LDR Light Sensor Module
Simple light-dependent resistor module for day/night detection.
AI Ready Overview
Quick Summary
LDR Sensor is a light sensor commonly used in FYP and embedded projects. It is best for automatic lighting and solar tracker, with wiring and testing planned around Arduino, ESP32.
Difficulty
Beginner
Time Required
1-3 days for basic wiring and sample code; 1 week if used inside a complete FYP prototype
Cost
RM2-RM8 module range in Malaysia; full project cost depends on scope.
Components
LDR Sensor, Arduino, ESP32
Overview
What is LDR Sensor?
LDR modules detect brightness changes and are useful for solar tracking, automatic lighting and classroom demos.
Engineering Reference
Quick Specs
| Operating Voltage | 3.3V / 5V |
|---|---|
| Interface | Analog, Digital GPIO |
| Difficulty | Beginner |
| Typical Malaysia Price | RM2-RM8 |
| Best For | Automatic lighting, Solar tracker |
Real Usage Notes
Suitable / Not Suitable
Suitable for
- ✓ Automatic lighting
- ✓ Solar tracker
- ✓ Day/night detection
Not suitable for
- ✕ Accurate lux measurement
- ✕ Fast optical sensing
- ✕ Calibrated industrial lighting
Build Planning
Difficulty
LDR Sensor is rated Beginner. Plan around 1-3 days for basic wiring and sample code; 1 week if used inside a complete fyp prototypedepending on wiring, libraries, calibration, dashboard/app integration and testing evidence.
Build Planning
Time Required
1-3 days for basic wiring and sample code; 1 week if used inside a complete FYP prototype
Malaysia Price Guidance
Cost
Typical module price range: RM2-RM8. This is component guidance only; a complete FYP cost depends on controller, sensors, casing, display, app/dashboard, documentation and timeline.
Connections
Pinout
VCC
Power input. Check whether the module expects 3.3V or 5V before wiring.
GND
Common ground with the controller and external supply.
Analog
Main Analog connection used by the module.
IO
Additional signal pins depend on the exact module variant.
Platform Notes
Wiring Guides
LDR Sensor with Arduino / ESP32
Connect power, ground and the Analog / Digital GPIO signal lines. Use level shifting when a 5V module connects to a 3.3V controller.
| LDR Sensor VCC | 5V or module-rated supply |
|---|---|
| LDR Sensor GND | Controller GND |
| Signal pins | Analog, Digital GPIO |
Fix Common Problems
Troubleshooting
Troubleshooting
Common Mistakes
FYP Ideas Using LDR Sensor
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Alternative Components
Student Questions
FAQ
Is LDR Sensor good for FYP projects?
Yes, LDR Sensor is suitable for FYP work when the project matches its limits: Automatic lighting and Solar tracker.
What is the most common LDR Sensor mistake?
No calibration threshold