home-assistant.io/source/_cookbook/python_component_automation.markdown

---
title: "Automation in Code"
description: "A sample to do automations in Python Code."
ha_category: Automation in Python Examples
---

Example integration to target an `entity_id` to:

 - turn it on at 7AM in the morning
 - turn it on if anyone comes home and it is off
 - turn it off if all lights are turned off
 - turn it off if all people leave the house
 - offer a service to turn it on for 10 seconds

To set it up, add the following lines to your `configuration.yaml` file:

```yaml
# Example configuration.yaml entry
example:
  target: TARGET_ENTITY
```

{% configuration %}
target:
  description: TARGET_ENTITY should be one of your devices that can be turned on and off, e.g., a light or a switch. Example value could be light.Ceiling or switch.AC (if you have these devices with those names).
  required: true
  type: string
{% endconfiguration %}

Create the file `<config dir>/custom_components/example.py` and copy paste the content below:

```python
"""
Example of a custom component.
"""
import logging
import time

import voluptuous as vol

import homeassistant.components as core
import homeassistant.helpers.config_validation as cv
from homeassistant.components import device_tracker, light
from homeassistant.const import (ATTR_ENTITY_ID, SERVICE_TURN_OFF,
                                 SERVICE_TURN_ON, STATE_HOME, STATE_NOT_HOME,
                                 STATE_OFF, STATE_ON)
from homeassistant.core import split_entity_id
from homeassistant.helpers.event import (async_track_state_change,
                                         async_track_time_change)

# The domain of your component. Should be equal to the name of your component.
DOMAIN = "example"

# List of integration names (string) your integration depends upon.
# We depend on group because group will be loaded after all the integrations that
# initialize devices have been setup.
DEPENDENCIES = ['group', 'device_tracker', 'light']

# Configuration key for the entity id we are targeting.
CONF_TARGET = 'target'

# Variable for storing configuration parameters.
TARGET_ID = None

# Name of the service that we expose.
SERVICE_FLASH = 'flash'

# Shortcut for the logger
_LOGGER = logging.getLogger(__name__)

# Validate that all required config options are given.
CONFIG_SCHEMA = vol.Schema({
    DOMAIN: vol.Schema({
        vol.Optional(CONF_TARGET): cv.entity_id
    })
}, extra=vol.ALLOW_EXTRA)

async def async_setup(hass, config):
    """Setup example component."""
    TARGET_ID = config[DOMAIN][CONF_TARGET]

    domain = split_entity_id(TARGET_ID)[0]
    data = {ATTR_ENTITY_ID: TARGET_ID}

    # Validate that the target entity id exists.
    if hass.states.get(TARGET_ID) is None:
        _LOGGER.error("Target entity id %s does not exist",
                      TARGET_ID)

        # Tell the bootstrapper that we failed to initialize and clear the
        # stored target id so our functions don't run.
        TARGET_ID = None
        return False

    async def async_switch_on(entity_id, old_state, new_state):
        """Callback to turn on our target entity"""
        # If the target id is not set, return
        if not TARGET_ID:
            return

        if not core.is_on(hass, TARGET_ID):
            await hass.services.async_call(domain, SERVICE_TURN_ON, data)

    async def async_switch_off(entity_id, old_state, new_state):
        """Callback to turn off our target entity"""
        # If the target id is not set, return
        if not TARGET_ID:
            return

        if core.is_on(hass, TARGET_ID):
            await hass.services.async_call(domain, SERVICE_TURN_OFF, data)

    async def async_wake_up(service):
        """Turn light on in the morning.

        Turn the light on when called, but only if there are people home
        and it is not already on.
        """
        if not TARGET_ID:
            return

        if device_tracker.is_on(hass) and not core.is_on(hass, TARGET_ID):
            _LOGGER.info('People home at 7AM, turning target on')
            await hass.services.async_call(domain, SERVICE_TURN_ON, data)

    async def async_flash_service(service):
        """Service callback that will toggle the target.

        Set the light to off for 10 seconds if on and vice versa.
        """
        if not TARGET_ID:
            return

        if core.is_on(hass, TARGET_ID):
            # We need this call to run blocking, as we want to wait 10s after it finished
            await hass.services.async_call(domain, SERVICE_TURN_OFF, data, blocking=True)
            time.sleep(10)
            await hass.services.async_call(domain, SERVICE_TURN_ON, data)
        else:
            await hass.services.async_call(domain, SERVICE_TURN_ON, data, blocking=True)
            time.sleep(10)
            await hass.services.async_call(domain, SERVICE_TURN_OFF, data)

    # register the example.flash service
    hass.services.async_register(DOMAIN, SERVICE_FLASH, async_flash_service)

    # If all lights turn off, turn off.
    async_track_state_change(
        hass, light.ENTITY_ID_ALL_LIGHTS, async_switch_off, STATE_ON, STATE_OFF)

    # If all people leave the house and the entity is on, turn it off.
    async_track_state_change(
        hass, device_tracker.ENTITY_ID_ALL_DEVICES, async_switch_off, STATE_HOME, STATE_NOT_HOME)

    # If anyone comes home and the entity is not on, turn it on.
    async_track_state_change(
        hass, device_tracker.ENTITY_ID_ALL_DEVICES, async_switch_on, STATE_NOT_HOME, STATE_HOME)

    # Call wakeup callback at 7 AM
    async_track_time_change(hass, async_wake_up, hour=7, minute=00, second=00)

    # Tell the bootstrapper that we initialized successfully.
    return True
```