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Light Sensitive Photoresistor LDR - Small Form Factor
Compact light-dependent resistor (LDR) for precise ambient light detection. This small-size photoresistor changes its resistance based on light intensity - high resistance in darkness, low resistance in bright light - making it ideal for automatic lighting systems, robotics, and sensor-based projects. Available at The Engineer Store, Bengaluru, with fast shipping and full technical support.
Specifications
| Component Type | Photoresistor / Light Dependent Resistor (LDR) |
| Size | Small (5mm diameter typical) |
| Sensing Material | Cadmium Sulfide (CdS) |
| Dark Resistance | ~1 MOhm (in complete darkness) |
| Light Resistance | ~10-20 kOhm (at 10 lux) / ~2-5 kOhm (at 100 lux) |
| Spectral Peak | ~540 nm (green light, visible spectrum) |
| Max Voltage | 150V DC |
| Max Power Dissipation | 100 mW |
| Response Time | Rise ~20 ms / Decay ~30 ms (typical) |
| Operating Temperature | -30 degreesC to +70 degreesC |
| Mounting | Through-hole (2-pin, breadboard compatible) |
| Origin | Original / Authentic |
| Warranty | 7-day warranty on manufacturing defects |
| Support | Email & WhatsApp 24/7 |
Key Features
- Analog light sensing: Resistance varies smoothly with ambient light intensity for proportional readings
- Compact 5mm form factor: Fits easily on breadboards, perfboards, and tight PCB layouts
- Wide resistance range: From a few kOhm in bright light to over 1 MOhm in darkness for high sensitivity
- Simple 2-pin interface: No complex wiring - works with a basic voltage divider circuit
- Low cost, high reliability: Durable CdS element with consistent performance over thousands of cycles
- Broad operating voltage: Compatible with 3.3V, 5V, and higher voltage circuits
- No polarity: Connect in either direction - no positive or negative terminal to worry about
How It Works
The LDR is made from cadmium sulfide, a semiconductor material whose electrical resistance decreases as light intensity increases. When photons strike the CdS surface, they free electrons, increasing conductivity. By placing the LDR in a voltage divider circuit with a fixed resistor (typically 10 kOhm), you can read the varying voltage on an Arduino or microcontroller analog pin to determine light levels. The small size makes it perfect for embedded applications where space is limited.
Why Choose This LDR?
- 100% authentic components from trusted, verified suppliers
- Tested for consistent dark and light resistance values
- 1-5 day shipping, 7-8 day delivery across India from our Bengaluru warehouse
- Expert technical support to help you integrate into any circuit
- Perfect balance of sensitivity, size, and affordability
Project Ideas
- Automatic Street Light: Detect dusk and dawn to switch lights on/off automatically using Arduino or a simple transistor circuit
- Line-Following Robot: Use multiple LDRs to detect contrast between a dark line and light surface for robot navigation
- Smart Home Light Controller: Adjust indoor LED brightness based on ambient sunlight entering a room
- Security Alarm System: Trigger an alert when a laser beam aimed at the LDR is interrupted
- Weather Station / Data Logger: Log light intensity over time to track cloud cover, sunrise/sunset patterns
- Solar Tracker: Pair two LDRs to detect the sun's position and orient a solar panel for maximum efficiency
- Night Light Circuit: Build a simple analog circuit that turns on an LED automatically when the room gets dark
- Learning & Education: Ideal for teaching voltage dividers, analog-to-digital conversion, and sensor interfacing
Basic Wiring Guide (Arduino)
| LDR Pin 1 | Connect to 5V |
| LDR Pin 2 | Connect to Arduino Analog Pin (A0) AND to GND through a 10 kOhm resistor |
| Circuit Type | Voltage divider (LDR + 10 kOhm fixed resistor) |
| Reading Method | analogRead(A0) - returns 0 (dark) to 1023 (bright light) |
What's in the Box
- 1 x Light
Frequently Asked Questions
When will I receive my order?
Products ship within 1-5 days from our Bengaluru warehouse. Delivery within 7-8 days to most locations across India.
Is technical support available?
Yes, 24/7 support via email and WhatsApp for setup, troubleshooting, and application guidance.
What is your return policy?
7-day returns on manufacturing defects only. Full refund or replacement. Not applicable for user damage or misuse.
Are bulk discounts available?
Yes, wholesale pricing on orders of 10+ units. Contact us via WhatsApp or email for a custom quote.
Buy Light Sensitive Photoresistor LDR Small Online in India
Purchase the Light Sensitive Photoresistor LDR Small online at The Engineer Store - India's most trusted electronics components store. We deliver across all major cities including Bengaluru, Mumbai, Delhi, Chennai, Hyderabad, Pune, Kolkata, Ahmedabad, Jaipur, and Surat. Get the best price on Light Sensitive Photoresistor LDR Small with fast 1-5 day shipping from our Bengaluru warehouse. All products are 100% authentic, sourced from authorized distributors with 7-day warranty on manufacturing defects.
Looking to buy Light Sensitive Photoresistor LDR Small at the best price in India? The Engineer Store offers competitive pricing, bulk discounts for orders of 10+ units, and dedicated technical support via email and WhatsApp. Whether you are a hobbyist, student, or professional engineer, we have everything you need for your electronics projects.
