MIDI Merger Project

From circuitbending to homebrew stompboxes & synths, keep the DIY spirit alive!

Moderators: Kent, Joe., luketeaford, lisa

Post Reply
User avatar
Sandrine
Super Deluxe Wiggler
Posts: 2299
Joined: Tue Jun 09, 2015 10:28 pm
Location: BC Canada
Contact:

MIDI Merger Project

Post by Sandrine » Thu Oct 24, 2019 3:16 pm

I have designed a simple 3 way MIDI merger / splitter that can re-direct MIDI by Port and Channels.
There's also Clock routing, transport message, PC, CC port routing which is useful.

[video][/video]
(HD best full-screen viewing)

It seems to work well thus far and will fulfill all my own needs.
It uses and Atmega2560( for the ports of course!) so could be used with the 2560 Arduino board as a shield. I used a raw TQFP100 breakout

It handles "running status" no problem and just about anything (except Active Sensing it ignores & SysEx it ignores).
Low latency <1mS simultaneously on all 3 outputs.
Nice OLED display with big chars and scrolling lists

I am posting the code (all my own) and other assorted info (user guide, parts, 3D printer info etc. but no schematics yet) so if anyone wants to make one, it'll be a piece of cake

Program:

http://www.freshnelly.com/midimerge/MIDImerge.zip

3d Print files (obj & stl):

http://www.freshnelly.com/midimerge/3D-MIDImergeBox.zip

Info & manual (doc):

http://www.freshnelly.com/midimerge/SDS ... ger3x3.zip

User avatar
Sandrine
Super Deluxe Wiggler
Posts: 2299
Joined: Tue Jun 09, 2015 10:28 pm
Location: BC Canada
Contact:

Post by Sandrine » Fri Oct 25, 2019 9:53 am

In answer to some PM's I don't see why this couldn't be a module!
8HP should be enough to fit the 6 jacks (panel mount) if placed strategically ...

User avatar
Dave Kendall
Set The Controls . . .
Posts: 1230
Joined: Thu Jul 16, 2009 7:20 am
Location: England

Post by Dave Kendall » Fri Oct 25, 2019 11:19 am

Nice work Sandrine !
Want to Buy: KURZWEIL KSP8

"Everything in moderation, including moderation"

User avatar
grenert
Common Wiggler
Posts: 250
Joined: Tue Jan 28, 2014 10:34 pm

Post by grenert » Sat Oct 26, 2019 12:07 am

Very cool project, thank you for sharing it! I've never used a 3D printing service before. Do you have any recommended vendors?

User avatar
Sandrine
Super Deluxe Wiggler
Posts: 2299
Joined: Tue Jun 09, 2015 10:28 pm
Location: BC Canada
Contact:

Post by Sandrine » Sat Oct 26, 2019 8:59 am

Dave Kendall wrote:Nice work Sandrine !
Thanks Dave!
grenert wrote:Very cool project, thank you for sharing it! I've never used a 3D printing service before. Do you have any recommended vendors?
Naw, I do my own printing, but I have seen some in passing and they do a much nicer job :hail: Shapeways is pretty good at it from what I've seen

I use Maya-->obj-->Blender (free)-->Cura (free) to get to gcode for the printer. Printers are so super cheap now too

User avatar
Sandrine
Super Deluxe Wiggler
Posts: 2299
Joined: Tue Jun 09, 2015 10:28 pm
Location: BC Canada
Contact:

Post by Sandrine » Fri Nov 01, 2019 9:49 am

I have been thinking about what format a module of this would be for the best use
- 6 jacks 3.5mm TRS with toggle switches for polarity for 6 channels I/O
- 2 TS jacks for non-TRS MIDI
- USB slave for DAW & FW updates
- 2 host ports for USB MIDI
- Display & Encoder

I don't know how practical this would be with all the TRS jacks & wires snaking off to other than rack devices (because not strong like 5pin MIDI) but it would get rid of all those TRS/5pin adapters :yay:

User avatar
Paranormal Patroler
Super Deluxe Wiggler
Posts: 11096
Joined: Tue Aug 30, 2011 3:40 pm
Location: the Terminal beach

Post by Paranormal Patroler » Fri Nov 01, 2019 10:32 am

There are TRS-to-DIN adapters that don't include cables. Check the orange one here:

You just plug a small TRS cable and you're done. You can even switch between Korg/Arturia mapping. a TRS only MIDI matrix would be awesome!
All rights reserved; all wrongs reversed.

User avatar
Sandrine
Super Deluxe Wiggler
Posts: 2299
Joined: Tue Jun 09, 2015 10:28 pm
Location: BC Canada
Contact:

Post by Sandrine » Wed Nov 06, 2019 10:20 am

That's pretty cool! I like the no cable
With the weak 3.5mm midi going off-rack I guess one could 3D print up some "thimbles" that go under the nut, might work.
I have busted off my fair share (usually tripping over cables when I'm excited haha) so tend to flip them over the back which is also a PITA

Post Reply

Return to “Music Tech DIY”