This is an old revision of the document!
MIDI-Board
Here is the MIDI-In, MIDI-Out and MIDI-Thru board for the Arduino. It is made with the opto isolator 6N138 and the inverter 74LS04N. To prevent bootloading confusion (with older Arduino boards) always powers the opto isolator over the Arduino.
Depending on the position of the jumper on the board the second MIDI socket can be used for MIDI-Out or MIDI-Thru. Two LED indicates MIDI-In and Out. One if the board is powered.
An older version and the schematics are here: MIDI-Board
Paper-PCB
Code
midi_to_4xmotorumschalter_02.zip
Components
- inverter 74LS04N
- opto isolator 6N138
- 3 low current LEDs
- 1 capacitor 47nF
- resistors: 3x 2kOhm, 3x 220Ohm, 1x 3,3kOhm, 1x 1kOhm
- 1 diode 1N4148
- 2 Midi sockets
- pin
- Jumper