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Hi Ed Williams! Thanks for watching my video! “I” denotes identity matrix. Term “I” is generally used for identity matrix in linear algebra.

Hi A. T.! It is my pleasure if my videos help you!

Do you have any errors in the terminal?

@@robotmania8896 nope nothing Just world loaded and robot didn't load

@@elastico_007 Is your directory for mesh files correct? If the model not shows up, maybe the directory in the xacro file is wrong.

Hi Abdelkader Belabed! Thanks for watching my video! I think that hyper parameters are fine. I think this problem can be negated to some extend by giving a proper reward. You may make the reward bigger when robot reaches the goal.

@@robotmania8896 ok thanks , i will try it

@@robotmania8896 it's working thank you very much

Hi Stone Geoffrey! Thank you for watching my video!

Hi Yang Liu! Thanks for watching my video! If you know real coordinates of object you are tracking, it easy to calculate velocity. But I don’t think that there is a module in deepstream to do that. Also, to do this, you have to use RGBD camera.

@@robotmania8896 Thanks

Hi 郭少! Thanks for watching my video! I hope this video will help you!

@@robotmania8896 Thank you for your responese! Inspired by your video, I've solved the problem adding the <robot_param_node> tag to the gazebo-ros2-control plugin part!

Hi Cathy Norris! Thank you for watching my video!

Hi Alan Cyriac! Thanks for watching my video! Glad to hear that! Sometimes people ask me whether it is possible to move the robot using keyboard.

You may use whatever tool is convenient for you. I prefer using tools without any logins or via the Internet.

Hi Francy Llamado! Thanks for watching my video! I have never done it, but you may use DALL·E to generate a dataset.

Hi ELASTICO! Thanks for watching my video! Yes, you can. I have several videos with Ackerman steering mechanism. You can refer to URDF files for those videos.

Hi 다비! Thanks for watching my video! What error exactly do you have?

​@@robotmania8896 Can i get your email? i want to show my project's procedure...i already did do too many troubleshooting... and i want to crying ㅠㅠHa.... Basically 1. install Ros humble 2. install pytorch,torchvision 3. build opencv with cuda 4. install ros-realsense wrapper(but i realized Jetpack 6.0 doesn't support librealsense...so i should build from source, but even that also error comes. i guess JetsonHackNano's librealsense is too old version) 5. install YOLOv8-ros wrapper...purpose is operate intel realsense D455 , and if you give me email, than i can explain more better bcz i can upload the photo of errors.. plz help me ㅠㅠ

Here is my e-mail: robotmania8867@yahoo.com

@@robotmania8896 Thankyou! I sended email! i'm 제천대성

Hi Cihan Okay! Thanks for watching my video! If the arm moves in a wrong direction, probably waypoint is not set properly. Please check whether block position is recognized correctly. Yes, you can edit commands by modifying the “Pick_up_the_block” function in the “controller.py” script. If you would like to edit UI, please edit the “controller_window.ui” file using qt designer tool and convert it to python script.

Unfortunately, I don’t have python version for this tutorial, but you may use code of the tutorial you originally commented on. You should be able to use the 4WS part with small modifications.

Thank you, sir, for your guidance and information

Hi Peter Sobotta! Thanks for watching my video! Yes, it should work.

Hi GhOsT! Sorry for the late response. I visualized tf tree using “ros2 run rqt_tf_tree rqt_tf_tree” command. The tf tree for the first robot is shown normally, but tf tree for the second robot is shown only up to the “robot_2_base_link” due to the “TF_DENORMALIZSED_QUARTENION” error. I am not sure what causing this error in this case since the robots are completely identical.

Hi Mohamed Assanhaji! Thanks for watching my video! If you would like to send information using ethernet, you can use socket communication. Regarding the ethernet communication, code for this tutorial will help you. ruclips.net/video/40p2avodFV0/видео.html

Hi muhammad Ibrahim! Thanks for watching my video! No, this tutorial will not work with ROS1. But if you are interested in four-wheel steering with ROS1, this tutorial will work. ruclips.net/video/4_bftUbQTaM/видео.html

@robotmania8896 Thankyou sir, I am working on 3d model for an irrigation robot with four independently moving wheels on gazebo. I hope the link you share will work in ros 1 noetic on Ubuntu 20. Thank you so much.

Hi Temitope Ibrahim Amosa! Thanks for watching my video! What do you mean by “fail to move”? Are there any errors in the terminal?

Hi VIHAN! Thank you! I will.

Hi Massar Sara! Thanks for watching my video! Try to close all unnecessary programs to free as much memory as possible. Because editors, browsers consume a lot of memory. You also may use smaller image size for inference. Lastly, you may use smaller model.

Hi Prescription Oatmeal! Thanks for watching my video! It is my pleasure if this video has helped you!

Hi อภิวัฒน์ พิทักษ์ศิลป์! Thanks for watching my video! If you would like to use a keyboard, you can use this package to publish commands. cmower/ros2-keyboard: Keyboard driver for ROS 2. (github.com)

Hi iamshakeelsindho! Thanks for watching my video! It is my pleasure if this video has helped you!

Hi andrewli1126! Thanks for watching my video! Usually, this error occurs when you have a problem with USB cable. Can you obtain an image using the “realsense-viewer” application?

@@robotmania8896 Thanks for the reply! Yes the camera works fine with realsense-viewer, I could also import pyrealsense2 module, just that when running the script, the pipeline fails to start, returning the error: "No device connected."

