US Sensor + Temperature Sensor Buzzer Pitch Controller

///////////////////////////////////////////////////////////
// CONTROL PITCH USING COMBINATION OF US SENSOR AND TEMP //
///////////////////////////////////////////////////////////

long duration, inches, cm;
int celsius = 0, fahrenheit = 0;

void setup()
{
  pinMode(7, OUTPUT);   // ping
  pinMode(6, INPUT);    // input
  pinMode(5, OUTPUT);   // led
  pinMode(4, OUTPUT);   // buzzer_US
  pinMode(3, OUTPUT);   // buzzer_temp
  pinMode(A0, INPUT);   // temp
}

void loop()
{
  digitalWrite(7, LOW);
  delayMicroseconds(2);
  digitalWrite(7, HIGH);
  delayMicroseconds(10);
  digitalWrite(7, LOW);

  duration = pulseIn(6, HIGH);
  inches = msToInch(duration);
  cm = msToCm(duration);

  celsius = map(((analogRead(A0) - 20) * 3.04), 0, 1023, -40, 125);
  fahrenheit = ((celsius * 9) / 5 + 32);

  if (cm <= 150) { digitalWrite(5, HIGH); }
  else { digitalWrite(5, LOW); }

  tone(4, cm + (celsius * 2), 500);

  delay(500);
}

long msToInch(long ms) {
    return ms / 74 / 2;
}

long msToCm(long ms) {
    return ms / 29 / 2;
}