LM393 Photosensitive LDR Light Sensor Module for Arduino
₹28.32 incl. GST (₹24.00 + GST)
LM393 Photosensitive LDR Light Sensor Module
Product Description
The LM393 Photosensitive LDR Sensor Module is a compact light-detection module designed to measure ambient light intensity and provide both digital and analog outputs. It uses a sensitive Light Dependent Resistor (LDR) along with an LM393 voltage comparator, making it suitable for Arduino, ESP32, Raspberry Pi, STM32, and other microcontroller projects.
The module can be used for automatic lighting, light monitoring, robotics, security systems, and other applications that require detection of changes in surrounding brightness.
Dual Output Modes
Digital Output (DO)
The digital output provides a HIGH/LOW logic signal based on the light threshold set using the onboard potentiometer. This is useful for trigger-based applications such as automatic lights, alarms, and light-activated switches.
Analog Output (AO)
The analog output provides a continuously varying voltage related to the detected light intensity. It can be connected to a compatible ADC input for monitoring changes in brightness.
Adjustable Sensitivity
An onboard blue precision potentiometer allows the user to adjust the light detection threshold. This makes it possible to configure the module according to the required brightness level for a specific application.
Status Indicators
The module includes a Power LED and a Digital Output Status LED, allowing users to quickly verify power and observe digital trigger activity during testing and calibration.
Key Features
- LDR-based light detection
- LM393 voltage comparator
- Digital and analog outputs
- Adjustable light sensitivity
- 3.3V–5V DC operation
- Power and output indicator LEDs
- Compact PCB design
- Mounting hole for easy installation
- Compatible with Arduino, ESP32, Raspberry Pi, and STM32
Technical Specifications
| Feature | Specification |
|---|---|
| Main Chip | LM393 Voltage Comparator |
| Sensor Type | Photosensitive Resistor (LDR) |
| Operating Voltage | 3.3V – 5V DC |
| Output Type | Digital (0/1) & Analog |
| Output Current | ~15mA |
| PCB Dimensions | 32mm × 14mm × 8mm |
| Connection | 4-Pin Header |
| Pins | VCC, GND, DO, AO |
Working Principle
The LDR changes its resistance according to the amount of light falling on it. The module uses this change to produce an analog signal representing light intensity.
The LM393 comparator compares the detected level with the threshold set by the onboard potentiometer. When the threshold is crossed, the digital output changes state, allowing the sensor to be used as a light-triggered switch.
Interface
The module provides four connections:
- VCC: Power supply
- GND: Ground
- DO: Digital output
- AO: Analog output
Typical Application Scenarios
Smart Home
Suitable for automatic lamps, day/night detection, curtains, and lighting control.
Automotive
Can be used in experimental automatic headlight and light-sensitive control systems.
Robotics
Useful for light-seeking robots, light avoidance systems, and contrast detection.
Security
Can be used for light-sensitive alarms and experimental laser or light interruption detection.
Agriculture
Suitable for sunlight monitoring and greenhouse automation projects.
Applications
- Automatic lights
- Day/night detection
- Light intensity monitoring
- Smart home automation
- Robotics
- Security systems
- Light-sensitive alarms
- Agricultural monitoring
- Greenhouse projects
- Arduino projects
- ESP32 projects
- Raspberry Pi projects
- STM32 projects
Package Includes
- 1 × LM393 Photosensitive LDR Light Sensor Module
Product Disclaimer
Product information provided on our website may vary between manufacturers, suppliers, and production batches. Please verify the actual module specifications before using it in critical applications.
Product images are for illustrative purposes only and may differ slightly from the actual product in colour, component placement, or other visual details.
Important Note
Calibration
If the digital output LED remains continuously ON or OFF, gently adjust the blue potentiometer until the output responds correctly to changes in light intensity.
Voltage
The module operates from 3.3V–5V DC. Ensure the supplied voltage is within the specified range.
Analog Output
When using the analog output with a microcontroller, ensure the output voltage is compatible with the ADC input range of the connected controller.
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Frequently Asked Questions
1. What is the LM393 LDR Sensor Module?
It is a light detection module that uses an LDR and LM393 comparator to detect changes in ambient light.
2. What outputs does it provide?
It provides both analog (AO) and digital (DO) outputs.
3. Can the sensitivity be adjusted?
Yes. The onboard potentiometer allows adjustment of the digital trigger threshold.
4. What voltage does the module require?
It operates from 3.3V to 5V DC.
5. Can I use it with Arduino?
Yes. Both the analog and digital outputs can be connected to suitable Arduino inputs.
6. Can I use it with ESP32?
Yes. The module can be used with ESP32, provided the analog/digital signal levels are suitable for the selected pins.
7. What is the difference between AO and DO?
AO provides a variable analog signal based on light intensity, while DO provides a threshold-based HIGH/LOW trigger.
8. Does the module have indicator LEDs?
Yes. It includes a power LED and digital output indicator LED.
9. What is the sensor used for?
It can be used for automatic lighting, robotics, security, light monitoring, and smart-home applications.
10. How do I calibrate the sensor?
Use a small screwdriver to adjust the onboard potentiometer while changing the light falling on the LDR until the digital output switches at the desired threshold.Only logged in customers who have purchased this product may leave a review.
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