#define PINREAD A0

void setup() {
  // put your setup code here, to run once:
  //inizializzare la seriale
  Serial.begin(9600);
  while(!Serial);
}

void loop() {
  // put your main code here, to run repeatedly:
  //leggere il valore del pin analogico
  float digMeas = analogRead(PINREAD);
  float voltMeas = digMeas*5.0/ 1024;
  Serial.print("voltage read: ");
  Serial.println(voltMeas);
  delay(500);
}