CV-lovers out there - Have a looksee @ the new version of the 1VpOct sketch for Arduino/MidiVox, aptly named - MidiVox_1VpO_v2.zip (details @ top of .pde file)
Hrrm … fairly certain some higher MIDI notes are somehow gating the CV signal which would effect a notes release in resulting synth output. Will squash this asap.
Otherwise, connections are same as previous, V-trig & S-Trig type Gate signals available from Arduino pins 5 & 4 respectively. Control Voltage signal available from pin 8 of the MCP4921 DAC chip (additionally, remember to disconnect nearby resistor from that pin) - and don’t forget to connect grounds between your synth and MidiVox/Arduino.
To put that in a more “step-by-step” context:
How To: Use a MidiVox shield as a MIDI->CV converter.
- Disconnect the 909Ω resistor from pin 8 of the MCP4921 DAC chip.
- Solder a wire to to pin 8 of the MCP4921
- Determine if your synthesizer uses V-trigger or S-trigger type Gate standard. Solder a wire to pin 5 if you're using V-trigger, or pin 4 if you're using S-trigger.
- Solder a wire to one of the "GND" ground pads on the MIDIVOX shield
- Connect the CV, Gate, and Ground wires to the appropriate jacks or solder points on your synth. Connect a MIDI device to the DIN-5 jack on the MIDIVOX shield
- Upload the 1-Volt-per-Octave CV sketch to your Arduino.
- Synth it up, Synthia!