const int potPin = 33;
int potValue;
float voltage =0;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
}

void loop() {
  // put your main code here, to run repeatedly:
  potValue = analogRead(potPin);
  voltage = (3.3/4095.0) * potValue;
  Serial.print(potValue);
  Serial.print(" = ");

  Serial.print(voltage);
  Serial.println("V");
  delay(25);
}