Light Sensitive Photoresistor LDR - Small Form Factor
Compact light-dependent resistor (LDR) for precise ambient light detection. This small-size photoresistor changes its resistance based on light intensity - high resistance in darkness, low resistance in bright light - making it ideal for automatic lighting systems, robotics, and sensor-based projects. Available at The Engineer Store, Bengaluru, with fast shipping and full technical support.
Specifications
| Component Type | Photoresistor / Light Dependent Resistor (LDR) |
| Size | Small (5mm diameter typical) |
| Sensing Material | Cadmium Sulfide (CdS) |
| Dark Resistance | ~1 MOhm (in complete darkness) |
| Light Resistance | ~10-20 kOhm (at 10 lux) / ~2-5 kOhm (at 100 lux) |
| Spectral Peak | ~540 nm (green light, visible spectrum) |
| Max Voltage | 150V DC |
| Max Power Dissipation | 100 mW |
| Response Time | Rise ~20 ms / Decay ~30 ms (typical) |
| Operating Temperature | -30 degreesC to +70 degreesC |
| Mounting | Through-hole (2-pin, breadboard compatible) |
| Origin | Original / Authentic |
| Warranty | 7-day warranty on manufacturing defects |
| Support | Email & WhatsApp 24/7 |
Key Features
- Analog light sensing: Resistance varies smoothly with ambient light intensity for proportional readings
- Compact 5mm form factor: Fits easily on breadboards, perfboards, and tight PCB layouts
- Wide resistance range: From a few kOhm in bright light to over 1 MOhm in darkness for high sensitivity
- Simple 2-pin interface: No complex wiring - works with a basic voltage divider circuit
- Low cost, high reliability: Durable CdS element with consistent performance over thousands of cycles
- Broad operating voltage: Compatible with 3.3V, 5V, and higher voltage circuits
- No polarity: Connect in either direction - no positive or negative terminal to worry about
How It Works
The LDR is made from cadmium sulfide, a semiconductor material whose electrical resistance decreases as light intensity increases. When photons strike the CdS surface, they free electrons, increasing conductivity. By placing the LDR in a voltage divider circuit with a fixed resistor (typically 10 kOhm), you can read the varying voltage on an Arduino or microcontroller analog pin to determine light levels. The small size makes it perfect for embedded applications where space is limited.
Why Choose This LDR?
- 100% authentic components from trusted, verified suppliers
- Tested for consistent dark and light resistance values
- 1-5 day shipping, 7-8 day delivery across India from our Bengaluru warehouse
- Expert technical support to help you integrate into any circuit
- Perfect balance of sensitivity, size, and affordability
Project Ideas
- Automatic Street Light: Detect dusk and dawn to switch lights on/off automatically using Arduino or a simple transistor circuit
- Line-Following Robot: Use multiple LDRs to detect contrast between a dark line and light surface for robot navigation
- Smart Home Light Controller: Adjust indoor LED brightness based on ambient sunlight entering a room
- Security Alarm System: Trigger an alert when a laser beam aimed at the LDR is interrupted
- Weather Station / Data Logger: Log light intensity over time to track cloud cover, sunrise/sunset patterns
- Solar Tracker: Pair two LDRs to detect the sun's position and orient a solar panel for maximum efficiency
- Night Light Circuit: Build a simple analog circuit that turns on an LED automatically when the room gets dark
- Learning & Education: Ideal for teaching voltage dividers, analog-to-digital conversion, and sensor interfacing
Basic Wiring Guide (Arduino)
| LDR Pin 1 | Connect to 5V |
| LDR Pin 2 | Connect to Arduino Analog Pin (A0) AND to GND through a 10 kOhm resistor |
| Circuit Type | Voltage divider (LDR + 10 kOhm fixed resistor) |
| Reading Method | analogRead(A0) - returns 0 (dark) to 1023 (bright light) |
What's in the Box
- 1 x Light
Frequently Asked Questions
When will I receive my order?
Products ship within 1-5 days from our Bengaluru warehouse. Delivery within 7-8 days to most locations across India.
Is technical support available?
Yes, 24/7 support via email and WhatsApp for setup, troubleshooting, and application guidance.
What is your return policy?
7-day returns on manufacturing defects only. Full refund or replacement. Not applicable for user damage or misuse.
Are bulk discounts available?
Yes, wholesale pricing on orders of 10+ units. Contact us via WhatsApp or email for a custom quote.
Buy Light Sensitive Photoresistor LDR Small Online in India
Purchase the Light Sensitive Photoresistor LDR Small online at The Engineer Store - India's most trusted electronics components store. We deliver across all major cities including Bengaluru, Mumbai, Delhi, Chennai, Hyderabad, Pune, Kolkata, Ahmedabad, Jaipur, and Surat. Get the best price on Light Sensitive Photoresistor LDR Small with fast 1-5 day shipping from our Bengaluru warehouse. All products are 100% authentic, sourced from authorized distributors with 7-day warranty on manufacturing defects.
Looking to buy Light Sensitive Photoresistor LDR Small at the best price in India? The Engineer Store offers competitive pricing, bulk discounts for orders of 10+ units, and dedicated technical support via email and WhatsApp. Whether you are a hobbyist, student, or professional engineer, we have everything you need for your electronics projects.