Flash Lights When Intruder Detected

This example component will detect intruders. It does so by checking if lights are being turned on while there is no one at home. When this happens it will turn the lights red, flash them for 30 seconds and send a message via the notify component. It will also flash a specific light when a known person comes home.

This component depends on the components device_tracker and light being setup.

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

# Example configuration.yaml entry
  known_light: light.Bowl
  unknown_light: group.living_room

Configuration variables:

  • known_light (Optional): Which light/light group has to flash when a known device comes home.
  • unknown_light (Optional): Which light/light group has to flash red when light turns on while no one home.

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

"""Simple alarm component."""
import logging

import homeassistant.loader as loader
from homeassistant.components import device_tracker, light, notify
from homeassistant.helpers.event import track_state_change
from homeassistant.const import STATE_ON, STATE_OFF, STATE_HOME, STATE_NOT_HOME

DOMAIN = "simple_alarm"

DEPENDENCIES = ['group', 'device_tracker', 'light']

# Attribute to tell which light has to flash when a known person comes home
# If omitted will flash all.
CONF_KNOWN_LIGHT = "known_light"

# Attribute to tell which light has to flash when an unknown person comes home
# If omitted will flash all.
CONF_UNKNOWN_LIGHT = "unknown_light"

# Services to test the alarms

def setup(hass, config):
    """ Sets up the simple alarms. """
    logger = logging.getLogger(__name__)

    light_ids = []

        light_id = config[DOMAIN].get(conf_key, light.ENTITY_ID_ALL_LIGHTS)

        if hass.states.get(light_id) is None:
                'Light id %s could not be found in state machine', light_id)

            return False


    # pylint: disable=unbalanced-tuple-unpacking
    known_light_id, unknown_light_id = light_ids

    if hass.states.get(device_tracker.ENTITY_ID_ALL_DEVICES) is None:
        logger.error('No devices are being tracked, cannot setup alarm')

        return False

    def known_alarm():
        """ Fire an alarm if a known person arrives home. """
        light.turn_on(hass, known_light_id, flash=light.FLASH_SHORT)

    def unknown_alarm():
        """ Fire an alarm if the light turns on while no one is home. """
            hass, unknown_light_id,
            flash=light.FLASH_LONG, rgb_color=[255, 0, 0])

        # Send a message to the user
            hass, "The lights just got turned on while no one was home.")

    # Setup services to test the effect
        DOMAIN, SERVICE_TEST_KNOWN_ALARM, lambda call: known_alarm())
        DOMAIN, SERVICE_TEST_UNKNOWN_ALARM, lambda call: unknown_alarm())

    def unknown_alarm_if_lights_on(entity_id, old_state, new_state):
        """ Called when a light has been turned on. """
        if not device_tracker.is_on(hass):

        hass, light.ENTITY_ID_ALL_LIGHTS,
        unknown_alarm_if_lights_on, STATE_OFF, STATE_ON)

    def ring_known_alarm(entity_id, old_state, new_state):
        """ Called when a known person comes home. """
        if light.is_on(hass, known_light_id):

    # Track home coming of each device
        hass, hass.states.entity_ids(device_tracker.DOMAIN),
        ring_known_alarm, STATE_NOT_HOME, STATE_HOME)

    return True