int trigger=12;
int echo=14;


void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  pinMode(19, OUTPUT);//red
  pinMode(18, OUTPUT);//yellow
  pinMode(5, OUTPUT);//green
  pinMode(trigger,OUTPUT);
  pinMode(echo,INPUT);
}

void loop() 
{
int actual_distance=ultrasonic();
Serial.println(actual_distance);
if(actual_distance>=200 && actual_distance>=300)
{
   digitalWrite(19, HIGH);
   digitalWrite(18, LOW);
   digitalWrite(5, LOW);
   Serial.println("your safe");
}
  else if(actual_distance>=200)
  {
    digitalWrite(18, HIGH);
    digitalWrite(19, LOW);
    digitalWrite(5, LOW);
    Serial.println("your in unsafe");
  }
  else if(actual_distance<=100)  
  { 
    digitalWrite(5, HIGH);
    digitalWrite(18, LOW);
    digitalWrite(19, LOW);
    Serial.println("your danger");
  }
Serial.println(actual_distance);
delay(1000);
}

int ultrasonic () {
  digitalWrite(trigger, LOW);
  delay(10);
  digitalWrite(trigger,HIGH);
  delay(100);
  digitalWrite(trigger, LOW);
  int distance=pulseIn(echo,HIGH);
 // return(distance);
  return(distance*0.034/2)+1;
}