#define BTN 7
#define SerialRate 115200

int button;
float buttonSmoothed;
float buttonBefore;

void setup()
{
  Serial.begin(SerialRate);
  pinMode(BTN, INPUT_PULLUP);
}

void loop()
{
  button = digitalRead(BTN);
  button = button * 100;

  buttonSmoothed = (button * 0.05) + (buttonBefore * 0.96);
  buttonBefore = buttonSmoothed;

  Serial.println(buttonSmoothed);
  delay(10);
}