How to work PIR Motion Sensor with Arduino ?

I am back ones again to share with you my simple but useful project and step by step descriptive video to show you, how you can auto turn on the room Light when some come inside the room. It’s only work when someone moving in the room and after few second light will turn off automatically. To detect the motion I have used PIR Motion Sensor and program the arduino board to read the sensor signal and turn on the light for few second.

To make this prototype I am using:- Arduino UNO PIR Motion Sensor Jumper wire Breadboard

Arduino code for PIR Motion Sensor prototype

//the time we give the sensor to calibrate (10-60 secs according to the datasheet) int calibrationTime = 30;        //the time when the sensor outputs a low impulse long unsigned int lowIn;         //the amount of milliseconds the sensor has to be low //before we assume all motion has stopped long unsigned int pause = 5000;  boolean lockLow = true; boolean takeLowTime;  int pirPin = 3;    //the digital pin connected to the PIR sensor's output int ledPin = 13; ///////////////////////////// //SETUP void setup(){   Serial.begin(9600);   pinMode(pirPin, INPUT);   pinMode(ledPin, OUTPUT);   digitalWrite(pirPin, LOW);   //give the sensor some time to calibrate   Serial.print("calibrating sensor ");     for(int i = 0; i < calibrationTime; i++){       Serial.print(".");       delay(1000);       }     Serial.println(" done");     Serial.println("SENSOR ACTIVE");     delay(50);   } //////////////////////////// //LOOP void loop(){      if(digitalRead(pirPin) == HIGH){        digitalWrite(ledPin, HIGH);   //the led visualizes the sensors output pin state        if(lockLow){           //makes sure we wait for a transition to LOW before any further output is made:          lockLow = false;                     Serial.println("---");          Serial.print("motion detected at ");          Serial.print(millis()/1000);          Serial.println(" sec");          delay(50);          }                  takeLowTime = true;        }      if(digitalRead(pirPin) == LOW){              digitalWrite(ledPin, LOW);  //the led visualizes the sensors output pin state        if(takeLowTime){         lowIn = millis();          //save the time of the transition from high to LOW         takeLowTime = false;       //make sure this is only done at the start of a LOW phase         }        //if the sensor is low for more than the given pause,        //we assume that no more motion is going to happen        if(!lockLow && millis() - lowIn > pause){             //makes sure this block of code is only executed again after            //a new motion sequence has been detected            lockLow = true;                                   Serial.print("motion ended at ");      //output            Serial.print((millis() - pause)/1000);            Serial.println(" sec");            delay(50);            }        }   }