ROS tutorial #2.1: C++ walkthrough of publisher / subscriber lab

[@tex792]

I've been trying to learn ROS for about 4 months now and have been making slow progress. This is probably the best tutorial I've seen in that time! Most examples are too simplified to be very useful, or they do not have enough explanation for a beginner. This one was great!

[@milanky]

Check out this course www.udemy.com/course/ros-tutorials/?couponCode=ROSPROMO

[@santhoshkumar-ty7pb]

@@milanky The content is good but the sound from the speech makes my ear pain.

[@JatinChauhanJoy]

At 03:00 Run these command to get there: cd ~/{catkin workspace location}/src/location_monitor/src for example: cd ~/catkin_ws_indigo/src/location_monitor/src and then to edit the cpp file: vim location_monitor.cpp OR gedit location_monitor.cpp

[@Shanilka.Ariyarathne]

I'm using ros kinetic , can you please tell me how i do this, changing "indigo" into "kinetic" not work.

[@sorenkaden8615]

You probably dont give a shit but does someone know of a way to log back into an instagram account? I somehow forgot the login password. I appreciate any assistance you can offer me!

[@simonphillip2048]

@Soren Kaden Instablaster =)

[@sorenkaden8615]

@Simon Phillip Thanks so much for your reply. I got to the site thru google and Im trying it out atm. Looks like it's gonna take quite some time so I will reply here later when my account password hopefully is recovered.

[@sorenkaden8615]

@Simon Phillip it did the trick and I now got access to my account again. Im so happy! Thanks so much, you really help me out :D

[@lbv7]

Incredibly helpful. You have no idea how much you have been a helping hand with this. Thank you very much, man.

[@milanky]

Check out this course www.udemy.com/course/ros-tutorials/?couponCode=ROSPROMO

[@hanjia3952]

Thanks for the video! Missing something at 3:00.

[@ahmedallam9612]

I really appreciate the effort you put on to make such tutorial, THANK YOU

[@sekomer]

greatest tutorials on youtube, thanks

[@Triangle893]

Justin, Can you please correct the video, you missed the piece at the point 03:01, where it jumps to code editor. Thanks! Nick

[@runnercto]

Bump

[@JustinHuang101]

+Nikolay Grigoryev Sorry about that! I probably won't get around to fixing it since I don't even remember what I was trying to say there. Hopefully future videos will redundantly explain whatever was cut out.

[@trandrew96]

I understand what you were trying to explain but I don't know how you got to that file (it's a 'CMakeLists.txt' file for a location_monitor package, right?).

[@YTdama1]

He wrote a simple application to subscribe the "adom" topic. You can see the formal ROS documentation about writing a simple publisher/subscriber application wiki.ros.org/ROS/Tutorials/WritingPublisherSubscriber(c%2B%2B)

[@dirkiecool]

You are the best. Thanks Justin

[@khalidowlwalid4330]

Really great tutorial! Love it!

[@darshanrameshbhanushali4105]

thanks. i like the long version.. more information and experience being shared :) Thanks :)

[@wc-jai667]

please any one explain me in detail, after 3:00..... please!!!!! i created my workspace but when i use this: cd ~//src/location_monitor/src it shows "No such file or directory" HELP ME

[@muhammadadilkhalil9681]

Probably you haven't source your setup.bash file inside the dev folder...

[@milanky]

Check out this course www.udemy.com/course/ros-tutorials/?couponCode=ROSPROMO

[@wc-jai667]

iam back.....and i am dum to ask this question :p

[@danylomalyuta7411]

Justin, this is a fantastic tutorial - thanks a lot. You mention topics being covered in further videos, but it seems no more videos are beyond tutorial #2.2. What made you stop? I'm looking forward to more tutorials from you, in any case.

[@ovidiurosu6632]

Amazing. Thank you very much :)

[@tesla.8410]

Please make more tutorials like this!

[@fandrade9]

great work! nice and clear tutorial!

[@elifcliff]

Thanks! It is so helpful!

[@stillepic5174]

how did he open a new terminal from the cpp terminal using 'wq' ?

