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.