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ROBOTC

Sensing

Forward Until Dark / Light • 4

Carnegie Mellon Robotics Academy / For use with LEGO

MINDSTORMS® Education NXT software and base set 9797

1. View the Reected Light values in View Mode.

Forward until Dark Thresholds 201

Reminder! Light sensor readings and other numbers used in this printed guide may

not be right for your environment. Your room’s lighting and the position of the sun and

shadows will cause light sensor readings to vary. Measure often!

So higher is brighter, and lower is darker, but if you remember from the last time we worked with

a large range of values, we set a threshold to separate the two values we care about. Before we

can set a threshold for the Light Sensor, we need to know what values mean ‘Light” and what

values mean “Dark.” Let’s take some readings to nd out.

In this lesson, you will learn how the Light Sensor works, and how its feedback compares to

the Touch and Ultrasonic Sonar sensors.

1a. Turn on NXT

Turn on your NXT if it is not already on.

1b. Navigate to View Mode

Use the left and right arrow buttons to nd

the View option, and press the Orange

button to select it.

1c. Select Reected Light

Use the left and right arrow buttons to nd the

Reected Light option, and press the Orange

button to select it.

Caution! Do not choose “Light Sensor*”!

Light Sensor* (and all sensors with a * at the

end of their names) refers to the old RCX-

generation Light Sensor, and will not provide

the correct readings for the NXT Light Sensor.

1d. Select Port 1

Make sure your Light Sensor is plugged into

Port 1 on the NXT. Select Port 1 on screen.

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Ambient TOUCH LIGHT Manual de usuario Pagina 4