[@olubukolaogunsola5864]

I get and error on the FindClosest method, it says LandmarkDistance is not a type

[@THEINDIANGEEKS]

Justin, [rosrun] Couldn't find executable named beginner_tutorials_node below /home/vag/catkin_ws/src/beginner_tutorials i am getting this error after following the steps shown in the video pls help me

[@Claxiux]

Hi, it would be really valuable if you could upload your code somewhere so that we could have a detailed look. Thank you for your videos

[@DutGi]

Hi guys, missing piece seems to be: cd ~/catkin_ws_indigo/src/location_monitor/src vim location_monitor.cpp :)

[@yan990332]

Hi, thank you for pointing out. However, I am using another approach. 1st, create a package named "location_monitor" that includes the dependencies of roscpp and rospy (if you are using python as well). (see here: wiki.ros.org/ROS/Tutorials/BuildingPackages) Then, instead of using "catkin build", use "catkin_make" (in ~/catkin_ws folder) every time you make any changes in CMakeList, package.xml and the executable code. By following the rules above, you can build the exact project based on the tutorial provided by Justin Huang. Hope eveyone enjoy coding...

[@parisrigakis1218]

Bryan Loo Thanks a lot mate. I was stuck and your comment saved me.

[@Shanilka.Ariyarathne]

I'm using ros kinetic , can you please tell me how i do this, changing "indigo" into "kinetic" not working.

[@krisshcool6381]

@@yan990332 hello .if you have any video for create above one.could you please share with us

[@MrBaristaPaul]

Hi Justin, thanks for the tutorial. I really enjoyed your first tutorial. I'm quite new to Linux and obviously ROS, and I couldn't follow this tutorial after the 3:00 mark where a section of the tutorial was erased. Could you fix this?

[@JustinHuang101]

+LanderNine Thanks for pointing it out. Unfortunately I probably won't get around to it, but hopefully future videos will repeat the steps and make it more clear.

[@kashifzaheer7804]

add_dependencies (location_monitor_node location_monitor_generate_messages_cpp) cause catkin related problem, location_monitor_generate_messages_cpp of target "location_monitor_node" does not exit. how to solve policy related porblem (policy CMP0046)

[@andrearomero3336]

When did you explained how you created the catkin workspace? :(

[@olubukolaogunsola5864]

did anybody else get the error "only constructors take member initializers 17 | Landmarkmonitor(): landmarks_(){ " ?

[@yugimuto5286]

Is there a repository for this code?

[@rohankumaryadav707]

Please someone tell me how to start catkin work space from the video cut time?

[@vinhk1382]

Justin, how can I make the turtlebot go through a corridor when there is enough space and stop when there isn't enough space for it to go through?

[@hemang12345]

Hi Justin, thanks for the video; it was super helpful. i didn't get how did you find the position of the structures in simulator like "cylinders", "Bookshelf" ?? Thank you

[@anerdwitdacamera204]

A stupid question you may have mentioned before: how to avoid typing "source opt/ros/xxxxx/setup.bash" every time I open a new terminal? Thanks!

[@kid-vf4lu]

Any pointers to setting up my own header files and their .cpp files in ROS? I have tried adding my .h files to include/package/ but it's not working.

[@zishanahmedshaikh]

Great job mate

[@nova495]

I've been following the tutorial closely yet I can't autogenerate the LandmarkDistance.h file from the corresponding .msg file. Not sure what to do...

[@ilhamakbar830]

some clip video was missing at 03.01, there is more info about how to make the catkin workspace : wiki.ros.org/ROS/Tutorials/InstallingandConfiguringROSEnvironment

[@vladflorian2453]

Hello Justin, I also want to thank you for your videos. I am grateful for what you have described here and in the other tutorials about ROS. I am new to this environment, just started by approx. 1 month and your tutorials helped me a lot. I would appreciate if you make that tutorial about CMakeList and maybe a bit more talk about package.xml. I am working in C++ and knowing more about these two files I think it will help me a lot in my projects. Another mini question: I have a specific package written for Fuerte version of ROS and in that package beside the usual folders and files generated after the "catkin_make" command I have a lib folder and some .cpp files in the src folder of the package. In order to make the package functional in Indigo are there many things to be considered in the CMakeList file?

