[Jon Stratis]

It's not a bad idea to think about this, and think about how it could be improved... but might I suggest you do some tests first with the accelerometer on the robot, without any additional hardware? You may find that it's "accurate enough" for your needs.

One of the most common problems i see in computer programmers is that the program is never "done" - there's always something that can be improved, tweaked, or modified... An important part of engineering is determining when something is "good enough" and moving on to the next task.