Gary Servin's profile - activity

I've tried running this and it works fine on my machine running 16.04 and kinetic. Here's the test code I'm using to tes

Are you using C++ or Python for your subscriber code? If C++, do you have a ros::spinOnce(); that is called periodically

The tum_simulator package has not been actively maintained for a long time. Thankfully someone has already ported it to

One option would be to run some kind on visual odometry like viso2

You don't really have an easy way to get odometry directly from the IMU, since you will need to integrate the accelerati

If you're using gazebo, you can subscribe to the /gazebo/model_states topic and compare it to the output of amcl. You ca

You can add it to your original post, there is an icon (with 1 and 0s) to format the code

Can you share the part of the code that reads the encoder? Are you using any example code? Without that it would be a bi

Hi,

Is there a way to avoid overwriting parameters when being loaded from a launchfile using a YAML file?

For example, I have two YAML files like the following:

config1.yaml

topics:
  - topic: topic1
    type: geometry_msgs/Twist
  - topic: topic2
    type: std_msgs/Empty

config2.yaml

topics:
  - topic: topic3
    type: geometry_msgs/Twist
  - topic: topic4
    type: std_msgs/Empty

and want to have the 4 topics loaded under the topics parameter.

I know that namespacing is the way it's normally done to separate parameters with the same name, but I'm looking for some other way.

Thanks!

Fixed the link

You can do it, but it is very impractical. Take a look at this tutorial for a cpp example. Also, for python you can jus

Currently we don't support using PkgConfig with the ROS NDK, you will need to use a workaround to specify the correct variables for the library you need to use (in this case libusb). Here's an example on how we do that for another package.

Hi! Are you sure the serial port is ttyACM0 for the Gecko? Also, the default speed is 57600 (see line 17 in here) or did you change it on the example code?

Can you share how you solved it? thanks!

Are you still having this issue? are you using rosserial_mbed from debians or did you install it via sources?

This error was due to a name change on the tf2 package and it has been fixed here.

You need to pull the changes from the repo, run: sudo rm -r output/catkin_ws to delete the workspace and run the do_docker.sh script again.

You can use the atmega microconteoller alone (without using any of the Arduino libraries) using this example.

If you want to use a PIC32, which AFAIK doesn't have a ROS library yet, you can use something like the serial package from wjwwood on the host and write your own protocol and serial parser on the PIC32.

Here's a simple example of how to use the serial package to communicate with an arduino, but without using the rosserial_arduino library. It should be easy to replicate this on the PIC32.

Sorry for the delay, I've just seen this.

We've already fixed that issue (here), it turns out, console_bridge move from using boost to using std C++11 mutex which is not currently available for the android_ndk.

If you update the repository, it should work.

first of all, does your user have permissions to access the serial port?

second, ros_time is of type 'rospy.rostime.Time' so you can't write that directly to the serial port, you should do something like ros_time = ser.write(str(ros_time)) to send the time.

If you have mbed support for your board, you can use rosserial_mbed

What I did was create two different husky.gazebo.xacro files and hard-code the robotNamespace for each robot there. And on the description.gazebo.xacro included each of those files depending on a namespace arg like: <xacro:include filename="/home/gary/$(arg namespace).gazebo.xacro"/>

Yeah, that's the tricky part. You can pass arguments to a xacro file and use the arg to set the robotNamespace tag. The problem is that you can't pass an arg from a xacro file to an <xacro:include as stated here.

Each controller is running in a single namespace (see here), so you will need to adjust that. You will also need to configure the namespace for the imu and for the gps.

You need to also modify the -model parameter in spawn_husky_model or both robots will get an error.

here's a screenshot of the two huskies moving independently after applying the modifications

can you try disconnecting the servos and running the serial node again? If it works without the servo, then it should be a problem related with the power supply, the regulator on the arduino can't provide enough current to the servo and it resets the arduino when you try to move the motor

does your user have permission to access the serial port?

did you try specifying the port to use?

rosrun rosserial_python serial_node.py /dev/ttyUSB0

or

rosrun rosserial_python serial_node.py /dev/ttyACM0

I'd suggest you go with 14.04 since is the current Long Term Support. For ROS you can go either with Indigo or Jade for the 14.04 release.

There's no off the shelf solution, you will need to create a node that subscribes to /tf in each of the robot's masters, apply the prefix to each of the transformations needed and re-publishes on a "common" tf topic you chose.

