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2014-11-26 12:10:55 -0500 commented answer Getting the navigation goal from RVIZ

Sorry about that. How do I convert the PoseStamped to MoveBaseGoal() if at all possible?

2014-11-26 11:40:38 -0500 commented answer How to start a ros node

seems like the only way I can run /camera/camera_nodelet_manager is to launch openni.launch

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2014-11-25 13:24:47 -0500 asked a question How to start a ros node

How do I start a ros node from the terminal? For example I'm looking to start the node /camera/camera_nodelet_manager but I have no idea how? Do I use rosrun?

2014-11-25 13:15:27 -0500 commented answer Getting the navigation goal from RVIZ

@David thanks got it. Do you know how I can now convert this to a goal coordinate. Im not having any luck

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2014-11-03 11:06:03 -0500 asked a question Getting the navigation goal from RVIZ

I am able to get the initial pose of my turtlebot using :

rospy.wait_for_message('initialpose', PoseWithCovarianceStamped)

rospy.Subscriber('initialpose', PoseWithCovarianceStamped)

This allows me to get a the initial pose when a user clicks sets the 2d Pose estimate in RVIZ. My question is threefold

  • How do I achieve the same with the 2d Navigation Goal (getting it fom RVIZ)?
  • What message should I wait for and subscribe to?
  • What TYPE of message am I looking for? For example with initialpose I get a PoseWithCovarianceStamped message.
2014-10-24 04:17:04 -0500 commented question Can't navigate and use camera at the same time

@ahendrix please check the updated question

2014-10-24 04:16:31 -0500 answered a question Can't navigate and use camera at the same time

@ahendrix please check the updated question

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2014-10-24 03:03:41 -0500 asked a question Can't navigate and use camera at the same time

I am working on a project that requires both navigation and object recognition modules. The problem I have is that modules work when they are run individually but as soon as I try to run them simultaneously then one fails. I I start amcl first I can do the navigation but there is no data from the /camera/rgb/image_mono (although there is data on the /camera/ir/image_raw topic) topic even after running roslaunch openni_launch openni.launch.

If I start openni.launch first then in amcl I get the error :

extrapolation error looking up robot pose.

Can I not do both at the same time when using the /camera/rgb/image_mono topic?

I am using the Kinect Sensor that comes with the turtlebot for both recognition and navigation. The ros distribution is groovy.

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2014-10-17 13:21:01 -0500 commented answer Subscriber data not up to date

That's right! And by the time Im done processing some time would have passed!! So in terms of viewing the data Ill always be behind..

2014-10-17 11:22:23 -0500 commented question Subscriber data not up to date

@BennyRe I tried it on on image_view and theres no lag but that is because I do a lot of processing on the image before I display it (cv2.imshow) . Now I cannot process at the rate that the publisher is publishing and so what I want to do is drop any messages that arrive while I am processing.

2014-10-17 11:00:35 -0500 commented question Subscriber data not up to date

@ahendrix Its about 5 to 10 seconds of lag. Basically when I look at the screen it shows images of things that happened 5 to 10 swconds ago.

2014-10-16 19:58:15 -0500 asked a question Subscriber data not up to date

I have written a subscriber to one of the image topics and I have set my buffer to 1 using:

subscriber =rospy.Subscriber("/camera/rgb/image_mono/compressed",CompressedImage, callback, queue_size=1)

However my subscriber still lags behind. Any idea what might be causing this? Am I setting the queue size correctly?

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