vivek's profile - activity

im using a hokuyo urg-04lx , and whenever i run hokuyo_node i get this error

Exception thrown while opening Hokuyo. timeout reached (in hokuyo::laser::laserReadline) You may find further details at http://www.ros.org/wiki/hokuyo_node/Troubleshooting

and

Laser returned abnormal status message, aborting: Trouble!! Error Code=[06->06] You may be able to find further information at http://www.ros.org/wiki/hokuyo_node/Troubleshooting/

is there any solution ?

hey im trying to use AMCL on an asctec pelican, im using odometry from the imu which is not very good. i am able to make a map from hector mapping without odometry, but amcl dosent work , my tf is map -> odom -> base_link -> base_laser , im using a hokuyo laser range finder this is the error im getting TF_OLD_DATA ignoring data from the past for frame /base_link at time 0 according to authority /odometry_publisher Possible reasons are listed at plus Message from [/hokuyo_node] has a non-fully-qualified frame_id [laser_link]. Resolved locally to [/laser_link]. This is will likely not work in multi-robot systems. This message will only print once. can someone please tell me what im missing ?

hi im using hector mapping on my quardotor and have problems with the theta coming out of /poseupdate. When i yaw the quad 90 degrees i get a value of 0.63 - 0.7 . If i consider this to be in radians and convert it, the value in degrees is about 36 - 40 degrees. I've also tried with laser scan matcher with the same result.

hi im using an asctec quadrotor, and i would like to map the environment, the only odometry data that i can provide is the velocity, can someone please suggest which form of mapping is the most suitable ? im using a hokuyo urg lidar as my sensor

@joq i dont think its a memory issue as nothing else stops. all other applications running in the background is fine. plus my system doesn't fail. only roscore is the problem.

I restart roscore because the programs stop working. The 2 cases work normally when the error doesn't happen. As soon as it happens case 2 wont work

@dornhege when i restart roscore i have to restart all the programs to get them working again. The problem comes when the error happens while running the program and some flags arent recieved by the subscriber and i have to restart the program

@jog theese conditions work for me too. but the problem happens suddenly and randomly. Sometimes after 2 hours of starting roscore , somethimes in 10 mins. Cant pinpoint when this happens as its very very random.

i am running roscore in a separate terminal. Plus if the roscore is restarted then the rostopic echo's shouldn't work any way. But it works only if i start the publisher 1st and then echo. It wont if i echo and then publish.

Hi

Im having a small problem with my roscore. What happens is while running my code, after a while i publish flags for another program and the flags are never subscribed. Basically this is what happens. I have 2 nodes A and B. A subscribes to a topic "example" and B publishes data into in at around 20Hz. If i start B and then start A its able to subscribe. But if i start A and then start B nothing happens. Bascally what ive found is that if you subscribe to something and then publish, the subscriber will not recieve the data. But if i were publishing and then subscribe, then ill get the data. I know that this is not the problem because ive verified it using rostopic echo and rostopic pub. I echo and publish data, nothing is recieved but if i publish and echo i see the data on the terminal. BTW restarting roscore resolves this issue. The worst part of this is that it also happens when i run the code. Can someone help me out. Im using ros electric on ubuntu 11.10

After the error starts there are 2 cases (only roscore running so far, closed the rest)

Case 1

a. Open a new terminal and type "rostopic pub /stat geometry_msgs/Point -r 20 -- 0 1 0

b. Open another terminal and type "rostopic echo /stat"

In this case i will get the desired output during echo

Case 2

a. Open another terminal and type "rostopic echo /stat"

b. Open a new terminal and type "rostopic pub /stat geometry_msgs/Point -r 20 -- 0 1 0

In this case i do not get any output on the echo

Please tell me if i have made my problem clear

hey im trying to implement the same thing. Could u please tell me how to get it to compile using rosmake

im trying to create a ros package with an open cv program , but while doing a rosmake command i get an error error while loading shared libraries: libcv_bridge.so: cannot open shared object file: No such file or directory ive installed the vision open cv for ros. is there anything that im missing ? do i have to install the actual open cv headers ?