# Adafruit Sensirion SHTC3 - Temperature & Humidity Sensor Breakout

## Overview

![](https://cdn-learn.adafruit.com/assets/assets/000/092/194/medium800/adafruit_products_P4636Front_%281%29_edit.jpg?1592331613)

Sensirion Temperature/Humidity sensors are some of the finest & highest-accuracy devices you can get. And with a true I2C interface, reading the data is for easy. The **SHTC3** sensor has an excellent ±2% relative humidity and ±0.2°C accuracy for most uses.

![](https://cdn-learn.adafruit.com/assets/assets/000/092/195/medium800/adafruit_products_P4636Back_%281%29_edit.jpg?1592331629)

Unlike some earlier SHT sensors, this sensor has a _true_ I2C interface for easy interfacing with only two wires (plus power and ground!). Thanks to the voltage regulator and level shifting circuitry we've included on the breakout It is also is 3V or 5V compliant, so you can power and communicate with it using any microcontroller or microcomputer.

![](https://cdn-learn.adafruit.com/assets/assets/000/092/196/medium800/adafruit_products_P4636FrontHeader_%281%29_edit.jpg?1592331658)

Such a lovely chip - so we spun up a breakout board with the SHTC3 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! 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.

# Adafruit Sensirion SHTC3 - Temperature & Humidity Sensor Breakout

## Pinouts

![](https://cdn-learn.adafruit.com/assets/assets/000/092/197/medium800/adafruit_products_P4636Front_%281%29_edit.jpg?1592331772)

## Power Pins

- **Vin** - this is the power pin. Since the sensor chip uses 3 VDC, we have included a voltage regulator on board that will take 3-5VDC and safely convert it down. To power the board, give it the same power as the logic level of your microcontroller - e.g. for a 5V microcontroller like Arduino, use 5V
- **3Vo** - this is the 3.3V output from the voltage regulator, you can grab up to 100mA from this if you like
- **GND** - common ground for power and logic

## I2C Logic Pins

- **SCL** - this is the I2C clock pin, connect to your microcontroller's I2C clock line.
- **SDA** - this is the I2C data pin, connect to your microcontroller's I2C data line
- **[STEMMA QT](https://learn.adafruit.com/introducing-adafruit-stemma-qt) -** These connectors allow you to connectors to dev boards with  **STEMMA QT** connectors or to other things with [various associated accessories](https://www.adafruit.com/?q=JST%20SH%204)

# Adafruit Sensirion SHTC3 - Temperature & Humidity Sensor Breakout

## Arduino

Using the SHTC3 with Arduino is a simple matter of wiring up the sensor to your Arduino-compatible microcontroller, installing the [Adafruit SHTC3](https://github.com/adafruit/Adafruit_SHTC3) library we've written, and running the provided example code.

# I2C Wiring

Use this wiring if you want to connect via I2C interface. The I2C address for the SHTC3 is **0x70**. 

Here is how to wire up the sensor using one of the [**STEMMA QT**](https://learn.adafruit.com/introducing-adafruit-stemma-qt) connectors. The examples show a Metro but wiring will work the same for an Arduino or other compatible board.

-  Connect **board VIN (red wire)** to  **Arduino**  **5V**  if you are running a **5V** board Arduino (Uno, etc.). If your board is **3V,** connect to that instead.
- Connect **board** **GND (black wire) **to  **Arduino**  **GND**
- Connect **board** **SCL (yellow wire) **to  **Arduino**  **SCL**
- Connect **board** **SDA (blue wire) **to  **Arduino**  **SDA**

![adafruit_products_d_arduino_wiring_a_qt.png](https://cdn-learn.adafruit.com/assets/assets/000/092/225/medium640/adafruit_products_d_arduino_wiring_a_qt.png?1592344226)

Here is how to wire the sensor to a board using a solderless breadboard:

