int readVal;
int waitT=250;
String myString="V2 = ";
int myVoltPin=A2;
float V2;

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

void loop() {
  // put your main code here, to run repeatedly:
readVal=analogRead(myVoltPin);
V2=(5./1023.)*readVal;
Serial.print(myString);
Serial.println(V2);
delay(waitT);
}