# Adafruit HDC302x Precision Temperature & Humidity Sensor

## Overview

Warning: As of September 23, 2024 – We've upgraded this sensor to now be the "HDC3022" rather than the "HDC3021". It is completely the same other than it now has a white PTFE filter cover that should not be removed and will keep your sensor nice and clean.

![](https://cdn-learn.adafruit.com/assets/assets/000/132/859/medium800/adafruit_products_5989-11.jpg?1727879886)

Adafruit stocks a large number of Temperature/Humidity sensors, so you're probably wondering why another one? Well, this **Adafruit HDC3021 Precision Temperature & Humidity Sensor** breakout features the highest accuracy & precision one we've see so far!

It uses 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.

![](https://cdn-learn.adafruit.com/assets/assets/000/131/157/medium800/adafruit_products_5989-02.jpg?1720641392)

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.

![](https://cdn-learn.adafruit.com/assets/assets/000/131/158/medium800/adafruit_products_5989-03.jpg?1720641430)

We've written [full-featured Arduino](https://github.com/adafruit/Adafruit_HDC302x) and [CircuitPython / Python libraries](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 libraries can setup the sensor rate/power, heater, alerts, offsets, and read data or NIST tracking ID.

![](https://cdn-learn.adafruit.com/assets/assets/000/131/159/medium800/adafruit_products_5989-01.jpg?1720641470)

Such a lovely chip - so we spun up a breakout board with the HDC3021 and some supporting circuitry such as pullup resistors and capacitors. To make things even easier, we've included [SparkFun Qwiic](https://www.sparkfun.com/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 we have a variety in the shop](https://www.adafruit.com/?q=stemma+qt+cable&sort=BestMatch).

![](https://cdn-learn.adafruit.com/assets/assets/000/131/160/medium800/adafruit_products_5989-00.jpg?1720641530)

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!**

# Adafruit HDC302x Precision Temperature & Humidity Sensor

## Pinouts

![](https://cdn-learn.adafruit.com/assets/assets/000/131/161/medium800/adafruit_products_double.jpg?1720641757)

The default I2C address is **0x44**.

Warning: As of September 23, 2024 – We've upgraded this sensor to now be the "HDC3022" rather than the "HDC3021". It is completely the same other than it now has a white PTFE filter cover that should not be removed and will keep your sensor nice and clean.

## Power Pins

- **VIN**  - this is the power pin. To power the board, give it the same power as the logic level of your microcontroller - e.g. for a 5V micro like Arduino, use 5V.
- **GND** - common ground for power and logic.

## I2C Logic Pins

- **SCL** - I2C clock pin, connect to your microcontroller's I2C clock line. This pin can use 3-5V logic, and there's a **10K pullup** on this pin.
- **SDA** - I2C data pin, connect to your microcontroller's I2C data line. This pin can use 3-5V logic, and there's a **10K pullup** on this pin.
- **[STEMMA QT](https://learn.adafruit.com/introducing-adafruit-stemma-qt) -** These connectors allow you to connect to dev boards with **STEMMA QT** (Qwiic) connectors or to other things with [various associated accessories](https://www.adafruit.com/?q=JST%20SH%204).

## Other Pins

- **RST** - This is the reset pin. If this pin is pulled low, it will reset the sensor.
- **ALERT** - This is the interrupt pin. It is a push-pull output, meaning that you can monitor the state of this pin for interrupts that can be configured over I2C.

## I2C Address Jumpers

On the back of the board are  **two address jumpers** , labeled **A0** and **A1**** ,** between the STEMMA QT logo and cutouts for the HDC3021 sensor. These jumpers allow you to chain up to 4 of these boards on the same pair of I2C clock and data pins. To do so, you solder the jumpers "closed" by connecting the two pads.

The default I2C address is **0x44**. The other address options can be calculated by “adding” the **A0/A1**  to the base of **0x44**.

**A0** sets the lowest bit with a value of **1** and  **A1** sets the next bit with a value of **2**. ** ** The final address is **0x44 + A1 + A0** which would be **0x47**.

If only  **A0** is soldered closed, the address is **0x44 + 1 = 0x45**

If only  **A1** is soldered closed, the address is **0x44 + 2 = 0x46**

The table below shows all possible addresses, and whether the pin(s) should be high (closed) or low (open).

