Automated Room Light

// This code is edited by Omer Mucahit And Katie Millican
//Original author of the code: Kristian Gohlke / krigoo (_) gmail (_) com / http://krx.at


int calibrationTime = 20;   
#define publish_delay 60000
unsigned int lastPublish = 0;

//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 =180000;  

boolean lockLow = true;
boolean counter = true;
boolean takeLowTime;  
int i = 0;
int z=0;

int pirPin = D4;    //the digital pin connected to the PIR sensor's output PIR Sensor (Rev B) 555-28027
int ledPin = D0;
int lightPin = A1;  //Photoresistor - VT935G-B  350-00009
int lightVal = analogRead(lightPin);

/////////////////////////////
//SETUP
//Setup also activates the serial communication to diagnose the problem with the code.
void setup(){
    Particle.variable("LightValue" , lightVal);
  Serial.begin(9600);
  pinMode(pirPin, INPUT);
  pinMode(ledPin, OUTPUT);
  digitalWrite(pirPin, LOW);
  pinMode(lightPin, INPUT);
  //give the sensor some time to calibrate and give some time to connect serial port
  Serial.print("calibrating sensor ");
    for(int i = 0; i < calibrationTime; i++){
      Serial.print(".");
      delay(500);
      }
    Serial.println(" done");
    Serial.println("SENSOR ACTIVE");
    Serial.print("Light Value ==> ");
    Serial.println(lightVal);
    delay(50);
    
  }

////////////////////////////
//LOOP
void loop(){
    
    

       lightVal = analogRead(lightPin);
     
       
      
      
       
  
     if(digitalRead(pirPin) == HIGH && lightVal < 1300){
       digitalWrite(ledPin, HIGH);
      if (counter){
      i++;
     
       Serial.print("Number of state change ==> ");
       Serial.println(i);
      }
      counter=false; //This counter counts the state change of pid sensor. It can be used to determine the light on and off state and can be used to calculate if somebody is in the room or not. 
       //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"); 
         Serial.print("Light Value ==> ");
         Serial.println(lightVal);
         Particle.publish("Motion-Detected", "Someone is in the room" );
         delay(50);
         }         
         takeLowTime = true;
       }
      

     if(digitalRead(pirPin) == LOW){       
       digitalWrite(ledPin, LOW); 
       counter=true;
        
   

       if(takeLowTime){
        lowIn = millis();          //save the time of the transition from high to LOW
        takeLowTime = false; 
        Serial.println(lightVal);//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");
           Serial.println(lightVal);
           Particle.publish("Motion-STOPPED", "Room is empty");
           i=0;
           delay(50);
           }
       }
         unsigned long now = millis();
    if ((now - lastPublish) < publish_delay) {
        return;
    }
//Thing speak integration
    int value = analogRead(A0);
    Particle.publish("thingSpeakWrite_A1", "{ \"1\": \"" + String(lightVal) + "\", \"k\": \"XXXXXXXXXXXXXXXX\" }", 60, PRIVATE);
    lastPublish = now;

     
  }