LDR 20 mm Light Dependent Resistor

The LDR (Light Dependent Resistor) is a light sensor that changes its resistance based on the amount of light falling on it. This 20 mm LDR is widely used in light-sensing applications such as light meters, automatic lighting systems, and other projects where light detection is needed.

Specifications

Model: LDR 20 mm
Operating Voltage: Typically used with voltages up to 5V DC
Resistance Range: Changes with light intensity; high resistance in darkness, low resistance in light

Special Features

Light Sensitivity: Sensitive to changes in light levels, providing variable resistance based on illumination.
Versatile Use: Suitable for various light-sensing applications and easy integration with electronics projects.

Wiring Connections

One Lead (Positive): Connect to a voltage source or one terminal of a resistor.
Other Lead (Negative): Connect to the ground or the other terminal of a resistor.
Analog Input: Connect the junction between the LDR and the resistor to an analog input pin on a microcontroller if using in a voltage divider circuit.

Power

Voltage Range: Works with a supply voltage of up to 5V DC.
Current Consumption: Very low, minimal current is used to measure light.

Original price was: ৳ 150.00.Current price is: ৳ 85.00.

Add to wishlist

Specification

Overview

Input and Output

Input: Light falling on the LDR changes its resistance.
Output: Provides a variable voltage output when used in a voltage divider circuit, which can be read by a microcontroller or other electronic systems.

Physical Characteristics

Dimensions: Diameter of 20 mm.
Material: Typically made of a semiconductor material with a light-sensitive coating.
Weight: Lightweight and compact.

Technical Specifications

Resistance Range: From several megaohms in darkness to a few hundred ohms in bright light.
Response Time: Quick response to changes in light levels, generally within milliseconds.

Additional Features

No Power Required: Operates based on light input without needing a power supply directly to the LDR itself.
Simple Integration: Easily used with a resistor to form a voltage divider circuit for light level measurement.

How to Use

Connect the LDR: Place the LDR in a voltage divider circuit with a fixed resistor. Connect one lead of the LDR to a voltage supply and the other lead to one terminal of the resistor.
Wire to Microcontroller: Connect the junction of the LDR and the resistor to an analog input pin on your microcontroller.
Power On: Provide power to the voltage supply.
Read the Output: The voltage at the junction changes with light intensity. Use the analog input on your microcontroller to read the voltage, which varies based on the light falling on the LDR.
Adjust and Calibrate: If needed, adjust the fixed resistor value in the voltage divider to fine-tune the sensitivity of the light detection.

This LDR 20 mm Light Dependent Resistor is a simple yet effective component for detecting and measuring light levels in various electronic projects.