LM393 Photosensitive Light-Dependent Control Sensor LDR Module

LDR Arduino Light Sensor Module is a compact, easy-to-use sensor that detects ambient light levels using a photoresistor (LDR). It’s designed to interface directly with Arduino and other microcontroller platforms, enabling projects like automatic lighting, smart blinds, and light-activated alarms.

Key Features:

• Uses a high-sensitivity LDR for ambient light detection
• Adjustable trigger level via onboard potentiometer
• Digital output signal for logic-level interfacing
• Onboard power and output status LEDs
• Simple 3-pin interface: VCC, GND, D0

Technical Specifications:

• Operating Voltage: 3.3V to 5V DC
• Output Type: Digital (High/Low)
• Sensor Type: Photoresistor (LDR)
• Adjustable sensitivity using potentiometer
• Response Time: ~20–30 ms

Mechanical Specifications:

• PCB Material: FR4 standard-grade
• Connector Type: 3-pin header (2.54mm pitch)
• Mounting Hole Diameter: ~3mm
• LED Indicators: Power (Red), Output (Green)

Dimensions:

• Length: 32mm
• Width: 14mm
• Height: 12mm (with LDR and components)
• Mounting Hole Spacing: 27mm center-to-center

Mounting Options:

• Can be mounted using M3 screws through provided holes
• Direct plug-in to breadboards or jumper wire via header
• Recommended orientation: LDR facing light source

Schematic Diagram, Connection, Wiring and Pinout:

• Pin 1 (VCC): Connect to 3.3V or 5V
• Pin 2 (GND): Connect to ground
• Pin 3 (D0): Digital output (High when light level below threshold)
• Module can be used as switch or input trigger for Arduino

Datasheet/User Manual:

• Download LDR Module Datasheet (PDF)
• Arduino Sample Code and Wiring Guide (PDF)

Applications:

• Automatic street lighting systems
• Smart home lighting
• Solar-powered light automation
• Day-night detection in weather stations
• Robot line follower sensors (basic version)

Equivalent:

• LDR Module with Analog Output (A0 + D0 version)
• BH1750 Light Sensor (for digital I2C-based precision)
• TSL2561 Ambient Light Sensor

Package Includes:

• 1 x LDR Light Sensor Module for Arduino