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Amazon.com: 4-Port Raspberry Pi USB HUB HAT for Raspberry Pi 4B/3B+/3B/2B/B+/A+/Zero/Zero W, 4 USB Ports Compatible with USB2.0/1.1 Onboard USB to UART Onboard Multi Indicators : Electronics
![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://raspberry-pi.fr/wp-content/uploads/2020/07/gpios-diagram-939x528.png)
Activate the TTL serial port of the Raspberry Pi and verify that it is working. – Howto Raspberry Pi
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