control-my-light

simple website to control my home assistant enabled lights

why

well... i set down to study the other day, but then I stumbled about this reddit post, so now people can randomly change the color of the lights in my room

architecture

i created a small node.js webserver that provides the current rgba values, that a home assistant rest sensor can just check every few seconds or so. no port forwarding, nobody gets into my network, i can just locally disable the ha-automation and have my peace again, without people tempering with my lights anymore

how to use

server

if you use a setup similiar to mine, where you host multiple websites on an vps behind an ssl enabled nginx reverse proxy inside a docker container, you just need to adjust the environment variables in the docker-compose.yml file. then build with docker-compose build and start the container with docker-compose up -d. if you use another setup, it shouldn't be hard to adjust the docker-compose.yml accordingly or directly run the node.js server.

development

just type npm start and you will find the server on localhost/

home assistant

Just add the following rest sensor to your home assistant configuration.yaml. don't forget to change the url to you own server.

sensor:
  - platform: rest
   name: changemylight
   resource: "https://example.com/color/"
   scan_interval: 5

you can adjust the scan_interval according to how fast and often you want to change your colors. home assistant will just take the value from the last person that changed it, all other changes will not be stored

then add an automation like this:

alias: change my light
description: ''
trigger:
  - platform: state
    entity_id: sensor.changemylight
condition: []
action:
  - service: light.turn_on
    data_template:
      entity_id: light.your_light
      rgb_color:
        - >-
          {% set light = states("sensor.changemylight") | from_json
          %}{{light.r}}
        - >-
          {% set light = states("sensor.changemylight") | from_json
          %}{{light.g}}
        - >-
          {% set light = states("sensor.changemylight") | from_json
          %}{{light.b}}
      brightness: '{% set light = states("sensor.changemylight") | from_json %}{{light.a}}'
  - service: light.turn_on
    data_template:
      entity_id: light.your_second_light
      rgb_color:
        - >-
          {% set light = states("sensor.changemylight") | from_json
          %}{{light.r}}
        - >-
          {% set light = states("sensor.changemylight") | from_json
          %}{{light.g}}
        - >-
          {% set light = states("sensor.changemylight") | from_json
          %}{{light.b}}
      brightness: '{% set light = states("sensor.changemylight") | from_json %}{{light.a}}'
mode: restart

you can add as many lights as you want in the action section