int pinInput = A0;

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

}

void loop() {
  int  v = analogRead(pinInput);
  int  vmean= 512;

  Serial.print("v:");
  Serial.print(v);
  Serial.print(",vmean:");
  Serial.print(vmean);
  Serial.print("\n");
  delay(500);

}