const int sensorPin = 34;   // Analog input pin on ESP32
const float alpha = 0.1;    // EMA smoothing factor (0 < alpha < 1)

float filtered = 0;

void setup() {
  Serial.begin(115200);
  delay(1000);
  pinMode(sensorPin, INPUT);
  Serial.println("Raw,Filtered");
}

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

  // Initialize filtered value on first read
  if (filtered == 0) {
    filtered = raw;
  } else {
    filtered = alpha * raw + (1 - alpha) * filtered;
  }

  // Print in CSV format for Serial Plotter
  Serial.printf("%d,%.2f\n", raw, filtered);

  delay(100); // Adjust sampling speed
}