USB shield – usb host shield
if you will not use External Power please be sure this jumpers are soldered as below :

so after soldering it will be like this image

BlueTooth Module HC-06 1 × 40SAR
CNC Shield Expansion Board + 4 DRV8825 1 × 183SAR
Pro Mini Board for Arduino Projects-Atmega168 5v 1 × 69SARSubtotal: 292SAR
BlueTooth Module HC-06 1 × 40SAR
CNC Shield Expansion Board + 4 DRV8825 1 × 183SAR
Pro Mini Board for Arduino Projects-Atmega168 5v 1 × 69SARSubtotal: 292SAR
if you will not use External Power please be sure this jumpers are soldered as below :

so after soldering it will be like this image

All Electronics Components
All Electronics Components
All Electronics Components
All Electronics Components
All Electronics Components
All Electronics Components
All Electronics Components
All Electronics Components