Here are some pictures of our drone-port. The main purpose of this drone-port is to move the drone - after it lands - to the exact point where the arm can replace the battery. There will be a video tomorrow.
Here is the overall picture of the platform. The arm to replace the battery (and its support) in the left.
The bottom of the platform
Just when the dron lands.
two bars move (thanks to stepper motors) to catch the drone