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LDR Sensor Module

LDR Sensor Module

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  • This is the LDR Sensor Module
  • LDR Sensor Module can detect ambient brightness and light intensity
  • Adjustable sensitivity (via blue digital potentiometer adjustment)
  • Output Digital – 0V to 5V, Adjustable trigger level from preset
  • LEDs indicating output and power. Power indicator (red) and the digital switch output indicator (green)
  • Using LM393 comparator chip, stable
  • This is easy to install

LDR Sensor Module

The LDR sensor Module is used to detect the presence of light and measure the intensity of light. The output of the module goes high in the presence of light and it becomes low in the absence of light. The sensitivity of signal detection can be adjusted using the potentiometer. You can adjust the threshold (sensitivity) of the digital output by tuning the onboard variable resistor (potentiometer). Simple usage as it is the digital output, so you will know the light present and decide what to do with it.

LDR sensor Module comes with an M3 mounting hole for ease of attaching it to an object. Onboard, it provides an LDR, high sensitivity and commonly being used for light detection. The module comes with a power LED and a status LED as an indicator. LDR Module Photosensitive resistor module most sensitive to environmental light intensity is generally used to detect the ambient brightness and light intensity.

If you want to use the LDR module in your projects, then you will need a few essential components like an Arduino , relays , breadboard and jumper wires.


  • Adjustable sensitivity via blue digital potentiometer adjustment
  • Digital output range: 0V to 5V
  • Adjustable trigger level from preset
  • LEDs indicating output and power (Power indicator in red and digital switch output indicator in green)
  • Uses LM393 comparator chip for stability
  • Easy to install with an M3 mounting hole for attachment
  • Suitable for detecting ambient brightness and light intensity
  • Digital output for easy integration with microcontrollers
  • Comes with a power LED and status LED as indicators


  • LDR sensor modules are commonly used in automatic outdoor lighting systems to detect ambient light levels and control the switching on and off of lights.
  • They are utilized in streetlights to adjust the brightness based on the surrounding light conditions, saving energy and enhancing visibility.
  • LDR sensors find applications in security systems to trigger alarms or lights when there is a sudden change in light intensity, indicating potential intrusions.
  • These sensors are employed in agricultural automation to monitor sunlight levels for optimal plant growth and regulate greenhouse environments.
  • LDR sensor modules are also used in camera exposure control systems to adjust the camera settings based on available light for better photography outcomes.

LDR Sensor Module pin diagram

LDR Sensor Module pin diagram

Pin No Pin Name Description
1 VCC 3.3V to 5V DC power supply
2 GND Ground
3 DO Digital output

How to Use:

  • A photosensitive resistor module most sensitive to environmental light intensity is generally used to detect the ambient brightness and light intensity.
  • Module light conditions or light intensity reach the set threshold, DO port output is high when the external ambient light intensity exceeds a set threshold, the module D0 output is low;
  • Digital output D0 is directly connected to the MCU, and detects high or low TTL, thereby detecting ambient light intensity changes;
  • Digital output module DO  can directly drive the relay module, which can be composed of a photoelectric switch;

Read our blog explaining how LDR works, detailing what is an LDR, how LDR Works in Street Lights, what are the types of LDR, how to make an LDR Sensor Module and applications of an LDR Sensor.

Check out our collection of sensor at great prices!

LDR Sensor interfacing with Raspberry Pi

    LDR Sensor interfacing with Arduino

    Package Includes:

    • 1 x LDR Sensor Module


    Operating Voltage 3.3V to 5V DC
    Operating Current 15ma
    Dimensions  5 x 4 x 3cms 
    Weight 50 grams

    Shipping & Returns

    • All orders confirmed before 3 pm IST are shipped on the
      same day, barring rare pickup delays on holidays or disturbances
    • Delivery time in Metro cities is 1-3 days, Others it is
      3-7 days. It varies based on location, reliant on courier services
    • Return window: 7 days from receipt unless stated
      otherwise. No refunds/replacements after
    • Returns only for non-working/damaged products are accepted
    • Initiate return requests to our customer service team via Support ticket or contact us at +91-8123057137
    • Refunds are processed within 3-4 working days post inspection and approval.

    For more details, please check our Shipping and Return Policy

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    1. What is a LDR module?

    The Digital LDR Module detects the presence of light and measures its intensity. The module's output increases in the presence of light and decreases in the absence of light. The potentiometer can be used to adjust the sensitivity of signal detection.

    2. How does an LDR sensor work?

    A LDR sensor works by detecting changes in the amount of light reaching its sensitive surface. When light fades or increases, a potentiometer within the device will convert this change into an electrical signal that can be used to trigger certain events such as turning on lights when it gets dark outside. This can also be useful for automatic dimming of overhead lighting based upon levels detected from sunlight through windows during daytime hours and indoor illumination at night time. 

