The Ultrasonic Radar USI lets you measure distances from about 2cm to 4m.
The sensor uses sound to make the distance measurement. You can use it to make a ruler, detect objects or people entering a space and even use it to make a simple 3D map of an area, when combined with optional RC servos.
 
Use it with your JackBord PRO driving kit to make an obstacle avoiding robot.
 
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