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 Forum index » DIY Hardware and Software » Developers' Corner
Keypad used as Keyboard
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inform3r



Joined: Sep 03, 2006
Posts: 59
Location: nyc

PostPosted: Thu Jun 11, 2009 4:46 pm    Post subject: Keypad used as Keyboard Reply with quote  Mark this post and the followings unread

For a long time I've had the idea bouncing around in my head about having a keypad-type controller for a synth. I swear I remember seeing a site a few weeks ago and somebody illustrated how they did it. Unfortunately I didn't bookmark it because at the time I had so many pages open about something else I was pursuing.
BG Micro has a bunch of the keypads that I've always pictured using. Here's a quick example at this link:
http://www.bgmicro.com/index.asp?PageAction=VIEWPROD&ProdID=10843

I wanted to ask here if anyone has built a controller from a keypad and/or if they know of the website I mentioned? I guess the whole thing is similar in style to what Kraftwerk used on their Computerworld Tour. I was thinking it would be neat to house the pad in some kind of box and either have jacks on the back or maybe the box will have leads instead. I'd be interested in anyone's feedback.
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richardc64



Joined: Jun 01, 2006
Posts: 618
Location: NYC
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PostPosted: Fri Jun 12, 2009 3:42 am    Post subject: Reply with quote  Mark this post and the followings unread

I have not built this.

http://www.cgs.synth.net/modules/cgs10_pedal.html

Although perfect for a matrix-type keypad, it uses the discontinued, hard to find 74C922.

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mark_olson



Joined: Oct 26, 2006
Posts: 177
Location: Lawrence, Kansas

PostPosted: Sat Jun 13, 2009 9:51 am    Post subject: Reply with quote  Mark this post and the followings unread

You can get that 74C922 from futurlec.

I'm in the home stretch of building the cgs10 so I can't quite say yet how terrific or not it is. Others here who have built it seem to agree that it's good for what it is.

Mark
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slacker



Joined: Nov 18, 2007
Posts: 301
Location: England
Audio files: 11
G2 patch files: 1

PostPosted: Sat Jun 13, 2009 10:01 am    Post subject: Reply with quote  Mark this post and the followings unread

If the 74C922 is hard to get, there's also Ray Wilson's matrix keyboard scanner http://www.musicfromouterspace.com/analogsynth/KEYENCODERPCB/KBDMATRIX022005.html.
I think it should be possible to make something simpler based on that to work with a keypad. I might give it a try.
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