Raspberry Pi - PIR Motion Sensor test

PIR motion sensor used to detect whether a object which emits infrared radiation has moved in or out the sensor range. If the sensor detect a moving object, it make output signal. More infromation about the sensor can be found in the following web page. In order to test, the wiringPi must be installed.

http://www.dfrobot.com/wiki/index.php/PIR_Motion_Sensor_V1.0_SKU:SEN0171

The test circuit is shown as in figure.

Component

• Raspberry Pi 2 Model B
• PIR Motion Sensor (DFROBOT SEN0171)

In order to test, make a simple code which is pirTest.c

#include <stdio.h>

#include <wiringPi.h>

#define PIR 1

int main(void)

{

  if(wiringPiSetup() == -1)

    return 1;

  pinMode(PIR, INPUT);

  int input = 0;

  for(;;)

  {

    if(digitalRead(PIR))

      printf("Motion Detected!\n");

    delay(100);

  }

  return 0;

}

Compile and run the program.

pi@raspberrypi ~$ gcc -o pirTest pirTest.c -lwiringPi

pi@raspberrypi ~$ sudo ./pirTest

When a moving object is detected, "Motion Detected" message will be printed.