After many months (and quite the journey!), I’ve managed to get my hands on three IKEA Alpstuga devices for review. I’ve heard a lot about these - and had a lot of requests to review them - so I am very excited to see how they perform.
I’m not able to test them in-depth yet, but I’ve had them set up in my hotel room for a few days and they look to be quite consistent in PM readings (at least at low concentrations). However, I have noticed quite a bit of fluctuation when it comes to CO2 readings - last night they read 491, 512 and 584 ppm despite being exposed to the exact same conditions. At other times, the measurements are reproducible (as shown below).
I’m looking forward to getting home and getting these connected for more in-depth testing. In the meantime, if you have any questions or experiences to share, please let us know!
Thanks. Nice! Will be interesting. I’ve used the Sensirion 6x series in a few other projects including trying out a number of methods to keep them calibrated. IIRC, the IKEA Alpstuga is based on the Sensirion SEN63C model.
Yes, I believe it is the SEN63C model. Which models have you been using and what have your thoughts been so far? Due to the use of the use of the optical sensor, the SEN66 looks to be quite a well-rounded sensor.
Unfortunately, it’s not looking too promising so far. While I am awaiting a Raspberry Pi so I can better compare data from the devices historical data on Home Assistant, just glancing at them a few times every day tells me that they have very low reproducibility.
Here are readings from my three devices at two different times. While it appears that the middle one might have been calibrated differently, they’ve all been running for the exact same length of time in the same conditions. Furthermore, the middle one now reads similarly to the one on the right, and the left-most Alpstuga has begun reading 20-40% lower than the other two. They seem to randomly jump around, and they often exceed the ± (100 ppm + 10% of reading) accuracy specification the sensors have.
Right now, my right-most sensor is showing 837 ppm, the centre shows 1123 ppm and the right shows 1089 ppm. Unfortunately, it’s quite hard to get images of all three devices - the images tend to come out like this:
