Description

The BH1750FVI (GY-30) is a high-precision digital ambient light sensor module that measures light intensity in Lux. Unlike simple photoresistors (LDRs), this module provides a direct digital output through an I2C interface, eliminating the need for complex analog-to-digital conversions on your microcontroller.

Its spectral response is designed to closely mimic the human eye, making it ideal for smart lighting systems, auto-adjusting displays, and IoT weather stations.

Key Features

• Direct Lux Output: Built-in 16-bit AD converter provides light intensity in Lux (lx) without the need for manual calculations.
• Human Eye Response: Spectral sensitivity is tuned to match how humans perceive light levels.
• Broad Measurement Range: Can detect light levels from 1 to 65,535 lx (expandable up to 100,000 lx).
• Minimal Interference: Highly resistant to infrared radiation and does not depend heavily on the light source (works with sunlight, LEDs, or incandescent lamps).
• Dual Addressable: Supports two I2C addresses, allowing you to use two sensors on the same bus.

Technical Specifications

Pin Configuration

• VCC: Power Supply (3.3V – 5V)
• GND: Ground
• SCL: I2C Clock Line
• SDA: I2C Data Line
• ADDR: I2C Address Select Pin
• Pulled Low (default): Address is 0x23
• Pulled High (VCC): Address is 0x5C

Applications

• Smart Home: Automatic curtain or blind control and indoor lighting adjustment.
• Photography: Used as a digital lux meter for scene lighting calibration.
• Devices: Auto-brightness control for LCD displays and smartphones.
• Agriculture: Monitoring light exposure for indoor farming or greenhouses.
• Technical Note: This module typically includes pull-up resistors on the I2C lines, making it ready to use with platforms like Arduino, ESP32, or Raspberry Pi immediately.