sensor PIR
Lights automatically using PIR
sensor is applied to the house that works to save or minimize use of electrical energy in the home. In this tool is the main component is a
microcontroller (AT89S51) and PIR
sensor (passive infrared).
Microcontroller here serves as a controller of the tool, where the
microcontroller has completed courses which will function to run the tool, aided by the PIR sensor. PIR sensor is used to detect changes in body temperature.
How the light was automated using PIR
sensor lights will switch on otmatis if the PIR
sensor detects human body temperature changes and reverse lights off automatically when the PIR sensor does not detect any changes in body temperature.
PIR
sensor can detect the body temperature of at least 34 degrees Celsius and human wavelengths ranging from 9 to 10 micrometers in front of the
sensor. From this description it can be concluded that PIR sensors work well only in humans.
works sensor PIR
Infrared emission from the human body is focused by the Fresnel lens is then filtered by filter infrared rays. Infrared rays will generate a voltage. Voltage generated by the pyroelectric
sensor was upheld by an amplifier. Output from this amplifier will then be compared with the stress triggers.