![Raspberry Pi 4 Model B 4 Ports USB HUB HAT for Extension Board USB to UART for Serial Debugging for Raspberry Pi 4 /3B+/Zero W - Newegg.com Raspberry Pi 4 Model B 4 Ports USB HUB HAT for Extension Board USB to UART for Serial Debugging for Raspberry Pi 4 /3B+/Zero W - Newegg.com](https://c1.neweggimages.com/productimage/nb640/AHCVS210523Xq9i7.jpg)
Raspberry Pi 4 Model B 4 Ports USB HUB HAT for Extension Board USB to UART for Serial Debugging for Raspberry Pi 4 /3B+/Zero W - Newegg.com
![4 Ports USB HUB HAT For Raspberry Pi 3 / 2 / Zero W Extension Board USB To UART For Serial Debugging Compatible With USB2.0/1.1 - Walmart.com 4 Ports USB HUB HAT For Raspberry Pi 3 / 2 / Zero W Extension Board USB To UART For Serial Debugging Compatible With USB2.0/1.1 - Walmart.com](https://i5.walmartimages.com/asr/438796b8-953b-4ad6-9fae-45dba00750cd.23e7fbda43b90f42e0e136106a157f8d.jpeg?odnHeight=768&odnWidth=768&odnBg=FFFFFF)
4 Ports USB HUB HAT For Raspberry Pi 3 / 2 / Zero W Extension Board USB To UART For Serial Debugging Compatible With USB2.0/1.1 - Walmart.com
![Activate the TTL serial port of the Raspberry Pi and verify that it is working. – Howto Raspberry Pi Activate the TTL serial port of the Raspberry Pi and verify that it is working. – Howto Raspberry Pi](https://howtoraspberrypi.com/wp-content/uploads/2020/07/raspberry-pi-serial-1-scaled.jpg)