sensor:
  - platform: template
    id: ema_source
    name: EMA Source
    unit_of_measurement: "°C"
    accuracy_decimals: 1
    lambda: return 21.5;
    update_interval: 10s
  - platform: exponential_moving_average
    id: ema_alpha
    name: EMA Alpha
    sensor: ema_source
    alpha: 0.2
  - platform: exponential_moving_average
    name: EMA Time Constant
    sensor: ema_source
    time_constant: 5min
    time_weighting: previous
    restore: false

button:
  - platform: template
    name: EMA Reset
    on_press:
      - sensor.exponential_moving_average.reset: ema_alpha