#include <Ultrasonic.h>
Ultrasonic sensor(9, 8);
int val;
int buzz = 6;
int high;


void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
  val = sensor.read(CM);
  high = val * -1 + 255;
  if(val <= 100)
  {
    analogWrite(buzz, high);
  }
  else{
    digitalWrite(buzz, LOW);
  }
  Serial.print(val);
  Serial.println(" cm");
  delay(50);
}