int buzPin=2;
int potVal;
int potPin=A0;
float dt;
void setup() {
  // put your setup code here, to run once:
  pinMode(buzPin, OUTPUT);
  pinMode(potPin, INPUT);
  Serial.begin(9600);
}

void loop() {
  potVal=analogRead(potPin);
  dt=1000-(940.0*potVal/1023.0);
  digitalWrite(buzPin, HIGH);
  delayMicroseconds(dt);
  digitalWrite(buzPin,LOW);
  delayMicroseconds(dt);
  Serial.println(dt);
  delay(1000);
}