> **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 # Adafruit HDC3022 Precision Temperature & Humidity Sensor - STEMMA QT / Qwiic **Type:** Product page · **SKU:** ADA5989 · **Brand:** [Adafruit](https://core-electronics.com.au/brands/adafruit-australia) **Page:** https://core-electronics.com.au/adafruit-hdc3021-precision-temperature-humidity-sensor-stemma-qt-qwiic.html ([markdown](https://core-electronics.com.au/adafruit-hdc3021-precision-temperature-humidity-sensor-stemma-qt-qwiic.html.md)) This breakout features the highest accuracy & precision that we have see so far! It has the [TI HDC302x series chip](https://www.ti.com/product/HDC3020) with typical 0.5% accuracy for the RH sensor (with 0.19% long-term drift) and ±0.1°C typical accuracy for the temperature sensor. All at a very nice price. ## Pricing - **Price:** $15.60 (inc GST) — $14.18 AUD, exc GST - **Quantity discounts:** 10+ $13.75 (exc GST) · 50+ $13.47 (exc GST) ## Availability & dispatch - Out of stock — the product page offers email notification when it returns. ## How to buy - **Build a cart:** compose `https://core-electronics.com.au/cart/link?items=ADA5989:1` (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/ADA5989:1.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 **Adafruit HDC3022 Precision Temperature & Humidity Sensor** breakout features the highest accuracy & precision that we have see so far! It has the [TI HDC302x series chip](https://www.ti.com/product/HDC3020) with typical 0.5% accuracy for the RH sensor (with 0.19% long-term drift) and ±0.1°C typical accuracy for the temperature sensor. All at a very nice price. This sensor has a true I2C interface for easy interfacing with only two wires (plus power and ground!). That makes it preferable to the janky DHT11/DHT22 sensors. The sensor is 5V safe, so you can use 1.8V to 5V power and logic levels without the need for shifters, so you can power and communicate with it using any microcontroller or microcomputer. With 4 selectable I2C addresses, you can have multiple sensors on one bus - unlike many other fixed-address T/RH sensors. Adafruit have written a [full-featured Arduino](https://github.com/adafruit/Adafruit_HDC302x) and [CircuitPython/Python library](https://github.com/adafruit/Adafruit_CircuitPython_HDC302x), so whether you have an 8-bit microcontroller or a quad-core Raspberry Pi, you will be able to quickly get data from the sensor for your environmental monitoring needs. The library can setup the sensor rate/power, heater, alerts, offsets, and read data or NIST tracking ID. Such a lovely chip - so they spun up a breakout board with the HDC3022 and some supporting circuitry such as pullup resistors and capacitors. To make things even easier, Adafruit have included[ 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! [QT Cable is not included, but Adafruit have a variety in the shop](https://core-electronics.com.au/search?q=stemma+qt+cable). If you prefer working on a breadboard, 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. **Please note: this sensor comes with a protective polyamide sticker on top, please remove before usage!** ## Technical Details **HDC302x specifications:** - Relative humidity (RH) sensor:– Operating range: 0% to 100%– Accuracy: ±0.5% typical– Offset Error Correction: reduces offset to return device to within accuracy specification– Long-term drift: 0.19%RH/yr– Condensation protection with integrated heater - Temperature sensor:– Operating range: –40°C to 125°C– Accuracy: ±0.1°C typical - NIST traceability: relative humidity & temperature - Low power: average current 0.4 µA (sensor only, not including on-board green LED which can be disabled) - I2C interface compatibility up to 1-MHz speeds– Four selectable I2C addresses– Data protection through CRC checksum - Supply voltage: 1.62 V to 5.50 V - Available auto measurement mode - Programmable interrupts - Programmable RH and Temp measurement offset Product Dimensions: 25.4mm x 17.7mm x 4.7mm / 1.0" x 0.7" x 0.2" Product Weight: 1.6g / 0.1oz ## Images - [Product image 1](https://core-electronics.com.au/media/catalog/product/A/D/ADA5989-1.jpg)