The BH1750FVI is a calibrated digital ambient light sensor IC that measures incident light intensity and converts it directly into a 16-bit digital value. Unlike simple photoresistors (LDRs), this sensor provides a precise output in Lux (lx), and its spectral response is designed to closely mimic the human eye.

Specifications

• Sensor Chip: BH1750FVI (ROHM)
• Supply Voltage: DC 3V to 5V (On-board voltage regulator)
• Light Intensity Range: 0 to 65535 Lux
• Interface: I2C Bus
• Resolution: 1 Lux (High-resolution mode) / 4 Lux (Low-resolution mode)
• Spectral Sensitivity: Peak wavelength typically 560nm (Visible light)
• Operating Temperature: -40 to 85 degrees Celsius
• Dimensions: 13.9mm x 18.5mm (GY-302 module)

Features

• Direct Digital Output: Provides light intensity readings directly in Lux via I2C, eliminating the need for complex analog calculations or manual calibration.
• Human Eye Response: The spectral response function closely matches the human eye, making it ideal for accurate ambient light detection.
• Low Infrared Sensitivity: Highly resistant to infrared radiation, ensuring consistent readings across various light sources like sunlight, LEDs, and fluorescent lamps.
• Adjustable I2C Address: The 7-bit I2C address is 0x23 by default, but can be changed to 0x5C by pulling the ADDR pin to VCC.
• Integrated Level Shifting: Typically includes internal communication level conversion for direct connection to 5V microcontrollers like Arduino.
• Low Power Consumption: Features a power-down function that reduces current draw to nearly zero when the sensor is inactive.

Common Applications

• Automatic screen brightness adjustment for displays and LCD TVs.
• Smart home lighting systems and automatic street lamp control.
• Agricultural monitoring for greenhouses and indoor gardens.
• Digital camera exposure control and handheld light meters.