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Uart for Orange PI 4B


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Hi all,


I have an Armbian installed on Orange PI 4B.  I am trying to connect a flight controller to Orange PI 4B by using UART port.


This board has a 40 pin header.


I went to armbian-config, and enabled the UART1 and UART 4 which are available from armbian-config.  


I plug the UART port (to Pin 8  and pin 10) on the 40 pin header.  Is that port UART 4? I am not sure.   It does not work.  I tried the debug port, but the Orange PI does not start up if something is plugged in to the debug UART port.


The PIN layout



The layout of the board is similiar to Orange PI One.  I know the 5 V location by using the case fan.



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