int trigger=4;
int echo=5;
int ledred=14;
int ledyellow=26;
int ledgreen=32;
void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
 
  pinMode(trigger, OUTPUT);
  pinMode(echo, INPUT);
  pinMode(ledred, OUTPUT);
  pinMode(ledyellow, OUTPUT);
  pinMode(ledgreen, 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(ledred, HIGH);
    digitalWrite(ledgreen, LOW);
    digitalWrite(ledyellow, LOW);
    Serial.print("your safe");
    
  }
  else if(distance>=200&&distance<=300){
    digitalWrite(ledyellow , HIGH);
    digitalWrite(ledgreen , LOW);
    digitalWrite(ledred, LOW);

    Serial.print("your unsafe");
  
  }
  else if(distance <200){
  digitalWrite(ledgreen,HIGH);
  digitalWrite(ledgreen,LOW);
  digitalWrite(ledgreen,LOW);

  Serial.print("your in danger");

  }


  // put your main code here, to run repeatedly:
  delay(10); // this speeds up the simulation
}