Earlier this year I put up a Raspberry Pi powered DAKboard display. It shows photos from our Google Photos albums, the time and weather, and most importantly; our shared calendar.

But I’d like it to show some custom data as well — like indoor temperature and humidity. And the measured outdoor temperature, not just the one reported from the weather service.

Here is how I did that — using Home Assistant 👇

I recently watched Jeff Gerling’s video on CO₂ levels, and how to monitor it. My home office is also in the basement, with no windows. So I paid attention to the air quality when setting up down here.

In addition to monitoring the CO₂ level, I’m also automatically ventilating the space when the air quality gets too bad.

I made a simple HAT (Hardware Attached on Top) for the Raspberry Pi to read multiple DS18B20 temperature sensors — it was surprisingly easy. I used the measured temperatures to control a fan using Home Assistant.