![](https://cdn-learn.adafruit.com/assets/assets/000/131/162/medium800/adafruit_products_addr.png?1720641860)

## Power LED and Jumper

- **Power LED -** In the upper left corner, above the STEMMA connector, on the front of the board, is the power LED, labeled **on**. It is a green LED.
- **LED jumper ** - This jumper is located on the back of the board and is labeled **LED** on the board silk. Cut the trace on this jumper to cut power to the " **on**" LED.

# Adafruit HDC302x Precision Temperature & Humidity Sensor

## CircuitPython and Python

It's easy to use the **HDC3021** with Python or CircuitPython, and the [Adafruit\_CircuitPython\_HDC302x](https://github.com/adafruit/Adafruit_CircuitPython_HDC302x) module. This module allows you to easily write Python code to read temperature and humidity data from the sensor.

You can use this driver with any CircuitPython microcontroller board or with a computer that has GPIO and Python [thanks to Adafruit\_Blinka, our CircuitPython-for-Python compatibility library](https://learn.adafruit.com/circuitpython-on-raspberrypi-linux).

## CircuitPython Microcontroller Wiring

First wire up the sensor to your board exactly as follows. The following is the sensor wired to a Feather RP2040 using the STEMMA connector:

- **Board STEMMA 3V** to **sensor** **VIN (red wire)**  
- **Board STEMMA GND** to **sensor**  **GND (black wire)**  
- **Board STEMMA SCL** to **sensor**  **SCL (yellow wire)**  
- **Board STEMMA SDA** to **sensor**  **SDA (blue wire)**

![adafruit_products_featherStemma_bb.jpg](https://cdn-learn.adafruit.com/assets/assets/000/131/241/medium640/adafruit_products_featherStemma_bb.jpg?1721052490)

The following is the sensor wired to a Feather RP2040 using a solderless breadboard:

- **Board 3V** to **sensor** **VIN (red wire)**  
- **Board GND** to **sensor**  **GND (black wire)**  
- **Board SCL** to **sensor**  **SCL (yellow wire)**  
- **Board SDA** to **sensor**  **SDA (blue wire)**

![adafruit_products_featherBB_bb.jpg](https://cdn-learn.adafruit.com/assets/assets/000/131/242/medium640/adafruit_products_featherBB_bb.jpg?1721052503)

## Python Computer Wiring

Since there are _dozens_ of Linux computers/boards you can use, we will show wiring for Raspberry Pi. For other platforms, [please visit the guide for CircuitPython on Linux to see whether your platform is supported](https://learn.adafruit.com/circuitpython-on-raspberrypi-linux).

Here's the Raspberry Pi wired with I2C using the STEMMA connector:

- **Pi 3V** to **sensor** **VIN (red wire)**  
- **Pi GND** to **sensor**  **GND (black wire)**  
- **Pi SCL** to **sensor**  **SCL (yellow wire)**  
- **Pi SDA** to **sensor**  **SDA (blue wire)**

![adafruit_products_piStemma_bb.jpg](https://cdn-learn.adafruit.com/assets/assets/000/131/243/medium640/adafruit_products_piStemma_bb.jpg?1721052564)

Here's the Raspberry Pi wired with I2C using a solderless breadboard:

- **Pi 3V** to **sensor** **VIN (red wire)**  
- **Pi GND** to **sensor**  **GND (black wire)**  
- **Pi SCL** to **sensor**  **SCL (yellow wire)**  
- **Pi SDA** to **sensor**  **SDA (blue wire)**

![adafruit_products_piBreadboard_bb.jpg](https://cdn-learn.adafruit.com/assets/assets/000/131/244/medium640/adafruit_products_piBreadboard_bb.jpg?1721052608)

## Python Installation of HDC302x Library

You'll need to install the **Adafruit\_Blinka** library that provides the CircuitPython support in Python. This may also require enabling I2C on your platform and verifying you are running Python 3. [Since each platform is a little different, and Linux changes often, please visit the CircuitPython on Linux guide to get your computer ready](https://learn.adafruit.com/circuitpython-on-raspberrypi-linux)!

Once that's done, from your command line run the following command:

- `pip3 install adafruit-circuitpython-hdc302x`

If your default Python is version 3 you may need to run 'pip' instead. Just make sure you aren't trying to use CircuitPython on Python 2.x, it isn't supported!

