Page 91 - Robo_Genius_V1.0_flipbook_C4

Concept

A light sensor on the Micro:bit can measure the amount of light in the
environment. By using the Micro:bit’s light sensor, we can control the movement
of a servo motor based on how bright or dark it is. For example, when the room

is bright, the servo motor might move to one position, and when it is dark, it
could move to a different position. This kind of control is useful for devices like
automatic window blinds that open when it is sunny or close when it gets dark.

Observations

After setting up and running the code to control the servo motor with the
Micro:bit light sensor, the following can be observed:

1. In a bright room (lighter): The servo motor moves to 180 degrees. This
simulates the motor responding to higher light levels, like opening blinds

when it is sunny.

2. In a dim or dark room (less light): The servo motor moves to 0 degrees.
This shows the motor responding to low light levels, such as closing blinds
when it gets dark.

By varying the light levels in the environment, you can observe how the servo

motor changes its position, demonstrating how the light sensor can be used to
control the movement of a motor automatically based on light intensity.

Application

A light sensor is used in solar garden

lights. During the day, the light sensor
detects sunlight and keeps the lights off
while charging the battery. When it gets

dark, the sensor notices and automatically
turns the lights on. This way, the lights
only turn on at night, helping to save

energy and keeping gardens or paths lit.

Basic Motor Control and Sensors 89