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

Adapter 9v 2A for Arduino
1 × 29 SAR
Case for Raspberry pi 4 non-acrylic ABS with Place for Fan
1 × 35 SAR
ATmega328 Mircocontroller
1 × 29 SAR Subtotal: 93 SAR
Adapter 9v 2A for Arduino
1 × 29 SAR
Case for Raspberry pi 4 non-acrylic ABS with Place for Fan
1 × 35 SAR
ATmega328 Mircocontroller
1 × 29 SAR Subtotal: 93 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