January 2018
Intermediate to advanced
524 pages
13h 33m
English
Content preview from Internet of Things for Architects
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PIR sensors
Pyroelectric Infrared (PIR) sensors contain two slots filled with material that reacts to IR radiation and heat. Typical use cases are security, or warm-body movement. In its simplest form, a Fresnel lens sits on top of the PIR sensor, allowing both slots to form a widening arc outward. These two arcs create detection zones. When a warm body enters one of the arcs, or leaves one, it generates a signal that is sampled. The PIR sensors use a crystalline material that generates current when subjected to IR radiation. A Field Effect Transistor (FET) detects the change in current, and sends the signal to an amplification unit. PIR sensors respond well in the 8 to 14 um range, which is typical of a human body.
The following diagram ...
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