ROS and Raspberry Pi for Beginners | Tutorial #0 - Topics Packages RosMaster

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🤓 Check out my Course for beginners Zero to ROS: courses.schoolofros.com/cours...
ROS Tutorial for Beginners. Using ROS on a Raspberry Pi 3 for controlling a RC car through the keyboard on a Ubuntu Laptop
We will focus on:
- ROS kinetic installation on Ubuntu
- Raspberry Pi setup
- Installing a package
- Creating a package
- Messages and topics
** WATCH NEXT ONE: • How to Build and Launc...
*** SHOP NOW *********************
teespring.com/stores/geekmeup
** Sonar and obstacle avoidance: • ROS and SONARS for OBS...
*** Follow the whole series: • What is ROS (Robot Ope...
We will use a Raspberry Pi 3 on a Remotely Controlled car and use an Ubuntu laptop for controlling and programming.
👉 Want to use an Arduino in place of the i2c PWM adapter? Check out this video: • ROS and Arduino with R...
ROS Master runs on the Raspberry Pi board.
We will use SAMBA for haring the folders and develop our script in Python
******** TIME MARKS *******************
00:00 - Let's start
1:15 - Install ROS on Ubuntu
2:57 - RC Car: parts and setup
3:38 - Raspberry Pi setup
4:53 - Install servo control board package
5:40 - Package structure: messages and topics
7:15 - Topics: introduction and test on the car
10:12 - Python script for low level control
13:13 - First indoor test
13:48 - ROS_MASTER_URI setup
15:23 - Launch file
16:30 - Outdoor madness! complete test
******** SLOWER AND DETAILED HOW TOs *******************
- Build and Launch a Node: • How to Build and Launc...
- Topics and rqt_graph: • ROS Topics and RQT_GRA...
- Create a Publisher Node: • Create your First PUBL...
- Create a Subscriber Node: • SUBSCRIBER Node in ROS...
- Custom messages: • Custom MESSAGES in ROS...
******** FIND THE CODE *******************
- My code: github.com/tizianofiorenzani/...
- i2cpwm_board package: gitlab.com/bradanlane/ros-i2c...
******** ROS INSTALLATION *******************
- ROS Kinetic: wiki.ros.org/kinetic/Installation
- Raspberry Pi image: downloads.ubiquityrobotics.co...
****** DONKEY CAR PROJECT ******
www.donkeycar.com/
****** GET A CHEAP RC CAR (AMAZON AFFILIATE LINKS) ******
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****** RASPBERRY PI AND CAMERA (AMAZON AFFILIATE LINKS) ******
- Raspberry Pi 4 (4 GB RAM): amzn.to/36GqwXf
- Raspberry Pi 4 (2 GB RAM): amzn.to/2Aj7Pg3
- Raspberry Pi 3 Model B: amzn.to/2PwbMjn
- Raspberry Pi 3 Model B+: amzn.to/2PxkWfn
- Wide angle camera: amzn.to/2Pwc6P7
****** NVIDIA JATSON NANO (AMAZON AFFILIATE LINKS) ******
- NVIDIA Jetson Nano 2GB Developer Kit: amzn.to/3cyIZrW
- WiFi Adapter: amzn.to/3eDRl4u
- Arducam Module 8MP: amzn.to/3tjff9j
****** SERVOS (AMAZON AFFILIATE LINKS) ******
- Adafruit 16Ch Servo board: amzn.to/2LbxF7b
******** Visit my facebook page
/ tizianotutorials
** Go to my channel: goo.gl/BjLGnS
** Check out my latest video: goo.gl/ZhcNi4
** Check out my most popular video: goo.gl/5KMJnU

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3 авг 2024

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Комментарии : 330

@prandtlmayer 5 лет назад

Don't miss the other videos of the ROS Series: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-N6K2LWG2kRI.html

@noicthebrave 3 месяца назад

Thank you so much - because of this video, I was able to get my car up and running in no-time! While there's still some kinks on my end, just getting the thing working @ all was quite a task. Much Appreciated! TY! Edit: For those of you wondering, yes, simply buying the PWM board VS trying to make a work-around is definitely worth the price point. I personally got 2 of them from Amazon for ~$13-15 USD, definitely made the lower-level set-up process of this project go a lot smoother and allowed me to move onto higher-level things faster. (Thak you again for this video :) )

@nothanks7752 5 лет назад

oh thank god. I'm going through a ROS tutorial on skillshare, and the guy spent half an hour explaining what you covered in the first 3 minutes.

@prandtlmayer 5 лет назад

I love your comment. But it's hard to create the perfect tutorial. You can never please everyone. Follow the series and feel free to contribute with your suggestions

@nothanks7752 5 лет назад

@@prandtlmayer It's just something that I'm noticing a lot with skillshare classes. The instructor will drag out the "setup" instruction, also splitting it into multiple videos, so first glance at their class is "200 videos, 15hrs of content", but everything is drug out and inflated with marginally better content than free youtube tutorials.

