aviprobo's profile - activity

Hi, if you followed the steps I took, did you run "rosmake sick_tim3xx" ? Make sure you added the directory path of the sick directory to your .bashrc path.

Thanks Stefan! Now, once I have acquired the translation from map to robot pose estimate, if I want to send a goal to the map (map co-ordinates), how am I able to translate from metric back to grid? Do I still use tf to perform the translation from metric to grid or is there another way?

We are building a SLAM map using our Turtlebot. During the process, we stop the Turtlebot at certain points and would like to obtain the x,y,z values from the map coordinate frame. We are using the /map_metadata topic which we believe gives us the x,y,z values in the map. However, these values never seem to change and always stay the same in the /map_metadata topic.

Could someone please provide a solution or an alternative? Many thanks!

Edit: We've managed to obtain the corresponding robot co-ordinates by simply using

rosrun tf tf_echo /map /base_footprint

Hey everyone,

We've seem to run into a problem just earlier this week. For the past 8 months we were able to send 2d nav goals and set the 2d initial pose using Rviz perfectly fine. We are usin ROS Fuerte. Just earlier this week, we are not able to do this anymore at all. When I send the 2d nav goal, it's not getting published to the rostopic and hence, nothing seems to happen. I cannot even set the initial 2d pose estimate. We've tried reinstalling the visualization packages and still no luck at all.

Could anyone please suggest any solutions? Many thanks!

EDIT: We've solved the issue. Turns out the ROS_HOSTNAME on the workstation was incorrect.

We are working on a project whereby we are attempting to localize the robot within the map using the received wi-fi signal strength ID (RSSID). We have had a look through the amcl_node.cpp file and have a pretty general idea of how it functions. Just wondering how do we achieve localization solely on the basis of RSSID? The way we are trying to make it work is by receiving the goal co-ordinates from the user and the turtlebot navigating to the goal using the map and the wi-fi signal strength. Do we need to build a wi-fi signal strength map and then feed this through to amcl?

Thanks!

G'day everyone,

We're trying to use the sick_tim310 laser scanner to try and build a slam map. We are first launching the sick_tim310 package using

rosrun sick_tim3xx sick_tim310

and then running the gmapping package

roslaunch turtlebot_navigation gmapping_turtlebot.launch

When the gmapping package launches, we get the following warning and we are not able to build a map

[ WARN] [1389919537.481403314]: Message from [/sick_tim310] has a non-fully-qualified frame_id [laser]. Resolved locally to [/laser].  This is will likely not work in multi-robot systems.  This message will only print once.
[ WARN] [1389919551.824802632]: MessageFilter [target=/odom ]: Dropped 100.00% of messages so far. Please turn the [ros.gmapping.message_notifier] rosconsole logger to DEBUG for more information.

We've also tried changing the name of the topic to which the laser scan publishes by launching the sick_tim310 package the following way;

rosrun sick_tim3xx sick_tim310 scan:=/laser

and then we tried running the gmapping package again, but this time, there are no warnings but mapping just does not start. All we see is the following output;

    SUMMARY
========

PARAMETERS
 * /rosdistro
 * /rosversion
 * /slam_gmapping/angularUpdate
 * /slam_gmapping/astep
 * /slam_gmapping/delta
 * /slam_gmapping/iterations
 * /slam_gmapping/kernelSize
 * /slam_gmapping/lasamplerange
 * /slam_gmapping/lasamplestep
 * /slam_gmapping/linearUpdate
 * /slam_gmapping/llsamplerange
 * /slam_gmapping/llsamplestep
 * /slam_gmapping/lsigma
 * /slam_gmapping/lskip
 * /slam_gmapping/lstep
 * /slam_gmapping/map_update_interval
 * /slam_gmapping/maxUrange
 * /slam_gmapping/odom_frame
 * /slam_gmapping/ogain
 * /slam_gmapping/particles
 * /slam_gmapping/resampleThreshold
 * /slam_gmapping/sigma
 * /slam_gmapping/srr
 * /slam_gmapping/srt
 * /slam_gmapping/str
 * /slam_gmapping/stt
 * /slam_gmapping/temporalUpdate
 * /slam_gmapping/xmax
 * /slam_gmapping/xmin
 * /slam_gmapping/ymax
 * /slam_gmapping/ymin

NODES
  /
    slam_gmapping (gmapping/slam_gmapping)

ROS_MASTER_URI=http://192.168.137.8:11311

core service [/rosout] found
process[slam_gmapping-1]: started with pid [20289]

And then nothing proceeds to happen. Could anyone please be able to shed some light on this issue? Many thanks.

Hello everyone,

I'm following this tutorial on sending simple goals to the Turtlebot navigation stack; SendingSimpleGoals

When I run the program, the Turtlebot moves in a backwards direction in the sense that, it moves opposite to the direction the Kinect sensor is facing. We've calibrated the gyro and odometry as described in the wiki page but the Turtlebot never seems to move forward (in the direction the Kinect is facing). Whenever we run the program, the Turtlebot rotates a couple of times (creating a map) and then moves in the opposite direction.

Could anyone please provide some assistance as to why this is the problem?

EDIT: Thanks everyone, the kinect was mounted the wrong way around by the people who used it previously and hence why the Turtlebot was moving backwards.

I'm using the SICK_TIM310 laser scanner using ROS Fuerte. I have tried installing the appropriate package from github using (I didn't include the https:// at the start because my karma is insufficient)

svn co github.com/uos/sick_tim3xx.git

in my stacks folder and everything went fine until I tried

roslaunch sick_tim3xx sick_tim3xx.launch

I get an error saying that sick_tim3xx is not a package eventhough it was in my stacks folder. As a result, I tried downloading the files in a zip file from github and unzipped it to the stacks folder and roslaunch works fine but I get the following error now;

core service [/rosout] found

process[robot_state_publisher-1]: started with pid [27496]

ERROR: cannot launch node of type [sick_tim3xx/sick_tim3xx]: can't locate node [sick_tim3xx] in package [sick_tim3xx]

So looks like it is unable to find the sick_tim3xx node. Could I please get some assistance on how to solve this?