int trigger=4;
int echo=5;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  pinMode(trigger, OUTPUT);
  pinMode(echo, INPUT);
  pinMode(13, OUTPUT);
  pinMode(12, OUTPUT);
  pinMode(25, OUTPUT);
}

int distance()
{
  digitalWrite(trigger, HIGH);
  delay(100);
  digitalWrite(trigger, LOW);
 float distance = pulseIn(echo, HIGH);
 return (distance*0.034/2);  
}
void loop()
{  
int actual_distance=distance();
Serial.println(actual_distance);
delay(10);

 if (actual_distance>300)
{
  digitalWrite(13, HIGH);
  digitalWrite(25, LOW);
  Serial.println("Your are safe");
  delay(1000);


}
else if  (actual_distance<300 & actual_distance>200)
{
  digitalWrite(12, HIGH);
  digitalWrite(13, LOW);
  Serial.println("Your are unsafe");
  delay(1000);


}
else{

  digitalWrite(25, HIGH);
  digitalWrite(12, LOW);
  Serial.println("Your in danger");
  delay(1000);
}
}