-  Connect **board VIN (red wire)** to  **Arduino**  **5V**  if you are running a **5V** board Arduino (Uno, etc.). If your board is **3V,** connect to that instead.
- Connect **board** **GND (black wire) **to  **Arduino**  **GND**
- Connect **board** **SCL (yellow wire) **to  **Arduino**  **SCL**
- Connect **board** **SDA (blue wire) **to  **Arduino**  **SDA**

![adafruit_products_d_arduino_wiring_bb.png](https://cdn-learn.adafruit.com/assets/assets/000/092/226/medium640/adafruit_products_d_arduino_wiring_bb.png?1592344448)

# Library Installation

You can install the **Adafruit SHTC3 l** ibrary for Arduino using the Library Manager in the Arduino IDE.

![](https://cdn-learn.adafruit.com/assets/assets/000/092/210/medium800/adafruit_products_a_ARDUINO_-_library_manager_menu.png?1592335633)

Click the  **Manage Libraries ...** menu item, search for **Adafruit SHTC3** , and select the  **Adafruit SHTC3**  library:

![](https://cdn-learn.adafruit.com/assets/assets/000/092/211/medium800/adafruit_products_c_arduino_b_libmgr_screenshot.png?1592335775)

Then follow the same process for the  **Adafruit BusIO**  library.

![](https://cdn-learn.adafruit.com/assets/assets/000/092/215/medium800/adafruit_products_aa_ARDUINO-_BusIO_Lib_Manager.png?1592335933)

Finally follow the same process for the  **Adafruit Unified Sensor** library:

![](https://cdn-learn.adafruit.com/assets/assets/000/092/216/medium800/adafruit_products_aaa_ARDUINO_-Unified_Sensor_LibMGR.png?1592336002)

# Load Example

Open up  **File -\> Examples -\> Adafruit SHTC3**  **-\> SHTC3test**

After opening the demo file, upload to your Arduino wired up to the sensor. Once you upload the code, you will see the **Temperature** and **Humidity** values being printed when you open the Serial Monitor ( **Tools-\>Serial Monitor** ) at **115200 baud** , similar to this:

![](https://cdn-learn.adafruit.com/assets/assets/000/092/218/medium800/adafruit_products_c_arduino_example.png?1592336430)

## Example Code
https://github.com/adafruit/Adafruit_SHTC3/blob/master/examples/SHTC3test/SHTC3test.ino

# Adafruit Sensirion SHTC3 - Temperature & Humidity Sensor Breakout

## Arduino Docs

# Adafruit Sensirion SHTC3 - Temperature & Humidity Sensor Breakout

## Python & CircuitPython

It's easy to use the **SHTC3** with Python or CircuitPython, and the [Adafruit CircuitPython SHTC3](https://github.com/adafruit/Adafruit_CircuitPython_SHTC3) module. This module allows you to easily write Python code that reads humidity and temperature from the **SHTC3** sensor.

You can use this sensor 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 a SHTC3 to your board exactly as shown below. Here's an example of wiring a Feather M4 to the sensor with I2C using one of the handy [**STEMMA QT**](https://learn.adafruit.com/introducing-adafruit-stemma-qt) connectors:

- **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_d_cp__a_feather_wiring_a_qt.png](https://cdn-learn.adafruit.com/assets/assets/000/092/227/medium640/adafruit_products_d_cp__a_feather_wiring_a_qt.png?1592345112)

You can also use the standard **0.100" pitch** headers to wire it up on a 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_d_cp_a_feather_wiring_bb.png](https://cdn-learn.adafruit.com/assets/assets/000/092/228/medium640/adafruit_products_d_cp_a_feather_wiring_bb.png?1592345151)

# Python Computer Wiring

Since there's _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 to the sensor using I2C and a [**STEMMA QT**](https://learn.adafruit.com/introducing-adafruit-stemma-qt) connector:

- **Pi 3V**  to **sensor VCC (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_d_rpi_wiring_a_qt.png](https://cdn-learn.adafruit.com/assets/assets/000/092/229/medium640/adafruit_products_d_rpi_wiring_a_qt.png?1592345220)

