Arduino USB Midi Interface


1 x MIDI IN    1 x MIDI OUT   1 x USB

ProMicro USB to MIDI Interface PCB

Appears as MIDI interface on PC Mac Linux Android
Fully programmable using Arduino IDE
Comes pre-programmed so works straight away
Ideal for embedding in your project

PCB works with 6N138
Header pins long enough to plug into you own project
(ver3) PCB available seprately as a kit or make your own--> PDF

Expand to create your own controller
Every analogue and digital pin free to use

Media Library
Pro Micro USB to MIDI Interface Built with PCB
MIDI IN
Circuit Diagram
5v MIDI IN Circuit Diagram
MIDI Circuit Assembled close UP
MIDI IN
Breadboard
5v MIDI IN Circuit breadboard
Waveform
6N138
5v MIDI IN Circuit breadboard
What's in the Kit
Components
1 x Arduino Pro-Micro 5v - PDF
1 x PCB
1 x 6N138 Opto Isolator - PDF
1 x 1n4148 Signal Diode
3 x 220 Ohm Resistors (red red black)
1 x 10k Resistor (brown black orange)
1 x 470 Ohm Resitor (yellow violet brown)
2 x 3.5mm Stereo Jack sockets
2 x 5 Pin DIN Chassis sockets + wire    
Reference
Software & Libraries
Arduino IDE
www
Control Surface - GitHub
www
Pre-loaded Arduino Sketch
.ino
Test the MIDI in
www
Printed Circuit Board
PCB Artwork - Works Single Sided Etch
ZIP - PDF Normal - PDF Mirrored
Circuit Diagram & breadboard layout
Click
ATmega32U4 Datasheet PDF
PDF
5v 3.3v controller 6N138 Confusion LINK
Other Reading
(because we're standing on the shoulders of giants)
... -Click
... -WWW Link
Stuff you need
Hand Tools
1 x Soldering Iron & Solder
1 x Side Cutters

Other Stuff
MIDI Cable
MIDI Instrument or controller
Computer with USB socket and Internet Access

Be Careful
Music equipment is expensive.
Check your work against the pictures.
You can't really go wrong.
But it is your responsibility   :-)
Assembly Instructions
1
Smallest parts first  
Diode - must go in this way round    Diode goes in this way round
Resistors - check the colour code
6n138 - must go in this way round
Round dot next to square pad 6N138 close up
2
Solder header sockets to PCB  
This depends on how you want to use the board.
If you want to expand and add or remove the ProMicro later solder these sockets -
If you want it small and non removable just solder the header pins ready to receive proMicro - IMAGE
3
Solder sockets  
3.5mm Stereo Jacks
Or
5 Pin Din Sockets
4
Solder headers to PCB  

5
Check your work before you power it up.  
1 - Check soldering with maginfine glass
2 - Make sure orientation of components matches photos
3 - Connect the USB socket to a computer