This is sort of a tangent question to the discussion above. We put the vex ultrasonic sensor on our bot for some tests, and the guys ( a generic term for males AND females in my vocabulary

) returned with the statement that it absolutely would not detect curved objects (like the ball) unless it was absolutely directly under it. Now I understand angle of reflection and all that, but it seems that a sensor that can only detect objects lined up at exactly 90 degrees is not very effective in ANY situation. Is there another type sensor that
would work better, or is that just how these sensors work and we should try to detect the line on the floor instead?
Ann
Barstow Kuh-Nig-Its
Team 1939
(Gotta make a real signature one of these days)