VEML7700 I2C Bus Interface Ambient Light Sensor Module

VEML7700 I2C Bus Interface Ambient Light Sensor Module is a high-accuracy, high-sensitivity digital ambient light sensor designed to mimic the human eye’s response to light intensity. This advanced module utilizes the Vishay VEML7700 sensor chip, which integrates a highly sensitive photodiode, a low-noise amplifier, and a 16-bit Analog-to-Digital Converter (ADC) into a single compact device. Furthermore, the sensor communicates via a standard I²C bus interface, making it exceptionally easy to integrate with microcontrollers such as Arduino, ESP32, and Raspberry Pi. Consequently, developers can achieve precise illuminance measurements ranging from 0 lx to 120 klx with software-programmable gain and integration times. Therefore, this module represents an ideal solution for systems requiring reliable light detection under various lighting conditions, from pitch-dark environments to bright sunlight.

Key Features:

• High Dynamic Range: The sensor detects light levels from 0.0036 lx up to 120,000 lx, providing versatility for both indoor and outdoor applications.
• Human Eye Spectral Response: It features Filtron™ technology, which ensures the spectral sensitivity remains close to the human eye’s photopic vision.
• I²C Interface: The module uses a standard I²C bus for data communication, supporting clock frequencies up to 400 kHz for rapid data retrieval.
• Programmable Settings: Users can adjust integration times and gain settings through software to optimize sensitivity for specific environment requirements.
• Low Power Consumption: It includes a dedicated shutdown mode, reducing current draw to ≈ 0.5 μA when the device is inactive.

Technical Specifications:

• Operating Voltage (V_CC): 3.3 V to 5 V (Module typically includes an on-board regulator)
• I²C Bus Voltage: 3.3 V / 5 V compatible
• Resolution: 16-bit Digital Output
• Ambient Light Range: 0 lx to 120,000 lx
• Peak Sensitivity Wavelength: 550 nm
• I²C Address: 0x10 (7-bit)
• Operating Temperature: −25°C to +85°C

Mechanical Specifications:

• Sensor Chip: Vishay VEML7700
• PCB Material: High-quality FR-4 glass epoxy
• Connector Type: Standard 5-pin male header
• Mounting: Includes a small mounting hole for secure physical installation.

Dimensions:

• Module Length: ≈ 16.5 mm
• Module Width: ≈ 13.5 mm
• PCB Thickness: 1.6 mm
• Header Pitch: 2.54 mm (0.1 inch)

Pinout and Wiring:

• VCC: Connect to the power supply (3.3 V or 5 V).
• GND: Connect to the system ground.
• SCL: I²C Serial Clock line; connect to the SCL pin of your MCU.
• SDA: I²C Serial Data line; connect to the SDA pin of your MCU.
• INT: Interrupt output pin (Active Low); however, you may leave this disconnected if interrupt-driven sensing is not required.

Datasheet Reference:

• Download Vishay VEML7700 Ambient Light Sensor Datasheet

Commonly Used in:

• Display Backlight Control: Automatically adjusting the brightness of LCD and OLED screens based on surrounding light.
• Smart Home Hubs: Providing data for automated window blinds and smart lighting systems.
• Weather Stations: Measuring solar intensity and cloud cover for environmental monitoring.

Applications:

• Energy Management: Saving power in mobile devices by dimming screens in dark rooms.
• Industrial Automation: Monitoring lighting conditions in greenhouses or factory floors to ensure optimal productivity.
• Optical Switches: Acting as a non-contact light-activated trigger for specialized equipment.

Equivalent Models:

• TSL2561: A popular digital light sensor, however, it offers a different spectral response and dynamic range compared to the VEML7700.
• BH1750: A common 16-bit light sensor that provides direct lux output via I²C.
• MAX44009: An ultra-low power ambient light sensor featuring a wide dynamic range and similar I²C interface.

Package Includes:

• 1 x VEML7700 I2C Bus Interface Ambient Light Sensor Module
• 1 x 5-Pin Straight Male Header