I think it is worth further discussing the original intent of this thread. I came into the conversation only to say yes it is possible to reassign an extra sensor as the main outdoor sensor (with a MB). But just because you can does not mean it is the best solution. I can see some drawbacks in doing this with a Meteobridge that allows this....
Namely the solution requires one of two solutions as johnd and I have proposed.
- Meteobridge feeding off WLL data on the local network.
- Meteobridge Pro Red working by itself getting data via RF directly from sensor transmitters.
The drawbacks I see of a reassigned sensor to be the main are the following:
- Using Meteobridge Pro Red and campuring data via RF means you can't calibrate the temperature. Currently a limitation that might go away if the Meteobridge software gets this feature added.
- Using only Meteobridge Pro Red (without WLL) means not being able to send data to Weatherlink.com.
- using WLL with a Meteobridge lets you send to Weatherlink.com and CWOP directly and change the default sensor for CWOP and lets you calibrate the sensor via the WLL before the Meteobridge gets the data. BUT this means that your CWOP temperature will be different from your Weatherlink.com data because the WLL continues to report to Weatherlink.com on the default temperature sensor and extra sensors are just that extra sensors.
It is because of this last bullet point that I question even doing this in the first place. I've never seen an install where the ISS temperature is insufficient to be considered good enough to be the default outdoor temperature. You can separate the temperature radiation shield from the ISS and it provides some cabled extention capability. As johnd mentioned you can even get a longer cable version to connect to the ISS and it stays as the default ISS sensor. I think either of these solutions is the best approach rather than messing with default sensors on the Meteobridge.
I'm not trying to talk you out of Meteobridge. Having a Meteobridge gives you a lot of benefits like improving data upload capability to Weather Underground with just seconds of live data upload. You can send data to CWOP directly every 5 minutes instead of being limited 15 minutes via Weatherlink.com. A Meteobridge also let's you upload to a bunch of other online services to name just a few: PWSweather, WeatherCloud, Metoffice, AWEKAS....and many others. And you can upload to your own personal web site.
But Meteobridge is not the only option to gain all those upload capabilities. You can also run the following software that will all get data from the WLL. These are Cumulus, Weather-Display, and WeeWx. You can run anyone or all of them on Windows, MacOS, or Linux (which can be a Raspberry Pi).