Redditor Soonermandan‘s first DIY project is this set of three wooden pedals which he built to use while playing Battlefield 3. The pedals let him use his feet to control the keyboard commands for sprinting, crouching, and lying prone. He used magnetic reed switches to sense when the pedal is depressed and a Teensy USB to send the appropriate keyboard command to the computer. He posted his code in the comments and says that the Teensy USB “is extremely responsive with no perceivable input lag.” No word yet if his project has given him a competitive advantage during gameplay.
Google Reader pedal