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ROBOTC

Sensing

Forward Until Dark / Light • 2

Carnegie Mellon Robotics Academy / For use with LEGO

MINDSTORMS® Education NXT software and base set 9797

Forward until Dark Light Sensor (cont.)

Light Sensor

The Light Sensor (in the normal Active mode) shines a

light out in a cone in front of it, and measures how much

light comes back to it, from either reection or ambient

sources. See additional explanation below.

Detects:

Feedback:

Typical use:

Sample code:

Reected + Ambient light

Brightness (0-100)

Line detection

while (SensorValue(lightSensor) > 40)

will run the while() loop as long as the

light sensor value remains brighter

than 40.

And now, let’s look at a new sensor.

This is the Light Sensor. When turned on, it shines a cone of red light out from the red LED, and

measures how much of it comes back into the light detector through the clear lens.

Clear lens

A light detector measures

how much light comes back.

Red lens

A cone of red light shines out

from the red LED.

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