriages would be a good source of inspiration though.
>>
>> The linear bearings at McMaster look really interesting, I'll have to spend some time digging around in that stuff.
>>
>> Thanks
>>
>> Pete
>>
>>
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>
>
> --
> Quincas Moreira
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