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Full machine-readable index: https://core-electronics.com.au/llms.txt # Adafruit HTS221 - Temperature & Humidity Sensor Breakout Board - STEMMA QT / Qwiic **Type:** Product page · **SKU:** ADA4535 · **Brand:** [Adafruit](https://core-electronics.com.au/brands/adafruit-australia) **Page:** https://core-electronics.com.au/adafruit-hts221-temperature-humidity-sensor-breakout-board-stemma-qt-qwiic.html ([markdown](https://core-electronics.com.au/adafruit-hts221-temperature-humidity-sensor-breakout-board-stemma-qt-qwiic.html.md)) Humidity is the concentration of water vapor (water when it's a gas) in the air. Some places have more and make you feel soggy and hot like you're in a sauna. Other... ## Pricing - **Price:** $17.25 (inc GST) — $15.68 AUD, exc GST - **Quantity discounts:** 10+ $15.21 (exc GST) · 50+ $14.90 (exc GST) ## Availability & dispatch - Available with a lead time — expect dispatch between Sep 08 and Sep 14. ## How to buy - **Build a cart:** compose `https://core-electronics.com.au/cart/link?items=ADA4535:1` (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/ADA4535:1.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 Humidity is the concentration of water vapor (water when it's a gas) in the air. Some places have more and make you feel soggy and hot like you're in a sauna. Other places don't have much, which makes it easier to get nose bleeds and static zaps. These are just a few examples of how humidity can have a noticeable impact on things that grow, like mushrooms or humans, as well as things that are sensitive to moisture, like delicate electronics, or humans. This is where the **HTS221 Temperature and Humidity Sensor** by ST comes in. With an HTS221, you can take measurements of the relative humidity which will tell you if the environment you're measuring is bone dry or sopping wet. The HTS221 can measure relative humidity from **0%-100% rH** with a sensitivity of 0.004% and 3.5% accuracy between 20-80%. It can also measure temperature from **-40 to 120** degrees C, with a resolution of 0.016°C with ±0.5 °C accuracy between 15 and +40 °C. The HTS221 is an inexpensive humidity sensor which makes it great for every day measurement applications. Want to measure the humidity of your bathroom? Sure! How about your mushroom farm? Perfect! The HTS221 lets you choose between a **3-wire SPI** or the ever-popular **I2C** which only needs two wires for data. If you're an I2C fan (who isn't?), Adafruit have included Adafruit's handy dandy [SparkFun Qwiic](https://core-electronics.com.au/catalogsearch/result/?q=qwiic) compatible **[STEMMA QT](https://learn.adafruit.com/introducing-adafruit-stemma-qt)** connectors for the I2C bus **so you don't even need to solder!** Since the HTS221 is a super small 2mm square, Adafruit have put it on a breakout board with level shifting and a power regulator, so it's easy to use on a breadboard with either a **5V logic level** device like a Metro 328 or Arduino Uno, or with **3.3V logic level** devices like a Feather M4 or Raspberry Pi of your choice. Lastly, it wouldn't be an Adafruit breakout if it didn't come with [**libraries for Arduino and CircuitPython or Python**. Adafruit have also written **example code** and instructions on the pages that follow](https://learn.adafruit.com/adafruit-hts221-temperature-humidity-sensor), so you'll be ready to tell all your friends the approximate relative humidity level and temperature in only a few minutes. ## Technical Details - Capacitive digital sensor for relative humidity and temperature - 0to 100% relative humidity range - 3 - 5 VDC power and logic - Selectable ODR from 1 Hz to 12.5 Hz - High rH sensitivity: 0.004% rH/LSB - Humidity accuracy: ± 3.5% rH, 20 to +80% rH - Temperature accuracy: ± 0.5°C,15 to +40 °C - Embedded 16-bit ADC with16-bit humidity and temperature output data - SPI and I²C interfaces, I2C address 0x5F - ST Factory calibrated ![RoHS 2 2011 65 EU Compliant](https://core-electronics.com.au/attachments/localcontent/RoHS2_2011_65_EU_7356c5574c.svg)![RoHS 2 2015 863 EU Compliant](https://core-electronics.com.au/attachments/localcontent/RoHS2_2015_863_EU_86773f57f9.svg) ## Images - [Product image 1](https://core-electronics.com.au/media/catalog/product/4/5/4535-01.jpg)