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My 3D printer: Prusa i3 MK3S+, completely open-source Firmware and mechanical design. I have made many customization and upgrades over the years. It started as a MK3 model, I upgraded it to MK3S and then MK3S+. Today I could upgrade it to MK3.5 or MK3.9 but I don’t see the necessity at the moment.

This helps me to upgrade and repair many things around the house that would otherwise be expensive to fix or would otherwise get thrown away.

Please note that Home Assistant is officially supported on Raspberry Pi 4 and 5 with 2GB of RAM minimum Raspberry Pi - Home Assistant

If your older rpi is for instance a rpi 3 with 512MB of RAM, I’m not sure it’s going to cut it.