@noeljohney6538 3 года назад

Thank you Tiziano for this video. I am using this video as a reference for studying ROS for the past 8 months almost every weekend. There is a lot of content in this video which was explained in just 18 minutes.

@prandtlmayer 3 года назад

A lot to absorb, I know. Hope this gives you a hint of how powerful of a tool ROS is

@CJsk8inHD 4 года назад

Great video man, direct and informative. I will definitely be stepping through this tutorial.

@prandtlmayer 4 года назад

This goes fast. Check out the others too!

@luqmansen 4 года назад

Nice tutorial, great example for my project, huge thanks !

@ShmeegleSon Год назад

Awesome, thank you for this series!

@tripleb5197 3 года назад

Excellent tutorial series. I'm using this to program a SunFounder PiCar-V with ROS. It uses a PCA9685 servo board to control the steering servo and a movable camera, and I was able control the camera and steering directly, but for the two DC motors, it connects to a TB6612 motor driver. Going to look for a DC motor driver to control them next. Thanks a lot!

@enlyse 5 лет назад

Cool content Tiziano! Keep it up! :)

@adarshgouda847 3 года назад

Great work with this video... keep up the good work... i'm watching this at 0.25 playback speed and still its hard to pause and catchup... would greatly appreciate it you could drop the pace in your future tutorials... again... great work!

@HaniSharif 4 года назад

Thank you.. really appreciate this❤️ keep teaching

@LucasSchulzeRobotics 5 лет назад

A tutorial about ROS Control would be very interesting.

@user-gv7nw9dj1w 4 года назад

Good tutorial! Thanks!

@TharinduIshan-tj2wr Год назад

Great video series. Thank you so much Tiziano

@junuhunuproductions 4 года назад

GREAT tutorial! and your code is really clean too!

@prandtlmayer 4 года назад

I am glad you find it useful. Robotics is awesome

@jscottmoelling7636 4 года назад

well done - thank you!!!

@tevereAR 5 лет назад

Hi Tiziano, thank you for your video series on Ros. It inspired me to start playing with it and gave me the basics. I'm trying to follow your tutorial but I have different hardware (rpi2, arduino and h bridge motor driver instead of escs, etc.) So it will take me a bit longer since I need to learn how to use rosserial and create my own packages from the beginning, but I think it is worth it. Keep up with the work, I really enjoy it. Ciao!

@ConsultingjoeOnline 2 года назад

Great video thanks!!!

@arsalanwasim4177 5 лет назад

Salam and thanks for the tutorial

@quentinwiame9344 Год назад

Thanks bro for your help ! PS : We are french

@marcofe82 4 года назад

Ciao Tiziano, gran video e grandissima pronuncia! Mi sa che diventeremo presto amici :)

@prandtlmayer 4 года назад

Ottimo, segui anche le "due chiacchiere con gli sviluppatori"

@harithdeshan6607 3 года назад

Great stuff

@prandtlmayer 5 лет назад

I know guys that for a beginner the video is a little too fast. The purpose was to get things ready and have a general flavor of what's the series about. In the next video we'll go back to the main concepts and introduce a few more tools.

@mfatihozkan3503 3 года назад

Hello Mr. Tiziano. I am trying to use rpi camera with ros melodic. How can i use kinetic packages with melodic. Can you help me ?

@narpat007 5 лет назад

It was really awesome !, if possible pls use gaming joystick to control the car and in your further testing pls include object recognition and collision avoidance using OpenCV.

@prandtlmayer 5 лет назад

That's the plan

@crisdeodates 5 лет назад

A very informative tutorial series by Tiziano. This will help in easily understanding the concepts of implementing real-world robotics applications in ROS. Expecting much more in the upcoming videos. You never let us down and is an inspiration 🙂

@prandtlmayer 5 лет назад

Thanks for your words. That has been a tough one

@sainco3036 5 лет назад

thank you.

@diegocamilopenaramirez6101 5 лет назад

Thanks you

@rbrobots6871 3 года назад

Thank you very much. I found this very useful :)

@johnstreety6682 3 года назад

Did you get yours to run? I seem to be having a problem with the i2c chip. I have tried two different brands. Both work with the donkey car software but not ROS.I did get one of them to steer with ROS, but not the dc motor I am guessing it has to be the real deal, from Adafuit to work with ROS

@rbrobots6871 3 года назад

@@johnstreety6682 Yes I did, I'm not using the donkey car, but my own robot I've made with raspberry pi. I was also having a problem with the i2c, but this library worked well for me: gitlab.com/bradanlane/ros-i2cpwmboard. I am using the PCA9685 driver connected to SDA and SLC in RPI GPIO headers. I'm using it to control 2 mini servos. If you use the command 'sudo i2cdetect -y 1' you should see x040 and x070. I used following commands after catkin_make and running the necessary installations from this video. * rosrun i2cpwm_board i2cpwm_board * rostopic pub /servos_absolute i2cpwm_board/ServoArray "servos: - servo:2 value 200" It looks to me like the values from 0 to 360 work for me, but I need to look further into it. [I checked and my range is 160-500] I did have a few problems initially where I wasn't seeing any movement, but after charging my batteries and checking the connections a few times, it worked fine.