You will need to use something like multimaster_fkie or rocon_multimaster and namespace each of your robots. You can take a look at this answer about the namespacing.

did you try the code without the ROS part? so you can confirm that the arduino is in fact communicating with the IMU.

did you uncomment the following line? https://github.com/uos/sick_tim/blob/... . Also you need to make your document public so we can see it.

did you install the image_view package?

sudo apt-get install ros-indigo-image-view

I've upload my rosndk image for now, can you try using it instead of building? https://hub.docker.com/r/garyservin/r...

It seems it failed to install correctly the Android SDK inside the container, thus the "SDK target: lib_target_sdk_target-NOTFOUND".

Can you manually install the SDK again inside the container? Here are the instructions: https://gist.github.com/garyservin/34...

It seems like opencv is failing to build, I just cleaned my workspace and started a new do_docker from scratch to see if I can reproduce this issue. I'll let you know.

hi,I'm trying to build native ROS nodes using the Android NDK by this tutorial[http://wiki.ros.org/android_ndk/Tutorials/BuildingNativeROSPackages]. I use Ubuntu 64bit 14.04LTS as the host on the VM. I installed docker by step 1 and step 2 successfully and run ./do_docker.sh cmd,then something goes wrong with this:

[ 84%] Building CXX object modules/ts/CMakeFiles/opencv_ts.dir/src/ts.cpp.o
Linking CXX static library ../../lib/libopencv_ts.a
[ 84%] Built target opencv_ts
[ 84%] Generating OpenCV Android library project. SDK target: lib_target_sdk_target-NOTFOUND
make[2]: *** [build.xml] Error 1
make[1]: *** [modules/java/CMakeFiles/opencv_java.dir/all] Error 2
make: *** [all] Error 2
Cross-compiling ROS.
Running catkin_make.
Base path: /opt/roscpp_output/catkin_ws
Source space: /opt/roscpp_output/catkin_ws/src
Build space: /opt/roscpp_output/catkin_ws/build
Devel space: /opt/roscpp_output/catkin_ws/devel
Install space: /opt/roscpp_output/target

Then the cmake comeout some errors :

CMake Error at catkin/cmake/catkin_workspace.cmake:95 (message):
  This workspace contains non-catkin packages in it, and catkin cannot build
  a non-homogeneous workspace without isolation.  Try the
  'catkin_make_isolated' command instead.
Call Stack (most recent call first):
  CMakeLists.txt:63 (catkin_workspace)


-- Configuring incomplete, errors occurred!
See also "/opt/roscpp_output/catkin_ws/build/CMakeFiles/CMakeOutput.log".
See also "/opt/roscpp_output/catkin_ws/build/CMakeFiles/CMakeError.log".
Invoking "cmake" failed

Installing.

make: *** No rule to make target `install'.  Stop.
build_cpp.sh /opt/roscpp_output died with error code 2

Creating output/roscpp_android_ndk.tar.gz.

tar: roscpp_android_ndk: Cannot stat: No such file or directory
tar: Exiting with failure status due to previous errors

the CMakeError.log shows like :

CheckIncludeFile.c:1:22: fatal error: execinfo.h: No such file or directory
compilation terminated.
make[1]: Leaving directory `/opt/roscpp_output/catkin_ws/build/CMakeFiles/CMakeTmp'
make[1]: *** [CMakeFiles/cmTryCompileExec2484976465.dir/CheckIncludeFile.c.o] Error 1
make: *** [cmTryCompileExec2484976465/fast] Error 2

and 


/opt/roscpp_output/catkin_ws/build/CMakeFiles/CMakeTmp/src.cxx:2:8: error: expected constructor, destructor, or type conversion before '(' token
make[1]: Leaving directory `/opt/roscpp_output/catkin_ws/build/CMakeFiles/CMakeTmp'
make[1]: *** [CMakeFiles/cmTryCompileExec640946834.dir/src.cxx.o] Error 1
make: *** [cmTryCompileExec640946834/fast] Error 2


main:CheckFunctionExists.c(.text.main+0x14): error: undefined reference to 'backtrace'
collect2: ld returned 1 exit status
make[1]: Leaving directory `/opt/roscpp_output/catkin_ws/build/CMakeFiles/CMakeTmp'
make[1]: *** [cmTryCompileExec4272716319] Error 1
make: *** [cmTryCompileExec4272716319/fast] Error 2

I don't know if the cmake errors come from the opencv errors. Any one Know something about this problem?Thanks a lot!

You can use something like https://github.com/wjwwood/serial/ .

Here is a simple example of how to use it to communicate with arduino (without using rosserial_arduino)

I don't think we have enough information to help you based solely on this. Can you edit your question and add the code (or the relevant part of it) you're using? Maybe permissions issue?

take a look at the rosserial_windows package