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2016-03-31 19:31:45 -0500 answered a question How to change Robot's initial position in RViZ ?

Hi, Use 2D pose estimate option in Rviz, then drag and drop ur Robot in the initial map .

2016-03-22 12:01:06 -0500 received badge  Popular Question (source)
2016-03-18 06:31:13 -0500 commented question nav2d using Gazebo

Its showing "Prepare Failed"

2016-03-18 02:47:20 -0500 commented answer Rosserial_xbee fails to connect xbees

Problem got solved.. Try to re-configure Xbee and establish connection when its not working.

2016-03-17 22:39:14 -0500 received badge  Supporter (source)
2016-03-17 22:37:10 -0500 commented answer Error connexion Arduino and ROS

Are you using Indigo ROS in ur PC? Check with your distro version and try "sudo apt-get install ros-xxxxx-rosserial " xxxxx --- indigo or hydro based on what you use

2016-03-17 08:41:09 -0500 answered a question Error connexion Arduino and ROS

do "source devel/setup.bash" from your catkin_ws folder level and try.

2016-03-17 05:43:49 -0500 asked a question nav2d using Gazebo

hi,

I am trying to use nav2d using Gazebo.

I am using "https://github.com/skasperski/gazebo_robots" launch file and added rviz.

When I try to set goal in rviz I am getting error as


<launch> <include file="$(find gazebo_ros)/launch/empty_world.launch"> <arg name="world_name" value="$(find scout)/world/willow.world"/> <arg name="paused" value="false"/> <arg name="use_sim_time" value="true"/> <arg name="gui" value="true"/> <arg name="headless" value="false"/> <arg name="debug" value="false"/> </include>

<include file="$(find scout)/launch/scout.launch">
    <arg name="z" value="0.5" />
</include>

<node name="BL_WheelPose" pkg="tf" type="static_transform_publisher" args="0 0 0 0 0 0 p3at_back_left_hub p3at_back_left_wheel 100" />
<node name="BR_WheelPose" pkg="tf" type="static_transform_publisher" args="0 0 0 0 0 0 p3at_back_right_hub p3at_back_right_wheel 100" />
<node name="FL_WheelPose" pkg="tf" type="static_transform_publisher" args="0 0 0 0 0 0 p3at_front_left_hub p3at_front_left_wheel 100" />
<node name="FR_WheelPose" pkg="tf" type="static_transform_publisher" args="0 0 0 0 0 0 p3at_front_right_hub p3at_front_right_wheel 100" />

<!--<group ns="scout">-->
    <param name="tf_prefix" value="" />
    <param name="use_sim_time" value="true" />
    <rosparam file="$(find nav2d_tutorials)/param/ros.yaml"/>

    <!-- Start the Operator to control the simulated robot -->
    <node name="Operator" pkg="nav2d_operator" type="operator" >
        <remap from="scan" to="scout/base_scan"/>
        <rosparam file="$(find nav2d_tutorials)/param/operator.yaml"/>
        <rosparam file="$(find nav2d_tutorials)/param/costmap.yaml" ns="local_map" />
    </node>

    <!-- Start Mapper to genreate map from laser scans -->
    <node name="Mapper" pkg="nav2d_karto" type="mapper">
        <remap from="scan" to="scout/base_scan"/>
        <rosparam file="$(find nav2d_tutorials)/param/mapper.yaml"/>
    </node>

    <!-- Start the Navigator to move the robot autonomously -->
    <node name="Navigator" pkg="nav2d_navigator" type="navigator">
        <rosparam file="$(find nav2d_tutorials)/param/navigator.yaml"/>
    </node>

    <node name="GetMap" pkg="nav2d_navigator" type="get_map_client" />
    <node name="Explore" pkg="nav2d_navigator" type="explore_client" />
    <node name="SetGoal" pkg="nav2d_navigator" type="set_goal_client" />

    <!-- Start the joystick-driver and remote-controller for operation-->
    <node name="Joystick" pkg="joy" type="joy_node" />
    <node name="Remote" pkg="nav2d_remote" type="remote_joy" />
<!--</group>-->
        <!-- Some general parameters -->
<param name="use_sim_time" value="true" />
<rosparam file="$(find nav2d_tutorials)/param/ros.yaml"/>

<!-- Pioneer model for fancy visualization -->
<!-- Comment this out if you do not have the package 'p2os' available! -->
<include file="$(find p2os_urdf)/launch/pioneer3at_urdf.launch" />

<node name="RVIZ" pkg="rviz" type="rviz" args=" -d $(find nav2d_tutorials)/param/tutorial3.rviz"/>

</launch>


I commented group ns because it publishes topics with prefix "scout" which doesn't creates problem in loading robot in rviz.

I am trying to repeat the tutorial 3 with gazebo and rviz.

Where I am going wrong.Kindly correct me.

Thanks in advance.

2016-03-17 04:25:28 -0500 received badge  Enthusiast
2016-03-13 23:01:33 -0500 commented question Rosserial_xbee fails to connect xbees

Is it the problem in software serialnode.py or hardware? Hope there wont be problem in hardware connection bcz of same hardware tested in X-CTU.So what I can do in software

2016-03-13 23:00:11 -0500 commented question Rosserial_xbee fails to connect xbees

Xbee end device RSSI is blinking means it can receive data from co-ordinator. But CO-orninator RSSI never turns up. Means its not receiving sync from end device.SO what might be the problem in end device

2016-03-13 22:58:08 -0500 commented question Rosserial_xbee fails to connect xbees

The device is actually connected to " /dev/ttyUSB0 ". Even I verified earlier.

I am tyring to narrow down the problem to know who is the root cause.

Problem is not with xbee:bcz xbee can communicate in X-CTU using windows.

Xbee configuration doesn't have any problem.

2016-03-13 20:53:22 -0500 answered a question Rosserial_xbee fails to connect xbees

Hi,

I checked with the device connection before itself as well as now with your command.

Still same problem.

I am able to check the rostopic.Which is published by Xbee as /diagnostics

**header: seq: 14 stamp: secs: 1457920159 nsecs: 757045984 frame_id: '' status:


level: 2
name: rosserial_python
message: no sync with device
hardware_id: ''
values: 
  - 
    key: last sync
    value: Mon Mar 14 09:49:04 2016
  - 
    key: last sync lost
    value: Mon Mar 14 09:49:19 2016**

Any Idea now??.. But what i think is co-ordinator able to communicate with End device with board. The end device is not able to connect with master it seems. I dont know whats the problem.

2016-03-11 00:36:24 -0500 asked a question Rosserial_xbee fails to connect xbees

My Xbee works fine with X-CTU in windows.

When I try to transfer data between XBee- end device with arduino to Xbee-coordinator connected to PC using

rosrun rosserial_xbee xbee_network.py /dev/ttyUSB0 1

I am getting following error :

Unable to sync with device; possible link problem or link software version mismatch such as hydro rosserial_python with groovy Arduino

I followed the http://wiki.ros.org/rosserial_xbee/Tu... tutorial which works fine for me the first time.

But now its not working.I didn't change any version after that.

I am using ROS Hydro on Ubuntu 12.0.4

Sparkfun Xbee Kit series 1.

Can anyone please help me to solve this problem.

2016-03-10 22:09:30 -0500 answered a question ROS Serial Xbee - Unable to sync with device

Hemant: did u solve the xbee issue? I am facing the same problem. It works the first time. Two days later "Unable to sync with device; possible link problem or link software version mismatch such as hydro rosserial_python with groovy Arduino". I tried installing again. It's working in X CTU.