Water and technology usually don't mix, but for some reason (advertising?), certain brands of faucets feature some little screen that can display things. They appear to almost always run a variant of Linux, with architectures presumed to usually be ARM.

These things run Android, and one can find pics of it online since it’s a faucet. Normally, it runs cancerous advertisements all day, but maybe it could be hacked…

https://vodxs.com/