We (1708) were looking for an easy solution to the same problem to implement during this week's DC regional. Here's what we came up with:
A USB num pad (
example)
This software that allows mapping of keystrokes to a virtual joystick device.
Convenient 3x3 button pattern (with additional buttons for controlling grippers, etc). No wiring required. Optionally, add colored electrical tape and marker annotations to make it pretty.
--Ryan
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FRC 2046, 2007-2008, Student member
FRC 1708, 2009-2012, College mentor; 2013-2014, Mentor
FRC 766, 2015-, Mentor