const int POT_PIN = A0;
int lastRaw = -1;          // stores previous reading
const int threshold = 1;   // minimum change before printing

void setup() {
  Serial.begin(9600);
}

void loop() {
  int raw = analogRead(POT_PIN);

  // Only update if the reading changed enough
  if (abs(raw - lastRaw) >= threshold) {
    lastRaw = raw;

    float voltage = raw * (3.3 / 1023.0);     // actual measured voltage (3.3V ADC)
    float percent = (raw / 1023.0) * 100.0;

    float expected5V = raw * (5.0 / 1023.0);   // 5V equivalent

    Serial.print("Voltage: ");
    Serial.print(voltage, 2);
    Serial.print("V | ");

    Serial.print(percent, 1);
    Serial.print("% | ");

    Serial.print("5V Ref Equivalent: ");
    Serial.print(expected5V, 2);
    Serial.println("V");
  }

  delay(50);
}