int trigger=25;
int echo=13;
int red=19;
int green=18;
int orange=5;
void setup() {
  Serial.begin(115200);
  pinMode(trigger, OUTPUT);
  pinMode(echo, INPUT);
  pinMode(red, OUTPUT);
  pinMode(green, OUTPUT);
  pinMode(orange, 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 distancce=finding_distance();
  if (distance>=300);{
  Serial.println('you are in safezone');
  digitalWrite(green, HIGH);}
  else if( 300>distance>=200);{
  Serial.println('you are in unsafe zone');
  digitalWrite(orange, HIGH);}
  else{
  Serial.println('you are in danger zone');
  digitalWrite(red, HIGH);}
}