int leverButton = D1;
int flag =0;
int flagNew = 0;

void setup()
{
  pinMode(leverButton, INPUT_PULLUP);
  Serial.begin(9600);
}

void loop()
{
  int leverState;
  leverState = digitalRead(leverButton);
  if (leverState == 0){ //Knocked
    flagNew = 1;
  }
  else{
    flagNew = 0 ;
  }
  if (flagNew == flag){//state stays the same
    /*Serial.println("NO CHANGE IN BUTTON STATE");*/
  }
  else{
    if (flagNew == 1){//someone pushed the button
      Particle.publish("diotthanku2");
      Serial.println("EVENT PUBLISHED");
      delay(5000);
    }
    else {//the state went back to unpushed
      Serial.println("Knock stopped");
    }
  }
  flag = flagNew;
}