Finally here is an example of how to wire up a Raspberry Pi to the sensor using a solderless breadboard

- **Pi 3V**  to **sensor VCC (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_d_cp_rpi_wiring_bb.png](https://cdn-learn.adafruit.com/assets/assets/000/092/230/medium640/adafruit_products_d_cp_rpi_wiring_bb.png?1592345302)

## **CircuitPython Installation of SHTC3 Library**

You'll need to install the [Adafruit CircuitPython SHTC3](https://github.com/adafruit/Adafruit_CircuitPython_SHTC3) library on your CircuitPython board.

First make sure you are running the [latest version of Adafruit CircuitPython](https://learn.adafruit.com/welcome-to-circuitpython/installing-circuitpython) for your board.

Next you'll need to install the necessary libraries to use the hardware--carefully follow the steps to find and install these libraries from [Adafruit's CircuitPython library bundle](https://circuitpython.org/libraries).  Our CircuitPython starter guide has [a great page on how to install the library bundle](https://learn.adafruit.com/welcome-to-circuitpython/circuitpython-libraries).

Before continuing make sure your board's **lib** folder or root filesystem has the **adafruit\_shtc3****.mpy **file** and **** adafruit\_bus\_device **folder**  **copied over.

Next [connect to the board's serial REPL ](https://learn.adafruit.com/welcome-to-circuitpython/the-repl)so you are at the CircuitPython `>>>` prompt.

## Python Installation of SHTC3 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:

- `sudo pip3 install adafruit-circuitpython-shtc3`

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 & Python Usage

To demonstrate the usage of the sensor we'll initialize it and read the temperature and humidity measurements from the board's Python REPL.

Danger: 

Run the following code to import the necessary modules and initialize the I2C connection with the sensor:

```python
import board
import adafruit_shtc3

i2c = board.I2C()
sht = adafruit_shtc3.SHTC3(i2c)
```

![](https://cdn-learn.adafruit.com/assets/assets/000/101/997/medium800/adafruit_products_shtc3.png?1620098443)

Now you're ready to read values from the sensor using these properties:

- **relative\_humidity** - The relative humidity measured by the sensor, this is a value from 0-100%.
- **temperature ** - The temperature measured by the sensor, a value in degrees Celsius.

```python
print("Temperature: %0.1f C" % sht.temperature)
print("Humidity: %0.1f %%fH" % sht.relative_humidity)
```

![](https://cdn-learn.adafruit.com/assets/assets/000/092/201/medium800/adafruit_products_d_cp_repl_b_individual_props.png?1592331844)

We've also added a **measurements** property that simultaneously reads the **temperature** and **relative\_humidity** properties and returns them as a `(temperature, relative_humidity)` tuple:

```python
print("Temperature: %0.1f C Humidity: %0.1f %%rH" % sht.measurements)
```

![](https://cdn-learn.adafruit.com/assets/assets/000/092/200/medium800/adafruit_products_d_cp_repl_c_measurements_prop.png?1592331842)

## Example Code
https://github.com/adafruit/Adafruit_CircuitPython_SHTC3/blob/main/examples/shtc3_simpletest.py

# Adafruit Sensirion SHTC3 - Temperature & Humidity Sensor Breakout

## Python Docs

# Adafruit Sensirion SHTC3 - Temperature & Humidity Sensor Breakout

## WipperSnapper

![](https://cdn-learn.adafruit.com/assets/assets/000/128/335/medium800/adafruit_products_01_DeviceList.png?1709232467)

## 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 SHTC3 to your board exactly as follows. Here is an example of the SHTC3 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_featherV2_SHTC3_STEMMAQT_bb.png](https://cdn-learn.adafruit.com/assets/assets/000/128/336/medium640/adafruit_products_featherV2_SHTC3_STEMMAQT_bb.png?1709232665)

![adafruit_products_featherV2_SHTC3_Breadboard_bb.png](https://cdn-learn.adafruit.com/assets/assets/000/128/337/medium640/adafruit_products_featherV2_SHTC3_Breadboard_bb.png?1709232685)

## 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/000/128/340/medium800/adafruit_products_02_DeviceSelection_croppped.png?1709232775)

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 exclamation mark "!" -**  [update to the latest WipperSnapper firmware](https://learn.adafruit.com/quickstart-adafruit-io-wippersnapper) on your board before continuing.

