const int trigger=12,echo=13,buzzer=22;
float distance =0;
void setup() {
  Serial.begin(115200);
  pinMode(trigger, OUTPUT);
  pinMode(echo,INPUT);
}
int ultrasonic(){
  digitalWrite(trigger,HIGH);
  delay(1000);
  digitalWrite(trigger,LOW);
  float eh=pulseIn(echo,HIGH);
  distance=eh*0.034/2;
  return distance;
}
void loop() {
  int a=ultrasonic();
  if(a>0 && a<=5){
    tone(buzzer,1000);
    Serial.println("The values between 0 to 5 --- 1000Hz");
  }
  else if(a>5 && a<=10){
    tone(buzzer,5000);
    Serial.println("The values between 6 to 10 --- 5000Hz");
  }
  else if(a>10 && a<=15){
    noTone(buzzer);
    Serial.println("The values between 11 to 15 --- No sound");
  }
  else if(a>15 && a<=20){
    tone(buzzer,10000);
    Serial.println("The values between 16 to 20 --- 10000Hz");
  }
  else{
    Serial.println("Place the values between 0 to 20");
  }
}