Part 1/7:
Understanding Motion Sensors: How They Work
Motion sensors are devices that have become commonplace in our daily lives, yet few people understand the science behind their operation. This summary delves into the mechanics of one of the most prevalent types: the passive infrared (PIR) sensor.
The Basics of Infrared Detection
Every living creature, including humans, emits thermal radiation in the form of infrared light due to their body heat. This phenomenon is rooted in the principle that all matter with a temperature above absolute zero emits thermal radiation. Because our bodies radiate this heat, sensors that detect infrared light have the potential to recognize our movement.