The Genearic HID tool is meant as an easy way to create your own human interface devices. The project has the added benefit of showing us how to hack the hardware on the AT90USBKey developement board. The AVR-based device, which we saw used to make an SNES cartridge reader, comes in at just over $30 but with a few caveats. First, the breakout pads for the pins are not 0.1″ pitch and require some creative soldering to get at them easily. But the walk through also covers converting the board to run at 5v when in USB host mode, and altering the populated components to reclaim pins on the AT90USB1287 chip. The fun isn’t limited to this board, there’s also a home brew alternative based around the same chip.