SLLA603 March   2023

 

  1.   Abstract
  2.   Trademarks
  3. 1Introduction
  4. 2Technical Overview
  5. 3Block Diagram
  6. 4Part Selection
  7. 5Stationary Target Detection
  8. 6Power Consumption
  9. 7Conclusion

1 Introduction

Passive Infrared (PIR) technology is currently widely used for motion detection applications due to the low power consumption and cost of this technology. However, when it comes to occupancy detection, most systems tend to employ more complex solutions, such as mmWave radar, due to the ability of mmWave radar to reliably detect stationary objects.

The challenge with PIR technology is the reliance on motion, because the sensors cannot detect stationary objects on their own. The PIR-based occupancy detector solves this problem by using a system of a motorized mirrors to feign movement of stationary targets to provide reliable occupancy detection.