Sweet home Scala 3

on YouTube ↗43m

" summary

Built a small production-ish automation engine that runs on a Raspberry Pi and talks to Home Assistant over Scala 3 with Home Assistant via WebSocket JSON. Uses custom typeclass-derived JSON formats (falls back to an unknown event), enqueues messages with monotonically increasing ids to match async responses, and models automations as pure-value triggers/actions with three-state reactions. Replaces Node-RED/Python for the fun of exploring derived JSON formats using Scala 3 typeclass derivation and Tasks/ZIO; demo toggles lights, shows notifications, and works, including a quirky compiler-driven RGB blink.

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" chapters (10)

1. 0:00Start
2. 5:22The Home Assistant
3. 6:31Dashboard
4. 11:35Set Up the Goals
5. 13:35Communicate with Home Assistant
6. 17:37Derived Json Format
7. 21:01Fallback Member Extractor
8. 27:52Triggers
9. 31:15Recap the Automation
10. 38:53Light Notification

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