PCB with M.2 socket

[dridri]

I'm now working on a new version of the PCB including a M.2 key-B socket, this will help extending the hardware with a custom PCB without altering the base one.

The socket pinout will not be 100% compliant with the official interface definition. It will expose :

• PCI Express 1x
• USB 2.0
• I²C port 1 (shared with the ADC and altimeter)
• bunch of GPIOs

The current first goal is to connect a Coral card like this one : https://github.com/will127534/Coral-USB3-M2-Module/tree/main (after changing key-M to key-B, and probably exposing the other USB3 ports). This would allow to make realtime NN image recognition for autonomous flight.