Quote:
Originally Posted by writchie
A pair of sharp IR sensors should work well for this.
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That's what I'd tend to go with. Maybe have them on servos so that the left one is slightly offset to the left and the right one is slightly offset to the right, so you can tell which way it's moving and track it. It would probably work best to point them at the bar that goes to the trailer hitch, because that's less likely to have a ball fly past it.