I want to use Serial and BT same time on RPi 4B (Python) I thought I cannot use it so I attached usb blutooth dongle (CSR4.0?) on it. But I only can find references on the net using default BT when I try to find how to use BT function,

I found some hint on another question. (How to use serial and bluetooth at the same time ) but I cannot understand all how-to.

My question is 1) How can I do, if I want to use external BT dongle except from on-board one. (final goal is controlling by python)

2) Could somebody kindly help me to understand previous solution? ( How to use serial and bluetooth at the same time ) especially How to setup the pins... Or at least some article to understand the solution.

Thank you very much in advance.

  • The Answer linked is incorrect - at best it is a mis-interpretation of the situation. I use both regularly.
    – Milliways
    Apr 9, 2020 at 3:05

1 Answer 1


See How do I make serial work on the Raspberry Pi3 or later for an explanation.

The Pi4 has 4 additional UART which can be used for more demanding uses - See https://raspberrypi.stackexchange.com/a/107780/8697

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