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Light & Imaging Sensors

Gravity: LTR390 UV Light Sensor

SKU: SEN0540

The Gravity LTR390 UV light sensor is designed for ambient light and UV detection, featuring high sensitivity and anti-interference capabilities, with data output via I2C or UART, making it suitable for light experiments and UV monitoring.

Front of LTR390 UV sensor module with labeled components and USB port-DFRobot product sku:SEN0540 image.

Downloadable Resources

  • Docs
  • Tech Specs
  • Projects
    • 1. Example Code for Arduino-Ambient Light (I2C Mode)

    This article explains how to use the LTR390UV sensor with Arduino to measure ambient light intensity in I2C mode, including hardware setup, software installation, wiring instructions, and a sample code for accurately capturing light data.
    2. Example Code for Arduino-Ambient Light (UART Mode)

    The article offers a detailed guide on using Arduino and the LTR390-UV sensor to measure ambient light in UART mode, including hardware and software setup, wiring instructions, and sample code for obtaining accurate light intensity readings.
    3. Example Code for Arduino-UV Light (I2C Mode)

    This article provides a comprehensive guide on setting up and coding the Gravity: LTR390-UV Sensor with an Arduino in I2C mode, covering hardware and software preparation, wiring diagrams, and sample code execution to measure ultraviolet radiation effectively.
    4. Example Code for Arduino-UV Light (UART Mode)

    This article offers a comprehensive guide on using the LTR390-UV sensor with an Arduino UNO R3 in UART mode. It includes hardware and software setup, connection diagrams, sample code, and expected results for UV light measurement, providing readers with the necessary tools to implement accurate UV sensing in their projects.
    Reference

    Specification

    Parameter Value
    MCU LTR390-UV-01
    Operating Voltage DC 3.3V to 5V
    Operating Current about 2.73mA (18-bit data acquisition with a time of 100ms)
    Communication Interface I2C/UART
    I2C Address 0x1C
    UV Response Wavelength 280nm to 430nm
    ALS Spectral Response Wavelength 450nm to 700nm
    Output Type digital output
    Dimension 32mm×27mm/1.26×1.06"

    Pinout

    SEN0540-layout diagram

    Label Full Name Description
    D/T SDA/TXD I2C Data Line/UART Transmit Data
    C/R SCL/RXD I2C Clock Line/UART Receive Data
    - Power -
    + Power + (DC 3.3V-5V)

    Note: Select I2C or UART mode by DIP switch.

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