int trigger=4;
int echo=33;
int red=12;
int orange=14;
int green=27;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  pinMode(trigger, OUTPUT);
  pinMode(echo, INPUT);
  pinMode(red,OUTPUT);
  pinMode(orange,OUTPUT);
  pinMode(green,OUTPUT);

}

int Ultra_sonic(){
  digitalWrite(trigger, HIGH);
  delay(100);
  digitalWrite(trigger, LOW);
 float recieved= pulseIn(echo, HIGH);
 float converted=(recieved*0.034/2)+1;
 return(converted);

}

void loop() {
  // put your main code here, to run repeatedly:
  int distance=Ultra_sonic();
  Serial.println(distance);
  delay(1000);
if(distance>=300){  
  digitalWrite(green,HIGH);
  digitalWrite(orange,LOW);
  digitalWrite(red,LOW);
  Serial.println("YOU ARE IN SAFE");
  noTone(26);
}
else if((distance<300) && (distance>=200)){ 
  digitalWrite(green,LOW);
  digitalWrite(orange,HIGH);
  digitalWrite(red,LOW);
  Serial.println("YOU ARE IN UNSAFE");
  noTone(26);
}
else if(distance<200){
  digitalWrite(green,LOW);
  digitalWrite(orange,LOW);
  digitalWrite(red,HIGH);
  Serial.println("YOU ARE IN DANGER");
  tone(26,4000);
}
}