volatile byte half_revolutions;
 unsigned int rpm;
 unsigned long timeold;
 
 
 int led = D2; 
 int led2 = D7;
 int sen1 = D4;
 int bluebutton = D6;
 int duration = 6000; // Contact Lens needs to be cleaned for min of 6 hours; for the sake of display, 6 secs = 6 hrs
 int tstarted =-1;
 volatile int state = 0;
 bool detected = FALSE;
 int lastState = 0;
 
 int TS_DAY_MILLIS (1000 * 26); 
 // Actual code below; Contact lens need to be changed after 26 days; for the sake of display, 1 sec = 1 day 
    //  #define TS_DAY_MILLIS (24 * 60 * 60 * 1000 * 26) 
unsigned long lastSync = millis();

void setup() 
{
   Serial.begin(9600);
    pinMode(led, OUTPUT);
    pinMode(led2,OUTPUT);
    pinMode(sen1, INPUT_PULLUP);
    attachInterrupt(sen1, magnet_detect, CHANGE);
    
//   attachInterrupt(D4, magnet_detect, CHANGE);//Initialize the intterrupt pin 
   half_revolutions = 0;
   rpm = 0;
   timeold = 0;
   Particle.variable("x",detected);
   digitalWrite (led2, LOW);
   
   pinMode( bluebutton , INPUT_PULLUP); // sets blue button pin as input
 }
 
void loop() 
{
    delay(100);
    // if( lastState != state){
    //       Serial.println("detect change");
    //       Serial.println(tstarted);
    //         //detected = state;
    // }
    if(detected==true&&tstarted==-1)
{
    tstarted=millis();
    Serial.println("CLEANING STARTED");
    Serial.println(tstarted);
}    
    if((tstarted !=-1) && (tstarted+duration < millis()) && state ==0) {
        
        Serial.println("YOUR CONTACTS ARE CLEANED!");
        Serial.println(tstarted);

        lastState = state;
        
      //  detected = int(state);
        digitalWrite(led, HIGH); 
        state = 1;
    //   if (half_revolutions >= 20) { 
    //      rpm = 30*1000/(millis() - timeold)*half_revolution;s
    //      timeold = millis();
    //      half_revolutions = 0;
    //      //Serial.println(rpm,DEC);
         
         
    //   }
        delay( 500 );
    }
    
    if (millis() - tstarted > TS_DAY_MILLIS) { 
        // Request time synchronization from the Particle Device Cloud
        Particle.syncTime();
        // lastSync = millis();
        Serial.println("TIME FOR A NEW PAIR OF CONTACTS");
        digitalWrite(led2, HIGH);
        
        delay( 500 );
    }
    

    int bbuttonState = digitalRead( bluebutton );
    
     if( bbuttonState == LOW && state == 1)
    {
         // tun the LED Off
         digitalWrite (led, LOW);
    }

}
 
 void magnet_detect()//This function is called whenever a magnet/interrupt is detected 
 {
    
    detected = TRUE;
//    state = !state;
//   half_revolutions++;
//   Serial.println("detected");
//   Serial.println(state);
 }