    3. How to set the threshold voltage of the LDR sensor?

    The LDR sensor module must be connected to a 5v power supply. Then, using the “preset” knob for sensor sensitivity, adjust the threshold voltage at the IC's non-inverting input (3) based on the current light intensity.

    4. What happens when the intensity of light is less in an LDR?

    The light intensity of the space around an LDR Sensor is measured. Similar sensors are used in phones to allow manufacturers to turn off the screen when you put your phone to your ear during a call. When the intensity of light applied to an LDR sensor is reduced, the resistance value increases.

    5. How are LDRs used in alarm clocks?

    When light falls on the LDR sensor, then the resistance of the sensor decreases, which leads to activate an alarm to give an alert to the user

    6. How much tie on average does the LDR take for its resistance to change when light is incident?

    The correct value for the time it takes an average LDR to change resistance in response to a light incident on it is 8 to 12ms. When no light is incident, it takes about a second for the resistance to return to its initial value.

    7. How are LDRs used in street lights?

    The LDR sensor detects the presence of ambient light, allowing the street light to be turned off automatically during the day when the sun is shining brightly. When there is no light at night, the LDR sends a signal to the microcontroller, which turns on the street light.

    8. What is the use of ldr sensor?

    Light dependent resistors, or LDR sensors, are one of the most essential tools used in automation technology. They allow for light to be measured and detected when exposed to different levels of brightness; this is done by using a resistance value that changes within an electrical circuit according to the amount of incoming light present. Through its design features like low cost components, high reliability circuitry and fast response time - these devices can offer significant performance benefits while providing accurate measurement results over large temperature differences. As well as being able to detect simple on-off scenarios with traditional LED lights – more modern designs use special lenses which enable them measure even finer details such as color or intensity information from complex lighting systems. Due largely in part to their versatility, accuracy and affordability – LDRs have become a popular choice among engineers who require reliable sensing solutions at various stages through out product development cycles.

    9. What is the full form of ldr sensor?

    The full form of LDR Sensor is Light Dependent Resistor (LDR) Sensor. This type of sensor utilizes the variation in resistance caused by varying light levels to detect changes in ambient illumination. It has a wide range of applications such as measuring light intensity, controlling lighting or security systems, and obtaining motion detection data from infrared sources. With its cost-effective properties, easy configuration capability and reliable performance making it an ideal solution for many commercial and industrial applications where precise measurements are required.

    10. ldr sensor is made up of which material?

    The LDR sensor is a light-dependent resistor made of cadmium sulfide. This material has unique electrical properties that change when exposed to varying levels of visible and near-infrared radiation (sunlight). As the amount of incident light increases, its resistance drops proportionally which allows for direct mapping on an analog or digital circuit. The use of such sensors in applications like automotive lighting control systems enables improved safety by measuring distance from nearby vehicles and adjusting headlights accordingly at various speeds. More importantly, they can be used as security devices in areas with low visibility since their sensitivity varies based on ambient illumination - making them suitable for home automation projects too!

    11. ldr sensor works on which principle?

    The LDR (Light Dependent Resistor) sensor works on the principle of resistance. When light is shined onto this type of resistor, its electrical resistance decreases based off how much light it can absorb. This change from a high to low value in resistance makes it an ideal choice for detecting levels or changes in ambient lighting conditions and environments. It’s useful for applications such as motion sensing lights, adjusting brightness settings within smart homes or offices, and nighttime activity monitoring in industrial buildings. The versatility behind these types of sensors has made them popular choices across many industries worldwide due to their simple design coupled with reliable performance over time!

    check out the blog on How LDR Sensor Works

    12. How to test ldr sensor?

    Testing a light dependent resistor (LDR) sensor is an important part of utilizing the device in various projects. The first step to ensure proper functioning is to obtain a multimeter that has diode testing capability and measure resistance of LDR when no light falls on it. Depending upon the exact model, detectivity levels may range from 0 ohms for minimum illumination or 1 kohm at ambient brightness level with some having up-to 10kohms for full darkness conditions. This must be verified by adjusting lights around them and checking voltage across load as per requirement set forth by manufacturer’s datasheet guideline specifications during different stages of exposure amount & duration while paying special attention towards identifying any abnormalities such thermal fading over time due to prolonged use etcetera so as not affect long term efficiency accordingly.

    13. How many pins are present in ldr sensor?

    The LDR sensor has two pins that are interchangeable for data and ground, unlike usual resistors with positive and negative sides. This makes it unique and sometimes called a special type of resistor.