Sample Low Pass Filter Code

low-pass-filter.ino

float alpha = 0.95; // Filter constant, higher value means more filtering
float prevValue = 0.0; // Previous filtered value
float filteredValue;

void setup() {
  Serial.begin(9600);
}

void loop() {
  float rawValue = analogRead(A0); // Read the raw analog input

  // Apply the low-pass filter
  filteredValue = rawValue * (1 - alpha) + prevValue * alpha;
  prevValue = filteredValue;

  // Print the filtered value
  Serial.println(filteredValue);

  delay(10); // Delay to control the sampling rate
}