LEGO Mindstorms EV3 Manuale d'uso - Pagina 13

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EV3 TECHNOLOGY

EV3 Sensors

Gyro Sensor

The Gyro Sensor is a digital sensor that detects rotational motion

on a single axis. If you rotate the Gyro Sensor in the direction

of the arrows on the case of the sensor, the sensor can detect

the rate of rotation in degrees per second. (The sensor can measure

a maximum rate of spin of 440 degrees per second.) You can then

use the rotation rate to detect, for example, when a part of your

robot is turning, or when your robot is falling over.

In addition, the Gyro Sensor keeps track of the total rotation angle

in degrees. You can use this rotation angle to detect, for example,

how far your robot has turned. This feature means you are able to

program turns (on the axis the Gyro Sensor is measuring) with an

accuracy of +/- 3 degrees for a 90-degree turn.

Note: The sensor must be completely motionless while being plugged

into the EV3 Brick. If the Gyro Sensor is attached to a robot, the robot

should be held motionless in its starting position as the Gyro Sensor

is plugged into the EV3 Brick.

CONNECTING THE GYRO SENSOR

On the EV3 Brick, go to the Brick App screen (third tab) and use

the Center button to select Port View.

Using a ﬂat black Connector Cable, connect the Gyro Sensor to

the EV3 Brick on Port 2. Make sure to hold the sensor very still while

you do this. On the EV3 Brick display, the Port View app should show

a "0" reading in the second small bottom window from the left, which

is the window representing input values from Port 2.

Still without moving the sensor, observe the display for a few

seconds. It should continue to display "0" for Port 2 with the Gyro

Sensor. In case the Gyro Sensor readings do not constantly display

"0" during the connection process, unplug the sensor and repeat

the procedure.

When the screen consistently displays "0" for a few seconds,

experiment with rotating the sensor and observe how the angle

reading changes. Remember, the Gyro Sensor measures the angle

of change on only one axis.

For more information, see Using the Gyro Sensor in the EV3 Software

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Gyro Sensor

90...º

-90...º

Single axis rotation

Brick App screen

Port View with Gyro Sensor