#include "Ultrasonic.h"
Ultrasonic ultrasonic(13,12);
int distance;
const int buzzerPin = 11;

void setup() {
  Serial.begin(9600);
  
}

void loop() {

  // put your main code here, to run repeatedly:
 distance = ultrasonic.read(CM);
 Serial.print("Distance in CM:");
 Serial.println(distance);
 delay(1000);
 

 if(distance < 100){ tone(buzzerPin, 1000, 1000); 

  }
 else if(distance >= 100 && distance <= 300 ){ tone(buzzerPin, 400, 500); 

  }

  else {  
noTone(buzzerPin); // Arrête le son
      }


}