int degr = 0;
const int filterLen = 10;
float filterArray[filterLen];
int filterShift = 0;
int filterDelay = 2;
void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  Serial.println("clear, noised, filtered");
}

void loop() {
  // put your main code here, to run repeatedly:
  float clearSignal = 100*sin(radians(degr++));
  float noiseSignal = clearSignal + random(-100,100);
   if (millis() % filterDelay == 0){
    filterArray[filterShift] = noiseSignal;
    if ((filterShift < filterLen-1) and (filterArray[filterShift] > filterArray[filterShift+1])){
      for (int i=filterShift; i < filterLen - 1; i++){
        if (filterArray[i] > filterArray[i+1]) {
          float buff = filterArray[i];
          filterArray[i] = filterArray[i+1];
          filterArray[i+1] = buff;
        }
      }
    } else {
      if ((filterShift > 0) and (filterArray[filterShift-1] > filterArray[filterShift])){
        for (int i=filterShift; i > 0; i--){
          if (filterArray[i] < filterArray[i-1]){
            float buff = filterArray[i];
            filterArray[i] = filterArray[i-1];
            filterArray[i-1] = buff;
          }
        }
      }
    }
    filterShift = (filterShift+1) % (filterLen);

  }
  float filteredSignal = filterArray[(int) (filterLen/2)];
  Serial.print(clearSignal);
  Serial.print(' ');
  Serial.print(noiseSignal);
  Serial.print(' ');
  Serial.println(filteredSignal);

}