[ManicMechanic]

I was wondering which sensors you use (especially in competition robots, but also in "fun" ones), and how they are essential to the function (or improvement) of your robot. I'm not looking for examples of, "Hypothetically you could uses an ultrasonic sensor to avoid bumping into walls" but actual examples that are proven to work, and work better than doing without sensors.

So far, the only sensors our team has used in competition are limit switches -- to stop a ring delivery device when it reaches the perfect height for a post, and to prevent a joystick-happy driver from grinding the gears. We have played with other sensors but haven't improved robot function as a result of using them.