int trigger_pin=3;
int echo_pin=2;
int time;
int dis;
void setup()
{
  Serial.begin(9600);
  pinMode(trigger_pin,OUTPUT);
  pinMode(echo_pin,OUTPUT);
  pinMode(4,OUTPUT);
  pinMode(5,OUTPUT);
  pinMode(6,OUTPUT);
  pinMode(7,OUTPUT);
}
void loop()
{
  digitalWrite(trigger_pin,HIGH);
  delayMicroseconds(500);
  digitalWrite(trigger_pin,LOW);
  time=pulseIn(echo_pin,HIGH);
  dis=(time*0.034)/2;
  Serial.println(dis);
  if(dis<=212)
  {
    Serial.println("No Danger.....!!");
    Serial.println("PARTY MUST GO ON....!!");
    digitalWrite(7,LOW);
    digitalWrite(6,LOW);
    digitalWrite(5,HIGH);
    digitalWrite(4,LOW);
  }
  if(dis<=133)
  {
    Serial.println("ALERT .....!!");
    Serial.println("PARTY MUST GO ON.....!!");
    digitalWrite(7,LOW);
    digitalWrite(6,HIGH);
    digitalWrite(5,LOW);
    digitalWrite(4,LOW);
  }
   if(dis<=36)
  {
    Serial.println("WARNING .....!!");
    Serial.println("STOP PARTY .....!!");
    digitalWrite(7,HIGH);
    digitalWrite(6,HIGH);
    digitalWrite(5,LOW);
    digitalWrite(4,LOW);
  }
  
}