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(32, OUTPUT);
  pinMode(25, OUTPUT);
  pinMode(13, 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();
  Serial.println(distance);
if (distance>=300)
 {
  digitalWrite(32, HIGH);
  digitalWrite(25, LOW);
  digitalWrite(13, LOW);
  Serial.println("You are safe");
}
else if(distance>200 && distance<300)
 {
  digitalWrite(25, HIGH);
  digitalWrite(32, LOW);
  digitalWrite(13, LOW);
  Serial.println("You are not safe");
}
else if(distance<=200)
{
  digitalWrite(13, HIGH);
  digitalWrite(32, LOW);
  digitalWrite(25, LOW);
  Serial.println("You are danger");
}
}