Using navX MXP to get robot velocity

[Gdeaver]

Initially, I thought the Bosch integrated IMU was better than the Navmxp for this. However there is a difference between on the kitchen table and on a robot. On a really robot the error is about the same as Silbert noted. We also looked at several gaming mice back in 2013. The problem with mice is the carpet. If we played on a smooth flooring they could be a solution. They loose there accuracy at higher velocities. If some one wanted to put the effort into it using a camera several inches off the carpet and proper illumination coupled Advanced optic flow algorithms may work for FRC bots.
For our team, machine vision solutions have been beyond our reach with the resources we have. We are a swerve team. To navigate 3 tote auto this year we used encoders on all 4 wheels, a navxmxp, and a sonar sensor referencing the distance to the player station wall. Fusing these inputs, we are able to perform the several motions needed to accomplish the 3 tote auto reliably. Maybe some day auto navigation will be plug and play but for now it's hard. I commend the teams that did 3 tote auto this year.