Adafruit
Adafruit STHS34PF80 IR Presence / Motion Sensor
· MPN: ADA6426
The Adafruit STHS34PF80 is a compact IR presence and motion sensor that detects human and animal presence up to 4 metres away — without requiring a lens. Unl...
The Adafruit STHS34PF80 is a compact IR presence and motion sensor that detects human and animal presence up to 4 metres away — without requiring a lens. Unlike traditional chunky PIR sensors with simple digital output, this sensor provides a full I2C interface with detailed readings on IR intensity, presence detection, movement, and temperature changes.
The surface-mount sensor comes on a STEMMA QT breakout with a 3.3V regulator and level shifting, making it compatible with both 3.3V and 5V logic. STEMMA QT / Qwiic connectors on each side enable solderless I2C daisy-chaining.
Key Features
- STHS34PF80 IR Sensor – Detects presence, motion, and temperature changes
- Up to 4 m Range – No lens required, easy to fit in small enclosures
- I2C Interface – Detailed IR readings beyond simple on/off detection
- STEMMA QT / Qwiic – Solderless I2C connectors for easy daisy-chaining
- 3.3V Regulator + Level Shifting – Compatible with 3V and 5V logic
- Compact Form Factor – Much smaller than traditional PIR sensors
Ideal For
- Room occupancy and presence detection
- Motion-activated lighting and displays
- Smart home automation
- Compact security and monitoring systems
Package Contents
- 1× STHS34PF80 breakout board (assembled and tested)
Jargon buster
Plain-language definitions for the technical terms used above.
- 3.3V regulator
- A 3.3V regulator is a power circuit that provides a steady 3.3 volts for parts that need that supply voltage. On a breakout board, it can let the sensor run safely even when the connected microcontroller or power source uses a higher voltage.
- breakout
- A breakout is a small circuit board that makes a tiny or hard-to-solder component easier to connect to with standard pins. It matters because this OLED module can be wired into a microcontroller project without needing to solder directly to the display’s fine contacts.
- I2C
- I2C is a two-wire communication bus used by many sensors and small modules. It matters because several I2C devices can share the same two wires, but each device needs a compatible address and your controller must support I2C.
- Qwiic
- Qwiic is a plug-in connector system for I2C devices that uses small 4-pin cables, so you can connect compatible sensors without soldering. It matters because your controller or adapter also needs Qwiic, or you will need a cable or breakout to wire it up.
- STEMMA
- A plug-and-cable connection system used on some maker electronics boards to make wiring simpler. If a product uses STEMMA, you need the matching cable or connector type to plug it in without soldering.
- STEMMA QT
- A small plug-in connector system for I2C boards that lets you connect compatible sensors and controllers without soldering. It matters because it can make wiring faster and less error-prone, especially when adding several small modules to a project.
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