Implement an Exponential Moving Average (EMA)

float emaVoltage = 0.0;
const float alpha = 0.1;

float getExponentialMovingAverage(int pin) {
  float currentVoltage = analogRead(pin) * (5.0 / 1023.0);
  emaVoltage = (alpha * currentVoltage) + ((1 - alpha) * emaVoltage);
  return emaVoltage;
}