VEGETA's profile - activity

so you think the custom robots like turtle bot or jakal or any others.... do you think they put motor control in a separate mcu than the ros one?

btw, do they use raspberry pi or their own hardware? I didn't see a source for designing custom hardware to run ubuntu and ros on the internet.

my interest is to learn how to make a totally custom board that is capable of running ros? i mean, make packages and drivers for it too... do you have a clue about it? thanks

thanks for the info!

can I use 2 or more Kinects to build and update one map (by any method) using octomap? this is to put 3 kinects to cover one big area to continuously monitor moving objects and identify them as dynamic obstacles.

My robot is not 2 wheels but it is 4 wheels... is that still diff drive or is it skid drive?

I've seen that using 4 wheels instead of 2 (which is what I want) is now called skid-steering! what to do now? should I modify the diff drive code for this?

so I only need a wheel incremental encoder to count pulses, then convert them into speed. after that apply it on the kinematics equations to get x,y,theta? are x,y,theta the only required parameters?

so just this short amount of code is necessary? then use rosserial to send it to navigation packages?

I read somewhere here that there is a ready-to-use differential drive driver software... do you know about it?

OK, I will use a 4-wheeled robot with diff drive... how to write the driver for it? assuming pi3 or pir3+arduino as control boards? what will change here since you used it before?

well, i am a noob myself so i will try to answer. 1- what are the final values to be sent from the robot to ROS as odometry? like x or y... 2- how to get them or calculate them for diff-drive or car-like robot? 3- how to send/receive movement commands and convert them to readable values?

thanks!

nice help there, I thought of using Arduino but I guess Raspberry Pi 3 is going to be used as main controller with ROS so why not just use it directly?

my question is how to calculate odometry? what are the required values and so on?

it is better if there is an example.

thanks!

I want to make a custom robot and my problem is publishing odometry values. I have and Ackermann steering car robot, but I read that it is hard to integrate that in ROS.

Thus, I switched to this one: http://mikroelectron.com/Product/4WD-...

As you see, it is a 4WD differential drive robot chassis with wheel encoders. I've read about this package here: http://wiki.ros.org/diff_drive_contro...

but I don't know if it is a "driver" or not. Can you help me in this? I just want to integrate such a robot with ROS in order to do other stuff that I want which will include using Kinect and stuff... so getting accurate poses are essential.

I looked for ready solutions like Jakal but their price is simply insane!

thanks!

so what are the required values to be sent to ROS master as odometry?

can you send me pics or info about ur design and how u did it? TY

good info, thanks.

can you give me an example of this kinematic equation? say for differential drive since it is easy.

and how to make an inverse like you explained.

thanks

I spam the forum? I didn't intend to if you think I am spamming it. I just post questions that I didn't find answer to within my search.

I am sorry for trouble.

you seem to be an expert. tell me how did you learn catia? what is the benefit of connecting it with ROS?

thanks!

Hi,

is there a way to identify a moving object (regardless if it is a human or a ball...) and estimate its position in a 2d or 3d map? I ask because I want to detect dynamic obstacles in order to make a plan adjustment for autonomous robots.

I saw pointcloud library but never tried it. can these methods be integrated with rtab-slam for example? in order to add these dynamic obstacles to the global map.

thanks!

no one knows?!

so you design a robot via catia? please tell me about your work.

what? do you use ROS with CATIA? how?

i would like to know how to use this to detect dynamic targets

can someone answer this? xD

I was hoping for a ROS solution. how about you use Arduino to control motors and send odometry back to ROS?

hi

I want to make a car-like robot with steering wheels in front as you well know. the problem is modeling it and using it with navigation stack successfully!

My solution is: use arduino! yes get commands from ros (which ones exactly?) then send them via rosserial to arduino and then process them and move the robot... then output odometry values.

how to output such odometry values back to ros? is it gonna be easy? or should i consider differential 4 wheel drive (point me where)?

thanks

please tell me what u did

please tell me if you did anything useful

I am a beginner in ROS, but I read lots of docs these days in order to construct a plan for my research. What I plan to do is the following:

• use Kinect to get 3d map data.
• use octomap to build the 3d map or any other package.
• use rtap-map to do slam and stuff...

^ I can change these packages if required.

now, I still need these:

• let the robot navigate, I guess this is via navigation stack which I still don't know how to use.
• track all robots' (multi-robot) positions and simulate them in the map.
• detect dynamic obstacles and change movement plan to avoid them. < which is the most important part of this!

please help and tell me what packages and ways to do that. any suggestion is accepted.

thanks!