Untill I installed a library, Thermistor_library-master.
From that moment the NodeMCU can no way connect to the internet!!!
I removed the library (deleted the library 's folder from C:\Users\Pan\Documents\Arduino), I tried previous sketches that worked 100% in the past, but NOTHING!
It cannot connect.
I even tried another (unused) NodeMCU and the same thing happens!
I 'm desperate, I don't know what to do!
Any help is welcome.
(I have made no changes to the router 's credentials or any of it 's settings)