BH1750 Digital Light Sensor
Digital lux sensor for lighting, solar and comfort projects.
AI Ready Overview
Quick Summary
BH1750 is a light sensor commonly used in FYP and embedded projects. It is best for light level monitoring and solar tracker study, with wiring and testing planned around Arduino, ESP32, Raspberry Pi.
Difficulty
Beginner
Time Required
1-3 days for basic wiring and sample code; 1 week if used inside a complete FYP prototype
Cost
RM5-RM18 module range in Malaysia; full project cost depends on scope.
Components
BH1750, Arduino, ESP32, Raspberry Pi
Overview
What is BH1750?
BH1750 measures light intensity in lux over I2C. It gives more report-friendly light readings than a simple LDR divider.
Engineering Reference
Quick Specs
| Operating Voltage | 3.3V / 5V module variants |
|---|---|
| Interface | I2C |
| Difficulty | Beginner |
| Typical Malaysia Price | RM5-RM18 |
| Best For | Light level monitoring, Solar tracker study |
Real Usage Notes
Suitable / Not Suitable
Suitable for
- ✓ Light level monitoring
- ✓ Solar tracker study
- ✓ Room comfort dashboard
Not suitable for
- ✕ Color measurement
- ✕ Camera exposure analysis
- ✕ Outdoor waterproof sensing without enclosure
Build Planning
Difficulty
BH1750 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: RM5-RM18. 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 module variants before wiring.
GND
Common ground with the controller and external supply.
I2C
Main I2C connection used by the module.
IO
Additional signal pins depend on the exact module variant.
Platform Notes
Wiring Guides
BH1750 with Arduino / ESP32
Connect power, ground and the I2C signal lines. Use level shifting when a 5V module connects to a 3.3V controller.
| BH1750 VCC | 3.3V |
|---|---|
| BH1750 GND | Controller GND |
| Signal pins | I2C |
Fix Common Problems
Troubleshooting
Troubleshooting
Common Mistakes
FYP Ideas Using BH1750
Related Projects
Compare Options
Alternative Components
Student Questions
FAQ
Is BH1750 good for FYP projects?
Yes, BH1750 is suitable for FYP work when the project matches its limits: Light level monitoring and Solar tracker study.
What is the most common BH1750 mistake?
Using without light shielding