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This is awesome, and makes me want to try building something similar. On a related note, can anyone recommend a good source for learning about PCB design?

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Sparkfun (http://www.sparkfun.com) has some good tutorials. "Beginning Embedded Electronics" is a good place to start.

I personally got started with microcontrollers and digital electronics by reading "The Microcontroller Idea Book" by Jan Axelson. It's a bit dated, but very well-written, and for me it was the first time that hardware really "clicked". I still refer to it from time to time for ideas for interfacing I/O devices.

GeekHack has lots of resources and knowledgeable folks re: all aspects of keyboard building:

http://geekhack.org/index.php?board=117.0

I built my board (http://technomancy.us/173) primarily building on knowledge from geekhack.org and the #geekhack channel on freenode.

Of course I would add that if your goal is more to make a cool board than learn about pcbs, it's easier to skip the PCB entirely and just hand-wire the switch matrix yourself. PCBs make sense at a scale of 5+ but IMO just add extra overhead for a one-off design.

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