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progArduino/poubelle_tests/pirSensor_test/pirSensor_test.ino 2.32 KB
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  /////////////////////////////
  //VARS
  //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);
             }
         }
    }