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A commandline utility written in Kotlin to control your Elgato Key Light and Key Light Air.
 
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README.md

Happy Cat 🐈🌞

A commandline utility to control your Elgato Key Light and Key Light Air. Change your light settings easily inside scripts or use configuration files to automatically apply your preferred setup over the course of the day, possibly even exploring the use as a light therapy device.

Please report issues, bugs or feature requests here.

Usage

Happy cat is split up into multiple subcommands, each of which have their own parameters. To find out more about each command, check out the help pages by appending --help after the command.

Important: Happy cat uses Kelvin to measure light temperature, while Elgato lamps use their own format internally. Conversion between the two is done on the fly

Apply

Reads the provided configuration file, determines the currently active state based on time definitions and applies the state to the given light once. It's basically a oneshot version of the daemon command. For examples of the configuration file, check the corresponding paragraph below.

Example

hc apply ./elgato.config elgato.local

Daemon

Reads the given configuration file, then determines and applies the currently valid configuration every minute.

Example

hc daemon ./elgato.config elgato.local

Get

Reads and prints the current status of the specified light.

Example

hc get elgato.local

Set

Sets the given values of powerstatus, brightness and temperature to the specified light.

hc set -p ON -b 70 -t 4200 elgato.local

Configuration

To automatically apply settings, you can create your own configuration file which defines the settings for each timeframe. All values inside status are optional, if they are not defined, those parameters will remain unchanged. Timeframes can cross midnight, but must not overlap. If there are overlapping timeframes, the first valid timeframe will be chosen.

{
  "config": [
    {
      "start": "8:30",
      "end": "11:00",
      "status": {
        "power": "ON",
        "brightness": 100,
        "temperature": 6500
      }
    },
    {
      "start": "11:00",
      "end": "20:00",
      "status": {
        "brightness": 70,
        "temperature": 4300
      }
    },
    {
      "start": "20:00",
      "end": "8:30",
      "status": {
        "temperature": 3000
      }
    }
  ]
}

Automation

Probably one could automate the setup using systemd and/or cronjobs, but so far I didn't get to that.

Building

It should be enough to do a simple:

./gradlew build

You can then find the executable in build/bin/native/hcReleaseExecutable.

License

This software is licensed under the MPL 2.0, see the LICENSE file.