> Can you elaborate on how you use the zero?

Mostly around debugging and troubleshooting networking (WiFi+Zigbee network) at home, which the Zero is nice for this as it's easy to bring with me to any area in the house/yard and test stuff wherever. I used to use a laptop+radio for this, but I no longer have any laptops and the Zero does the trick nicely enough.

I also tend (try) to duplicate any keyfobs/cards I come across too, as backups, which helped me just the other day as we've lost the card we got for the municipal trash, so now I'm using the Zero to unlock them as we still haven't recovered that card.

Some months ago I used it for moving a bunch of AC+IR remotes to be connected to my Home Assistant installation by first reverse-engineering the IR protocol then building my own hardware for it with a little IR transmitter, now I can remotely control the old AC unit regardless of where I am in the house. I'm pretty sure it's a fairly standard protocol I didn't need to reverse-engineer myself, probably well documented on the internet already, but way more fun to do so yourself.

I'm in a similar boat. I'm not passionate enough about technology with the Flipper Zero. Don't get me wrong, really cool device but I've pretty much just used it as a toy to play snake on and a universal remote. If it just had a 3.5mm jack, I would use it as an MP3 player as well.

Mine is mostly just lying around but sometimes I find some use for it. This winter I bought some remote controlled electricity sockets that at first didn't seem to work so then I got the Flipper and started recording radio to figure out what was happening. Turns out the remote was some cheap hardware that at first broadcast promiscously and to the sockets entirely unintelligibly but with time and trying it stabilised.

If I didn't have the Flipper or some other SDR device I'd probably have assumed it was bad and left it at the recycling station. If I'd lose the original remote I can use the recordings on the Flipper to either control the sockets or create a new remote.

I've also looked into how the key fob to my car works and investigated tens of RFID and NFC cards, some of which I could probably have talked to with my phone but I like the format of the Flipper and it has very few distractions except Snake.

When traveling I sometimes bring it up just to check out what radio stuff I can find and think about what devices might be sending.