readanalogserialwithtone.ino

/*
  AnalogReadSerial + Power & Ground
  Reads an analog input on pin A2, prints the result to the Serial Monitor.
  Graphical representation is available using Serial Plotter (Tools > Serial Plotter menu).
  Plug a potentiometer into A0, A2, and A4.
  
  This example code is in the public domain.
  http://www.arduino.cc/en/Tutorial/AnalogReadSerial
*/

// the setup routine runs once when you press reset:
void setup() {
  // initialize serial communication at 9600 bits per second:
  Serial.begin(9600);
  pinMode(A0, OUTPUT);
  pinMode(A4, OUTPUT);
  digitalWrite(A0, HIGH);
  digitalWrite(A4, LOW);
}

// the loop routine runs over and over again forever:
void loop() {
  // read the input on analog pin 0:
  int sensorValue = analogRead(A2);
  // print out the value you read:
  Serial.println(sensorValue);
  tone(9, sensorValue);
  delay(1);        // delay in between reads for stability
}