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

ATmega328 Mircocontroller 1 × 29SAR
Data Logging Shield SD card shield XD_204 1 × 68SAR
MEGA Board for Arduino Mega 2560 Projects 1 × 135SARSubtotal: 232SAR
ATmega328 Mircocontroller 1 × 29SAR
Data Logging Shield SD card shield XD_204 1 × 68SAR
MEGA Board for Arduino Mega 2560 Projects 1 × 135SARSubtotal: 232SAR
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