What bus for temp and relative humidity sensors in a building.

[Swake]

I would like to install lots of temperature and relative humidity sensors in a building. With central monitoring and logging. About 40 sensors in total. This number will probably grow over time. Later on I would also integrate some other sensors as well (pressure; light; CO2; presence;...)

2 or more sensors might be installed in the same location.

What is the best system/bus for this application?

I was thinking about one-wire, cheap and easy for temp logging (DS18B20), but I could not find something for relative humidity, probably didn't search far enough yet.

Central unit will be a raspberry Pi or similar. With main function logging and communication/reporting.

Thanks in advance for the help.

[Simon]

What busses do you have an an option on the raspberry pi and what busses can the sensors work on ? Alternatively if it's a lot of cabling and you can't get sensors to matcj the raspberry pi anyway you will probably be best to have a uC hub connected the the rasbery pi via something like USB to talk to all of the sensors via a small uC interface board.