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this post was submitted on 25 May 2026
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I personally have a handful of pi’s doing things, with plans to get more to do more (I have one in the mail to become my OpenWRT router). I was thinking of getting something simple to be able to do STT and TTS as I want to replace my HomePods as I slowly leave Apple and have have no interest in joining Amazon or Google for home automation, so I looked at my university’s used computers. I am not really a fan of buying some random persons old hardware but maybe a business is selling their old stuff.
I assume you are using pi 4 and/or 5? I would have some 3b+ laying around which don't see any use nowadays. But can't quite imagine to build a cluster only made up of these, I think they are too underpowered, unless being used as like a small additional worker node.
And buying new Pi 5 with 16GB of memory would set me back at least 200€ a unit, not including power supply or any case.
I’m also in the PI 4 group. Its worth watching ebay, etc for people selling pi clusters. I picked up my 8 node 4GB pi cluster fairly cheap.
Also if you’re learning and find yourself struggling with yaml files, I found Claude helped a lot to get running. Create the file, dump it into Claude and let it re-output the file. Give it the error log helps if it gets stuck.
Also if you explain your cluster setup, I built mine with Talos Linux so setup VIP, etc and it’s pretty good at generating a working setup.
I’m not a huge fan of AI but I struggled with yaml formatting so it might suck for a lot of stuff but formatting stuff properly is great.. that and scanning logs for errors! 😎