[sdiy] MIDI bass pedals project

[David Brown]

I've been working on building a set of MIDI bass pedals.  I got the 
mechanism from a Hammond T series organ.  I rebuild the pedals which was 
mostly to deal with the rust, dirt, and missing springs.  I modified the 
switch PCBs to provide 13 switches on a common bus.

I designed a small PCB with a processor that supports MIDI in and out along 
with a 4 line to 16 decoder for the key switches.  I've got it all running 
although I have yet to build a cabinet for it.  I'm trying to decide how 
many features to add to the code before I build the cabinet.  So far I have 
a normal key mode, a sticky key mode where the notes hold until the next 
key, and a basic arpeggiator.  The processor has four A/D channels so I'm 
debating about adding some analog controls.  I was going to drive both MIDI 
and CV/Gate/Trig but I think I'll just stick with MIDI.

The DB-9 connector is for programming from my PC so I can easily update the 
code.

Photos of progress at
http://home.earthlink.net/~dabr/davebr/MOTM/DJB%20Bass%20Pedals/

Dave