BH1750 Digital Ambient Light Sensor Module

Measure real-world brightness accurately with the BH1750 Digital Ambient Light Sensor Module, built around the ROHM BH1750FVI IC. Unlike a basic photoresistor that only gives you a rough analog voltage to interpret, this sensor outputs a true digital lux value directly over I2C, so there’s no need for manual calibration or voltage-to-lux conversion math in your code.

The module features a 16-bit ADC that converts ambient illuminance into a precise digital reading across a wide range of 1 to 65,535 lux, with a photodiode response tuned to closely match human eye sensitivity for realistic brightness measurement. An onboard 3.3V regulator and I2C pull-up resistors make the module compatible with both 3.3V and 5V microcontroller systems, and the ADDR pin lets you run two sensors on the same I2C bus by switching between two selectable addresses.

This makes it a popular choice for hobbyists and engineers building auto-brightness display controllers, smart home lighting systems, sun trackers, greenhouse light monitors, and photography light meters. It works seamlessly with Arduino, ESP32, ESP8266, and Raspberry Pi, with mature libraries available for both continuous and one-shot low-power measurement modes.

Specification:

• Sensor IC : BH1750FVI
• Measurement Range : 1 to 65,535 lux
• Resolution : 16-bit
• Communication Interface : I2C
• Operating Voltage : 2.4V to 3.6V (5V tolerant with onboard regulator)
• I2C Address : 0x23 (default) or 0x5C (ADDR pin high)
• Accuracy : ±20%