LEGO Mindstorms EV3 User Manual - Page 15

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EV3 TECHNOLOGY

EV3 Sensors

Ultrasonic Sensor

The Ultrasonic Sensor is a digital sensor that can measure

the distance to an object in front of it. It does this by sending out

high-frequency sound waves and measuring how long it takes

the sound to reﬂect back to the sensor. The sound frequency is too

high for you to hear.

Distance to an object can be measured in either inches or

centimeters. This allows you to program your robot to stop a certain

distance from a wall.

When using centimeter units, the detectable distance is between 3

and 250 centimeters (with an accuracy of +/- 1 centimeters). When

using inch units, the measurable distance is between 1 and 99 inches

(with an accuracy of +/- 0.394 inches). A value of 255 centimeters

or 100 inches means the sensor is not able to detect any object in

front of it.

A steady light around the sensor eyes tells you that the sensor is in

Measure Mode. A blinking light tells you that it is in Presence Mode.

In Presence Mode, this sensor can detect another Ultrasonic Sensor

operating nearby. When listening for presence, the sensor detects

sound signals but does not send them.

The Ultrasonic Sensor can help your robots avoid furniture,

track a moving target, detect an intruder in your room, or "ping"

with increasing volume or frequency as an object gets closer to

the sensor.

For more information, see Using the Ultrasonic Sensor in the EV3

Software Help.

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Ultrasonic Sensor

250 cm / 99inch

250cm / 99inch

Detectable distance

NOTE:

Since the Ultrasonic

Sensor depends on reﬂection

of the sound waves it may be in-

eﬀective at detecting surfaces that

are textured or objects that are

rounded. It is also possible for

an object to be too small for

the Ultrasonic Sensor

to detect it.