configuration.yaml

# add this to your configuration.yaml in Home Assistant
sensor:
 - platform: ultrasonic
   trigger_pin: GPIO27
   echo_pin: GPIO14
   name: "Distance car"
   update_interval: 5s
   timeout: 4.0m

binary_sensor:
 - name: "Car detected"
   state: >
      {{ not(is_state('sensor.ultrasonic_control_garage_door_distance_car', 'unknown')) }}

cover:
  - platform: template
    covers:
      garage_door:
        device_class: garage
        unique_id: garage_door_safe
        friendly_name: "Garage door safe"
        value_template: >
          {{ states('cover.my_actual_garage_door') }}
        open_cover:
         — if:
           - condition: state
             entity_id: binary_sensor.car_detected
             state: "off"
           then:
             - service: cover.open_cover
               data: {}
               target:
                 entity_id: cover.my_actual_garage_door 
           else:
             - service: notify.all_devices
               data:
               message: >-
                 Garage can not be opened: blocked by car 
        close_cover:
          — if:
             - condition: state
               entity_id: binary_sensor.car_detected
               state: "off"
            then:
              - service: cover.open_cover
                data: {}
                target:
                  entity_id: cover.my_actual_garage_door 
            else:
             - service: notify.all_devices
               data:
               message: >-
                 Garage can not be closed: blocked by car