Home Assistant

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The original was posted on /r/homeassistant by /u/Praline_Choice on 2026-05-19 22:49:17+00:00.

Hey everyone,

I built an open-source ESP32 LED clock ("Led'o'clock") because commercial ones lack proper smart home integrations.

My son's clock has 3 states: 🔴 Sleep 🟠 Play quietly (Time-based trigger) 🟢 Free to leave the room

(Bonus feature: the LEDs can turn off one by one as a time block progresses, acting as a visual countdown: super helpful for bedtime routines!)

In my use case, the transition to green isn't a timer! When his sister wakes up and turns on her bedroom light, an HA automation hits the ESP32 API to instantly turn his clock green. It perfectly syncs their mornings so they don't wake each other up too early.

https://preview.redd.it/ow2hk05b962h1.jpg?width=600&format=pjpg&auto=webp&s=c70dac756a88059797b2ede706915e9bbed97089

https://preview.redd.it/ucgog5si962h1.png?width=775&format=png&auto=webp&s=4404d93ea2846d377ef1f8425b5143a06c467b92

https://preview.redd.it/0sw4n6si962h1.png?width=775&format=png&auto=webp&s=244a301e7c356671cf50f2925222c5db9d8a570d

https://preview.redd.it/9p10e6si962h1.png?width=788&format=png&auto=webp&s=b5ae543f23fc633d8482aac5459ce25c7933aeca

The project (firmware, custom PCB, 3D enclosure) is fully open-source: https://github.com/denouche/led-o-clock

It also features OTA updates, fetching the latest firmware directly from GitHub.

Feel free to build it for yourself, or if you don't have the time and want to get one let me know, I have a few fully assembled units ready to ship!