[sdiy] Arduino module progress

[Jason Proctor]

good progress on the arduino synth module. digital and analogue I/O 
works and MIDI input works. the scaling on the analogue is not 
perfect but it's good enough for the moment. if/when i do the PCB 
i'll include trimmers in all the important places.

so far the module has run an audio frequency square wave oscillator, 
AR envelope generator, and the MIDI to CV that's now in the files 
section of the group. it provides a decently tracking pitch CV over 
about 4 octaves, a velocity CV, and a clock pulse derived from MIDI 
clock, the division of which is variable between 24ppqn and 0.25ppqn 
via a front-panel pot. in the final design there should be a switch 
to turn off the analogue I/O biasing, so that the full analogue 
output voltage range can be used for pitch and CV etc. also there 
might be a switch to AC couple the analogue outs.

the MIDI input is on a switch, flip it one way for MIDI, and the 
other way to upload sketches. it's interesting/funny that the sketch 
is still running for a few seconds during the upload, so it can 
potentially play wonky melodies out of the CV outputs :-)

now i'm waiting for a panel from FPE so i can do the final pieces - 
MIDI output, the remaining 3 pots, two switches, two LEDs, and the 
USB jack etc.

comments/flames welcome.

http://groups.yahoo.com/group/arduino_synth/