elephantrobotics/mycobot_ros

Connecting to real robot

saratrajput opened this issue · 4 comments

saratrajput commented

Hello. This might sound like a naive question but I'm not able to figure this out from the documentation.

I have a myCobot-pi model and it has ROS-Kinetic pre-installed on it.

When I run:
rosrun mycobot_ros slider_control.py

I get the error: unable to connect to "/dev/ttyUSB0"

My question is if I'm running ROS on the robot's RPi, do I need to specify the port?

Secondly, if I'm running ROS core on my laptop instead, don't I just need to specify the IP address of the ROS core machine for the robot's nodes on the RPi? Why do I need to connect with a USB cable?

Please let me know if I'm missing something or point me to some good documentation.

Eheech commented

Have you tried ' /dev/ttyAMA0 ' ?

Eheech commented

My question is if I'm running ROS on the robot's RPi, do I need to specify the port?
Re : Have to specify the port if you want to connect the machine

Secondly, if I'm running ROS core on my laptop instead, don't I just need to specify the IP address of the ROS core machine for the robot's nodes on the RPi? Why do I need to connect with a USB cable?
Re : Just specify the IP cannot connect the machine, just able to connect raspberry system

Eheech commented

Also, you can tried ' sudo chmod 777 /dev/ttyUSB* ' , hope this command would help you.

blcuwc commented

Hello. This might sound like a naive question but I'm not able to figure this out from the documentation.

I have a myCobot-pi model and it has ROS-Kinetic pre-installed on it.

When I run: rosrun mycobot_ros slider_control.py

I get the error: unable to connect to "/dev/ttyUSB0"

My question is if I'm running ROS on the robot's RPi, do I need to specify the port?

Secondly, if I'm running ROS core on my laptop instead, don't I just need to specify the IP address of the ROS core machine for the robot's nodes on the RPi? Why do I need to connect with a USB cable?

Please let me know if I'm missing something or point me to some good documentation.

Please make sure that you follow the tutorial correcttly : https://www.elephantrobotics.com/docs/myCobot-en/3-development/4-ros&moveit/

These two commands should be executed in independent terminal windows before you run the rosrun command:

roscore and roslaunch mycobot_ros mycobot_slider.launch

Then run the rosrun mycobot_ros slider_control.py command in another terminal window.

Also you should check the connection between your laptop and the mycobot RPi, make sure the ports and the cable are in good condition.

As for the IP address, because of the serial interface is used in the connection between the laptop and robot, specifying the IP address is not necessary to the recognition and doesn't make sense.

Hope your problem has been addressed.