Half-DIY temperature and humidity sensor

Hello,

I would like to have temperature and humidity sensors in every of my rooms.
Now, I could simply buy those cheap home weather stations with a few remote sensor units and call it a day, but that would be boring. Also, those weather stations only store min and max values for a limited time window (last 24h I guess).

My end goal is to have Gauge and Graph panels for every room inside a single Grafana dashboard with the data coming from Prometheus. So I would have a central Prometheus server running inside my home network that would somehow collect the data. InfluxDB would also be nice and would probably be better for long term storage (but the DB is not the problem here).

I would be totally fine to put a Raspberry Pi inside each room but I don’t like the sensor solutions I have seen so far. From what I have seen, one needs to connect them via jumper cables to the GPIO pins and end up with a horrible looking mess.

Are there sensors with better integration (USB) or simple heads I can put on the RPI?

I wouldn’t even mind going with a proprietary solution, as long as it gives me a reasonable way to access the data and do with it whatever I want.

Any recommendations appreciated.

Thanks!

Phillipp