@@andrewli1126 Can you get frames from the realsense using this code?(index may not be 0) import cv2 capture = cv2.VideoCapture('/dev/video0') while(True): try: ret, frame = capture.read() cv2.imshow('frame', frame) except: import traceback traceback.print_exc()

@@robotmania8896thank you for the reply! I have resolved the issue by uninstalling pyrealsense2 and rebuilding the wrapper from source. Cheers!

Hi happy new year! Thanks for watching my video! Indeed, it seems that the page is not responding. I don’t have any information about whether they are closed or not, so I guess all we can do is just to wait. Or you may open an issue at “roboportal/bot_box” page to ask about this matter.

Hi Semiu ADEBAYO! Thanks for watching my video! Unfortunately, I don’t have any other paid material. What subjects are you interested in?

edit: forgot to set up ros /sorce ect

Hi Zachary Reid! Thanks for watching my video! So, now you can build the packages successfully?

Hi Omar Salem! My pleasure!

Hi Maese! Thanks for watching my video! I don’t have Github repositories with this robot. If you would like to mention my work, you may cite this video as have described in this post. Thank you! www.scribbr.com/citing-sources/cite-a-video/

Hi Sutan Muhamad Sadam Awal! Thanks for watching my video! Yes, it is possible. If you are using gazebo classic, to get the model pose, instead of subscribing to ”/model/fws_robot/pose”(tf2_msgs.msg) topic, you should subscribe to “/gazebo/model_states”(gazebo_msgs.msg) topic. Also, launch file will be different. Please refer to launch file from my other projects.

Hi Sager Alansil! Thanks for watching my video! What is “file tetcher”?

Hi Mohammed Bourouba! Thanks for watching my video! In that case, you have to train your own model.

yes i do it but i want my robot when it detect for example turn left it turn left automatically

In that case, you can publish the “cmd_vel” topic when the robot detects “turn left” sign. Probably you will need depth camera as well to make the robot turn at right point.

What's are the changes to do in case i want to be autonomous, it's possible ?

@@mohammedbourouba9274 Do you mean, that you would like to a navigation?

Do you mean change robot size during the simulation? If so, it is possible if you will make your robot such way.

Hi chiyoung kwon! Thanks for watching my video! For a simple shape I think there are ways to do that.

Hi Vilson Wenis Belle! It is my pleasure if this video has helped you!

My pleasure!

Hi ELASTICO! Thanks for watching my video! I cannot find plugin for Gazebo sim either. I guess you have to wait till someone make it, or you should make it yourself.

Hi Thanks I added rgbd camera plugin in gazebo sim and used Ros gazebo bridge. And I can visualise depth and camera in rqt image view but not in rviz2 it's like blank white screen.

@@elastico_007 If I remember correctly, if there are no topics received, there will be “No image” writing in the window. So, probably the topic is received correctly. But I cannot tell you anything else specific.

Hi Indramal Wansekara! Thanks for watching my videos! I hope you will find videos you are interested in!

@@robotmania8896 definitely, looking for more interesting videos.

Hi tian xie! I've been coding for 15 years roughly. But I personally think that the most important is to understand theory behind the code. Also, valuable skill nowadays is to find information (code) quickly, combine it with your knowledge and get outcome you want.

Hi Kawther Trabelsi! Thanks for watching my video! With small image size and small model, you probably will be able to execute yolov8 on the Jetson Nano. But you will not be able to execute inference simultaneously on both cameras. You will need to execute inference sequentially.

Hi Serapf-p! Thanks for watching my video! It depends on computational capabilities of your machine. As far as I remember, I used CPU for training in this project. Using GPU, the training time will be shorter, but I cannot tell you for how mush exactly.

Thank you!

Hi tian xie! Thank you for your hart warming comment!

Hi Nhat Net! Thanks for watching my video! If I understand correctly, you would like to estimate object coordinates in map coordinate system? In that case, you have to do exactly what I did in this tutorial.

@@robotmania8896 yes, i want robot perceive the around objects and then, use this information for obstacle avoidance task. So, after calculating the X,Y and Z we will transform to the map. Is this right for pipeline? . And based on my understanding, currently we just determine the position of object, should i dertermine the orientation of object and how to make it. Could you recommend the materials for this. Thanks. I learned a lot of useful knowledge from your channel.😀

Curent i am doing object avoidance for robot navigation based object coordinate from camera. Could recommend for me some materials for this. Thanks

@@nhatnet479 It is my pleasure if my videos have helped you. Since general navigation algorithms use grid map, you may plot detected object position (x, y) on the grid map and then use usual algorithms. Generally, estimating object orientation is even harder than estimating object position. In some cases, knowing orientation of the object will help to predict direction of movement of the object resulting in even more smooth object avoidance. But for most applications knowing object position is enough. I found this repository regarding object avoidance using camera. Maybe it will help you. github.com/Onlee97/Object-Detection-and-Avoidance-with-Intel-Realsense

@@robotmania8896 thanks. in your code. I saw you transformed the coordinate of pixel of camera from the center camera to coordinate of robot and to coordinate of map. with my understand, with this method, the map will be understand position of object in the map coordinate like we transform pose of robot from base_link-> odom -> map, at this time, the map will be understand position and orientation of the robot in the map coordinate. Is that right ? . And in your situation, instead of coding from scratch the transforms matrix we can also use TF lib to transform it. Is that right ?

I have several videos in which I am using RealSense camera to estimate object position. I hope this video may help you. ruclips.net/video/oKaLyow7hWU/видео.html

Hi baha jouili! Thanks for watching my video! Yes, you can.

@@robotmania8896 okay thank you