November 2007
Beginner
320 pages
11h
English
Content preview from The Unofficial LEGO MINDSTORMS NXT Inventor's Guide
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28 CHAPTER 3
The ultrasonic sensor has a range of 2.55 m or 8.4 feet
and maintains an accuracy to within 3 cm. In fact, the NXT
measures the ultrasonic sensor’s readings in either inches
or centimeters. An important fact to keep in mind is that the
ultrasonic sensor can “see” larger objects better than smaller
ones, objects with solid surfaces better than softer ones, and
square or box-like objects better than smooth ones.
Multiple ultrasonic sensors operating in the same room
can interfere with each other; this occurs when the waves
sent by one ultrasonic sensor rebound to another ultrasonic
sensor, resulting in an erroneous reading. This w
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