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Dear Sir, I follow the link: http://wiki.ros.org/rosserial_arduino/Tutorials/Arduino%20IDE%20Setup You can install rosserial for Arduino by running: sudo apt-get install ros-indigo-rosserial-arduino sudo apt-get install ros-indigo-rosserial and then: cd <ws>/src git clone https://github.com/ros-drivers/rosserial.git cd <ws> catkin_make catkin_make install and when test helloworld, see the same error message: [ERROR] [WallTime: 1461904599.861522] Unable to sync with device; possible link problem or link software version mismatch such as hydro rosserial_python with groovy Arduino I follow the answer in this thread to download indigo zip file. remove the old source, rebuild the new source, and rm ros_lib and run: cd <sketchbook>/libraries rm -rf ros_lib rosrun rosserial_arduino make_libraries.py . But I still see the same errors: [ERROR] [WallTime: 1461904599.861522] Unable to sync with device; possible link problem or link software version mismatch such as hydro rosserial_python with groovy Arduino How do we claern the old libaray. I had redo start from reinstall ros-indigo-rosserial-arduino, the result is the same.

I use arduino Yun, when I complier and upload the image, I get warning: Low memory available, stability problems may occur.

I don't know the issue is I did not clean it, or the issue is the system did not stable? Could somebody help to answer? Thank you very much! John