12mm Light Sensitive Photoresistor LDR

12mm Light Sensitive Photoresistor (LDR)

Light Detection Automatic Control Low-Cost Sensor

The 12mm Light Dependent Resistor (LDR) is a type of photoresistor that changes its electrical resistance depending on the amount of light intensity falling on its surface. It is widely used in automatic lighting systems, light detection circuits, smart home devices, and electronic projects.

The 12 mm size refers to the diameter of the photosensitive surface, which provides good light sensitivity for various applications.

Infographic Overview

Basic Specifications

Main Components

Working Principle

The LDR works using photoconductivity.

Step-by-Step Operation

1 Light falls on the CdS semiconductor surface.2 Photons eases as light intensity increases.

Light vs Resistance Relationship

LDR Structure

12mm LDR Sensor Zig-Zag CdS Photosensitive Surface Metal Leads

Common Applications

Automaticontrollers

The LDR can be easily used with:

• Arduino Uno

• ESP32

• Arduino Nano

• Raspberry Pi

Usually it is connected in a voltage divider circuit with a resistor.

Example Circuit Concept

5V[LDR] Analog Input[Resistor]GND

The voltage changes depending on the light level, which can be read by a microcontroller.

Advantages

Low cost and widely available Simple to use in circuits Low power consumption Good sensitivity to visible light Ideal for DIY electronics

Limitations

Slower response compared to photodiodes Accuracy affected by temstrong>Components

• 12mm LDR

• Arduino Uno

• Relay module

• LED or lamp

Working

LDR senses ambient light When it becomes dark system turns ON the light When daylight returns lig