[@paintedsnipe3808]

Hi Justin, Great tutorial. I hope you can find some time off to do more tutorials :-)

[@kaankoc7793]

I want to print out the "seq" of the std/msgs. How do i do that?

[@LongNguyen-ru5ry]

can you do a basic video on gmapping to create a map and basic navigation using move_base? Thanks!

[@FixedA]

it's not always clear what buttons on the keyboard you press

[@inventaunmanana4860]

hi, where do you get the objects coordinates (cube, bookshelf, etc) ??

[@phadadev2307]

Thanks a lot sir. :) :) :)

[@田子杰-v1z]

Good tutorial !!!

[@rajeshnaiduundipalli6762]

Broo..please sent that src file ..I have a problem in making location_monitor it's not executable..

[@chaimabens1027]

Hi justin, I have a problem with catkin build i try to do the same steps but when I write the command catkin build i find that this command not found, I'm new in this environment

[@napoleonampahjnr.6509]

Go into the workspace folder and run catkin_make instead it works the same way

[@harshitagarwal5188]

while running `catkin_make` from my workspace directory i was getting an error that `The specified source space "/home/harshit/ros_dir/src" does not exists` what may be the reason ?

[@JustinHuang101]

+Harshit Agarwal You may have already figured it out. I think that error occurs when you don't run catkin_make in the right folder. It needs to be in the root of the catkin workspace, so if your workspace is ~/catkin_ws, then that's where you need to run catkin_make from. If that's what you did, then I'm not sure what the problem is, sorry!

[@hemang12345]

why is there is const Landmark& landmark = landmark_[i], cant it be simple Landmark landmark = landmark_[i] why do we need const object If some one could clarify

[@RahmanUsta]

Can we find it as a text tutorial?

[@nicholasbuenger2601]

Is perfect! Now I understand everything better :D Thank you very much Ah, when is the next tutorial coming?

[@dipinanda1]

Nothing on Python?

[@LongNguyen-ru5ry]

Justin, thanks for the video! Your first tutorial was in Python, is it possible to do some of these in python?

[@JustinHuang101]

+Long Nguyen thanks for the kind words. I do plan on doing both Python and C++ for most of the time, so look for the Python version later!

[@JustinHuang101]

+Long Nguyen Python version is at kzbin.info/www/bejne/en25qpZvnbSpoZo

[@saravanabalagi]

@@JustinHuang101 Please add it to the description please :)

[@The_midnight_motivator]

I know c++ but iam not able to understand what u r trying to make us understand

[@govindrao1640]

Hi please tell me -> "robot operating system bidirectional nodes c++ programming"

[@onurozbek2033]

Great tutorial buddy but you should not skip how you create things, especially the boiler plate code. Skipping details is not a good idea in a beginner's tutorial.

[@designworks7347]

de need more video

[@karimalaya1670]

cool tutorial can you make a video using python

[@JustinHuang101]

+karim alaya I just did a Python version of this tutorial at kzbin.info/www/bejne/en25qpZvnbSpoZo

[@savinorojas6836]

U lost me at 3 min :(

[@quanglevan5020]

At 3:00 you should do: cd ~/your_workspace/src catkin_create_pkg location_monitor rospy nav_msgs cd ~/your_workspace catkin_make cd ~/your_workspace/src/location_monitor/ mkdir -p ~/your_workspace/src/location_monitor/src vim ~/your_workspace/src/location_monitor/src/filename.cpp

[@jacopojacopo648]

all I learned from this video is that you say a lot of : "uhm" and you skip from one page to another without explaining

[@lebjam131]

DON"T WATCH MISSING SETUP WILL WASTE TIME!

[@herrdesai6853]

how does a location monitor file appear in the src folder ? I have edited the c ++ code but cannot see the file in the folder . Please help me out . Thanks in advance

[@milanky]

Check out this course www.udemy.com/course/ros-tutorials/?couponCode=ROSPROMO