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

Relay 12V 5A 8PIN SONGLE SMI-12VDC-SL-2C-8pin
1 × 12 SAR
Transistor Kit 17 Value 170pcs
1 × 81 SAR
Advanced Kit for Arduino UNO Pojects
1 × 569 SAR Subtotal: 662 SAR
Relay 12V 5A 8PIN SONGLE SMI-12VDC-SL-2C-8pin
1 × 12 SAR
Transistor Kit 17 Value 170pcs
1 × 81 SAR
Advanced Kit for Arduino UNO Pojects
1 × 569 SAR Subtotal: 662 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