int trigger=4;
int echo=5;
int red=14;
int orange=26;
int green=33;

void setup() 
{
  Serial.begin(115200);
  pinMode(trigger, OUTPUT);
  pinMode(echo, INPUT);
  pinMode(red, OUTPUT);
  pinMode(orange, OUTPUT);
  pinMode(green, OUTPUT);
}

int finding_distance()
{
  digitalWrite(trigger, HIGH);
  delay(100);
  digitalWrite(trigger, LOW);
  float a=pulseIn(echo, HIGH);
  return(a*0.034/2);
}
void loop() 
{
  int distance=finding_distance();
  if(distance>=300&&distance<=400){ 
  Serial.println("YOU ARE SAFE");
  digitalWrite(green,HIGH);
  digitalWrite(red, LOW);
  digitalWrite(orange, LOW);
  }
  else if(distance>=200&&distance<=300){
  Serial.println( "YOU ARE UNSAFE" );
  digitalWrite(orange, HIGH);
  digitalWrite(red, LOW);
  digitalWrite(green,LOW);
  }
  else{
  Serial.println("YOU ARE IN DANGER");
  digitalWrite(red, HIGH);
  digitalWrite(orange, LOW);
  digitalWrite(green, LOW);
  }
  delay(10000);
}