## CircuitPython Usage

To use with CircuitPython, you need to first install the **Adafruit\_CircuitPython\_HDC302x** library, and its dependencies, into the **lib** folder on your **CIRCUITPY** drive. Then you need to update **code.py** with the example script.

Thankfully, we can do this in one go. In the example below, click the **Download Project Bundle** button below to download the necessary libraries and the **code.py** file in a zip file. Extract the contents of the zip file, and copy the **entire**  **lib**  **folder** and the **code.py** file to your **CIRCUITPY** drive.

Your **CIRCUITPY/lib** folder should contain the following folder and file:

- **adafruit\_bus\_device/**
- **adafruit\_hdc302x.mpy**

![CIRCUITPY](https://adafruit.github.io/Adafruit_CircuitPython_Bundle/hdc302x_hdc302x_simpletest.py.png )

## Python Usage

Once you have the library `pip3` installed on your computer, copy or download the following example to your computer, and run the following, replacing **code.py** with whatever you named the file:

`python3 code.py`

## Example Code

**If running CircuitPython:** Once everything is saved to the **CIRCUITPY** drive, [connect to the serial console](https://learn.adafruit.com/welcome-to-circuitpython/kattni-connecting-to-the-serial-console) to see the data printed out!

**If running Python:** The console output will appear wherever you are running Python.

https://github.com/adafruit/Adafruit_CircuitPython_HDC302x/blob/main/examples/hdc302x_simpletest.py

The HDC3021 is instantiated over I2C. Then in the loop, the temperature and humidity readings are printed to the serial monitor every two seconds.

![](https://cdn-learn.adafruit.com/assets/assets/000/131/245/medium800/adafruit_products_cp_serial.png?1721053068)

# Adafruit HDC302x Precision Temperature & Humidity Sensor

## Python Docs

# Adafruit HDC302x Precision Temperature & Humidity Sensor

## Arduino

Using the HDC3021 breakout with Arduino involves wiring up the breakout to your Arduino-compatible microcontroller, installing the [Adafruit\_HDC302x](https://github.com/adafruit/Adafruit_HDC302x) library, and running the provided example code.

## Wiring

Wire as shown for a **5V** board like an Uno. If you are using a **3V** board, like an Adafruit Feather, wire the board's 3V pin to the breakout VIN.

Here is an Adafruit Metro wired up to the sensor using the STEMMA QT connector.

- **Board 5V** to **sensor** **VIN (red wire)**  
- **Board GND** to **sensor**  **GND (black wire)**  
- **Board SCL** to **sensor**  **SCL (yellow wire)**  
- **Board SDA** to **sensor**  **SDA (blue wire)**

![adafruit_products_metro_stemma_bb.jpg](https://cdn-learn.adafruit.com/assets/assets/000/131/246/medium640/adafruit_products_metro_stemma_bb.jpg?1721053338)

Here is an Adafruit Metro wired up using a solderless breadboard:

- **Board 5V** to **sensor** **VIN (red wire)**  
- **Board GND** to **sensor**  **GND (black wire)**  
- **Board SCL** to **sensor**  **SCL (yellow wire)**  
- **Board SDA** to **sensor**  **SDA (blue wire)**

![adafruit_products_metro_bb_bb.jpg](https://cdn-learn.adafruit.com/assets/assets/000/131/247/medium640/adafruit_products_metro_bb_bb.jpg?1721053364)

## Library Installation

You can install the **Adafruit\_HDC302x** library for Arduino using the Library Manager in the Arduino IDE.

![](https://cdn-learn.adafruit.com/assets/assets/000/131/248/medium800/adafruit_products_Arduino_Open_Library_Manager.png?1721053398)

Click the **Manage Libraries ...** menu item, search for **Adafruit\_HDC302x** , and select the **Adafruit HDC302x** library:

![](https://cdn-learn.adafruit.com/assets/assets/000/131/249/medium800/adafruit_products_lib.png?1721054131)

If asked about dependencies, click "Install all".

![](https://cdn-learn.adafruit.com/assets/assets/000/131/250/medium800/adafruit_products_depends.png?1721054144)

If the "Dependencies" window does not come up, then you already have the dependencies installed.

Warning: If the dependencies are already installed, make sure you update them through the Arduino Library Manager before loading the example!

## Example Code
https://github.com/adafruit/Adafruit_HDC302x/blob/main/examples/HDC302x_basicTempHumidity/HDC302x_basicTempHumidity.ino

Upload the sketch to your board and open up the Serial Monitor ( **Tools -\> Serial Monitor** ) at 115200 baud. After the HDC3021 is recognized over I2C, you'll see the temperature and humidity readings print to the Serial Monitor every two seconds.

![](https://cdn-learn.adafruit.com/assets/assets/000/131/251/medium800/adafruit_products_arduinoSerial.png?1721054209)

# Adafruit HDC302x Precision Temperature & Humidity Sensor

## Arduino Docs

# Adafruit HDC302x Precision Temperature & Humidity Sensor

## WipperSnapper

![](https://cdn-learn.adafruit.com/assets/assets/000/132/832/medium800/adafruit_products_01_DeviceList.png?1727821974)

## What is WipperSnapper

WipperSnapper is a firmware designed to turn any WiFi-capable board into an Internet-of-Things device without programming a single line of code. WipperSnapper connects to [Adafruit IO](https://io.adafruit.com/), a web platform designed ([by Adafruit!](https://www.adafruit.com/about)) to _display_, _respond_, and _interact_ with your project's data.

Simply load the WipperSnapper firmware onto your board, add credentials, and plug it into power. Your board will automatically register itself with your Adafruit IO account.

From there, you can add _components_ to your board such as buttons, switches, potentiometers, sensors, and more! Components are _dynamically _added to hardware, so you can immediately start interacting, logging, and streaming the data your projects produce without writing code.

If you've never used WipperSnapper, click below to read through the quick start guide before continuing.

[Quickstart: Adafruit IO WipperSnapper](https://learn.adafruit.com/quickstart-adafruit-io-wippersnapper)
## Wiring
First, wire up an HDC302x (HDC3021/HDC3022) to your board exactly as follows. Here is an example of the HDC3021 wired to an [Adafruit ESP32 Feather V2](https://www.adafruit.com/product/5400) using I2C [with a STEMMA QT cable (no soldering required)](https://www.adafruit.com/product/4210)

- **Board 3V**  to **sensor VIN (red wire on STEMMA QT)**  
- **Board GND**  to **sensor GND (black wire on STEMMA QT)**  
- **Board SCL**  to **sensor SCL (yellow wire on STEMMA QT)**  
- **Board SDA**  to **sensor SDA (blue wire on STEMMA QT)**

![adafruit_products_featherStemma_HDC302x_bb.png](https://cdn-learn.adafruit.com/assets/assets/000/132/814/medium640/adafruit_products_featherStemma_HDC302x_bb.png?1727813354)

![adafruit_products_featherBB_HDC302x_bb.png](https://cdn-learn.adafruit.com/assets/assets/000/132/816/medium640/adafruit_products_featherBB_HDC302x_bb.png?1727813374)

## Usage

Connect your board to Adafruit IO Wippersnapper and **[navigate to the WipperSnapper board list](https://io.adafruit.com/wippersnapper).**

On this page, **select the WipperSnapper board you're using** to be brought to the board's interface page.

![](https://cdn-learn.adafruit.com/assets/assets/000/132/834/medium800/adafruit_products_02_DeviceSelection.png?1727822199)

If you do not see your board listed here - you need [to connect your board to Adafruit IO](https://learn.adafruit.com/quickstart-adafruit-io-wippersnapper) first.

On the device page, quickly  **check that you're running the latest version of the WipperSnapper firmware**.

The device tile on the left indicates the version number of the firmware running on the connected board.

- **If the firmware version is green with a checkmark -**  continue with this guide.
- **If the firmware version is red with an "X" -**  [update to the latest WipperSnapper firmware](https://learn.adafruit.com/quickstart-adafruit-io-wippersnapper) on your board before continuing.

![adafruit_products_04_UpdateRequired.png](https://cdn-learn.adafruit.com/assets/assets/000/132/835/medium640/adafruit_products_04_UpdateRequired.png?1727822273)

![adafruit_products_04_LatestVersion.png](https://cdn-learn.adafruit.com/assets/assets/000/132/836/medium640/adafruit_products_04_LatestVersion.png?1727822288)

Next, make sure the sensor is plugged into your board and click the ** I2C Scan ** button.

![](https://cdn-learn.adafruit.com/assets/assets/000/113/177/medium800/sensor_page_crop_scan.png?1657724520)

 You should see the HDC302x's default I2C address of `0x44` pop-up in the I2C scan list.

