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

Linear Magnetic Hall Effect Sensor Module for Arduino
1 × 29 SAR
ATmega328 Mircocontroller
1 × 29 SAR Subtotal: 58 SAR
Linear Magnetic Hall Effect Sensor Module for Arduino
1 × 29 SAR
ATmega328 Mircocontroller
1 × 29 SAR Subtotal: 58 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