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Re: Questionable Results from Ultrasonic
I'm not sure from your description which sensors you're using, or whether you're having trouble at ranges longer than 1-2 meters or shorter than 1-2 meters. Most inexpensive ultrasonic sensors have a minimum effective range of several feet. If you want short ranges, look into optical sensors; Sharp makes a number of short-range optical sensors (presumably designed for copiers) that they market as standalone sensors (Pololu, RobotShop, and SparkFun carry some of them, as well as many other vendors). We've had performance fully up to the specifications with several of these.
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