@prandtlmayer 3 года назад

Sorry for that. In reality you could skip the entire i2c device and control the servo directly from 2 GPIOs of the Raspberry Pi using a packet like servoblaster. You'd need toy write your own node and a little bit of rewiring

@dhvanitdesai1044 5 лет назад

will you do a series for mavros like you did for dronekit ??

@CodingScientist 3 года назад

This is FANTASTIC Tutorial, it would be helpful if you could show the circuit / pin level diagram to build the Robot, each pins connecting which components etc

@prandtlmayer 3 года назад

Noted

@boardsdiscovery5803 5 лет назад

Speed Light is great for me :) I don't like wasting time in not so important details. Nel video all'inizio non capivo l'assenza del driver per i motori cc. Poi ho scoperto che il motore per la trazione è un brushless! ora tutto è chiaro. Bello stile. Complimenti.

@prandtlmayer 5 лет назад

Nel prossimo aggiungeremo i sonar

@boardsdiscovery5803 5 лет назад

intendevo dire che le lezioni veloci mi piacciono :)

@prandtlmayer 5 лет назад

Avevo capito. Sono stato troppo succinto nella risposta. Volevo dire, che il prossimo video sarà veloce perché aggiungeremo i sonar e spiegherò il tutto molto velocemente. Anche a me piacciono video veloci

@pradiptabiswas2393 5 лет назад

Loved your first tutorial. I have a Redbot and an Adafruit I2C motor control board lying around at home. Can I use that for this whole tutorial? It uses two DC motor. Will it be complicated to uses DC motor instead of a servo motor to follow your tutorial? Thank you.

@saviopullkotil2270 Год назад

Hello, great explaination! I had a doubt, in my robot car i want to control the 4 dc motors (2 on each side) and there is no servo. We want to use a differential drive kind of motion to take a turn so how should i change the processes here?

@Brain_Robotics 5 лет назад

Great Video! I hope to see more of these!!!

@prandtlmayer 5 лет назад

Sure. The next will cover debugging tools like rqt

@ajelvani 4 года назад

#0? A true computer scientist

@omerfeyyazselcuk7325 4 года назад

That wears like mad physicist.

@MattCoOST 2 года назад

I love your voice

@NexxuSix 4 года назад

Tiziano, First and foremost, thank you for this wonderful tutorial! About three years ago, I tried working with ROS, using just the Wiki Tutorial, but didn’t fully understand how ROS worked, let alone, how to drive a single servo. Although your tutorial was a bit fast, and took me several tries sometimes to get things right, tonight I am proud to say I have a Raspberry Pi 4 with a Servo Hat operating two servos via SSH from my tablet! This is a really big step for me! So, next I plan to put the assembly on a car as you suggest, and keep working with the tutorials. One question though: In the tutorial you install ROS on both Ubuntu laptop, and Raspberry Pi, but in the end of the tutorial I understand that the Donkey Car can be controlled through SSH alone, from any tablet. What does the ROS installation on the laptop do for the Donkey Car? Thank you for answering my question!

@prandtlmayer 4 года назад

Thank you for your words. Great question: the reason why I went to the trouble of using the laptop too is because I want to show how to make Ros work in a network. This is a tutorial and the idea is that, in general, you have multiple computers and robots connected together

@azouaousmile 4 года назад

Really nice video. Thank you so much for uploading it. I was wondering what version of Ubuntu are you using on your laptop?

@prandtlmayer 4 года назад

Lts 16.04

@azouaousmile 4 года назад

@@prandtlmayer thanks 👍👍👍

@cooldude6651 4 года назад

Hi, I'm a new ROS developer and I love these tutorials. I was just getting started with ROS2, and I was wondering if there was any form of ROS2 tutorial series coming down the road. Most documentation I've found was either vague or vague but in C++, but you're very good at explaining the code.

@prandtlmayer 4 года назад

Not planning for that right now, but maybe in the future.

@Flix-f6q 3 года назад

please send a link here to the vague documentation in C++. Thanks.

