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Proximity sensing with pyroelectric infrared

Posted: 26 Mar 2009     Print Version  Bookmark and Share

Keywords:proximity sensing  pyroelectric infrared  PSoC 

This application note by Cypress describes a complete proximity sensing application using a pyroelectric infrared (PIR) motion sensor. The analogue blocks of PSoC can be used to process the signal from a PIR motion sensor and detect the presence of objects that emit infrared light. This application note describes an application where PSoC is used to detect the presence of human beings to control an electric load. This circuit can be used for controlling a porch light or operating a door.

Humans, at normal body temperature, radiate infrared light waves at an approximate wavelength of 10µm. A pyroelectric infrared sensor can detect this infrared radiation and convert it to an electric charge. This charge is buffered through a FET and can be converted to voltage variations using a load resistor.

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