Hello!
I want to use offboard control, I do not have an odroid or raspberry boards, I am using a ubuntu pc with a long usb cable and I want run the mavros offboard control example code (https://dev.px4.io/en/ros/mavros_offboard.html).
So, I have enable the companion computer interface (SYS_COMPANION TELEM2 to 921600 baudrate).
I am reading this tutorial: Communicating with ODroid via MAVLink — Dev documentation and I am using a USB to Serial interface.
I have a db9 connector and I am connecting Tx , Dx and ground to telem2 pixhawk.
When I run “rosrun mavros mavros_node _fcu_url:=/dev/ttyUSB0:921600”, I can’t start mavros.
What is the problem?
Maybe is my db9?
Do I have to use another interfaces serial ?
Thanks!
Are you using a USB to TTL or USB to RS232?
RS232 has different voltage levels (-15V to 15V), connecting RX and TX from RS232 to the UART on a pixhawk is likely to damage it, you need to use a USB to UART TTL level, best 3.3V.
Compatible USB sdapters are shown in the manual that you are referring to.
Rx line from the adapter goes to a Tx pin on the pixhawk,
Tx line fom the adapter goes to an Rx pin on the pixhawk
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Hello!
I solved the problem, I used USB to UART TTL (xbee usb adapter with 921600 baudrate) and it worked.
Now I can run mavros.
thank you very much! @gregswf
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Hello! @gregswf
I have a question
When I connect my companion computer to pixawk, I can run mavros but I can’t run QGC.
Is it normal that I can not run QGC?
Regards and thanks!
You can not run QGC at all or it runs but does not connect?
I am running QGC in my Ubuntu pc (companion computer)
Does QGC start but it does not connect?
Yes I can run QGC it no connect, maybe I have to check autoconnect options for devices
I think normaly QGC connects to a pixhawk via USB and 115200 baud rate.
You are connected to your Xbee at 921600 baud rate
What if you go to comm links and add a new connection to /dev/ttyUSB0 at 921600?
I’m not sure if you can have your mavros installation and QGC connected to the same port at the same time eather.
When I connect to QGC I am not using mavros, I have never connected to QGC and mavros at the same time
Now I’m getting this message
Is this aftwr adding a new connection?
I have added a new connection but I get the same message
Try different baud rate?
115200?
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