# Adafruit STHS34PF80 IR Presence / Motion Sensor ## Overview ![](https://cdn-learn.adafruit.com/assets/assets/000/140/297/medium800/adafruit_products_6426-04.jpg?1760029692 ) We stock many low cost ["Passive IR" Presence / Motion sensors](https://www.adafruit.com/search?q=pir+sensor), and they're very popular for detecting motion from humanoids and pets 5 to 20 feet away. (They possibly work on zombies, not guaranteed, depends on how warm they are). The vast majority of PIR sensors use a larger infrared receiver, a processing chip (sometimes integrated into the receiver) and a lens. However, this makes them kinda chunky. Also most have a digital, or maybe analog signal output - which makes them very simple. ![](https://cdn-learn.adafruit.com/assets/assets/000/140/298/medium800/adafruit_products_6426-02.jpg?1760029730 ) The **Adafruit STHS34PF80 IR Presence / Motion Sensor** is like a deluxe version of the classic PIR sensor in that it has an IR sensing element that works up to 4 meters away and doesn't require a lens, which makes it easier to integrate into small enclosures. It also comes with a full I2C interface so you can get detailed information about how much IR was detected, and whether there's presence, movement, or temperature changes. ![](https://cdn-learn.adafruit.com/assets/assets/000/140/299/medium800/adafruit_products_6426-03.jpg?1760029771 ) Nice sensor right? So we made it easy for you to get right into your next project. The surface-mount sensor is soldered onto a PCB and comes with a 3.3V regulator and level shifting so you can use it with a 3V or 5V logic microcontroller or single board computer without worry. ![](https://cdn-learn.adafruit.com/assets/assets/000/140/300/medium800/adafruit_products_6426-01.jpg?1760029793 ) The custom made PCB is in the [**STEMMA QT** form factor](https://www.adafruit.com/?q=stemma%20qt%20sensor), making them easy to interface with. The [STEMMA QT connectors](https://learn.adafruit.com/introducing-adafruit-stemma-qt/what-is-stemma-qt) on either side are compatible with the [SparkFun Qwiic](https://www.sparkfun.com/qwiic) I2C connectors. This allows you to make solderless connections between your development board and the STHS34PF80 or to chain it with a wide range of other sensors and accessories using a [**compatible cable**](https://www.adafruit.com/?q=stemma%20qt%20cable). [QT Cable is not included, but we have a variety in the shop](https://www.adafruit.com/?q=stemma+qt+cable&sort=BestMatch) # Adafruit STHS34PF80 IR Presence / Motion Sensor ## Pinouts ![](https://cdn-learn.adafruit.com/assets/assets/000/140/303/medium800/adafruit_products_double.jpg?1760033931 ) The default I2C address is **0x5A**. ## Power Pins - **VIN**  - this is the power pin. It can be powered by 3V or 5V. Give it the same power as the logic level of your microcontroller - e.g. for a 5V micro 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** - 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 development boards with **STEMMA QT** (Qwiic) connectors or to other things with [various associated accessories](https://www.adafruit.com/?q=JST%20SH%204). ## Interrupt Pin - **INT** - This is the interrupt pin. Its polarity and output type can be set in software over I2C. ## 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 STHS34PF80 IR Presence / Motion Sensor ## CircuitPython and Python It's easy to use the **STHS34PF80 breakout** with Python or CircuitPython, and the [Adafruit\_CircuitPython\_STHS34PF80](https://github.com/adafruit/Adafruit_CircuitPython_STHS34PF80) module. This module allows you to easily write Python code to read ambient and object temperatures with 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 breakout to your board exactly as follows. The following is the sensor wired to a Feather RP2040 using the STEMMA connector: - **Board STEMMA 3V** to **breakout STEMMA **** VIN (red wire)** - **Board STEMMA GND** to **breakout** **STEMMA** **GND (black wire)** - **Board STEMMA SCL** to **breakout** **STEMMA** **SCL (yellow wire)** - **Board STEMMA SDA** to **breakout** **STEMMA** **SDA (blue wire)** ![](https://cdn-learn.adafruit.com/assets/assets/000/140/316/medium640/adafruit_products_feather_stemma_bb.jpg?1760037414) The following is the breakout wired to a Feather RP2040 using a solderless breadboard: - **Board 3V** to **breakout** **VIN (red wire)** - **Board GND** to **breakout**  **GND (black wire)** - **Board SCL** to **breakout**  **SCL (yellow wire)** - **Board SDA** to **breakout**  **SDA (blue wire)** ![](https://cdn-learn.adafruit.com/assets/assets/000/140/317/medium640/adafruit_products_feather_bb_bb.jpg?1760037462) ## 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 **breakout STEMMA** **VIN (red wire)** - **Pi GND** to **breakout** **STEMMA** **GND (black wire)** - **Pi SCL** to **breakout** **STEMMA** **SCL (yellow wire)** - **Pi SDA** to **breakout** **STEMMA** **SDA (blue wire)** ![](https://cdn-learn.adafruit.com/assets/assets/000/140/318/medium640/adafruit_products_piStemma_bb.jpg?1760037491) Here's the Raspberry Pi wired with I2C using a solderless breadboard: - **Pi 3V** to **breakout** **VIN (red wire)** - **Pi GND** to **breakout**  **GND (black wire)** - **Pi SCL** to **breakout**  **SCL (yellow wire)** - **Pi SDA** to **breakout**  **SDA (blue wire)** ![](https://cdn-learn.adafruit.com/assets/assets/000/140/319/medium640/adafruit_products_piBB_bb.jpg?1760037516) ## Python Installation of STHS34PF80 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-sths34pf80` 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\_STHS34PF80**  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 folders and file: - **adafruit\_bus\_device/** - **adafruit\_register/** - **adafruit\_sths34pf80.mpy** ![CIRCUITPY drive](https://adafruit.github.io/Adafruit_CircuitPython_Bundle/sths34pf80_sths34pf80_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_STHS34PF80/blob/main/examples/sths34pf80_simpletest.py First, the STHS34PF80 sensor is recognized over I2C. Then, in the loop, it prints out the ambient temperature, presence detection and motion detection data. ![](https://cdn-learn.adafruit.com/assets/assets/000/140/522/medium800/adafruit_products_Screenshot_2025-10-16_092255.png?1760620982 ) # Adafruit STHS34PF80 IR Presence / Motion Sensor ## Python Docs # Adafruit STHS34PF80 IR Presence / Motion Sensor ## Arduino Using the STHS34PF80 breakout with Arduino involves wiring up the breakout to your Arduino-compatible microcontroller, installing the [Adafruit\_STHS34PF80](https://github.com/adafruit/Adafruit_STHS34PF80) 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 sensor VIN. Here is an Adafruit Metro wired up to the sensor using the STEMMA QT connector: - **Board 5V** to **breakout** **VIN (red wire)** - **Board GND** to **breakout**  **GND (black wire)** - **Board SCL** to **breakout**  **SCL (yellow wire)** - **Board SDA** to **breakout**  **SDA (blue wire)** ![](https://cdn-learn.adafruit.com/assets/assets/000/140/308/medium640/adafruit_products_metroSTEMMA_bb.jpg?1760037288) Here is an Adafruit Metro wired up using a solderless breadboard: - **Board 5V** to **breakout** **VIN (red wire)** - **Board GND** to **breakout**  **GND (black wire)** - **Board SCL** to **breakout**  **SCL (yellow wire)** - **Board SDA** to **breakout**  **SDA (blue wire)** ![](https://cdn-learn.adafruit.com/assets/assets/000/140/309/medium640/adafruit_products_metroBB_bb.jpg?1760037308) ## Library Installation You can install the **Adafruit\_STHS34PF80**  library for Arduino using the Library Manager in the Arduino IDE. ![](https://cdn-learn.adafruit.com/assets/assets/000/140/304/medium800/adafruit_products_Arduino_Open_Library_Manager.png?1760034780 ) Click the **Manage Libraries ...** menu item, search for **Adafruit STHS34PF80** , and select the **Adafruit STHS34PF80**  library: ![](https://cdn-learn.adafruit.com/assets/assets/000/140/305/medium800/adafruit_products_Screenshot_2025-10-09_143720.png?1760035068 ) If asked about dependencies, click "Install all". ![](https://cdn-learn.adafruit.com/assets/assets/000/140/306/medium800/adafruit_products_Screenshot_2025-10-09_143731.png?1760035075 ) If the "Dependencies" window does not come up, then you already have the dependencies installed. Warning: If the dependencies are already installed, you must make sure you update them through the Arduino Library Manager before loading the example! ## Example Code https://github.com/adafruit/Adafruit_STHS34PF80/blob/main/examples/sths34pf80_simple/sths34pf80_simple.ino Upload the sketch to your board and open up the Serial Monitor ( **Tools -\> Serial Monitor** ) at 115200 baud. You'll see the STHS34PF80 recognized over I2C. Then, the ambient temperature, presence detection and motion detection are printed to the Serial Monitor. ![](https://cdn-learn.adafruit.com/assets/assets/000/140/493/medium800/adafruit_products_Screenshot_2025-10-15_111946.png?1760541608 ) # Adafruit STHS34PF80 IR Presence / Motion Sensor ## Arduino Docs # Adafruit STHS34PF80 IR Presence / Motion Sensor ## Downloads ## Files - [STHS34PF80 Datasheet](https://cdn-shop.adafruit.com/product-files/6426/sths34pf80.pdf) - [EagleCAD PCB files on GitHub](https://github.com/adafruit/Adafruit-STHS34PF80-IR-Presence-Sensor-PCB) - [3D models on GitHub](https://github.com/adafruit/Adafruit_CAD_Parts/tree/main/6426%20STHS34PF80%20IR%20Presence%20Sensor) - [Fritzing object in the Adafruit Fritzing Library](https://github.com/adafruit/Fritzing-Library/blob/master/parts/Adafruit%20STHS34PF80%20IR%20Presence%20Motion%20Sensor.fzpz) ## Schematic and Fab Print ![](https://cdn-learn.adafruit.com/assets/assets/000/140/301/medium800/adafruit_products_schem.png?1760030142 ) ![](https://cdn-learn.adafruit.com/assets/assets/000/140/302/medium800/adafruit_products_fab.png?1760030153 dimensions are in inches) ![](https://cdn-learn.adafruit.com/assets/assets/000/140/386/medium800/adafruit_products_6426_STHS34PF80_IR_Presence_Sensor.jpg?1760371515 ) ## Primary Products ### Adafruit STHS34PF80 IR Presence / Motion Sensor [Adafruit STHS34PF80 IR Presence / Motion Sensor](https://www.adafruit.com/product/6426) We stock many low cost ["Passive IR" Presence / Motion sensors](https://www.adafruit.com/search?q=pir+sensor), and they're very popular for detecting motion from humanoids and pets 5 to 20 feet away.  (They possibly work on zombies, not guaranteed,... 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