@benaliamima9903 4 года назад

Hi Tiziano, thank you for your videos on ROS. I want to know how to control DC motor not servo motor using the i2c pwm board package to drive the car forward and backward

@prandtlmayer 4 года назад

You need a DC motor driver, and most of them accept pwm input.

@haziqahmad6802 5 лет назад

Thanks, I like your video. Can you create a video tutorial about how to connect ROS + Raspberry Pi 3 + LiDAR + motor control. I like to build an autonomous RC car using LiDAR.

@prandtlmayer 5 лет назад

Now that is on the line. We are going to have some fun with sonar pretty soon also

@GurusCooking 3 года назад

awesome, even i was thinking of asking @Tiziano Fiorenzani to do this video, would be of much help he's a great teacher

@jamespowell7231 5 лет назад

This tutorials will be easy to follow......jumps into hyper-drive.

@prandtlmayer 5 лет назад

And yet it turned into a 20 minutes video. But don't worry, the next episodes go back to everything I explain here and are much slower

@jamespowell7231 5 лет назад

@@prandtlmayer:-) I'm trying to pull what I can to get a motor controller working.

@prandtlmayer 5 лет назад

Feel free to publish your projects on my FB page and share your pain there

@benjamingp7442 3 года назад

Great video! I have this all working on a 4x4 motor bot and using rostopic pub -1 /servos_absolute i2cpwm_board/ServoArray "{servos:[{servo: 1, value: 1000}]}" works. My motors are 1,3,5 and 7. What I can't work out is how to make them run in reverse!

@prandtlmayer 3 года назад

Nice work! Reverse depends on the motor controller. Usually a reverse command makes the controller to enter a brake, while reversing twice enters the actual reverse

@garapatianushadevi3427 2 года назад

Just loved them! :) Can you please help me with this: If my motor control board has PWM interface, (not I2C), what are the changes to be made in low-level RC car code?

@prandtlmayer 2 года назад

Create a node that interfaces with your specific motor. This is you first step. Then the donkey low level control publish a topic that your new node subscribes to

@benaliamima9903 4 года назад

Hi Tiziano, thanks for the awesome tutorial I want to know if i can implement this with my PiCar of sunfounder ?

@prandtlmayer 4 года назад

I believe so, just some modifications to the actuators and you should be fine

@benaliamima9903 4 года назад

@@prandtlmayer thank you

@hfe1833 4 года назад

Thanks for the video tutorial, whats the advantages of using ROS because i dont use it before i have similar project but not using ROS??

@prandtlmayer 4 года назад

ROS Is a standard in today's robotics. If you want you can use your own libraries, you just need to write everything from scratch, communication, navigation, control...

@KanagachidambaresanGR Год назад

Hi.,. please post tutorial for robo car control with rp-lidar

@anukeshambatkar6255 5 лет назад

sir how can we make a user follower robot using raspberry pi and camera for shopping purpose

@erhanwarsi2185 2 года назад

Brilliant sir wonderful but in my 3 dof robotic arm there are two servo,s i am not aware from python script please sir can you help me?

@gzizouhassine5777 5 лет назад

Can you make video on autonomous drone based on open cv, dronekit, neural network, ros plz

@prandtlmayer 5 лет назад

step by step we'll get there

@doominicbaril 5 лет назад

Very nice video! I will follow this series with passion. I would also appreciate if you split this video into detailed parts of the tutorial. I got stuck at the ssh login part on the raspberry pi as I cannot access the internet with it to download the necessary files. Both my computer's and pi's connection are busy to perform the ssh login.

@prandtlmayer 5 лет назад

That is exactly what I made going to do!

@prandtlmayer 5 лет назад

Ssh is pretty straightforward. I just connected the pi with an Ethernet cable to the router, the same you connect with the computer. Than in Windows you can use putty, in Linux you just type ssh username@ipaddress . I use the .local hostname so you don't need to know the ip address. For a norma Raspberry Pi with raspbian the default would be ssh pi@raspberrypi.local with password raspberry

@doominicbaril 5 лет назад

@@prandtlmayer Thanks for this answer! I am once again stuck. I created a low_level_control.py file in my donkey_lld directory. I have tried to compile it using catkin_make but I cannot seem to run it using the rosrun _llc_low_level_control.py command. I get the "Couldn't find executable named low_level_control.py" error. The command "rosrun i2cpwm_board i2cpwm_board" runs fine though.

@doominicbaril 5 лет назад

For the file, I created a file named low_level_control.py and copy/pasted those contents in it : github.com/tizianofiorenzani/ros_tutorials/blob/master/donkey_car/src/low_level_control.py

@doominicbaril 5 лет назад

I see that you seem to cover this in your next video. Forget my question, I will probably understand better after the next video!

