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 × 68SARSubtotal: 97SAR
ATmega328 Mircocontroller 1 × 29SAR
Data Logging Shield SD card shield XD_204 1 × 68SARSubtotal: 97SAR
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