Here I explain better what I would like to do with the Pi.
The Raspberry 3 Pi has Minibian installed and serves as a controller for a robot that needs the Wi-Fi connection to work properly.
Up to now I am using it in my house, so I know exactly the SSID and the password of the network, therefore I have set them as a scheme in the network interfaces file so that the Pi can connect to them after the boot.
The problem is that if I want to use the Raspberry in other places, I need to insert manually the new scheme containing the SSID and the password of the new network. So, what I want to do is that if the Pi doesn't find any known network, it builds its own Wi-Fi network (without being connected to internet), so that I can connect to it saying which is the SSID, I want it to connect to, and the related password.
Is it possible to do? Do you have any suggestions?