Using IKEA pm2.5 Air Quality Sensors in Home Assistant

I’ve been doing research on making some custom air quality sensors for inside and outside my house. The laser cutter is a main focus point for these as it would be nice to know how it affects air quality (and in the future, maybe activate an air filter based off the sensors readings). When I found out IKEA makes some simple air quality sensors that can be easily hacked using an ESP device, I decided to try it out.

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Using Z-Wave Groups vs Home Assistant Automations

I installed two Z-wave switches into my house that i wanted to be synchronized, turn on one light switch, have the other turn on too, and vice versa. I first created a home assistant automation that worked using Z-Wave JS to MQTT, this worked but had a lag of a few seconds. I was hoping to find a way to have less latency to make everything work, so in comes Z-Wave Group Associations.

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Joplin Failed to Fetch Due to Certificate Expiration

Recently I ran into an error when trying to update Joplin (hooked up to WebDAV on NextCloud).

Last error: FetchError: request to failed, reason: certificate has expired

I checked the SSL cert with FireFox and everything looked good there. Finally I decided to try updating the application, on a wild attempt to fix it in a simple way, and… it worked. It might have just needed a reboot, but the update worked in this case.

The VLANs Strike Back

I recently re-did my entire network, changing out switch locations, what ports were plugged into where, and so on. This wasn’t too bad, except I didn’t make note of one thing: which ports were VLAN tagged. This became quite the struggle as I tried to figure out why my WiFi couldn’t access the internet, and why all my servers were inaccessible. I even changed what port the Unifi AP was plugged into to try and kick that VLAN possibility out of the running. Little did I know that BOTH ports I tried to plug the AP into were tagged, so neither could reach the internet. I ended up plugging my RT-N16 back into the modem to see that I had internet, and then moved the switch port the access point was into one more time to find a port that wasn’t tagged. Once I had that, I swapped what port my servers were plugged into to find a non-tagged port, that would get my Unifi controller back up so I could go and clean up the rest and get things back into an operational state.

TLDR: Label or remove VLANs before re-architecting things