Morgenstern's profile - activity

Maybe it's late to answer, but i couldn't find camera node too. But then i found camera as a topic with this command: r

Maybe it's late to answer, but i couldn't find camera node too. But then i found camera as a topic with this command: r

Maybe it's late to answer, but i couldn't find camera node too. But then i found camera as topic with this command: ros

Probably you are writin wrong somethin. (Incompletely)

Sorry don't know.

For me i tested Jetson Nano and it can challenge with my laptop GTX950M GPU. But for finding reasources side it's not th

For me i tested Jetosn Nano and it can challenge with my laptop GTX950M GPU. But for finding reasources side it's not th

For me i tested Jetosn Nano and it can challenge with my laptop GTX950M GPU. But for software side it's not that good. C

You can check this https://stackoverflow.com/questions/22470902/understanding-moments-function-in-opencv#:~:text=Definit

You can check this https://stackoverflow.com/questions/22470902/understanding-moments-function-in-opencv#:~:text=Definit

You can check this link%20of%20image.&text=Here%20you%20can%20read%20the,They%20are%20called%20raw%20moments.)

For answer who may search for it: You can only use ROS melodic with Jetson Nano. Maybe you can use another destributio

For answer who may search for it: You can only use ROS melodic with Jetson Nano. Maybe you can but wtih docker If you

Hello everyone,

I am trying to learn Autonomous Cars… I am totally new to these things I am trying to do my self driving rc car(1/10 scale). Like Donkeycar. But i want to realize it with ROS. I got rpi camera V2. I searched internet and just find that i can use rpi camera with ros kinetic. Are there any way to rpi camera with Jetson Nano on ROS. Cause as i can learned i can only install ros melodic to jetson nano.

Now i am using:

Jetson Nano JetPack 4.4 ROS Melodic

My questions are:

1) Can i use ros kinetic with jetson nano 2) Can i use rpi cam with ros melodic 3) There is a node for rpi camera like i said (in ros Kinetic) can i use this node in ros melodic

For me it’s urgent. I would be grateful for any help. Can you help me. Thanks.

For answer who may search for it: 1) You can only use ROS melodic with Jetson Nano. Maybe you can but wtih docker 2) If

ROS Melodic with Rpi Cam Hello everyone, I am trying to learn Autonomous Cars… I am totally new to these things I am tr

I'm new to ROS and trying to learn from a book "ROS Robotics Projects". I'm using Ubuntu 18.04 LTS and ROS Melodic Morenia. I'm trying to build a robot simulation. And I was following instructions and stucked. I created robot_base.urdf.xacro and robot_essentials.xacro files. Here is the content of files = -robot_base.urdf.xacro

<?xml version="1.0"?>
<robot xmlns:xacro="http://ros.org/wiki/xacro" name="robot_base" >

<link name="base_link">
<visual>
<origin
xyz="0 0 0"
rpy="1.5707963267949 0 3.14" />
<geometry>
<mesh filename="package://robot_description/meshes/robot_base.stl"/>
</geometry>
<material
name="">
<color
rgba="0.79216 0.81961 0.93333 1" />
</material>
</visual>
</link>

<xacro:robot_wheel prefix="front_left"/>
<xacro:robot_wheel prefix="front_right"/>
<xacro:robot_wheel prefix="rear_left"/>
<xacro:robot_wheel prefix="rear_right"/>

<xacro:wheel_joint prefix="front_left" origin="0.220 0.250 0"/>
<xacro:wheel_joint prefix="front_right" origin="0.220 -0.250 0"/>
<xacro:wheel_joint prefix="rear_left" origin="-0.220 0.250 0"/>
<xacro:wheel_joint prefix="rear_right" origin="-0.220 -0.250 0"/>

</robot>

and -robot_essentials.xacro =

<?xml version="1.0"?>
<robot xmlns:xacro="http://ros.org/wiki/xacro" name="robot_essentials" >
<xacro:macro name="robot_wheel" params="prefix">
<link name="${prefix}_wheel">
<visual>
<origin
xyz="0 0 0"
rpy="1.5707963267949 0 0" />
<geometry>
<mesh filename="package://robot_description/meshes/wheel.stl" />
</geometry>
<material
name="">
<color
rgba="0.79216 0.81961 0.93333 1" />
</material>
</visual>
</link>
</xacro:macro>

<xacro:macro name="wheel_joint" params="prefix origin">
<joint name="${prefix}_wheel_joint" type="continuous">
<axis xyz="0 1 0"/>
<parent link ="base_link"/>
<child link ="${prefix}_wheel"/>
<origin rpy ="0 0 0" xyz= "${origin}"/>
</joint>
</xacro:macro>

</robot>

Than I'm trying to run this command :

roslaunch urdf_tutorial display.launch model:=robot_base.urdf.xacro

I'm getting this error =

unknown macro name: robot_wheel
when processing file: robot_base.urdf.xacro
RLException: Invalid <param> tag: Cannot load command parameter [robot_description]: command [['/opt/ros/melodic/share/xacro/xacro.py', 'robot_base.urdf.xacro']] returned with code [2]. 
Param xml is <param command="$(find xacro)/xacro.py $(arg model)" name="robot_description"/>
The traceback for the exception was written to the log file*

Can you help me to get the issue and solve it.

Thanks.

Hello everyone,

I'm trying to learn ROS. I'm totally noob. I'm using Ubuntu 18.04 LTS and ROS Melodic Morenia.

My question is I'm trying to create a robot that can control from control center. Robot system is running with ROS i know that but can't figure out how will my computer communicate with the system. I saw some web gui s but i am curious about what if i want to communicate locally i mean maybe with usb to usb or with ethernet cable like host-client. How can i do that and which packages can help me in ROS.

Thank you.

How to make Gui for control center Hello everyone, I'm trying to learn ROS. I'm totally noob. I'm using Ubuntu 18.04 LT