DFRobot
Gravity: LTR390 UV Light Sensor (280nm to 430nm) - I2C & UART
The Gravity LTR390-UV sensor provides both ambient light and UV sensing with a UV spectral response from 280nm to 430nm. It features high sensitivity, quick ...
The Gravity LTR390-UV sensor provides both ambient light and UV sensing with a UV spectral response from 280nm to 430nm. It features high sensitivity, quick response, and strong anti-interference performance.
With a built-in ADC and MCU, the module converts light data to digital output via I2C or UART interface. It supports programmable interrupt thresholds and adjustable gain settings, making it suitable for UV index monitoring, weather experiments, and light detection projects.
Key Features
- Dual Interface – I2C and UART communication
- 3.3V & 5V Compatible – Works with a wide range of controllers
- 13–20 Bit Resolution – Adjustable effective resolution
- Adjustable Gain – 1, 3, 6, 9, and 18× settings
- Interrupt Function – Programmable upper and lower thresholds
- Human Eye Response – ALS spectral response close to human eye sensitivity
Specifications
- Chip – LTR390-UV-01
- Operating Voltage – 3.3V to 5V DC
- Operating Current – ~2.73mA (18-bit, 100ms acquisition)
- UV Response – 280nm to 430nm
- ALS Response – 450nm to 700nm
- Output – Digital (I2C / UART)
- Dimensions – 32 × 27mm (1.26" × 1.06")
Ideal For
- UV index monitoring devices
- Outdoor UV detection
- Weather station experiments
- Ambient light sensing
Package Contents
- 1× Gravity LTR390-UV Sensor
- 1× Gravity 4-pin I2C/UART sensor cable
Resources
Jargon buster
Plain-language definitions for the technical terms used above.
- ADC
- An analogue-to-digital converter reads a changing voltage and turns it into a number the microcontroller can use. It matters when connecting analogue sensors such as light, sound, or variable-resistor sensors.
- Gravity
- Gravity is DFRobot’s plug-in connector system for sensors, motors and modules, using standard cables to reduce loose jumper wiring. It matters because Gravity-compatible parts can connect directly to these ports, while non-Gravity parts may need adapters or manual wiring.
- I2C
- I2C is a two-wire communication bus used by many sensors and small modules. It matters because several I2C devices can share the same two wires, but each device needs a compatible address and your controller must support I2C.
- UART
- UART is a simple serial connection that sends data over separate transmit and receive wires, often labelled TX and RX. It matters because this module is designed to replace a wired UART cable with a wireless link while keeping the same serial data format.
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Brands
Sensors & Input
Gravity LTR390 UV Sensor Schematic
Schematic · 149.9 KB · Click any page to view full size
Supplier page — dfrobot.com
Supplier Description · 687.2 KB · Click any page to view full size
Related Tutorials
Free guides on learn.littlebird.com.au
