void setup()
{
  pinMode(34, INPUT); //MQ2
  pinMode(33, INPUT); //LDR
  pinMode(35, INPUT); //VIBRATION SENSOR 
  pinMode(32, INPUT); //POTENTIOMETER
  pinMode(4, OUTPUT);  // Buzzer
  pinMode(2, OUTPUT); // Green
  pinMode(23, OUTPUT); // Yellow
  pinMode(5, OUTPUT);  // Red
  Serial.begin(115200);
  Serial.println("Smart Home System");
}

void loop()
{
  int L = analogRead(33);
  int light = map(L,0,4095,0,100);
  Serial.print("Light level: ");
  Serial.print(light);  
  Serial.println("%");

  int G = analogRead(25);
  int gas = map(G,0,4095,0,100);
  Serial.print("Gas level: ");
  Serial.print(g);  
  Serial.println("%");

  int V = analogRead(14);
  int vibration = map(V,0,4095,0,100);
  Serial.print("Vibration level: ");
  Serial.print(vibration);
  Serial.println("%");

  int S = analogRead(32);
  int sound = map(S,0,4095,0,100);
  Serial.print("Sound level: ");
  Serial.print(sound);
  Serial.println("%");

//Abormal Levels Detected for any of the parameters
  if (sound>70||vibration>70||gas>70||light>70)
  {
    digitalWrite(16,HIGH);
    digitalWrite(23,LOW);
    digitalWrite(5,LOW);
    digitalWrite(4,LOW);
  }

// Yellow ON if any two or more parameters >70
if ( (sound > 70 && vibration > 70) ||
     (sound > 70 && gas > 70)       ||
     (sound > 70 && light > 70)     ||
     (vibration > 70 && gas > 70)   ||
     (vibration > 70 && light > 70) ||
     (gas > 70 && light > 70) ) {

  digitalWrite(16, LOW);   // red off
  digitalWrite(23, HIGH);  // yellow on
  digitalWrite(5, LOW);    // green off
  digitalWrite(4, LOW);    // others off
}

//Abormal Levels Detected for any of the parameters
  if (sound>70 && vibration>70 && gas>70 && light>70)
  {
    digitalWrite(16,LOW);
    digitalWrite(23,LOW);
    digitalWrite(5,HIGH);
    digitalWrite(4,HIGH);
  }
}