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Comment by lucubratory | Hacker News Reader

I strongly recommend the Aranet4 Home for personal/home use. Very accurate, very long-lasting, tells you other things like humidity etc, and only 1-2 hundred dollars when we bought it (may be more expensive now, been a couple years of inflation).

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I chose the AirGradient[0] One. It's slightly more expensive than the aranet4, but has more sensors. It's open source, reports CO2, PM10, PM2.5, temperature, humidity, and more I'm probably forgetting offhand. Loaded it with the esphome firmware, so Home assistant integration is seamless.

And since it's open source, when a sensor inevitably wears out in a couple years (like the PMS5003), I can just replace the sensor instead of of buying a whole new unit.

Highly recommend it.

[0] https://www.airgradient.com/

Edit: I completely missed that AirGradient blog article

That sounds fantastic, I really love open source stuff.

It's crazy how optimized the Aranet 4 Home is. It runs on AA batteries for a whole year, no need to plug it in.

That's unique in the space, and a case where e-ink makes a real difference. And very convenient in practice.

Also love my aranet4. Would be killer if there was a zigbee version to couple to home assistant. I’d put one in every room if that was the case.

If your Home Assistant has Bluetooth, and the Aranet4 has the "smart home" integration enabled (via the app settings), then HA will pick up ambient broadcasts of the sensors out of the box. You don't need Zigbee or explicit pairing.

But I don’t have a large enough BT “network”, my zigbee networks spans my house (and entire premise).

I bought one a year ago for 200 bucks. I'm still happy with the purchase, and I haven't had to change the batteries yet.

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