// --- Adjustable settings ---
const int analogPin = A0;    // Analog pin to read from
const float Vref = 5.0;      // Reference voltage (depends on Arduino model and supply)
const int ADC_resolution = 1023; // For 10-bit ADC: 0–1023

void setup() {
  Serial.begin(9600);        // Start serial communication at 9600 baud
}

void loop() {
  int rawValue = analogRead(analogPin);     // Read the analog value (0–1023)
  float voltage = (rawValue * Vref) / ADC_resolution; // Convert to voltage

  Serial.print("Raw ADC Value: ");
  Serial.print(rawValue);
  Serial.print("  -->  Voltage: ");
  Serial.print(voltage, 3);  // Print voltage with 3 decimal places
  Serial.println(" V");

  delay(500); // Update every 500ms
}