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How LDR (Light Dependent Resistor) Works

An LDR is a type of sensor that changes its resistance based on the amount of light it receives.

In bright light, the resistance of the LDR decreases, allowing more electrical
current to pass through.

In darkness or low light, the resistance increases, reducing the flow of current.
This change in resistance allows the robot to “sense” light and react accordingly.

21 st
Century #Creativity
Activity Assembling the Model of Light Follower Robot Skills

Overview

A Light Follower Robot is a robot that looks for light and goes towards it. If you shine a flashlight
in front of it, the robot will follow where the light goes. It uses a special programmable controller
board to understand what the sensors see and then tells the motors what to do. In simple words, it’s
a robot that moves when it follows the light.

The controller board consists of a programmable button. Press this button four times, and it will
glow a transparent LED, indicating that the robot is ready to work as a “Light following Robot”.

Learning Objective

Create a Light Follower Robot that follows light sources.

What is LDR sensor and how it works, what are the applications of LDR sensor?

Learning Outcomes

Students will learn how to work with Light sensor.
Develop hands-on experience in creating interactive and responsive robots.

Components Required

Small C x 2 Medium Plate x 1 Small Plate x 1 Caster Strip x 1 Small L x 1

Motor x 2 Wheel x 2 LDR Module x 1 Controller Board Caster Wheel x 1
(brain module) x 1

Mechanical Concepts with Mechatron Kit 85