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45504 EV3 Ultrasonic Sensor is a Mindstorms set released in November 2013. It contains a ultrasonic sensor which can be used with 31313 Mindstorms EV3.
LEGO.com Description
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The digital EV3 Ultrasonic Sensor generates sound waves and reads their echoes to detect and measure distance from objects. It can also send single sound waves to work as sonar or listen for a sound wave that triggers the start of a program. Students could design a traffic-monitoring system and measure distances between vehicles, for instance. There is an opportunity to discover how the technology is used in everyday items like automatic doors, cars and manufacturing systems.
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$29.99 