What sensors do your teams use

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Originally Posted by marshall

We use students as limit switches... the robot runs into them and they let us know about it. Decent feedback but a little slow and if they get hit too hard then they stop working sometimes. The good thing is we seem to have a never ending supply of them for replacements.

Same here! We have some good video demos of using our student limit switches in autonomous mode:
https://www.youtube.com/watch?v=WumkMeRE6Iw

Seriously though, this year Team 4276 used the following sensors:

Optical encoders (drive)
LIDAR (drive, tower distance)
Gyro/Accelerometer (rotation and inertial distance measurement)
Hall Effect Switch (arm position reset)
Hall Effect Counter (gear tooth sensor -- shooter wheel sped control)
Rotary Encoder (Arm position)
USB Camera (Telemetry/Drive Vision)
2nd USB Camera (Autonomous target detection)
Vex Pushbutton Switch (intake ball detection)