int trigger=4;
int echo=5;
int greenled = 21;
int redled = 25;
int orangeled = 33;
void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  pinMode(trigger, OUTPUT);
  pinMode(echo, INPUT);
  pinMode(greenled, OUTPUT);
  pinMode(redled, OUTPUT);
  pinMode(orangeled , 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){
    Serial.println("You are safe");
    digitalWrite(greenled, HIGH);
    digitalWrite(redled, LOW);
    digitalWrite(orangeled, LOW);
  }
  else{
    if (distance<200){
    Serial.println("You are danger");
    digitalWrite(redled, HIGH);
    digitalWrite(greenled, LOW);
    digitalWrite(orangeled, LOW);
    }
    if (distance > 200 && distance <300){
    digitalWrite(orangeled, HIGH);
    digitalWrite(greenled, LOW);
    digitalWrite(redled, LOW);
    Serial.println("You are somethig");
  }
  }
  
  // put your main code here, to run repeatedly:
  delay(10); // this speeds up the simulation
}