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 https://nextcloud.rapternet.us/remote.php/dav/files/sbachhub/Documents/Joplin/info.json 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.

Motion Sensing Lights with Home Assistant

I’ve already setup some fairy lights on the stairs which come on just before sundown and stay on until bedtime, but I started wondering, can I use them as night lights on the stairs for when I don’t want to turn on the main overheads, and can I do that all with motion sensors. For this project, I’d like to take my lights from here and add motion sensors so they turn on for some time period after being triggered and act as automated stairway night lights.

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