PIR Senesor / Motion Sensor using Arduino 

Code

/*
PIR SENSOR / MOTION SENSOR
https://electronicassist.blogspot.in/
ARJUN ARANGIL
9444868542
*/
int ledPin   = 13;                 // choose the pin for the LED
int inputPin = 2;                  // choose the input pin (for PIR sensor)
int leda     = 12;                 // choose the pin for the LED
int ledb     = 11;                 // choose the pin for the LED
int pirState = LOW;                // we start, assuming no motion detected
int val      = 0;                  // variable for reading the pin status

void setup() 
{
  pinMode(ledPin, OUTPUT);         // declare LED as output
  pinMode(leda, OUTPUT);           // declare LED as output
  pinMode(ledb, OUTPUT);           // declare LED as output
  pinMode(inputPin, INPUT);        // declare sensor as input  
}

void loop()
{
  val = digitalRead(inputPin);     // read input value
  if (val == HIGH)                 // check if the input is HIGH
  
    { 
      digitalWrite(ledPin, HIGH);  // turn LED ON
      delay(500);                  // .5sec delay
      digitalWrite(leda, HIGH);    // turn LED ON
      delay(500);                  // .5sec delay
      digitalWrite(ledb, HIGH);    // turn LED ON
      }
      
  else
     {
       digitalWrite(ledPin, LOW);  // turn LED OFF
       digitalWrite(leda, LOW);    // turn LED OFF
       digitalWrite(ledb, LOW);    // turn LED OFF
       }

}