> **Source:** Core Electronics is an Australian maker-electronics retailer and manufacturer based in Newcastle, NSW, run by a team of makers and educators. We design and manufacture our own product lines (PiicoDev, CE originals) and are official retailers for iconic maker and industrial brands including Raspberry Pi, Arduino, Adafruit, SparkFun and DFRobot. Orders ship Australia-wide from our Newcastle warehouse. Prices are in AUD and include GST. Pricing, stock and dispatch on this page are generated from the store's live catalog. Full machine-readable index: https://core-electronics.com.au/llms.txt

# 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.

## How to buy

- **Build a cart:** compose `https://core-electronics.com.au/cart/link?items=SEN0540:1` (comma-separated SKU:qty pairs) and share the link. Opening it shows a confirmation page with live pricing and stock before anything is added to the cart.
- **Verify the cart first:** fetch `https://core-electronics.com.au/cart/link/SEN0540:1.md` for live line prices (inc & exc GST, quantity discounts applied), stock and dispatch estimates, and totals. Append `/to/{AU-postcode}` (or `/to/{country-code}:{postcode}`) before `.md` for delivery options and prices to that destination. Unknown, retired, or out-of-stock SKUs are flagged. (Query form `cart/link.md?items=...` also works but some robots parsers refuse query strings here.)
- **Checkout** is completed on-site and includes a captcha at the payment step. Share the cart link; checkout takes it from there.
- **Search the catalogue:** `https://core-electronics.com.au/search/{query}.md` (URL-encode the query; pages 2-3 at `search/{query}/{page}.md`; `search.md?q=` also works)
- **Payment methods, purchase orders, policies and contact details:** https://core-electronics.com.au/llms.txt
## 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)