@benaliamima9903 4 года назад

Really appreciate your videos. Thank you Mr. Tiziano I can't drive my Picar-s using your code. i have one servo motor that control the front wheels (1) and two DC motors for rear wheels (servo =5 for the left wheel and 6 for the right). when i run your low_level_control.py code only i can control the front wheel by servo 1. but the two rear wheel did not move. I have 3 servo in my case and when i modify your id steering from 2 to 5 the left wheel move normally but the right one doesn't. What should i do to control the car as you. i hope that you reply me.

@prandtlmayer 4 года назад

That has nothing to do with ROS: It simply is a matter of mapping the controls to your own actuators. Create a simple script for yourself where you test the servos to understand how to map them

@jonathansteele7349 4 года назад

Great Tutorial Tiziano. Did you ever have the error that the servo works and changes the stering angle but the throtle motor does not ? Do you have any troble shooting sugestions ? I used the rostopic pub /cmd_vel geometry__msgs/Twist "linear: X 1.0 and then echo the servos_absolute msgs show servos 1 value is 378. Thank you for your time Tiziano or if anyone else had this problem I would appreciate the help.

@prandtlmayer 4 года назад

That is weird, tell me more about it. I would first try to see whether just applying a pwm (that you can generate either through the servo board or using some external source)

@fulvian 5 лет назад

ciao tiziano! grazie sempre per i tuoi video : ) sto seguendo il tuo tutorial per recuperare una vecchia auto rc kyosho 1-10 (è talmente vintage che come "esc" ha un normalissimo servo con squadretta + braccetto che fa ruotare un regolatore a resistenza variabile). vorrei fare un po di pratica con ROS per poi provare a fare un tracked. speriamo bene...

@fulvian 5 лет назад

Scusa Tiziano, potresti dirmi a quali gpio della Raspberry hai collegato la i2cpwm board? Dal video non è chiarissimo e in giro ho trovato diversi schemi di collegamento. Grazie Fulvio

@prandtlmayer 5 лет назад

Io mi riferisco sempre a questo: cdn.sparkfun.com/assets/learn_tutorials/4/2/4/header_pinout.jpg

@prandtlmayer 5 лет назад

i2c sono pin 3 (SDA) e pin 5 (SCL)

@thebeatgeek1 4 года назад

Thank you for creating this tutorial it was super helpful. I was able to follow you video, but I at the point where you create the low_level_control.py file and I do not know how you created that file and where you put it. I thought I put it in the catkin_ws/src/donkey_llc location but ros says that the file is not executable.

@squirrelbrains2197 4 года назад

Did you tell your Raspi that this file can be executed? To do so, navigate to the folder of your file than type "chmod +x low_level_control.py " into the terminal (without parenthesis).

@user-tn4io6hj2b 4 года назад

It was a really good lecture. And can you also teach using Jetson Nano? Or can I try the lessons with Jetson?

@prandtlmayer 4 года назад

Most of the things I showed apply to any Linux board

@ikhtiyor 4 года назад

is ping working ?

@co4erol 2 года назад

4:28 small typos fix. He write [catckin_ws_src] instead of [catkin_ws_src]

@antoniovigoni4312 5 лет назад

Very nice video, but you go too fast for me :) Thanks for your tutorials. Ti seguo ;)

@prandtlmayer 5 лет назад

Thanks, the thing is I wanted to cover the full thing in less than 20 minutes. Otherwise it gets too long. But in the next video I will go back and cover some basics again

@Jiceism 5 лет назад

Hi Tiziano, thanks for these videos! Quick question before I wipe my computer. I am using Ubuntu 18.04, and ROS isn't supported on this version :( Anychance I can use 18.04 with another ROS distribution?

@prandtlmayer 5 лет назад

Sure, you can use latest versions of Ros. My examples are pretty basics and you should be able to transfer the coding and knowledge to any other distribution, like Melodic. Try and post here your results. Or better on my Facebook page @tizianotutorials

@prandtlmayer 5 лет назад

Check this out: answers.ros.org/question/76279/different-ros-versions-on-multiple-machines/

@Jiceism 5 лет назад

@@prandtlmayer Thanks for your reactivity! I will check out as soon as I have some time and post results here and in Facebook page too!

@prandtlmayer 5 лет назад

That's a very interesting question

@Jiceism 5 лет назад

Hi @@prandtlmayer , so I took time to go over minor HW issues, and I can confirm using Melodic on my desktop works without any issue with the Donkeycar!

@johanthps9647 4 года назад

can we get the schematic diagram on which pins should we connect the servo control board to?

@prandtlmayer 4 года назад

I am pretty sure I show them in the video. You can always refer to the official RPi pinout page: www.raspberrypi.org/documentation/usage/gpio/

@ozcankosar6206 Год назад

Does the ros-i2cpwmboard package support ROS Melodic? Will it work if I just install donkey_car and ros-i2cpwmboard on a Jetson TX2 with ROS Melodice?