![](https://cdn-learn.adafruit.com/assets/assets/000/132/838/medium800/adafruit_products_I2C_0x44.png?1727822573)

###  I don't see the sensor's I2C address listed! 


First, double-check the connection and/or wiring between the sensor and the board.

Then, reset the board and let it re-connect to Adafruit IO WipperSnapper.

With the sensor detected in an I2C scan, you're ready to add the sensor to your board.

**Click the New Component button or the + button** to bring up the component picker.

![](https://cdn-learn.adafruit.com/assets/assets/000/127/931/medium800/sensor_page_temperature___humidity_06_AddComponent.png?1708631009)

Adafruit IO supports a large amount of components. To quickly find your sensor, type `HDC302` into the search bar, then select the  **HDC302x** component.

![](https://cdn-learn.adafruit.com/assets/assets/000/132/839/medium800/adafruit_products_Arrows_HDC302x_QwmIuEDFqV.png?1727823886)

On the component configuration page, the HDC302x's sensor address should be listed along with the sensor's settings.

The  **Send Every**  option is specific to each sensor's measurements. This option will tell the Feather how often it should read from the HDC302x sensor and send the data to Adafruit IO. Measurements can range from every 30 seconds to every 24 hours.

For this example, set the  **Send Every ** interval to every 30 seconds.

![](https://cdn-learn.adafruit.com/assets/assets/000/132/843/medium800/adafruit_products_VxauT3tOeP.png?1727826523)

Your device interface should now show the sensor components you created. After the interval you configured elapses, WipperSnapper will automatically read values from the sensor(s) and send them to Adafruit IO.

![](https://cdn-learn.adafruit.com/assets/assets/000/132/841/medium800/adafruit_products_te6rRv8efp.png?1727826409)

To view the data that has been logged from the sensor, click on the graph next to the sensor name.

![](https://cdn-learn.adafruit.com/assets/assets/000/132/840/medium800/adafruit_products_4oOBRrBm46.png?1727826396)

Here you can see the feed history and edit things about the feed such as the name, privacy, webhooks associated with the feed and more. If you want to learn more about how feeds work, [check out this page](https://learn.adafruit.com/all-the-internet-of-things-episode-four-adafruit-io/advanced-feeds).

![](https://cdn-learn.adafruit.com/assets/assets/000/132/858/medium800/adafruit_products_KNXDmjDBs5.png?1727878250)

# Adafruit HDC302x Precision Temperature & Humidity Sensor

## Downloads

## Files

- [HDC3021 Datasheet](https://cdn-learn.adafruit.com/assets/assets/000/131/097/original/hdc3021-q1.pdf?1720448563)
- [EagleCAD PCB Files on GitHub](https://github.com/adafruit/Adafruit-HDC3021-Precision-Temperature-Humidity-Sensor-PCB)
- [Fritzing object in the Adafruit Fritzing Library](https://github.com/adafruit/Fritzing-Library/blob/master/parts/Adafruit%20HDC3021%20Precision%20Temperature%20Humidity%20Sensor.fzpz)

## Schematic and Fab Print
![](https://cdn-learn.adafruit.com/assets/assets/000/131/098/medium800/adafruit_products_schem.png?1720448712)

![](https://cdn-learn.adafruit.com/assets/assets/000/131/099/medium800/adafruit_products_fab.png?1720448719 dimensions are in inches)


## Primary Products

### Adafruit HDC3022 Precision Temperature & Humidity Sensor

[Adafruit HDC3022 Precision Temperature & Humidity Sensor](https://www.adafruit.com/product/5989)
We stock a large number of Temperature/Humidity sensors, so you're probably wondering why another one? Well, this  **Adafruit HDC3022 Precision Temperature & Humidity Sensor** breakout features the highest accuracy & precision one we've see so far! It has the...

Out of Stock
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This 4-wire cable is a little over 100mm / 4" long and fitted with JST-SH female 4-pin connectors on both ends. Compared with the chunkier JST-PH these are 1mm pitch instead of 2mm, but still have a nice latching feel, while being easy to insert and remove.

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This 4-wire cable is a little over 150mm / 6" long and fitted with JST-SH female 4-pin connectors on one end and premium female headers on the other. Compared with the chunkier JST-PH these are 1mm pitch instead of 2mm, but still have a nice latching feel, while being easy to insert and...

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