PIR Motion Sensor with Arduino

Hi folks 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.

 

List of components to make this prototype.

  1. Arduino UNO
  2. PIR Motion Sensor
  3. LED
  4. Jumper Wire

 

 

PIR Motion Sensor with Arduino Video tutorial.

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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);
           }
       }
  }

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3 Comments
  1. aravind 3 months ago

    sir its very urgent i made this project but the led is always on it is not turning off it shows motion detected at 30s but the motion never ends

  2. amirul nizam 3 months ago

    Hello, i would like to ask. after constructing all the component and upload the code into board.

    there are no changes on led after calibrating, motion detected all the time.

    covering the pir motion using cardboard, also did not response well.

    the led doesnt blink just like demonstration video.

    thank you.

  3. Profile photo of nabihah mardhiah
    nabihah mardhiah 3 months ago

    hye, if i’m not using LED, how can i know the sensor detect motion or not?

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