@prandtlmayer Год назад

I don't know. If you don't find it when you try to install you can either build it from source or you can ditch the i2c servo adapter and use an Arduino

@fransflorenza9708 2 года назад

can someone help me pls? i have an error while install servo package. the line said: FATAL error i2c/smbus.h: no such file or directory. note: im already install the i2c library and success...

@hosseins5179 2 года назад

Hello. Thanks for good tutorial. Can I install ROS on raspberry pi 2+?

@prandtlmayer 2 года назад

The question is whether you can install Ubuntu. Check where I source my SD card from to see if they have an image ready

@priyanshugupta8552 Месяц назад

can i use ros noetic instead?

@ypm7369 3 года назад

please make a tutorial of how to control the same robot car with ROS kinetic and hand gestures !!!

@johnstreety642 3 года назад

Did you have any trouble getting you DK to move with ROS?

@MikeNewham 5 лет назад

Hey folks, My RC Car (a Tamiya TT-01 Type E) chassis is going 'toooo fast' when I control it with the keyboard :) I wonder if a parameter needs to be adjusted in 'class ServoConvert ():' within 'low_level_control.py' (as seen at 10:56) Should 'range=90' be increased? Or maybe the PWM frequency should be lowered (where would that setting be?). - When running the 'telex-twist-keyboard-node' - the Tamiya accelerates quickly from 'stationary' after pressing 'forward - I'. I then have to hit 'z' key instantly to 'decrease' speed multiple times. - Also, reverse does not work from 'stationary' after pressing 'reverse - '). I have to increase 'reverse' speed by hitting the Z key multiple times to get the Tamiya moving backwards. - I found a centre-value of 298 to be best for 'stationary' between both servos fro steering and throttle.

@prandtlmayer 5 лет назад

The center value needs to be calibrated. You might want to write a script for that or a parameters file. In the file you could also set the values for saturating your commands. I wouldn't limited the servo range, but the commanded speed. For the reverse, that is true and it depends from the motor controller. You need to go back for the break, theen idle , then back again for backing up. Try also to incorporate the joystick rather than the keyboard

@sangeethcp2119 Год назад

Sir can u help me to get noetic operating system code for above robotic project ..

@xHnTRxCLan 3 года назад

Hi Tiziano, thanks for the great tutorial ! I followed everything you did in the video, but at 14:40 I got this error " Command 'rostopic' not found," I checked the ubiquityrobotics's website and I found that they only supports Ubuntu 16.04, and I'm using Ubuntu 20.04. So is there any possible way I can make this work in the version I'm using ?

@prandtlmayer 3 года назад

did you source?

@wesleybatista4024 3 года назад

when I compile "catkin_make" the following error appears: "error:‘ i2c_smbus_read_byte_data ’was not declared in this scope oldmode = i2c_smbus_read_byte_data (_controller_io_handle, __MODE1); " can anybody help me ?

@patrickpuentelml4958 Год назад

Hi Tiziano. I have a question because at the moment ROS had new distros called Noetic & Melodic. So, in this nice tutorial you are using ROS KINETIC an old distro. As a fully beginner (dummy) of ROS which of the new distros is the equivalen of KINETIC? and What's the difference between Noetic & Melodic distros?. At the moment I'm learning all the basic thing of ROS with Noetic and I need clear my mind when robot devoloper use Noetic, Melodic or Kinetic. HELP PLEASE!

@prandtlmayer Год назад

No problem. For many uses there is not much difference and it depends on your operating system. As I had to use Ubuntu 16, the only choice was Kinetic. But if you use a more modern release then you use the ROS distro that installs on your OS. You should be able to learn and port your packages among distros

@rouinisami3427 3 года назад

i will use control L298N Driver with ROS but i don't find the node of L298N driver on github

@johnstreety6682 3 года назад

I have followed your tutorial all the way up to the part where you get the wheels to move. When I run it, I get no errors but the wheels don't move. I thought it might be the batteries or some other hardware issue. So I reinstalled the Donky car software and ran the calibration for 3 hours last night(mainly to make sure the battery was good). I guess I was thinking something might have changed since you made this video. However, I did use the most recent version of of ubiquity which was 2020-11-07-ubiquity-xenial-lxde. Can you think of anything that might cause this odd scenario?

@prandtlmayer 3 года назад

Let's break the problem into pieces. First: do the motor spin when you use the normal radio receiver?

@johnstreety6682 3 года назад

@@prandtlmayer I got the wheels to move using the donkey car software. I am thinking it may have something to do with a Chinese version of the pca9685. I ran into that with Arduino and some other chips

@ruveydadilara 18 дней назад

How did you install ros2 on raspberry pi 5?

