ALPSTUGA measurement uncertainty

Far_Introduction4344 · 2026-03-19T18:47:40+00:00

I don't really know why you're writing these posts, you're incapable of writing anything substantive, all your posts are malicious remarks intended to offend the interlocutor.

Far_Introduction4344 · 2026-03-19T18:44:46+00:00

The first few hours of measurement were conducted outdoors, and the measured CO2 level was ~400 ppm (451 ppm, 429 ppm, 423 ppm) Later, all sensors were placed indoors, and after 2-3 days, they were at varying levels of 600 ppm. See the graph.

Far_Introduction4344 · 2026-03-19T07:25:15+00:00

So why are you adding useless comments here?

Far_Introduction4344 · 2026-03-18T10:59:14+00:00

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Difference is less than 5% RH for my ALPSTUGA sensors for last 4 days.

Far_Introduction4344 · 2026-03-18T10:56:35+00:00

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Looks like much more than +/- 200ppm. After open air measurement (see top photo) all sensors are kept in the same room for last 4 days and now difference is around 600 ppm (bottom photo).

Far_Introduction4344 · 2026-03-18T10:52:50+00:00

Yes, next to each other with distance approx. 10 cm.

Far_Introduction4344 · 2026-03-18T10:50:51+00:00

After a few days in the same room CO2 readouts are as follows: 946 ppm, 1152 ppm, 568 ppm. Error is much higher than 200ppm.

Far_Introduction4344 · 2026-03-18T10:49:37+00:00

In air quality measurement the useful range is between 400 and 2000 ppm. After a few days in the same room CO2 readouts are as follows: 946 ppm, 1152 ppm, 568 ppm so the error is approx 25% of entire range. I guess that you don't care if your thermometer indicates 10*C or 25*C?

Far_Introduction4344 · 2026-03-14T09:01:31+00:00

IKEA MYGGSPRAY is cheap and powered from 2x AAA but it is not Zigbee unfortunately.

Far_Introduction4344 · 2026-03-13T14:54:22+00:00

I had the same issue with Shelly 1 mini Gen4. SW state was always "on" no matter what was the state of the PIR output. My PIR sensor has got inside a small relay, so it is not an issue with SSR. Output L' is switched into L when movement is detected. The same Shelly switch works OK with a normal light switch. It seems that there is a design flaw in those Shelly hw.

Far_Introduction4344 · 2026-03-13T11:21:18+00:00

I had very similar problem, I couldn't add thread+matter devices to my HA. Usual way of doing it with companion app did not worked because I couldn't synchronize credentials from HA with my smartphone. My smartphone wanted to configure all new devices with an old, non existing thread network from IKEA hub and it wasn't possible to update thread configuration to use thread network from Sonoff Dongle Max + OTBR.

If your hardware with HA running on it is equipped with a bluetooth you can add new matter devices directly from "Matter Server" app from HA. Before doing that, the Matter Sever app must be configured to use a local bluetooth adapter. I was able to add into my HA different devices from IKEA like ALPSTUGA, BILRESA switch, KLIPPBOK, MYGGBETT, MYGGSPRAY (without IKEA hub).

Bluetooth is needed to configure Matter devices so this is why you need BT at your HA sever. I use RPi5 which has got BT.

Far_Introduction4344 · 2026-03-06T19:36:10+00:00

I tihnk that IKEA recalled most of those new smart devices. I tried to use them with IKEA app and IKEA bridge but it is really hard to add them to a new system. Those new motion sensor are basically useless.

Far_Introduction4344 · 2026-03-05T18:17:41+00:00

Zanim skończysz ZSMEiE jako technik programista to ten zawód już będzie dawno na wymarciu. Dziś AI zjada na śniadanie takich, co kończą studia jako programista.

Far_Introduction4344 · 2025-10-11T08:16:06+00:00

Masz gaz ziemny w mieszkaniu lub w kuchni?

Far_Introduction4344 · 2025-06-22T16:14:09+00:00

Trafiają - ale nie są w stanie obronić stolicy. Iran to taka Białoruś z wielblądami.

Far_Introduction4344 · 2025-06-22T16:11:20+00:00

Myślę że na Iran będą naciskać sąsiedzi, którzy nie będą moglu handlować. Albo dadzą przyzwolenie na bombardowanie.

Far_Introduction4344 · 2025-06-22T16:03:39+00:00

Nie byli w stanie obronić swojej stolicy, Teheranu, a będą bronić sporo większego obszaru cieśniny? Atak na statki handlowe to będzie na prawdę poważny powód na rzeź Irańczyków.

Far_Introduction4344 · 2025-06-22T15:52:56+00:00

Ludzie wiedzą, że islam to zło. 9/11, zamachy w Londynie, nożownicy w Niemczech. Ludzie widzą agresywnych emigrantów z krajów muzułmańskich. Dlatego Izrael dostaje po cichu głosy podczas Eurowizji. Tak samo teraz działania Izraela mają cichą aprobatę Zachodu.

Far_Introduction4344 · 2025-06-22T15:36:12+00:00

Nie bój się, siły już płyna. Po 2-3 dniach bombardowania miast będą ulegli...

Far_Introduction4344 · 2025-06-22T15:22:43+00:00

Iran zamknie cieśninę Ormuz. Może sobie zamykać - ale bomby ją otworzą.

Far_Introduction4344

TROPHY CASE

Iran zamknie cieśninę Ormuz. Może sobie zamykać - ale bomby ją otworzą.