Interface PIR With PIC

Description

Passive Infrared Sensor which uses the IR to detect the motion. It detects an object that has moved in or out of the sensor range.

• PIR is basically made up of a pyroelectric sensor.
• The round metal with a rectangular crystal in the center, which can detect the level of infrared radiation.
• The sensor in a motion detector is actually split into two halves.
• When the sensor is idle, both slots detect the same amount of IR.
• When motion detected it first intercepts one half of the PIR sensor.
• When the warm body leaves the sensing area, the reverse happens, whereby the sensor generates a negative differential change.
• The PIR detects motion, the output pin will go “high” to 3.3V.

Application

• SmartPhone.

Hardware Required

Pinout

Circuit