surabhi96 / library-navigating-robot Goto Github PK

This error is shown when if I record all the topic using rosbags while creating map.

Download Logitech webcam software for windows.
You can change the level of auto-focus by following steps described in:
http://support.logitech.com/en_us/article/27005

OpenCV Error: Assertion failed (size.width>0 && size.height>0) in imshow, file /home/radha/opencv-2.4.9/modules/highgui/src/window.cpp, line 269
terminate called after throwing an instance of 'cv::Exception'
what(): /home/radha/opencv-2.4.9/modules/highgui/src/window.cpp:269: error: (-215) size.width>0 && size.height>0 in function imshow

In an attempt to move as close to the wall as possible it was observed in rviz that the turtlebot moves along the edges of a purple/magenta coloured boundary surrounding any obstacle.
This boundary (the safety margin) can be altered by altering the 'inflation radius' parameter in the 'costmap_common_params.yaml' file.

You probably don't have openni_launch in your system.
Check with $apt-cache policy openni*
This will show if the program is installed in your system or not.
If you see among the options,
ros-indigo-openni-launch:
Installed: (none)
That means it is not installed.
Now..
Run the command:
$sudo apt-get install ros--openni-launch
Eg. $sudo apt-get install ros-indigo-openni-launch

OpenCV Error: Assertion failed (src[i].channels() == 3) in find, file /home/radha/opencv-2.4.9/modules/stitching/src/seam_finders.cpp, line 1086
terminate called after throwing an instance of 'cv::Exception'
what(): /home/radha/opencv-2.4.9/modules/stitching/src/seam_finders.cpp:1086: error: (-215) src[i].channels() == 3 in function find

Make sure the command:
echo $TURTLEBOT_3D_SENSOR
returns the name of the sensor you've connected to the turtlebot.

Use the following command to update your sensor in .bashrc: (eg. for kinect)
echo "export TURTLEBOT_3D_SENSOR=kinect" >> .bashrc

On setting the 'inflation radius'(a parameter found in costmap_common_params.yaml file) as zero the gmapping node was giving a 'move_base' error. This error got resolved upon restoring the inflation radius to a value greater than zero.

Firmware Version: 0x0 = (unknown) WARNING: Communication failure, is the MFRC522 properly connected?

After successful installation, upon running "rtabmap", I get this error:
ERROR:
error while loading shared libraries: librtabmap_core.so.11: cannot open shared object file: No such file or directory

SOLUTION:
Find the exact location of the said library (here- librtabmap_core.so.11), and put it in the LD_LIBRARY_PATH using the command:
export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/opt/ros/indigo/lib/x86_64-linux-gnu

(In my case the location was: /opt/ros/indigo/lib/x86_64-linux-gnu)

Get this error on entering
rosrun rosserial_python serial_node.py /dev/ttyACM0

[ERROR] [WallTime: 1513751942.556744] Creation of publisher failed: adc_voltage
ROS path [0]=/opt/ros/indigo/share/ros
ROS path [1]=/opt/ros/indigo/share
ROS path [2]=/opt/ros/indigo/stacks
[ERROR] [WallTime: 1513751943.527116] Tried to publish before configured, topic id 125
[ERROR] [WallTime: 1513751944.530781] Tried to publish before configured, topic id 125

running roslaunch turtlebot_bringup minimal.launch doesn't require sourcing turtlebot ws
but to run roslaunch turtlebot_teleop keyboard_teleop.launch we need to source turtlebot ws
Note: turtlebot_bringup and turtlebot_teleop are the two packages in turtlebot ws

Check if your keyboard_teleop node is active.
Turtlebot will not move in this case because both the keyboard_teleop and the 2D nav goal publish on the same move_base topic

i got this([rosrun] Couldn't find executable named make_library.py below /opt/ros/indigo/share/rosserial_client) error while trying to generate custom message for Arduino from the command:
rosrun rosserial_client make_library.py ~/sketchbook/library adc_voltage

The main problem was we were unable to access rviz on our remote desktop. I wanted to open rviz on the host system after connecting it via ssh. For which I had entered the following commands.
$ssh [email protected]
entered password
$rosrun rviz rviz
error: rviz: cannot connect to X server
Solution:
$ssh -X [email protected]
This works!!

Make sure you have included the header file:
#include <std_msgs/Float64.h>

ERROR:
Invalid tag: environment variable 'TURTLEBOT_BASE' is not set. Arg xml is

The minimal.launch and keyboard_teleop.launch are working fine.But there is no communication between laptop and turtlebot.

The Network Manager does not react to any sort of clicks. Basically the "enable wifi" option is not getting toggled.

Error pops up while running rviz in turtlebot gazebo simulations
$roslaunch turtlebot_rviz_launchers view_robot.launch

File "red_detect.py", line 54, in
box = cv2.boxPoints(rect)
AttributeError: 'module' object has no attribute 'boxPoints'