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Re: What's the best ultrasonic?
We've used the Maxbotix ones without a hitch. Attach +5V, GND and AN to an analog port, and away you go.
Beware of using two at a time facing in the same general direction. The internal logic gets confused and unstable readings follow because they will interfere with each other.
See Maxbotix FAQ for a solution to that problem. If you control them with the RC (and pulse them at the same time), they won't interfere with each other.
We've had success with them, so I hope that you do,
Good Luck
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