Attributes

Brand	-
Category	Robotics / STEM Teaching Tools / Sensors
Origin	-
Model Number	GY-30 / BH1750FVI
Operating Voltage	3.3V - 5V DC
Interface Type	I2C (Two-Wire Serial)
Measurement Range	1 - 65535 Lux
Resolution	1 Lux
Spectral Response	Close to Human Eye Sensitivity
Conversion Time	Approx. 120ms
Board Dimensions	22mm x 18mm x 3mm
Mounting Holes	2 x 3mm Diameter
Compatibility	Arduino, Raspberry Pi, ESP32, STM32

6 reviews

Anonymous

Mar 25, 2026

Rating: 4/5

Good accuracy, easy setup

Used this to automate my living room lights based on ambient light. It's quite accurate compared to my phone's sensor. Only wish the pins were labeled more clearly on the back.

Anonymous

Mar 25, 2026

Rating: 5/5

Reliable I2C communication

Integrated this into a mobile robot for line following and environmental mapping. The I2C address is standard, and it plays nice with other sensors on the bus.

Anonymous

Mar 16, 2026

Rating: 4/5

Works well outdoors with protection

I enclosed it in a waterproof case for my garden monitoring system. It handles sunlight variations well, though direct noon sun maxes out the reading slightly.

Anonymous

Mar 14, 2026

Rating: 5/5

Perfect for Arduino Projects

This sensor works flawlessly with my Arduino Uno. The library support is excellent, and reading lux values was straightforward. Great value for the price.

Anonymous

Mar 08, 2026

Rating: 5/5

Great starter sensor

As a beginner, I found this very easy to wire up. Plenty of tutorials online. It responded immediately to changes in light intensity in my room.

Anonymous

Mar 07, 2026

Rating: 5/5

Consistent readings

Very stable output. No noisy data spikes like some cheaper photoresistors. The digital output saves me from having to calibrate an ADC.

5 FAQ

Q: Can I use this to measure UV index?

A: No, this sensor measures visible light intensity (Lux) and is calibrated to human eye sensitivity. It does not specifically measure UV radiation.

Q: What is the default I2C address for this sensor?

A: The default I2C address is typically 0x23. Some variants may use 0x5C depending on the ADDR pin configuration, but 0x23 is the most common for this breakout.

Q: Does this module work with 5V logic levels directly?

A: Yes, the GY-30 module includes a voltage regulator and level shifting, so it can be safely connected to 5V microcontrollers like the Arduino Uno.

Q: How do I change the measurement resolution?

A: Resolution is changed via software commands sent over I2C. You can select between High, Low, or Auto-resolution modes by writing specific configuration bytes to the sensor.

Q: Is there a library available for ESP32?

A: Yes, there are several open-source libraries available in the Arduino IDE Library Manager that support the BH1750 sensor on ESP32 platforms.

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