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 20m optical band-pass filter. The STHS34PF80 has output data rates between 0.25 to 30 Hz and an available single-shot, which are accessed through its IC/SPI interface.

Get Started with the Sparkfun Qwiic Human Presence and Motion Sensor

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: 10A
• Interfaces: IC or SPI
• Optical wavelength: 5 to 20m
• Range: 4m (objects 70 x 25 cm 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 85C (default gain mode)
• Sensor accuracy: 0.3C (local)
• One-shot mode
• Factory Calibrated

Resources

• Schematic
• Eagle Files
• Board Dimensions
• Hookup Guide
  • Arduino Library
• Component Datasheets:
  • STHS34PF805 Product Page
    • STHS34PF805 Datasheet
• Qwiic Ecosystem
• GitHub Hardware Repository’