int trigger=5;
int echo=4;
int green=25;
int orange=33;
int red=12;
void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  pinMode(trigger, OUTPUT);
  pinMode(echo, INPUT);
  pinMode(green, OUTPUT);
  pinMode(orange, OUTPUT);
  pinMode(red, 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)
  {
  digitalWrite(green, HIGH);
  digitalWrite(orange, LOW);
  digitalWrite(red, LOW);
  Serial.println("You are safe");
  }
  else if(distance>200 && distance<300)
  {
  digitalWrite(orange, HIGH);
  digitalWrite(green, LOW);
  digitalWrite(red, LOW);
  Serial.println("You are unsafe");
  }
  else if(distance<200)
  {
  digitalWrite(red, HIGH);
  digitalWrite(green, LOW);
  digitalWrite(orange, LOW);
  Serial.println("You are in danger"); 
   }
}