Nice project. But I see a problem with the fuses you used. They seem to be standard 5x20mm and afiak they are only rated for AC. I don't think they can reliably break DC at 400V.

It's a comprehensive design. 

Updated Revision in the works: https://www.elektormagazine.com/labs/remake-elektor-weather-station and yes we added a sd-card option to the station 

Dear all,  the Software gets some fundamental rework as we are working on a updated harware revision. The work done for the last version 1.5 will be included int the software as well so some other nice goddies like sd-card support. We try to get also some new protorcols supported and try to fix some parts that looked not that nice. Further progess will be found here: https://www.elektormagazine.com/labs/remake-elektor-weather-station

Hi, Great box, it looks nice. I looked at your schematics, maybe you could try to study it's loop gain stability and improve it with simulation. https://www.youtube.com/watch?v=fODXWfY1oHE it's a very interesting subject. Best regards