OBC Drone HAT

### DESCRIPTION ( Introduce yourserlf and your project)

Hello, I'm Vladimir Ermakov, one of core developers of MAVLink (now standard defacto telemetry for various drone autopilots) and bridge for Robot Operating System.

I want to make Raspberry Pi B HAT (addon module) that help to connect Pixhawk 2 autopilot with onboard computer. Also suitable for usage at ground station (telemetry and video gateway).

That will be openhardware project, repo: https://github.com/vooon/obc-drone-hat

Currently early WiP, but i think to continue HW design in one or two weeks.

### TECHNICAL DETAILS (With project photos)

- I hope to fit into 2-layer PCB, 65x56.5 HAT format. And place all components on top layer. (should be possible because NET is small)

- Broard should include switching power supply capable to handle 6S LiPo 22.2V nominal (at least 30Vin max) and provide 5V 4A (2.5A reserved for rpi).

- 5V FAN output for controllable cooling FAN

- 2 UART with RTS/CTS DroneCode.org ports

- 1-n I2C ports (suitable for OLED status display)

- 1 port for FrSky XSR receiver (used to bridge taranis with LRS radio).