Digital LDR Module – Light Sensor
Original price was: ₹50.00.₹35.00Current price is: ₹35.00.
Features:
✅ Simple to use, plug-and-play.
✅ Adjustable sensitivity using potentiometer.
✅ Low power consumption.
✅ Fast switching compared to analog readings.
✅ Useful in light detection, automatic street lights, daylight sensing, and DIY projects.
Applications:
🔹 Automatic night lamp.
🔹 Smart curtains that close when light is high.
🔹 Light intensity alarms.
🔹 Robotics line-following sensors (combined with reflective surfaces).
🔹 Security systems to detect sudden darkness (hand covering sensor).
Out of stock
What is a Digital LDR Module?
A Digital LDR Module is a light sensor module that uses an LDR (Light Dependent Resistor) along with a comparator circuit to provide a digital HIGH/LOW output based on light intensity.
Unlike analog LDR modules that give variable voltage output, digital LDR modules output either 0 (LOW) or 1 (HIGH) depending on whether the light level crosses a threshold.
Key Components:
- LDR: Detects light intensity.
- Comparator (LM393): Compares LDR voltage with a reference set using an onboard potentiometer.
- Potentiometer: Adjusts the sensitivity (light threshold).
- Indicator LED: Shows output state.
- Output Pin: Provides digital signal (0/1) for microcontroller input.
How it Works:
1. Light falls on the LDR → its resistance changes:
-
-
- Bright light → lower resistance → higher voltage at comparator input.
- Low light → higher resistance → lower voltage at comparator input.
-
2. Comparator compares this voltage with the reference set by the potentiometer.
3. Output:
- LOW (0): when light intensity is above the set threshold.
- HIGH (1): when light intensity is below the set threshold.
4. Connect to Arduino, ESP32, Raspberry Pi or any microcontroller to detect light/dark states for automation projects.
Typical Pinout:
- VCC: +5V (or 3.3V on some modules).
- GND: Ground.
- DO: Digital output (0/1 based on light level).
| Weight | 5 g |
|---|
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