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 s.jones@csm.arts.ac.uk 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
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