Can someone help me out with this project

[vanepp]

Your DRV8833 part is broken. There is a corrected version available here:

Help on creating pololu motor shield drv8833

OK here is a corrected part, you have a lot of things wrong. You started out from an incorrect part, it had schematic subparts (thus no schematic as yours is not properly configured.) I replaced schematic with one generated by the Inkscape extension as being easiest. The connectors should start at 0 not 1, so I corrected that. In pcb the holes were 0.035in (for an IC) rather than 0.038in for a 0.1in header. Corrected that. Ran the part through FritzingCheckPart.py to fix up the font size proble…

so you need to replace that part. There are no connections from the batteries to anywhere (looking in schematic) they connect to each other but nowhere else.

they presumably need to connect to the step down converter which they currently don’t.

Peter