A LIFX Smart Bulb Utility for reflecting your Free/Busy Google Calendar Status

This is a Go-based utility that automatically controls a LIFX smart bulb based on your Google Calendar's free/busy status. When your calendar shows you as busy, the utility will set your LIFX bulb to a busy state (e.g., red). When you are free, it will set the bulb to a free state (e.g., white).

Features

• Monitors your Google Calendar for free/busy status
• Controls a LIFX bulb using the LIFX REST API
• Configuration via a simple config.json file
• Command-line flags for ad-hoc overrides

Requirements

1. Google API OAuth Client

   • You must create a Google API OAuth client with the Google Calendar API enabled.
   • Go to Google Cloud Console
   • Navigate to APIs & Services → Library → Google Calendar API → Enable
   • Download your OAuth client credentials as credentials.json and place it in the project directory.

2. First Run Authorization

   • On the first run, the app will open a loopback browser window to authorize your OAuth client with your Google account.
   • This will generate a token.json file for future runs.

3. LIFX Bulb and Developer Token

   • You need a LIFX smart bulb.
   • Obtain a developer token by following instructions at: LIFX API Authentication
   • Place your token in the config.json file under the lifx_token field.

4. Configuration

   • Update config.json with all required settings:
     • credentials: Path to your Google OAuth client JSON file
     • token: Path to your Google OAuth token file
     • calendar: Your Google Calendar ID (or primary for your main calendar)
     • days: How many days ahead to check for events
     • lifx_token: Your LIFX API token
     • lifx_light_id: The ID of the LIFX bulb to control
     • lifx_light_label: The label of the LIFX bulb to control
     • lifx_busy_color: The color to set when busy (e.g., "red saturation:0.8")
     • lifx_free_color: The color to set when free (e.g., "kelvin:3500")
     • reload_interval_seconds: How often to reload the calendar schedule (in seconds)

   Example config.json:

   {
     "credentials": "path_to_oauth_credentials.json",
     "token": "path_to_oauth_token.json",
     "calendar": "your_calendar@gmail.com",
     "days": 7,
     "lifx_token": "YOUR_LIFX_API_TOKEN_HERE",
     "lifx_light_id": "YOUR_LIFX_LIGHT_ID_HERE",
     "lifx_light_label": "YOUR_LIFX_LIGHT_LABEL_HERE",
     "lifx_busy_color": "red saturation:0.8",
     "lifx_free_color": "kelvin:3500",
     "reload_interval_seconds": 120
   }

Usage

go run main.go

You can override config values with command-line flags for ad-hoc things like this:

go run main.go -calendar="your_calendar_id" -lifx_token="your_token_here" -lifx_busy_color="blue saturation:1.0" -reload_interval_seconds=300

Notes

• Make sure your LIFX bulb is online and connected to your account.
• The utility will continuously monitor your calendar and update the bulb state in real time.
• Keep your API tokens secure and do not share them publicly.