Untitled_Project by TXMEDIC

//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);
       }
   }

}