17 - Diy Teensy midi controller

[thopa]

Here is a link to a project i have been working on, inspired by the Fourn controller and the arc | grid.

Its a 17 potentiometers teensy midi controller.

Thanks to @tehn for sharing the original files for the project.

17_Control

[andrew]

thanks !!!

can you share the dimensions ?

trying to figure out if the PCB is small enough to edit in the free version of eagle (80cm2 / 12.4in2)

[mzero]

I opened the .brd file in the free version of Eagle. It is 9824 x 4717 mil, which too big. It can be opened and viewed, but not edited.

Looking at the project - it is a very large PCB for not much electronics. I’d be tempted to instead use panel mount pots (which would be more stronger) - and wire them to a jumper harness on a much smaller board with the teensy.

[okyeron]

FWIW - If @thopa could add gerbers to the repo, you could always throw those into a gerber viewer or OSHPark to view the dimensions, etc.

[thopa]

Hiya!

Yes, it is a big board. The same length as an arc or a 128 grid, but half the width size of a grid.

Its half the size of the original fourn n 128:

Four-N 128 sized knob controller

[image] grouped into powers of four: 1, 4, 16. to address different levels of granularity. no visual feedback, just high quality pots. usb-midi for plug-and-play compliance, CC 1-21 i basically created a 128 grid sized shield for the teensy 3.1. or, it could just be considered a very expensive wire harness. the board uses the same high quality Alpha pots we import directly for our eurorack modules. the teensy code has one stage of noise filtering and is incredibly responsive. this is quite p…

I wanted a simple controller to use with my fates that was more or less the same size as the grid | arc.

Ill post the gerbers later.

Here is how it looks in oshpark:

https://oshpark.com/shared_projects/ii6tJ70N

[Gregory_Delabelle]

Maybe for the future making a Norns with integrated grid or arc or knobs or sliders or touchscreen?

[thopa]

Finished my 4

[wheelersounds]

Is this an open-sided case? Could you do a side profile shot? Beautiful work!

[andrew]

tons of pics in the repo !

[andrew]

@thopa ! 2 questions:

are you using 10mm spacers between the board and top panel ?

& are the pins on the rear of the board required ? (for additional power & ground) weirdly those pins are not available from pjrc

[marcus_fischer]

Oooh nice.
I would love to see an edit w/ i2c out like the 16n. Great work.

[thopa]

Yes those are M2.5 10mm long spacer with hexnuts and bolts.

The only pin used in that back row is the +3v:

Cheers

[Spencer_Salmon]

Is this available as a pre-built design?

[thopa]

Hi! Jm sorry its only do it yourself.
All the needed files are on github.
Cheers

[forestcaver]

Thanks @thopa ! I finally got around to building it (the Teensy I had ear-marked for it had been used for a few test projects and I finally desoldered all the crap hanging off it !!)
This is a really cool project - it works really well - I wish I’d built it ages ago !!! (Damn !)

[thopa]

Thanks @forestcaver ! Normally im the one building your stuff!

[forestcaver]

Nah - it’s really neat what you’ve done here though !!

That reminds me ! Got a few things you may be interested in and in the pipeline ! Give me a shout before xmas - will have a load of pcbs back by then !

[thopa]

Thanks mate! Im back into soldering again, had to take a break after lockdown.

Ill reach out to you ! slight_smile: