# Flora UV Index Sensor - Si1145 Light Sensor

**Type:** Product page · **SKU:** ADA1981 · **Brand:** [Adafruit](https://core-electronics.com.au/brands/adafruit-australia)
**Page:** https://core-electronics.com.au/flora-uv-index-sensor-si1145-light-sensor.html ([markdown](https://core-electronics.com.au/flora-uv-index-sensor-si1145-light-sensor.html.md))

Your wearable can now keep you from getting sunburnt, with the Flora digital UV index sensor. Adafruit took Adafruit's popular SI1145 UV index sensor and cut out everything you...

## Pricing

- **Price:** $15.40 (inc GST) — $14.00 AUD, exc GST
- **Quantity discounts:** 10+ $13.58 (exc GST) · 50+ $13.30 (exc GST)

## Availability & dispatch

- Out of stock — the product page offers email notification when it returns.

## Description

Your wearable can now keep you from getting sunburnt, with the Flora digital UV index sensor. [Adafruit took Adafruit's popular SI1145 UV index sensor](https://core-electronics.com.au/si1145-digital-uv-index-ir-visible-light-sensor.html) and cut out everything you don't need for using with a Flora. It's small, round, and connects to the I2C bus pads. Flora can even use Adafruit's library code to get calibrated light level and UV index data from the sensor.

Please note: this sensor can be used by Flora but is too complex for Gemma!

[To use: connect the 3V, SDA and SCL, and GND pads of the sensor to your Flora 3V/SDA/SCL/GND pads, in that order. Then load up Adafruit's Arduino library and example code from Adafruit's tutorial to your Flora.](https://learn.adafruit.com/adafruit-si1145-breakout-board-uv-ir-visible-sensor)

## Technical Details

SI1145 Details:

- IR Sensor Spectrum: Wavelength: 550nm-1000nm (centered on 800)
- Visible Light Sensor Spectrum: Wavelength: 400nm-800nm (centered on 530)
- Voltage Supply: Power with 3 VDC
- I2C address 0x60 (7-bit)
- Operating Temperature: -40°C ~ 85°C

Breakout Board details:

- Diameter: 14mm / 0.6"
- Height: 2mm / 0.08"
- Weight: 0.3g

[Datasheets, Fritzing objects, and EagleCAD PCB files available in the tutorial](https://learn.adafruit.com/adafruit-si1145-breakout-board-uv-ir-visible-sensor/downloads)

 ![](https://core-electronics.com.au/attachments/localcontent/rohs_icon_8216055e11.jpg)

## Images

- [Product image 1](https://core-electronics.com.au/media/catalog/product/1/9/1981-02.jpg)