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    State machine

    The part of Home Assistant Core that holds the current state of every entity.

    In code
    hass.statesStateMachine

    Integrations write states to it, and everything else reads from it: automations, templates, dashboards. Writing goes through the entity, not straight to the state machine.

    Related terms

    • StateThe current value of an entity, like `on`, `21.5`, or `playing`, together with its attributes.
    • The hass objectThe `HomeAssistant` instance that integrations get, with access to the state machine, the event bus, actions, and the configuration.
    • EventA message on the event bus that something happened, like a state change or a button press. Any code can listen to events.