// put your setup code here, to run once:
  void setup() {
  Serial.begin(115200);
  pinMode(A0, INPUT);
  if INPUT A0 OUTPUT tone(8, 262, 250);// Plays 262Hz tone for 0.250 seconds
}
void loop() {
  int value = analogRead(A0);
  Serial.println(value);
  delay(100);
tone(8, 262, 250); // Plays 262Hz tone for 0.250 seconds
}