int trigger=4;
int echo=5;
int r=26,o=33,g=32;
void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
 
  pinMode(trigger, OUTPUT);
  pinMode(echo, INPUT);
  pinMode(r, OUTPUT);
  pinMode(o, OUTPUT);
  pinMode(g, 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 d=finding_distance();
  if (d>300){
  Serial.println("You are safe");
  digitalWrite(g,HIGH);
  digitalWrite(o, LOW);
  digitalWrite(r, LOW);
  }
  else if (200<d && d<300){
  Serial.println("You are unsafe");
  digitalWrite(o, HIGH);
  digitalWrite(r, LOW);
  digitalWrite(g, LOW);
  }
  else{
  Serial.println("You are in DANGER!!!");
  digitalWrite(r, HIGH);
  digitalWrite(o, LOW);
  digitalWrite(g, LOW);
  }

  // put your main code here, to run repeatedly:
   // this speeds up the simulation
}