fbpx

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

  • PIR Sensor.
  • PIC16f877a MicroController.

Pinout

  • Vcc: +5v.
  • OutPut: 3.3v.
  • Gnd:Gnd.

Circuit

Leave a Reply

Your email address will not be published. Required fields are marked *