deskthority

I have no choice because my little USB 3 chip is only available in .5mm QFP, but I advise everyone to do it even if only for the challenge and experience. Not to mention the wide range of flexibility that's impossible to get with premade development boards like Teensy and Arduino, and economics (not ...

Teensy is just an expensive breakout with a few little conveniences. Do it yourself and gain skills.

I think Teensy 2 has just 21 I/O pins, or else it could probably work for 12x10.

Edit: oh, it looks like it does have 24.

Edit: Quick question: What would be the ideal controller for programming this with the TMK firmware? Is teensy 2.0 big enough or do I need the plus plus version?

You have 6 rows there, and 19 columns. I think 98 keys. You definitely can't do one pin for each column and row. Even if you do two ...

Not totally ideal because I'm working around my keycap set. But this is what I'll be basing my build on. It changes a little every day.