Thermal pyroelectric infrared sensing automatic light circuit (1)

Published:2012/8/1 2:20:00 Author:Ecco | Keyword: Thermal, pyroelectric, infrared , sensing , automatic light | From:SeekIC

As shown in the figure, the circuit is a pyroelectric infrared sensing automatic light which can be used for stairs walkways , bathrooms and other occasions. The lights can be turned on when people come, turning off when people leave, and the lights are automatically locked during the day, so the lamps will not be lit. The PIR can use P228 pyroelectric infrared sensor. In order to improve its sensitivity, it is best for their installation of the Fresnel lens, and the focus of the lens should be located in the sensingwindow of sensor. RP is the circuit delay time adjustment potentiometer, and it can also use an ordinary fixed resistor.



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