// https://forum.arduino.cc/t/what-filter-algorithm-to-use/1117083/42

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const float maxDifference = 0.01;
float dataSum = 0.0;
float dataAverage = data[0];

const uint8_t bufferSize = 9;
uint8_t currentIndex = 0;
uint8_t oldestIndex = 0;
float circularBuffer[bufferSize];

void addToBuffer(float value) {
  circularBuffer[currentIndex] = value;
  currentIndex = (currentIndex + 1) % bufferSize;
  if (currentIndex == oldestIndex) {
    oldestIndex = (oldestIndex + 1) % bufferSize;
  }
}

float readOldestValue() {
  return circularBuffer[oldestIndex];
}

void setup() {
  Serial.begin(115200);
  for (int j = 0; j < bufferSize; j++) addToBuffer(data[0]); // initialize

  for (int i = 0; i < 2657; i++) {
    if (data[i] < (dataAverage - maxDifference)) addToBuffer(data[i] - maxDifference);
    else if (data[i] > (dataAverage + maxDifference)) addToBuffer(data[i] + maxDifference);
    else addToBuffer(data[i]);

    for (int j = 0; j < bufferSize; j++) dataSum += circularBuffer[j];
    dataAverage = dataSum / (float)bufferSize;
    dataSum = 0.0;

    Serial.print(data[i]);
    Serial.print(",");
    Serial.print(dataAverage);
    Serial.println(",");
    delay(1);
  }
}

void loop() {
}