@TVK
This device is called a personal weather station (PWS). It is already possible to add the data from a personal weather station on Windy.
https://community.windy.com/topic/8182/add-your-personal-weather-station-on-windy
But these data are NOT used for the weather forecasts that you get on Windy. These predictions are done exclusively by the meteorological centers which run and update the weather models and that Windy visualize only. So PWS don’t bring better accuracy to Windy.