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Sense Stage Workshop » detection

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Posts Tagged ‘detection’

Infrared motion detector

May 8th, 2009

From Wikipedia:

A Passive InfraRed sensor (PIR sensor) is an electronic device that measures infrared (IR) light radiating from objects in its field of view. PIR sensors are often used in the construction of PIR-based motion detectors (see below). Apparent motion is detected when an infrared source with one temperature, such as a human, passes in front of an infrared source with another temperature, such as a wall.
All objects emit what is known as black body radiation. It is usually infrared radiation that is invisible to the human eye but can be detected by electronic devices designed for such a purpose. The term passive in this instance means that the PIR device does not emit an infrared beam but merely passively accepts incoming infrared radiation.

Amount in workshop: 4 (as part of the “environmental unit”).
How PIR Motion Sensors Work
datasheet
schematic

Author: marije Categories: Sensors Tags: , ,