SI1145 Digital UV Index / IR / Visible Light Sensor

Rating:
93% of 100
SKU: ADA1777 Brand: Adafruit
Remember when you were a kid and there was a birthday party at the pool and your parents totally embarrassed you by slathering you all over with sunscreen and you...
$19.95 AUD, inc GST
$18.14 AUD, exc GST

Quantity Discounts:

  • 10-25 $17.41 (exc GST)
  • 25+ $16.86 (exc GST)

Out of Stock

Sign up to get notified when it's available to order.

0 from local stock, 1 supplier stock; your order will dispatch between Dec 1 to Dec 10. And yes, stock levels and lead times are accurate!

Favourite product

Shipping:

  • $6+ Standard (5+ days*, tracked)
  • $10+ Express (2+ days*, tracked)
  • FREE Pickup (Newcastle only - must order online*)

Shipping costs may increase for heavy products or large orders.

Exact shipping can be calculated on the view cart page.

*Conditions apply, see shipping tab below.

Remember when you were a kid and there was a birthday party at the pool and your parents totally embarrassed you by slathering you all over with sunscreen and you were all "MOM I HAVE ENOUGH SUNSCREEN" and she wouldn't listen? Well, if you had this UV Index sensor connected up to an Arduino you could have said "According to this calibrated SI1145 sensor from SiLabs, the UV index right now is 4.5 which means I do not need more sunscreen" and she would have been so impressed with your project that you could have spent more time splashing around.

The SI1145 is a new sensor from SiLabs with a calibrated light sensing algorithm that can calculate UV Index. It doesn't contain an actual UV sensing element, instead it approximates it based on visible & IR light from the sun. Adafruit took this outside a couple days and compared the calculated UV index with the news-reported index and found it was very accurate! It's a digital sensor that works over I2C so just about any microcontroller can use it. The sensor also has individual visible and IR sensing elements so you can measure just about any kind of light - Adafruit only wrote Adafruit's library to printout the 'counts' rather than the calculate the exact values of IR and Visible light so if you need precision Lux measurement check out the TSL2561. If you're feeling really advanced, you can connect up an IR LED to the LED pin and use the basic proximity sensor capability that is in the SI1145 as well.

Adafruit wrapped this nice little sensor up on a PCB with level shifting and regulation circuitry so you can safely use it with 3 or 5V microcontrollers. If you are using an Arduino, Adafruit have got a lovely tutorial and library already written up with example code so you can quickly read sensor readings and the UV index in under 10 minutes. Each order comes with one fully assembled and tested PCB breakout and a small piece of header. You'll need to solder the header onto the PCB but it's fairly easy and takes only a few minutes even for a beginner.
 

Technical Details

SI1145 Details:

Breakout Dimensions:

  • 20mm x 18mm x 2mm / 0.8" x 0.7" x 0.08"
  • Weight: 1.4g

This product is listed in:

Sensors>Light & Colour

Product Comments

Exact shipping can be calculated on the view cart page (no login required).

Products that weigh more than 0.5 KG may cost more than what's shown (for example, test equipment, machines, >500mL liquids, etc).

We deliver Australia-wide with these options (depends on the final destination - you can get a quote on the view cart page):

  • $3+ for Stamped Mail (typically 10+ business days, not tracked, only available on selected small items)
  • $6+ for Standard Post (typically 6+ business days, tracked)
  • $10+ for Express Post (typically 2+ business days, tracked)
  • Pickup - Free! Only available to customers who live in the Newcastle region (must order online and only pickup after we email to notify you the order is ready). Orders placed after 2PM may not be ready until the following business day.

Non-metro addresses in WA, NT, SA & TAS can take 2+ days in addition to the above information.

Some batteries (such as LiPo) can't be shipped by Air. During checkout, Express Post and International Methods will not be an option if you have that type of battery in your shopping cart.

International Orders - the following rates are for New Zealand and will vary for other countries:

  • $11+ for Pack and Track (3+ days, tracked)
  • $16+ for Express International (2-5 days, tracked)

If you order lots of gear, the postage amount will increase based on the weight of your order.

Our physical address (here's a PDF which includes other key business details):

Unit 18, 132 Garden Grove Parade
Adamstown
NSW, 2289
Australia

Take a look at our customer service page if you have other questions such as "do we do purchase orders" (yes!) or "are prices GST inclusive" (yes they are!). We're here to help - get in touch with us to talk shop.

Have a product question? We're here to help!

Write Your Own Review

Videos

View All

Guides

Lightning Sensor with a Raspberry Pi Single Board Computer - 40 KM RADIUS RANGE!

What if I told you that you could have the power to detect a lightning strike from 40km away? You'd...
What if I told you that you could have the power to detect a lightning strike from 40km away? You'd...

Micro:bit Light and UV Sensing

Every Micro:bit has the ability to measure visible light, but what about UV light? Imagine that...
Every Micro:bit has the ability to measure visible light, but what about UV light? Imagine that...

Light Sensing with an LDR and Pycom

Note: With the rollout of TTNv3, the "Setup" section of this guide no longer works - but we're keepi...
Note: With the rollout of TTNv3, the "Setup" section of this guide no longer works - but we're keepi...

The Maker Revolution

The Maker Revolution celebrates the creation of new devices and the modification of existing ones - ...
The Maker Revolution celebrates the creation of new devices and the modification of existing ones - ...

Projects

The Curse Of The Mummy! Egyptian-Themed Halloween Puzzle

IntroductionI’ve had this idea for Halloween for a few years now. I wanted to make my porch d...
IntroductionI’ve had this idea for Halloween for a few years now. I wanted to make my porch d...

WhyzaGC - Feather ESP32 addon to the MightyOhm Gieger Counter

This project is about adding a wireless Adafruit Feather HUZZAH ESP8266 or ESP32 v2 with Adafruit F...
This project is about adding a wireless Adafruit Feather HUZZAH ESP8266 or ESP32 v2 with Adafruit F...

Handheld UV Meter

UV is important to reptiles (and people) in processing vitamin D3 which is needed to absorb calcium....
UV is important to reptiles (and people) in processing vitamin D3 which is needed to absorb calcium....
Feedback

Please continue if you would like to leave feedback for any of these topics:

  • Website features/issues
  • Content errors/improvements
  • Missing products/categories
  • Product assignments to categories
  • Search results relevance

For all other inquiries (orders status, stock levels, etc), please contact our support team for quick assistance.

Note: click continue and a draft email will be opened to edit. If you don't have an email client on your device, then send a message via the chat icon on the bottom left of our website.

Makers love reviews as much as you do, please follow this link to review the products you have purchased.