Can I Add Additional Sensors to the ObserverIP Module?
Yes, for ObserverIP models:
WS-0800-IP, WS-0900-IP, WS-1200-IP, WS-1201-IP, WS-1400-IP, WS-1401-IP, WS-1600-IP
you can add up to 8 additional thermo-hygrometer sensors (WH31B):
https://www.ambientweather.com/amwh31b.html
You must make sure you are running Firmware Version 4.4.5 or greater: