Hemanth's profile - activity

Hello guys,

I am running the gmapping algorithm with the required transforms and the scan and odom topics using rplidar. While i am able to get the map, whenever i turn the map also turns in rviz creating some overlap between two different maps. I dont know if any of the gmapping parameters or robot_localization ekf paramaters need to be changed. It would be very helpful if someone can point this out. Also, i am not sure if there is an option in rviz or something to do this either. I would be happy to provide with any other information that is required.

Here is my ekf launch file parameters in a yaml file.C:\fakepath\rl_param.png

frequency: 50

two_d_mode: true

diagnostics_agg: true

odom0: /raw_odom

odom0_config: [false, false, false, false, false, false, true, true, false, false, false, true, false, false, false]

odom0_differential: true

odom0_relative: false

imu0: /imu/data

imu0_config: [false, false, false, false, false, true, false, false, false, false, false, true, false, false, false]

imu0_differential: true

imu0_relative: true

odom_frame: odom

base_link_frame: base_link

world_frame: odom

The laser scan in rviz also rotates not just when i turn the robot but also when im moving it forward or backward. Looks like there is some odom or tf issue as billy suggested. Please help me diagnose it. What do i need to check other than tf_tree. Here is my tf_tree

Hi, this worked for me. Give it a try! https://answers.ros.org/question/348079/cant-establish-connection-to-web-server-u

Hi, this worked for me. https://answers.ros.org/question/348079/cant-establish-connection-to-web-server-using-rosbridge/

Hello everyone, I have the same problem. Was anybody able to solve it?

Hey, were you able to figure out how to solve this error? I have the same error. Thanks.

Hey, Were you able to figure out how to approach this? I appreciate your thoughts.

Hello,

I wanted to control my robot using teleop_twist_keyboard so that i can move it around for gmapping. I have an odometry source in the form of wheel encoders and a LIDAR. I have found a node that takes a Twist message and converts into number of encoder ticks that are to be actuated. I am having difficulty converting these ticks back into wheel motion. Can someone please suggest any source that might help or another way to approach this problem?

Hello,

I am using the talker and listener nodes to check that the communication occurs between my raspberry pi and my system. I am running Kinetic in the system and using ubiquity robotics image in the RPi which has ROS pre-installed. I am only able to send data from the RPi to the system but not vice-versa.

Here are the setup lines in my .bashrc files:

In System

export ROS_IP=172.20.10.8
export ROS_HOSTNAME=172.20.10.8
export ROS_MASTER_URI=http://172.20.10.9:11311/

In RPi (Master)

export ROS_IP=172.20.10.9
export ROS_HOSTNAME=172.20.10.9
export ROS_MASTER_URI=http://172.20.10.9:11311/

Here are my etc/hosts files

In System

127.0.0.1   localhost
127.0.1.1   01HW822483
172.20.10.9     172.20.10.9
172.20.10.8     172.20.10.8

::1     ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
172.20.10.9 172.20.10.9

In RPi

127.0.0.1         localhost
::1                  localhost ip6-localhost ip6-lookback
ff02::1            ip6-allnodes
ff02::2            ip6-allrouters

172.20.10.9   172.20.10.9
172.20.10.8   172.20.10.8

I have also included the rqt_graphs. When i run talker on the Pi and listener on the system, i can echo the /chatter topic. But when I do the reverse, i cannot observe anything in the topic.

C:\fakepath\pc2pi.png

C:\fakepath\pi2pc.png

This are the errors I get when i run roswtf

analyzing graph...
... done analyzing graph
running graph rules...
ERROR: Unknown host [my_robot.local] for node [/rosbridge_ws/rosbridge_websocket]
ERROR: Unknown host [my_robot.local] for node [/rosbridge_wss/rosbridge_websocket]
ERROR: Unknown host [my_robot.local] for node [/rosout]
ERROR: Unknown host [my_robot.local] for node [/teleop_twist_joy]
ERROR: connection refused to [http://172.20.10.9:45169/]
ERROR: Unknown host [my_robot.local] for node [/joint_state_publisher]
ERROR: Unknown host [my_robot.local] for node [/motor_node]
ERROR: Unknown host [my_robot.local] for node [/joy_node]
ERROR: Unknown host [my_robot.local] for node [/robot_state_publisher]
ERROR: Unknown host [my_robot.local] for node [/tf2_web_republisher]
ERROR: Unknown host [my_robot.local] for node [/rosbridge_wss/rosapi]

It was a firewall problem. Thanks guys.

Lidar not aligning with the map during rotation Hello, When i have linear translation, my lidar points and existing map

Did you try running sudo apt-get update You can also check the sources list for ROS through this command. cat /etc/a

Did you try running sudo apt-get update?

To fix this error: roslaunch beginner_tutorials turtlemimic.launch [beginner_tutorials] is not a package or launch fil

I am not sure if I understood your question right but you cannot have two masters running at once. You can only have one

I was able to launch a node remotely and that node was not installed locally. However, I am observing a problem with lau

I am using the roscore command in the terminal to run roscore. It shows "started roslaunch server http://127.20.10.9:39

Hi, I have followed what you suggested. I found out the hostname of both the devices in /etc/hostname and changed the RO

Yes, I do have a roscore running on the raspberry

Communication occurs only one way between devices Hello, I am using the talker and listener nodes to check that the com

Communication occurs only one way between devices Hello, I am using the talker and listener nodes to check that the com

Communication occurs only one way between devices Hello, I am using the talker and listener nodes to check that the com

Map rotation in rviz during gmapping Hello guys, I am running the gmapping algorithm with the required transforms and t

You are right billy, the laser scan is also rotating. I have updated the question.

Map rotation in rviz during gmapping Hello guys, I am running the gmapping algorithm with the required transforms and t

Map rotation in rviz during gmapping Hello guys, I am running the gmapping algorithm with the required transforms and t

Map rotation in rviz during gmapping Hello guys, I am running the gmapping algorithm with the required transforms and t

I have updated the question with the text. Thank you for the suggestion.

Map rotation in rviz during gmapping Hello guys, I am running the gmapping algorithm with the required transforms and t

Map rotation in rviz during gmapping Hello guys, I am running the gmapping algorithm with the required transforms and t

Hello, were you able to figure out what those messages mean. I am facing the same issue right now? Thank you.

Map rotation in rviz during gmapping Hello guys, I am running the gmapping algorithm with the required transforms and t