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- This is the LDR Sensor Module (Pack of 25)
- 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.
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 high when the external ambient light intensity exceeds a set threshold, the module D0 output 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;
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Package Includes:
- 25 x LDR Sensor Module
Specifications:
| Operating Voltage | 3.3V to 5V DC |
| Operating Current | 15ma |
| Dimensions | 5 x 4 x 3cms |
| Weight | 50 grams |
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?
- The resistance of the LDR increases as the light level decreases. As this resistance rises in comparison to the other resistor, which has a fixed resistance, the voltage dropped across the LDR rises as well.
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 is the use of the LDR sensor? 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.