Description 

The Photosensitive Sensor Module (LDR Light Sensor) is a compact and reliable module used to detect ambient light intensity. It utilizes a high-quality light-dependent resistor (LDR) combined with an onboard LM393 comparator, providing a stable digital output signal.

This module is ideal for automation systems where light-based decisions are required, such as automatic street lights, smart home systems, and energy-saving devices. It can be directly interfaced with microcontrollers like Arduino or used to trigger relay modules.

With an adjustable potentiometer, you can easily set the light sensitivity threshold according to your application needs. The module outputs a LOW signal when the light intensity exceeds the preset level and HIGH when it is below.

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Key Features

• Uses high-quality LDR (Light Dependent Resistor)
• Built-in LM393 comparator for stable output
• Adjustable sensitivity via onboard potentiometer
• Digital output (HIGH/LOW)
• Strong driving capability (>15mA)
• Compact and easy to install
• Mounting hole for secure fixing

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Applications

• Automatic street lighting systems
• Light/dark detection circuits
• Arduino & microcontroller projects
• Smart home automation
• Solar tracking systems
• Relay-based light control systems

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Specifications

• Operating Voltage: 3.3V – 5V
• Output Type: Digital (0 or 1)
• Sensor Type: Photoresistor (LDR)
• Comparator: LM393
• Output Logic:
  • LOW → Light intensity above threshold
  • HIGH → Light intensity below threshold
• PCB Size: Approx. 3.2 cm × 1.4 cm