![adafruit_products_04_LatestVersion.png](https://cdn-learn.adafruit.com/assets/assets/000/128/341/medium640/adafruit_products_04_LatestVersion.png?1709232804)

![adafruit_products_04_UpdateRequired.png](https://cdn-learn.adafruit.com/assets/assets/000/128/342/medium640/adafruit_products_04_UpdateRequired.png?1709232820)

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 SHTC3's default I2C address of `0x70` pop-up in the I2C scan list.

![](https://cdn-learn.adafruit.com/assets/assets/000/128/569/medium800/adafruit_products_Screenshot_2024-03-05_131652.png?1709644980)

###  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 `SHTC3` into the search bar, then select the **SHTC3** component.

![](https://cdn-learn.adafruit.com/assets/assets/000/128/343/medium800/adafruit_products_KyLQ37qXai.png?1709234652)

On the component configuration page, the SHTC3s 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 SHTC3 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/000/128/570/medium800/adafruit_products_78BJjGQqjf.png?1709645021)

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/000/128/571/medium800/adafruit_products_yGHt11VyB4.png?1709645038)

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/000/128/572/medium800/adafruit_products_vr1vf1KAoV.png?1709645051)

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/000/128/605/medium800/adafruit_products_yqcLgdEd6B.png?1709733288)

# Adafruit Sensirion SHTC3 - Temperature & Humidity Sensor Breakout

## Downloads

## Files

- [SHTC3 Datasheet](https://sensirion.com/media/documents/643F9C8E/63A5A436/Datasheet_SHTC3.pdf)
- [EagleCAD files on GitHub](https://github.com/adafruit/Adafruit-SHTC3-PCB)
- [3D models on GitHub](https://github.com/adafruit/Adafruit_CAD_Parts/tree/main/4636%20SHTC3)
- [Fritzing object in the Adafruit Fritzing Library](https://github.com/adafruit/Fritzing-Library/blob/master/parts/Adafruit%20SHTC3%20STEMMA%20QT.fzpz)

## Schematic
![](https://cdn-learn.adafruit.com/assets/assets/000/092/202/medium800/adafruit_products_x_downloads_a_schematic.png?1592331863)

## Fab Print
![](https://cdn-learn.adafruit.com/assets/assets/000/092/203/medium800/adafruit_products_x_downloads_b_fab_print.png?1592331870)

![](https://cdn-learn.adafruit.com/assets/assets/000/116/727/medium800thumb/adafruit_products_SHTC3.jpg?1668625664)


## Primary Products

### Adafruit Sensirion SHTC3 Temperature & Humidity Sensor

[Adafruit Sensirion SHTC3 Temperature & Humidity Sensor](https://www.adafruit.com/product/4636)
Sensirion Temperature/Humidity sensors are some of the finest & highest-accuracy devices you can get. And finally, we have some that have a true I2C interface for easy reading. The  **SHTC3**  sensor has an excellent ±2% relative humidity and ±0.2...

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## Related Guides

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- [No-Solder Visualizer Capacitive Touch Controller](https://learn.adafruit.com/no-solder-visualizer-capacitive-touch-controller.md)
- [reef-pi Guide 2: Power Controller](https://learn.adafruit.com/reef-pi-power-controller.md)
- [Adafruit BH1750 Ambient Light Sensor](https://learn.adafruit.com/adafruit-bh1750-ambient-light-sensor.md)