PB702 MIDI Synthesizer

The MIDI Synthesizer gives the possiblility to connect your Paper Bits to your Keyboard. It is polyphonic up to six notes and has three different waveforms: square, triangle and sine.
It's basicaly an Arduino klone running a small program based on the wonderfull Mozzi librarie.

For burning the bootloader look here:
AVR & Bootloader
For uploading the program one needs an USB to Serial adapter or an Arduino:
The Arduino as a Serial Adapter


Paper PCB

Parts

  • Resistors:
  • 1x 220 Ohm
  • 1x 330 Ohm
  • 2x 470 Ohm
  • 2x 1 KOhm
  • 2x 1.2 KOhm
  • 1x 2 KOhm
  • 1x 3.3 KOhm
  • 1x 3.9 KOhm
  • 1x 8.2 KOhm
  • 1x 10 KOhm
  • 1x 47 KOhm
  • 1x 100 KOhm
  • 1x 220 KOhm
  • 1x 1 MOhm
  • Capacitors:
  • 2x 22 pF
  • 2x 1 nF
  • 3x 100 nF
  • 1x 150 nF
  • Electrolytic Capacitors:
  • 1x 1 µF
  • 2x 10 µF
  • Semiconductors:
  • Atmega 328P-PU
  • OpAmp MCP 6002
  • Optocoupler 6N138
  • Cristal
  • 1x 16 MHz
  • Diodes
  • 1x 1N4148
  • 1x LED
  • Mechanical:
  • 1x IC socket, 28 pin
  • 2x IC socket, 8 pin
  • 1x pin strip 1x14pin
  • 2x pin header, female 90° 1×3, 1×2
  • 2x pin header, male 90° 1×3, 1×2
  • 2x push button
  • 3x jumpers

Software