GY-302 BH1750 Light Intensity Illumination Module

Description

Product Overview

The GY-302 BH1750 Light Intensity Illumination Module is a sophisticated digital ambient light sensor that provides precise illuminance measurements directly in Lux (lx) via the I2C interface. Unlike traditional Light Dependent Resistors (LDRs) that require complex analog calculations and calibration, this module features a built-in 16-bit Analog-to-Digital Converter (ADC) and outputs calibrated light intensity data directly—no additional math or calibration required .

Manufactured by ROHM Semiconductor, the BH1750FVI chip is designed to detect a wide range of light levels from 1 to 65,535 lux with high resolution, making it suitable for applications ranging from dimly lit rooms to bright outdoor environments . Its spectral response is specifically optimized to closely match the sensitivity of the human eye, ensuring that the sensor measures brightness as humans perceive it, rather than being influenced by infrared or ultraviolet light .

The GY-302 module includes onboard level shifting, making it directly compatible with both 3.3V and 5V microcontrollers such as Arduino, ESP32, ESP8266, Raspberry Pi, and STM32 without requiring external level converters . Whether you are building automatic screen brightness adjustment systems, greenhouse lighting controls, weather stations, or smart home automation, this module offers plug-and-play simplicity with accurate, repeatable results.

Key Features

• Direct Digital Output: Built-in 16-bit ADC outputs calibrated lux values—no complex analog calculations or calibration required 

• Wide Measurement Range: Detects illuminance from 1 to 65,535 lux (extendable to 0.11 – 100,000 lx via MTreg adjustment), covering everything from dark rooms to bright sunlight 

• Human-Eye Spectral Response: Spectral sensitivity closely matches the human eye (peak at approximately 560nm), providing accurate brightness measurements as perceived by humans 

• I2C Digital Interface: Simple 2-wire communication (SDA, SCL) with selectable slave addresses (0x23 or 0x5C via ADDR pin), allowing multiple sensors on the same bus 

• Dual Voltage Compatibility: Operates on 3V-5V power with onboard level shifting; directly compatible with both 3.3V (ESP32, ESP8266) and 5V (Arduino) microcontrollers 

• Low Power Consumption: Active measurement current as low as 120µA with power-down mode reducing consumption to near zero when idle 

• Built-in Noise Rejection: Integrated 50Hz/60Hz light noise rejection filters ensure stable readings under fluorescent and artificial lighting 

• Adjustable Sensitivity: MTreg (measurement time register) can be modified to adjust sensitivity, allowing for optical window compensation and extended measurement range 

• No External Components Required: Fully self-contained sensor—no external resistors, capacitors, or calibration needed for operation 

Technical Specifications