adegani / CRUMAR-DS-2-MIDI

Add MIDI features to Crumar DS-2 Analog synth

CRUMAR-DS-2-MIDI

Add MIDI features to Crumar DS-2 Analog synth using Arduino or bare ATMega328 (with Arduino Bootloader)

This work is published under GNU/GPL.

NOTE: This is a WORK IN PROGRESS! Use with caution!

Abstract

The Crumar DS-2 is a vintage made in Italy analog synth. Unfortunately, it comes without a MIDI IN/OUT capabilityes. The goal of this project is to add the MIDI port to this wonderful peace of gear by simply substitute the original keyboard decoder board (P-431 on the DS-2 schematics) whit a new one that add MIDI capabilities.

In this repository you can find the Arduino sketch and the schematics of the DS-2_MIDI board and the connection diagram of the Crumar P-431 board.

The DS-2_MIDI board comes in two fashions:

DS-2 MIDI IN

This simple board provides only MIDI IN to the DS-2. The schematics comes with two microcontroller footprints: one for the Arduino Nano and one for the bare ATMega328 chip.

What you can do with this board?

• Receive MIDI NOTE ON/OFF messages

NOTE: with this board, the DS-2 keyboard will be disabled.

In order to use this variant, please make sure to comment the line

#define DS2_FULL_VARIANT

in config.h, and refer to the schematic and board P-431_MIDI_IN_NANO or P-431_MIDI_IN_BARE depending on if you use Arduino Nano or ATMega328 bare chip.

DS-2 MIDI FULL (under development)

This advanced board provides MIDI IN and OUT to the DS-2. The schematics comes with two microcontroller footprints: one for the Arduino Nano and one for the bare ATMega328 chip.

What you can do with this board?

• Receive MIDI NOTE ON/OFF messages
• Send MIDI NOTE ON/OFF from DS-2 keyboard
• Send and Receive MIDI pitch shift messages (TO BE IMPLEMENTED)

NOTE: with this board, the DS-2 keyboard are still usable.

In order to use this variant, please UNcomment the line

#define DS2_FULL_VARIANT

in config.h, and refer to the schematic and board P-431_MIDI_FULL.

DISCLAIMER

This is not a commercial work. USE IT AT YOUR OWN RISK. I'm not responsible of any damage to your Arduino / DS-2 or your person.

Uploading DS-2 sketch using Arduino

1. Upload Arduino ISP sketch to your Arduino
2. Open DS-2 Sketch
3. Select board -> Arduino Duemilanove or Diecimila with processor ATmega328
4. Select Programmer -> Arduino as ISP
5. Press Upload using programmer (Ctrl+Shift+U)

If you receive a signature error, modify /home/axel/Software/arduino/hardware/tools/avr/etc/avrdude.conf, section m328p, modify the signature 0x1e 0x95 0x0F with 0x1e 0x95 0x14