@sujitmahadik2297 5 лет назад

Plz Can you make video on Autonomous car based on neural networks and open cv

@prandtlmayer 5 лет назад

Sure... In time

@bijayanbhattarai8671 5 лет назад

@@prandtlmayer i need Autonomous car based on neural networks and open cv too

@prasannamg2449 3 года назад

Hi, I receive a no smbus.h error during catkin make. I have installed the libi2c-dev package,however i am unable to locate the i2c folder in the root directories. I searched for available solutions but the servocontrol package as mentioned had all the requisites....... Could you let me know which version of Ubiquity iso you had used here? Ill try with that OS version........or maybe an alternative help would do.I could locate smbus files but all were python related...No smbus.h

@jcmay 3 года назад

i have the same problem

@leidydanielagomezsilva3286 4 года назад

hello your video is very interesting, you can say the references of the components you used. thank you

@prandtlmayer 4 года назад

I think I wrote all in the description. Check it out

@duckietown2447 4 года назад

Appreciate this tuorial. So we installed melodic and when we source /opt/ros/melodic/setup.bash . An error occured:: /opt/ros/melodic/setup.bash:.:8: no such file or directory: /home/badz41/setup.sh We would appreciate your help

@squirrelbrains2197 4 года назад

What directory where you in when you typed that? If you still have this issue, you may want to try to type "cd" first to go to your home directory and than try again.

@SrijitoGhosh Год назад

Hello sir. I know, it's a bit late. I mean, its 4 years since the upload of this video but may you please answer my question, if I can use WSL for installing ros packages?

@trylatdar4012 4 года назад

can you explain how to acces robot folders using samba plz ? beacause I can't acces it directly on my laptop like youy did. I'm on ubuntu 18.04 for the laptop and the robot is on the latest image onthe the website you link to us. Thanks

@prandtlmayer 4 года назад

You need to install and setup samba on raspberry pi. It should already be included in Linux

@divyaprakashbiswas8781 3 года назад

Sir, thank you for sharing this video. What editor are you using to edit the donkey_llc.py at 10:50, because you have ssh into raspberry pi?

@prandtlmayer 3 года назад

PyCharm

@atrocious00 3 года назад

May I ask what the reasoning for the steering being set to z axis?

@prandtlmayer 3 года назад

standard robotics frame: x: right, y: forward, z: up

@narendrashiva9360 3 года назад

Will it work on different networks? Means can we control it wherever we r in the world?

@prandtlmayer 2 года назад

Yes, you just need to make sure it is reachable from you. Check on the Ros forum

@ozcankosar6206 Год назад

Hello . I want to control it with my own python code. do you have source code?

@kartiksinghal810 3 года назад

I am getting an issue with the i2c when using PCA9685 driver. the Arduino IDE is able to detect the i2c connection but it is not accessible from i2cdetect in the terminal. [ROS Melodic on Ubuntu 18.04 in VM] Any leads?

@prandtlmayer 3 года назад

I have not tested on melodic but I don't think that is the issue. Not a clue, sorry

@AsimNaskar 2 года назад

Very detail. But still could not understand how the Pi board is receiving Transmitter signal? Have I missed that part?

@prandtlmayer 2 года назад

The only commands that are coming to the pi are from wifi. The receiver has been disconnected. I actually have a video now that shows how to integrate the receiver with an Arduino

@mfatihozkan3503 3 года назад

Hello Mr. Tiziano. I am trying to use rpi camera with ros melodic. How can i use kinetic packages with melodic. Can you help me ?

@prandtlmayer 3 года назад

In theory you should be able to, as long as you have one roscore. What kind of problem you have?

@arsalanwasim4177 5 лет назад

Sir, what steps should i follow for dc geared motor?

@prandtlmayer 5 лет назад

What do you have in mind?

@arsalanwasim4177 5 лет назад

@@prandtlmayer Salam respectable sir, instead of using servo motors, i want to implement this using dc motors using l298 motor driver to control motors,I have understood the procedure but what should i do to change the libraries of servo to dc ?

@prandtlmayer 5 лет назад

You just need to replace the driver for controlling your DC motors. Write a library that controls the DC motors, that gets reference input. Then you ROSsify it following my next tutorials

@arsalanwasim4177 5 лет назад

@@prandtlmayer thank you so much ,i'm new to the rasberry , that's i didn't understand, you truly rock one request though please post a video with gmapping as well

@ChoupyPeluche 4 года назад

Hey mate ! your tutorial is awesome but EVERY step got me tons of problems haha. I managed to overcome every problem but I'm totally facing a wall right now... I don't know why but when I do the "rosrun i2cpwm.... i2cpwm...." part, I get fatal messages saying it's not possible to connect to the i2c-1 thing. But when I check i2cdetect -y 1 on the system I get the good response with the connected pins. So I'm not sure why it wouldn't connect (I'm using rpi4). If you have any answer I'd be glad to read it because I have really no idea :( . The i2c works because I tested the system with raspbian and basic donkey tutorial got my motors running.

