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ROBOTIS-GIT / turtlebot3

ROS packages for Turtlebot3
http://turtlebot3.robotis.com
Apache License 2.0
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Existing package error issue due to Python 3 upgrade -> roslaunch turtlebot3_bringup turtlebot3_robot.launch #866

Open 0Roo opened 2 years ago

0Roo commented 2 years ago

ISSUE TEMPLATE ver. 0.4.0

  1. Which TurtleBot3 platform do you use?

    • [ ] Waffle

  2. Which ROS is working with TurtleBot3?

    • [ ] ROS 1 Melodic Morenia

  3. Which SBC(Single Board Computer) is working on TurtleBot3?

    • [ ] Raspberry Pi 3B+

  4. Which OS you installed on SBC?

    • [ ] Ubuntu preinstalled server (18.04/20.04)

  5. Which OS you installed on Remote PC?

    • [ ] Ubuntu 18.04 LTS (Bionic Beaver)

  6. Specify the software and firmware version(Can be found from Bringup messages)

    • Software version: [x.x.x]
    • Firmware version: [x.x.x]

  7. Specify the commands or instructions to reproduce the issue.

    • roslaunch turtlebot3_bringup turtlebot3_robot.launch

  8. Copy and Paste the error messages on terminal.

    • RLException: ERROR: unable to contact ROS master at [http://192.168.0.31:11311] The traceback for the exception was written to the log file

  9. Please describe the issue in detail.

    • To use Python 3, $ sudo apt install python3-pip python3-all-dev python3-rospkg $ sudo apt install ros-melodic-desktop-full --fix-missing Enter to modify the rospkg. Personally written python3 files work well in ros, but when I run the previously given package, I get the above error message. As far as I know, the existing package was written in python 2, is there a way to continue using it? Alternatively, can you tell us an example of the code to control the motor's motion through cmd_veltopic to implement the robot's motion part?
ROBOTIS-Will commented 2 years ago

Your issue unable to contact ROS master doesn't seem to be related to the Python version. Please see below similar issues. https://github.com/ROBOTIS-GIT/turtlebot3/issues?q=unable+to+contact+ROS+master+

Converting cmd_vel to DYNAMIXEL command can be found from OpenCR TurtleBot3 firmware https://github.com/ROBOTIS-GIT/OpenCR/blob/master/arduino/opencr_arduino/opencr/libraries/turtlebot3/examples/turtlebot3_waffle/turtlebot3_core/turtlebot3_core.ino#L165 https://github.com/ROBOTIS-GIT/OpenCR/blob/master/arduino/opencr_arduino/opencr/libraries/turtlebot3/examples/turtlebot3_waffle/turtlebot3_core/turtlebot3_core.ino#L803 https://github.com/ROBOTIS-GIT/OpenCR/blob/master/arduino/opencr_arduino/opencr/libraries/turtlebot3/examples/turtlebot3_waffle/turtlebot3_core/turtlebot3_core.ino#L90