[Home Assistant] Template sensor which combines door lock and contact sensor

Cool template sensor idea I found here, which combines the states of two sensors and display the different combined states. Useful if, for example, you want to combine a door lock and a contact sensor on the same door.

Settings -> Devices & services -> Helpers -> Create Helper -> Template

{% if is_state('lock.kellertur', 'locked') and is_state('binary_sensor.kellertur_contact', 'off') %}
  Locked
{% elif is_state('lock.kellertur', 'unlocked') and is_state('binary_sensor.kellertur_contact', 'on') %}
  Open
{% elif is_state('lock.kellertur', 'unlocked') and is_state('binary_sensor.kellertur_contact', 'off') %}
  Closed, Unlocked
{% elif is_state('lock.kellertur', 'locked') and is_state('binary_sensor.kellertur_contact', 'on') %}
  Open, Locked 
{% else %}
  Unknown
{% endif %}

Helpful to check whether a door is really closed when locking it via a smart lock. Because else it could happen, that you would see status “Locked“, although the door is still open. But with this helper, you will get in this situation “Open, Locked“.

To emphasize such a situation even more clearly, you can of course also add some icon colors.