Mastodawn

in_sympathy Sep 4, 2025

We have frequent issues with centrally supplied hot water, so I made a simple monitor with #ChatGPT and @arduino Nano Matter. It checks if hot water pipe is cold and if so - turns on electrical heater. Otherwise it keeps heater off with #HomeKit (or #HomeAssistant thanks to #Matter).

Takes only 0,07W - will work for weeks on two #18650s 🙌.

Here's a #GitHub link:
https://github.com/in-sympathy/hotWaterMonitor

P.S.: someday I'll get it a proper enclosure, though this looks cool to me as well 😊.

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in_sympathy Sep 21, 2025

@arduino So I played with it for a while on #AppleHome and decided to give #HomeAssistant another try. And I even almost bought a #HomeAssistantYellow.

Luckily I didn't, because, man, it's so overcomplicated... I mean @homeassistant is doing amazing job sorting all the mess, but I couldn't either get #TVOC or #eCO2 displayed from my DIY AQI meter, nor did I manage to automate this water heater. It works well manually, but nothing happens when I run the script... So it's a 4th pause for now...

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in_sympathy

For the time being I'am back to #HomeKit. Because I can ask Siri to do things on my HomePods, I can securely control my home from anywhere without additional costs, it's simple to manage and I just see no benefits for me in Home Assistant as of now. Though I really wanted to.