For this project I converted low-cost consumer keyboard to QMK using a Perixx Periboard-512 and a Teensy++ 2.0.
Make example for this keyboard (after setting up your build environment):
make converter/periboard_512:default
Flashing example for this keyboard:
make converter/periboard_512:default:flash
See the build environment setup and the make instructions for more information. Brand new to QMK? Start with our Complete Newbs Guide.