An update and some more info. While the board seemed to work fine at first with just soldering directly to the intact IC pads, as I used it more I started to notice extraneous keys registering with key presses from time to time. This seemed somewhat random and I began to suspect that there were issues with stray current - I guess not too surprising considering the direct wire job (I thought I had gotten away with it). Hoping this was it, I went ahead and desoldered the ICs I had soldered to, and the main one while I was at it, and resoldered directly to the pads. This appears to have solved the problem and I'm not getting any more extra key presses.
- Desoldered1.jpg (557.5 KiB) Viewed 4906 times
- Desoldered2.jpg (352.08 KiB) Viewed 4906 times
I'm posting the keyboard matrix I came up with using the multimeter. The matrix is correct for my board so I would think it should be usable if you have the same board. The matrix also includes the Teensy++2.0 pins and the wire assignments used in firmware (so obviously only relevant to the software I'm using). For firmware I'm using Arduino C code that works but is far from elegant (e.g. lines of code for each key rather than using arrays). I just haven't gotten around to rewriting it and cleaning it up. If anyone wants a copy I'm happy to send it - just don't ridicule it too much! The coding was just part of the hobby for me - I would think TMK could be used as per matt3o's tutorial:
workshop-f7/how-to-build-your-very-own- ... t7177.html for some professional style firmware.
Below are the key matrix and a pic with labels of the pins I used on the PCB:
- jujitsu_matrixB.jpg (283.6 KiB) Viewed 4906 times
- Fujits_PCB_pinout.jpg (701.52 KiB) Viewed 4906 times
Great job OldIsNew ! It happens I own almost exactly the same keyboard!
