Best way with X2 with adaptor and Raspberry Pi4 with ubuntu to run python sample.

[halcyon1945]

In my case.

• Allow serial port to user.
  https://askubuntu.com/questions/207999/how-to-add-dialup-group

Or do this script manually.
https://github.com/YDLIDAR/YDLidar-SDK/tree/master/startup
it change user group.(lack of this step at install doc?)

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• Change port
  

  YDLidar-SDK/python/examples/plot_ydlidar_test.py

  Line 20 in 5c1a1aa

  port = "/dev/ydlidar";

  
  change to /dev/ttyUSB0

Or do this script manually.
https://github.com/YDLIDAR/YDLidar-SDK/tree/master/startup
/dev/ttyUSB0 treat as /dev/ydlidar

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• Change baundrate
  

  YDLidar-SDK/python/examples/plot_ydlidar_test.py

  Line 26 in 5c1a1aa

  laser.setlidaropt(ydlidar.LidarPropSerialBaudrate, 230400)

230400 -> 115200

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• Change signal channel receive only
  X2 is sending signal only. no command receive.
  

  YDLidar-SDK/python/examples/plot_ydlidar_test.py

  Line 31 in 5c1a1aa

  laser.setlidaropt(ydlidar.LidarPropSingleChannel, False);

False -> True

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• Use USB3.0(blue) port
  2.0 port makes often disconnect.

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• Use external power supply
  1.0A or higher is required.
  you should use it because unidentified issues will occur.

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• it may made with older matplotlib version ( <3.6)
  i comment out this line.
  

  YDLidar-SDK/python/examples/plot_ydlidar_test.py

  Line 14 in 5c1a1aa

  fig.canvas.set_window_title('YDLidar LIDAR Monitor')

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• Remove brltty (if exist)
  check Port log with dmesg and it seems brltty disturb it. remove brltty.

sudo dmesg
sudo apt remove brltty -y

https://stackoverflow.com/questions/5213723/usb-serial-loses-connection-immediately-in-new-linux-kernel-4-12-14

Run the binary immediately, as it will only be recognized for a few seconds after you set USB connector.
If it starts spinning at high speed, communication is broken. re-connect it.
it may occur under brltty disturbed condition.

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thank you for interesting product