# Gravity: LTR390 UV Light Sensor (280nm to 430nm) - I2C & UART

**Type:** Product page · **SKU:** SEN0540 · **Brand:** [DFRobot](https://core-electronics.com.au/brands/dfrobot-australia)
**Page:** https://core-electronics.com.au/gravity-ltr390-uv-light-sensor-280nm-to-430nm-i2c-uart.html ([markdown](https://core-electronics.com.au/gravity-ltr390-uv-light-sensor-280nm-to-430nm-i2c-uart.html.md))

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...

## Pricing

- **Price:** $14.25 (inc GST) — $12.95 AUD, exc GST
- **Quantity discounts:** 6+ $12.31 (exc GST) · 12+ $11.79 (exc GST)

## Availability & dispatch

- In stock, ships same business day if ordered before 2PM (Australia/Sydney).
- We can dispatch 2 today, and up to 33 more in 8–12 days.

## Description

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](https://core-electronics.com.au/attachments/localcontent/I2CConnectionDiagram_7789144e573.png)**

**I2C Connection Diagram**

**![Gravity: LTR390 UV Light Sensor UART Connection Diagram](https://core-electronics.com.au/attachments/localcontent/UARTConnectionDiagram_7708184f286.png)**

**UART Connection Diagram**

###  Features

8. Support I2C and UART communication
9. 3.3V & 5V compatible
10. 13 to 20 bits effective resolution
11. Adjustable gain range: 1, 3, 6, 9 and 18
12. Interrupt function, programmable upper and lower thresholds
13. Close to human eye spectral response
###  Applications

15. UV intensity detection
16. Light intensity detection
17. Weather experiments for teaching
18. Light detection experiments
19. Devices for monitoring UV index
20. Devices for outdoor UV detection
###  Specification

22. Chip: LTR390-UV-01
23. Operating Voltage: DC 3.3V to 5V
24. Operating Current: about 2.73mA (18-bit data acquisition with a time of 100ms)
25. Communication Interface: I2C, UART
26. UV Response Wavelength: 280nm to 430nm
27. ALS Spectral Response Wavelength: 450nm to 700nm
28. Output Type: digital output
29. Dimension: 32mm×27mm/1.26×1.06”
###  Documents

31. [Product wiki](https://wiki.dfrobot.com/SKU_SEN0540_Gravity_LTR390_UV_Sensor)
32. [STP 3D Model](https://core-electronics.com.au/attachments/localcontent/ddf9086da451f726516251f3745b74b6_38410e65bb4.rar)
33. [2D CAD Dimension](https://core-electronics.com.au/attachments/localcontent/0078d40f9ec97cbad222090aee5906f7_35339a2c1e7.rar)
34. [2D\_CAD](https://core-electronics.com.au/attachments/localcontent/e2d2e3199645816bc85830e8bdd2355a_57901f5a325.pdf)
35. [Schematics](https://core-electronics.com.au/attachments/localcontent/%5BSEN0540%5DGravity%C3%AF%C2%BC%C5%A1LTR390-UVsensor(V1_15346e67c73.pdf)
36. [UV Datasheet](https://core-electronics.com.au/attachments/localcontent/41c7a0d91c5a10e43afa2839378da3b3_19683361825.pdf)
###  Parts List

38. Gravity: LTR390-UV Sensor × 1
39. Gravity-4P I2C/UART Sensor Cable × 1

## Images

- [Product image 1](https://core-electronics.com.au/media/catalog/product/S/E/SEN0540-1.jpg)