Arduino Smoothing algorithm

smoothing.ino

// taken from https://github.com/arduino/Arduino/issues/3934
// its an alternative to: https://www.arduino.cc/en/Tutorial/Smoothing

const int filterWeight = 4;  // higher numbers = heavier filtering
const int numReadings = 10;

int average = 0;                // the average

void setup() {
  // initialize serial communication with computer:
  Serial.begin(9600);
  // seed the filter
  average = analogRead(inputPin);
}
void loop() {
  for (int i = 0; i < numReadings; i++) {
    average = average + (analogRead(inputPin) - average) >> filterWeight;
  }
  Serial.println(average);
  delay(1);
}