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SparkFun Human Presence and Motion Sensor - STHS34PF80 (Qwiic)
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The STHS34PF80 sensor, from ST Microelectronics, is designed to measure the precise black-body radiation (as described by Planck's law) of an object; as well...
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The STHS34PF80 sensor, from ST Microelectronics, is designed to measure the precise black-body radiation (as described by Planck's law) of an object; as well as monitor ambient temperature conditions within its 80° field of view. The sensor is composed of a matrix of floating vacuum thermal transistors MOS split into two parts, one exposed to IR radiation and the other one shielded. The differential reading between the segments, allows the sensor to remove self-heating effects. The STHS34PF80 also incorporates algorithms to detect and discriminate between stationary and moving objects. These features enable the sensor to work as a human presence and motion sensor in different applications such as alarm systems, anti-intruder systems, smart lighting, and room occupancy.
The sensor can operate in multiple lighting conditions and is unaffected by visible light or other bands thanks to the 5 to 20µm optical band-pass filter. The STHS34PF80 has an output data rates between 0.25 to 30 Hz and an available single-shot, which are accessed through its I²C/SPI interface.
The SparkFun Qwiic Connect System is an ecosystem of I2C sensors, actuators, shields and cables that make prototyping faster and less prone to error. All Qwiic-enabled boards use a common 1mm pitch, 4-pin JST connector. This reduces the amount of required PCB space, and polarized connections mean you can’t hook it up wrong.
Features:
Breakout Board
- Dimensions: 1" x 1"
- Two Qwiic Connectors
- I2C Address (7-bit): 0x5A (Default)
- Four Mounting Holes:
- 4-40 screw compatible
- Six PTH Pins
- 3V3, GND, SCL, SDA, CS, INT
- Power LED (Red)
STHS34PF80 Features
- Voltage Range: 1.7 to 3.6V
- Current Draw: 10µA
- Interfaces: I²C or SPI
- Optical wavelength: 5 to 20µm
- Range: 4m (objects 70 x 25 cm² in size)
- Built-in Detection Algorithms:
- Identify stationary objects
- Distinguish between stationary and moving objects
- Field of View: 80°
- Output Data Rate: 0.25 to 30Hz
- IR sensitivity: 2000 LSB/°C
- RMS noise: 25 LSBrms
- Operating Temperature: -40 to 85°C (default gain mode)
- Sensor accuracy: ±0.3°C (local)
- One-shot mode
- Factory calibrated
Documents:
Jargon buster
Plain-language definitions for the technical terms used above.
- 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.
- CS
- CS stands for chip select, a control pin used by SPI devices to tell which connected device should listen. It matters when you connect more than one SPI module to the same microcontroller, because each device usually needs its own CS pin.
- 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.
- I2C address
- An I2C address is the number a device uses so a microcontroller can tell it apart from other devices on the same I2C bus. It matters because two devices with the same fixed address may conflict if used together.
- LED
- A light-emitting diode is a small electronic component that lights up when current flows through it in the correct direction. In this kit, LEDs create the flashing effect, so polarity and correct soldering matter for the project to work.
- LSB
- Least significant bit is the smallest step a digital converter can represent. In a DAC, it tells you the tiniest voltage change the output can make at a given resolution and output range.
- PCB
- A printed circuit board is a rigid board with copper tracks that connect electronic parts without loose wires. For this kit, the PCBs also form the airplane shape, so they are both the circuit base and part of the finished model.
- PTH
- Plated through-hole means the pin holes are metal-lined so solder connects the pad on both sides of the board. It is useful for connectors and headers that need a strong mechanical and electrical connection.
- 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.
- RMS
- RMS is a way of describing the effective level of an AC signal, such as an audio output voltage. It helps compare audio output levels more meaningfully than a peak voltage number.
- SPI
- A fast serial communication bus often used for displays, memory cards, and sensors. It matters because SPI devices need specific pins for clock and data, plus a separate chip-select line for each device.
Find this product in
Sensors & Input
SparkFun Human Presence Sensor Schematic
Schematic · 140.5 KB · Click any page to view full size
STHS34PF80 Sensor Datasheet
Datasheet · 2.1 MB · Click any page to view full size
SparkFun Human Presence Sensor Board Dimensions
Mechanical Drawings · 149.6 KB · Click any page to view full size
Supplier page — sparkfun.com
Supplier Description · 710.2 KB · Click any page to view full size
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