One more of the targeted features is now done and working: The USB connectors.

I used a configuration which should allow android systems to charge with a higher then standard current (up to 2.1 A depending on the cable). This means D- and D+ are shorted and on a voltage of 1.2 V (10k and 33k resistors).

On the inside I used a USB cable usually used in PCs. Since these are meant to be mounted on thin metal, i had to drill a pretty large holes so that the USB cables fit. I 3D printed two plates to close the holes.

The DC/DC is mounted next to the rest of the electronics, shown in the picture below.