Schematics, Board Layout, and Code for
Latest commit 1735a24 May 1, 2014 @flysonic10 Update

Karma Controller

A build-it-yourself 7-button USB controller for controlling through Reddit Enhancement Suite. Karma Controller lets you procrastinate on Reddit more productively. Its 7 buttons are used to up vote, down vote, select posts, toggle images, and open & close comment tabs.

More at

The files here include a board layout and schematic, as well as the controller's arduino code.