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Re: Sonar Sensors legal
If your goal is to look for a ball, you already know where it is. You place it on a dot that is at a known place on the field, so as long as you put the robot in the right place you're OK. You can use a broken-beam sensor to tell you when you have it. All you really need to do is use your encoders to drive for x inches, then creep forward the last ~3 while checking the broken-beam sensor. Thus, you don't really need ultrasonic.
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Williams International - Commercial Engines - Controls and Accessories
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