// constants (or #define with no ; at end of line) won't change. They're used here to set pin numbers:
int readPin = A3;
float v2;
int wait = 500;

// Variables will change:


void setup() {
pinMode (readPin, INPUT);

Serial.begin(115200);
  
  }

void loop() {

v2 = (5./1023.)*(analogRead (readPin));

//Serial.print(" = ");
Serial.print(v2);
Serial.println(" volts");
delay(wait);
}