Micro Wake Word docs (#3603)

components/micro_wake_word.rst

@@ -0,0 +1,109 @@
+Micro Wake Word
+================
+
+.. seo::
+    :description: Instructions for creating a custom wake word using microWakeWord.
+    :image: voice-assistant.svg
+
+ESPHome implements an on-device wake word detection framework from `microWakeWord <https://github.com/kahrendt/microWakeWord>`__.
+This repository/library allows you to create a custom wake word for your ESPHome device.
+
+The training process is described on the `microWakeWord GitHub repository <https://github.com/kahrendt/microWakeWord>`__.
+
+The ``micro_wake_word`` component requires an **ESP32-S3** to function.
+
+.. code-block:: yaml
+
+    # Shorthand name
+    micro_wake_word:
+      model: okay_nabu
+
+    # Github shorthand URL
+    micro_wake_word:
+      model: github://esphome/micro-wake-word-models/models/okay_nabu.json
+
+Configuration variables:
+------------------------
+
+- **model** (**Required**, string): The model to use. This can be one of:
+
+  - A simple name of a model that exists in the official `ESPHome Models repository <https://github.com/esphome/micro-wake-word-models>`__.
+    e.g. ``okay_nabu``.
+  - A github shorthand URL to a model JSON file.
+    e.g. ``github://esphome/micro-wake-word-models/models/okay_nabu.json@main``.
+  - A full URL to a model JSON file.
+    e.g. ``https://github.com/esphome/micro-wake-word-models/raw/main/models/okay_nabu.json``.
+
+- **on_wake_word_detected** (*Optional*, Automation): An automation to perform when the wake word is detected.
+
+The below two options are provided by the JSON file, but can be overridden in YAML.
+
+- **probability_cutoff** (*Optional*, float): The probability cutoff for the wake word detection.
+  If the probability of the wake word is below this value, the wake word is not detected.
+  A larger value reduces the number of false accepts but increases the number of false rejections.
+- **sliding_window_average_size** (*Optional*, int): The size of the sliding window average for the wake word detection. A small value lowers latency but may increase the number of false accepts.
+
+Model JSON
+----------
+
+.. code-block:: json
+
+    {
+      "type": "micro",
+      "wake_word": "okay nabu",
+      "author": "Kevin Ahrendt",
+      "website": "https://www.kevinahrendt.com/",
+      "model": "./okay_nabu.tflite",
+      "version": 1,
+      "micro": {
+        "probability_cutoff": 0.5,
+        "sliding_window_average_size": 10
+      }
+    }
+
+The model JSON file contains the following fields that are all **required**:
+
+- **type** (string): The type of the model. This should always be ``micro``.
+- **wake_word** (string): The wake word that the model is trained to detect.
+- **author** (string): The name of the author that trained the model.
+- **website** (string): The website of the author.
+- **model** (string): The relative or absolute path or URL to the TFLite trained model file.
+- **version** (int): The version of the JSON schema. Currently only version ``1`` exists.
+- **micro** (object): The microWakeWord specific configuration.
+
+  - **probability_cutoff** (float): The probability cutoff for the wake word detection.
+    If the probability of the wake word is below this value, the wake word is not detected.
+  - **sliding_window_average_size** (int): The size of the sliding window average for the wake word detection.
+
+
+Automations
+-----------
+
+``micro_wake_word.start`` Action
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Starts the wake word detection.
+
+``micro_wake_word.stop`` Action
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Stops the wake word detection.
+
+Example usage
+-------------
+
+.. code-block:: yaml
+
+    micro_wake_word:
+      model: okay_nabu
+      on_wake_word_detected:
+        then:
+          - voice_assistant.start:
+
+
+See Also
+--------
+
+- :doc:`voice_assistant`
+- :apiref:`micro_wake_word/micro_wake_word.h`
+- :ghedit:`Edit`