Reddit is a website that has in the past few months taken over my life. Not unlike Digg it aggregates all the best stuff on the internet and makes it easy to consume. The way posts are sorted or brought to the front page on Reddit has to do with the number of Upvotes and Downvotes a post gets over time. Now while these voting options are usually toggled by clicking arrow icons on the webpage they can also be controlled using keystrokes after installing the Reddit Enhancement Suite. After I found this, all the stars aligned for my project.
Step 1: Makerbotting a project box
Step 2: Circuit design and Teensy programming
Programming the keyboard functions on the Teensy is surprisingly simple. There are great instructions on the Teensy development board page for sending keystrokes to your computer and because the board identifies itself as a USB keyboard it works when plugged into a PC or Mac with no additional software! One note: to use the USB keyboard mode you must use the “Teensyduino” software which allows you to program the Teensy using the Arduino programming language and IDE rather than the native Teensy language. I’ve included the code in full at the bottom of the post, but to give a brief overview, when the upvote button is pressed the key combination “CTRL + SHIFT + A” is sent to the computer over USB, likewise if downvote is pressed “CTRL + SHIFT + Z” is sent to the computer. I defined these keystrokes in the Reddit Enhancement Suite manually because they seemed like a key combination that wouldn’t conflict with other programs (default is “a” and “z”).
For more detail: Reddit Controller, USB Upvote/Downvote button