Generic Photosensitive Resistor Sensor Module for Arduino - Light Dependent Resistor (LDR)
Generic Photosensitive Resistor Sensor Module for Arduino - Light Dependent Resistor (LDR) - Image 2
Generic Photosensitive Resistor Sensor Module for Arduino - Light Dependent Resistor (LDR) - Image 3
Generic Photosensitive Resistor Sensor Module for Arduino - Light Dependent Resistor (LDR) - Image 4
SKU: SENS-3280
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Generic Photosensitive Resistor Sensor Module for Arduino - Light Dependent Resistor (LDR)

₹28.00 (Inclusive of all taxes)
Out of Stock

This photosensitive resistor (LDR) sensor module provides a simple analog interface for detecting ambient light intensity, compatible with Arduino and other 5V microcontroller platforms. It outputs a variable voltage signal corresponding to light levels, suitable for basic light-sensing applications.

Features

  • Analog Output for Light Intensity Measurement
  • High Sensitivity Photoresistor with Wide Resistance Range (80Ω to >20MΩ)
  • Onboard 10kΩ Resistor for Voltage Divider Circuit
  • Simple 3-Pin Interface (VCC, GND, Signal)
  • Compact Module Design for Breadboard and Prototyping

Out of stock

Description

The module utilizes a cadmium sulfide (CdS) photoresistor, a passive component whose electrical resistance decreases with increasing incident light intensity. This change in resistance is converted into a variable analog voltage by the onboard 10kΩ pull-up resistor, forming a basic voltage divider circuit.

The resulting analog signal can be read by a microcontroller’s ADC (Analog-to-Digital Converter) pin, such as those found on Arduino boards, to quantify ambient light levels. The module operates on a standard 5V DC supply and provides a straightforward method for integrating light-dependent control or monitoring into electronic projects.

Key Features

  • Core sensing via a cadmium sulfide (CdS) photoresistor.
  • Integrated 10kΩ resistor for immediate voltage divider functionality.
  • Wide operating voltage range compatible with 3.3V and 5V logic systems.
  • Standard 3-pin header (VCC, GND, SIG) for easy connection.
  • Compact PCB footprint ideal for space-constrained applications.
  • High-value build for reliable performance in educational and prototyping environments.

Applications

  • Automatic lighting control systems for DIY smart home projects.
  • Daylight harvesting sensors for energy-efficient prototype setups.
  • Light-triggered switches or alarms in security prototypes.
  • Basic light intensity data logging with Arduino or Raspberry Pi.
  • Educational demonstrations of analog sensor principles and voltage dividers.

Technical Specifications

Model / NameLight Dependent Resistor (LDR) Module
Sensing PrincipleCadmium Sulfide (CdS) Photoresistor
Light Resistance (Typ.)< 80 Ω (in full light)
Dark Resistance (Typ.)> 20 MΩ (in full darkness)
Onboard Resistor10 kΩ
Output SignalAnalog Voltage (via Voltage Divider)
Operating Voltage3.3V - 5V DC
Interface3-Pin (VCC, GND, SIG)
Dimensions (Shipping)3 x 2 x 1 cm
Weight4 g (0.004 kg)

Frequently Asked Questions

What is the operating voltage range for this LDR module?

The module is designed to operate from 3.3V to 5V DC, making it directly compatible with most common microcontroller platforms like Arduino Uno, Nano, ESP32, and Raspberry Pi GPIO (using 3.3V logic). The onboard circuit does not require a regulated voltage, but staying within this range ensures correct signal output to the ADC pin.

How do I connect this module to an Arduino to read light levels?

Connect the module's VCC pin to Arduino 5V, GND to Arduino GND, and the SIG (Signal) pin to an analog input pin (e.g., A0). In your Arduino code, use the `analogRead()` function on the chosen pin. The returned ADC value (0-1023 for a 10-bit Arduino) will be inversely proportional to the light intensity: higher light leads to lower resistance and a higher voltage on the SIG pin.

Does the module require calibration or is it ready to use?

The module is plug-and-play for basic functionality, but calibration is recommended for accurate light level quantification. Since the output is a simple analog voltage that varies with both light and supply voltage, you should map the `analogRead` values to known lux levels under specific lighting conditions in your application code to achieve repeatable measurements.

Package Includes

  • 1 x Photosensitive Resistor Sensor Module

Additional Information

Weight 0.004 kg
Dimensions 2 × 3 × 1 cm

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