Becuase you want 16 or less buttons its easy. You don't need a key scanner so just a 6402 (aka AY-5-101-5) is basically all you want. You can get em for pennies.
>From memory you want a 500kHz clock, but 1MHz crystals are more common so a flip flop will divide it in half. You pull a few pins up or down to set it in transmit mode. Put a cap and resistor on pin 21 to send a reset/init pulse. A 74922 will scan 16 keys into 4 bits. Hard wire the note-on and velocity byte and it should work. data sheet and last item here is basically it.. http://faculty.cs.tamu.edu/rabi/ppcproj/lcdkeypad/lcdkeypad.html also intersting, link via Bobby Whelans site http://www.borg.com/%7Ejglatt/hardware/key.htm but uses a PIC which is annoying because it needs programming. Or, find Robert Penfolds book "Midi Projects" from which I built one of these in 1984 when I was a teenager. Good Lord! People still use MIDI :D On Tue, 28 Aug 2007 10:45:02 +0100 Stuart Jones <[EMAIL PROTECTED]> wrote: > Hi > > I'm helping with an installation which will have 12-16 buttons (on/off) to > set off events in Pd and need to find a simple midi controller to just send > note on and note off messages on 12-16 notes to do that. I could hack a midi > keyboard but that would be a complicated and bulky solution given the size > of the installation. Any suggestions? > > Thanks > > Stuart > > > > > _______________________________________________ > [email protected] mailing list > UNSUBSCRIBE and account-management -> > http://lists.puredata.info/listinfo/pd-list -- Use the source _______________________________________________ [email protected] mailing list UNSUBSCRIBE and account-management -> http://lists.puredata.info/listinfo/pd-list
