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Front of LTR390 UV sensor module with labeled components and USB port-DFRobot product sku:SEN0540 image.
angled shot of LTR390 UV sensor showing ambient light and UV detection capabilities
Angled shot of the back of LTR390 UV sensor module with ambient light detection and LED indicators.
angled shot of back of LTR390 UV sensor module with ambient light detection
Angled shot of front of LTR390 UV sensor module showing ambient light and UV detection
angled shot of UV sensor measuring ambient light during performance
Detail of Gravity LTR390 UV sensor module showing ambient light and UV detection specs
angled shot of LTR390 UV sensor details showing ambient light and UV spectral response 280-430nm
Overhead shot of LTR390 UV sensor module with ambient light detection.

Gravity: LTR390 UV Light Sensor (280nm-430nm, UVA, UVB)

$7.90
SKU: SEN0540
Volume Discount
  • $7.80 2+ items
  • $7.60 5+ items
  • $7.40 10+ items
This sensor provides ambient light and UV detection, with high sensitivity and anti-interference. It outputs digital signals via I2C/UART for various applications.
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  • I2C & UART, 240~370nm
    I2C & UART, 240~370nm
    $8.00
  • Analog, 200~370nm
    Analog, 200~370nm
    $5.90
  • I2C & UART, 280~430nm
    I2C & UART, 280~430nm
    $7.90
IntroductionFeaturesApplicationsSpecificationDocumentsShipping List Resource Review

Introduction

This Gravity: LTR390-UV sensor from DFRobot provides both ambient light and UV sensing with UV spectral response from 280nm to 430nm and raw data output. It features high sensitivity, quick response, and strong anti-interference ability.

With built-in ADC and MCU, this UV module can convert light data to a digital signal capable of being output via I2C or UART interface. It can be used for light experiments, outdoor UV detection, and other scenarios requiring UV or ambient light monitoring.

Gravity: LTR390 UV Light Sensor I2C Connection Diagram

I2C Connection Diagram


Gravity: LTR390 UV Light Sensor UART Connection Diagram

UART Connection Diagram

Features

  • Support I2C and UART communication
  • 3.3V & 5V compatible
  • 13 to 20 bits effective resolution
  • Adjustable gain range: 1, 3, 6, 9 and 18
  • Interrupt function, programmable upper and lower thresholds
  • Close to human eye spectral response

    • Applications

  • UV intensity detection
  • Light intensity detection
  • Weather experiments for teaching
  • Light detection experiments
  • Devices for monitoring UV index
  • Devices for outdoor UV detection

    • Specification

  • Chip: 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
  • UV Response Wavelength: 280nm to 430nm
  • ALS Spectral Response Wavelength: 450nm to 700nm
  • Output Type: digital output
  • Dimension: 32mm×27mm/1.26×1.06”

    • Documents

    Shipping List

  • Gravity: LTR390-UV Sensor × 1
  • Gravity-4P I2C/UART Sensor Cable × 1

    • Resource

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    Niu.yx
    Feb 11, 2025

    Review

    Mike. Jan 30, 2026

    works really well just need more info on UV levels etc.

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    Gravity: LTR390 UV Light Sensor (280nm-430nm, UVA, UVB)
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