@prandtlmayer 4 года назад

I haven't tried on a Pi4 but I'm sure it's the same as my 3. Try and use one of their python test scripts

@fransflorenza9708 2 года назад

hi, i get the same problem too, have you solved this problem?

@fransflorenza9708 2 года назад

solved by execute as super user

@taichi-maker2207 4 года назад

Hi Tiziano, Thanks for your tutorial. However, I have a problem compiling ros-i2cpwmboard. I tried this both on the ubiquity ubuntu ros bundle which is mentioned in your video. I also tried this on my own ROS RPI3B build. My setup is ROS Melodic + Ubuntu 1804. I have no problem compiling other pacakage I created on my RPI ROS enviroment. The compiling error message is very long so I am just pasting the bottom line of the erro messages which is as the following " make[1]: *** [ros-i2cpwmboard/CMakeFiles/i2cpwm_board.dir/all] Error 2 Makefile:140: recipe for target 'all' failed " I am just hoping your or someone could tell me why I could not get it comiled like your video. Thanks!

@prandtlmayer 4 года назад

Did you download the package from my repo?

@MrArdo-branch-main 4 года назад

this is great but i cant find the right pin on the motors. can someone help me where to find the pin?

@prandtlmayer 4 года назад

What pin do you refer to?

@MrArdo-branch-main 4 года назад

@@prandtlmayer haha it's ok.. I get the pin😅😅 that motor driver.. thank you for replying my questions 🙏🙏

@henryantonioquispepizarro2291 4 года назад

Now, i'm using ROS Melodic. If i want to development this project, Is it necesary to change MELODIC to KINETIC?

@prandtlmayer 4 года назад

Packages are ROS distribution dependent. ROS distro also depends on the Linux version. Check the wiki page of the packages you want to verify whether they are available or not.

@ozcankosar5416 Год назад

My car has a hard time going backwards. where do i change the values?

@prandtlmayer Год назад

Usually you need to command back for the break and back again for actually backing out

@enricosaccheggiani3192 4 года назад

Hello Tiziano , I have created a robot car from 0 but the raspberry PI uses Raspbian. Do you think that is possible to run ROS on a Raspbian platform ? Thanks

@prandtlmayer 4 года назад

Use Ubuntu and save yourself frustration in installing Ros

@marcochunab4082 4 года назад

hi, Tiziano i got a question. I try to run the i2cpwm_board but i got an error, it says that ros couldnt find executable named i2cpwm_board

@prandtlmayer 4 года назад

Chmod that

@marcochunab4082 4 года назад

@@prandtlmayer hi thanks Tiziano, i solved that already but Noe the cmake got am error because of the library of i2c

@tuantrananh2967 5 лет назад

I am having trouble sharing folders from ubiquityrobot (rasp pi) with ubuntu 16.04. I tried many ways but was not successful. Please help me. thank you!

@prandtlmayer 5 лет назад

I had no problem with that. Did you set the password with smbpsswd?

@denq1016 3 года назад

How did you install ROS in raspberry ? Do use ubuntu or raspbian in raspberry ?

@prandtlmayer 3 года назад

I did not, I used a pre baked image

@joshtradesict 4 года назад

Hi ,I'm new to Autonomy and Computer vision robotics cause i only used arduino and raspberry pi.....What is the difference between these Ubuntu, ROS, openCV, MATLAB...do i need all this to make a robot??

@prandtlmayer 4 года назад

Those are just tools. You need passion and some background on math, coding and robotics. Ubuntu is an operating system, like windows. Matlab is a program specific for math and matrix computation. Ros is a suite of libraries for simplifying putting together robots and sensors

@squirrelbrains2197 4 года назад

Ubuntu is a Linux based operating system. It is best suited for running ROS, the Robot operating system. Robotics is a big field that offers a lot of things for you to learn. You do not have to become a specialist in everything that you just mentioned. Learning to code is very help full though.

@edwin221b 5 лет назад

I had a problem while installing samba, it gives me the error “samba has no installation candidate” How could I solve this?

@prandtlmayer 5 лет назад

Now that is weird. What version of Linux do you have?

@marcosmit97 3 года назад

rosrun i2cpwm_board ? Where do I get this file

@embedded_system 4 года назад

Sir I don't have extra monitor for raspberry pi, can I access by by using ssh and realvnc permanently? I can access pi only first boot. After shutdown on of system .I can't access pi ? What's the problem?

@prandtlmayer 4 года назад

Sure you can, follow my tutorial

@embedded_system 4 года назад

@@prandtlmayer thanks