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

NAND Gate 74LS00 IC 7400
1 × 10 SAR
Prototype Shield for Arduino MEGA
1 × 35 SAR Subtotal: 45 SAR
NAND Gate 74LS00 IC 7400
1 × 10 SAR
Prototype Shield for Arduino MEGA
1 × 35 SAR Subtotal: 45 SAR
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