LDR Light Sensor
LDR Light Sensor - Image 2
LDR Light Sensor - Image 3

LDR Light Sensor

₹50.00

Overview

The Light Sensor Module (v0.9b, model 034000WH2 / 10589A-01) is an analog electronic board designed to detect ambient light levels. It features a Photoresistor (Light Dependent Resistor / LDR) as its primary sensing element. As light intensity increases, the resistance of the LDR decreases, producing a corresponding change in output voltage.

The module includes an onboard operational amplifier (U1, LM358B / MV358I) configured as a buffer/signal conditioning stage to ensure stable, reliable signal transmission to microcontrollers such as Arduino, Raspberry Pi, ESP32, and other embedded platforms.

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Description

Key Specifications

Parameter / Feature Specification / Value
Module Version / Model v0.9b (PCB Marking: 034000WH2 / 10589A-01)
Primary Sensor Light Dependent Resistor (LDR / Photoresistor)
Onboard Op-Amp IC LM358B (MV358I dual operational amplifier)
Operating Voltage (VCC) 3.3V to 5V DC
Output Signal Type Analog Voltage Signal (SIG) proportional to light level
Header / Interface 3-Pin Header (J1): GND, VCC, SIG
Onboard Components LDR, R2 (Voltage Divider Resistor), C1 (Filter Capacitor), U1 (Op-Amp)
Mounting Holes 4 x Corner mounting holes for secure enclosure installation
Board Dimensions Compact square PCB form factor (~25 mm x 25 mm)

 

Pinout Description

Pin Name Function Description
GND Ground Connects to the system/microcontroller ground (0V)
VCC Power Supply Power input pin (+3.3V to +5V DC)
SIG Analog Signal Output Outputs analog voltage corresponding to detected ambient light

 

Applications and Uses

  • Automatic Lighting Systems: Used in smart streetlights and night lights that automatically switch ON at dusk and OFF at dawn.
  • Solar Panel Optimization: Integrated into dual-axis solar trackers to detect sun direction and maximize energy capture.
  • Display Brightness Adjustment: Utilized in smartphones, monitors, and laptops to auto-adjust screen backlight depending on room illumination.
  • Security & Alarm Systems: Serves as an optical intrusion detector or light-beam break sensor in security setups.
  • Smart Agriculture & Greenhouses: Monitors sunlight exposure for crops to automate artificial growth lighting or shade curtains.
  • IoT & DIY Robotics: Ideal for light-following robots, ambient monitoring projects, and home automation systems using Arduino or Raspberry Pi.

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LDR Light Sensor

₹50.00