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2021-03-26 06:23:02 -0500 received badge  Famous Question (source)
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2020-04-06 22:51:24 -0500 answered a question 'md5sum' object is changed automatically.

Thank you all for your interest in my question. I got a hint from you. So, arranging all advises, if scripts .srv are c

2020-03-31 05:05:00 -0500 commented question 'md5sum' object is changed automatically.

Hi, rossrv md5 <service_type> also works if the service_type is identity :).

2020-03-31 05:04:49 -0500 commented question 'md5sum' object is changed automatically.

Hi, rossrv md5 <service_type> also works :), if the service_type is identity

2020-03-31 05:04:02 -0500 commented question 'md5sum' object is changed automatically.

Hi, rossrv md5 <service_type> also works :)

2020-03-31 02:09:30 -0500 edited question 'md5sum' object is changed automatically.

'md5sum' object is changed automatically. Hi, I have a trouble with md5sum issue. I have built two packages in roscpp

2020-03-31 01:54:23 -0500 asked a question 'md5sum' object is changed automatically.

'md5sum' object is changed automatically. Hi, I have a trouble with md5sum issue. I have built two packages in roscpp

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2015-09-11 08:28:17 -0500 asked a question How c++ subscribes float64 message published from rosserial

Hi, I want to subscribe some data which is published from rosserial_arduino in cpp

I coded like this in sketch

std_msgs::Float64 vx_msg; 

ros::Publisher vx_pub("vx_msg", &vx_msg);

void setup() {

  nh.getHardware() -> setBaud(57600); 

  nh.initNode();

  nh.advertise(vx_pub);

}

void loop() {

  nh.spinOnce();

  vx_msg.data = 1; // publish linear velocity

  vx_pub.publish (&vx_msg);

}

This is for calculating odometry . As I can't use encoder, I have to publish constant velocity which I compute.

I can check that the message is published well because I can watch the data with ' $ rostopic echo'

so I coded with global function in .cpp file

##Like this

double vel_x;

void vx_odom (const vx_pub::vx_msg &vx_msg)

{

    vel_x = vx_msg.vx.msg.data;

}

There are tutorials about how to subscribe string message . But, I don't have idea if It is Float64 type.

What is the form of subsribing float 64 type data ?

2015-09-10 07:35:08 -0500 commented answer How to publish MAXON Encoder in EPOS2 70/10 for building "nav_msgs/Odometry"

what is 'motor_name' and how to know it etc..... I have tried many times . But, I couldn't find the way to use . Can you give me an advice how to get encoder ticks from epos2

2015-09-10 07:31:26 -0500 commented answer How to publish MAXON Encoder in EPOS2 70/10 for building "nav_msgs/Odometry"

Thanks for your answer. actually , I have not known about odometry well just except the way to check position. For now.... I wonder how to get my encoder's ticks from epos2 to compute the velocity.... I also search this pkg ' http://wiki.ros.org/epos_hardware ' but, I don't know how to use

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2015-09-10 01:54:36 -0500 asked a question How to publish MAXON Encoder in EPOS2 70/10 for building "nav_msgs/Odometry"

Hi, I'm learning ROS for graduating undergraduate course.

I am following this Tutorial ' http://wiki.ros.org/navigation/Tutori... ' to make mobile robot.

I already made teleoperation pkg , '/cmd_vel ', which spend the message to ' rosserial_arduino ' and

control motor with key_board button. And next step, I want to build navigation. So I heard I have to make

odometry and tf msg , which need a published 'Encoder data' .

I have two MAXON motor ; the two controllers are EPOS2 70/10 .

I have been googling how to publish encoder for using ' nav_msgs/Odometry ' but, I don't have idea .....

How to publish encoder data over ROS and subscribe it on using 'nav_msgs/Odometry'

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2015-05-31 01:38:04 -0500 asked a question Useing Rviz from Kinect v2 (xbox one)

Hi, Please understand me If you don't understand my poor English.

I'm begginer about Ros and I hope to use SLAM with depth cam , Kinect v2(xbox one) .

I have done to install ' libfreenect2 '(from: https://github.com/code-iai/iai_kinect2 ) and checked

camera data( Ir, depth, rpg) on commanding ./Protonect cpu.

after than, I follow step

$roscore 

$rosrun kinect2_bridge kinect2_bridge     ; maybe  to connect kinect2 with ROS 

$rosrun rviz rviz

and added checking list. but, There weren't any camera data in rviz .

I think I need to do more somthing like making kinect node ? ? to spend rviz? but anyway I don't know about this well.

What should I do?

2015-05-30 08:14:52 -0500 commented answer How can I use Kinect v2 with ROS in Ubuntu 14.04

with libfreenect2 in ubuntu is different running it. I think because maybe work with cpu not graphic card ?? is It right? or not?

after that. how can I use this data in ros rviz??? what is 'rosrun kinect2_bridge' for?

Sorry to I bother you , I need more your help

2015-05-30 08:11:17 -0500 commented answer How can I use Kinect v2 with ROS in Ubuntu 14.04

but, I have another question. When I used kinect2 with kinect2 SDK in windows 8.1 , The kinect2 device ran in turnning on inner fan and xbox mark was lighting

2015-05-30 08:06:00 -0500 commented answer How can I use Kinect v2 with ROS in Ubuntu 14.04

(2015-5-30) I understand what './Protonect' mean and I command in terminal $cd /libfreenect2/examples/protonect/bin after that ./Protonect cpu . than I could get screens(ir,depth,camera) .

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2015-05-29 13:06:36 -0500 commented answer How can I use Kinect v2 with ROS in Ubuntu 14.04

I also connected ' the robotstudio'? in facebook and there isn't your e-mail address . Mybe I can't see your address in this website

2015-05-29 12:00:56 -0500 commented answer How can I use Kinect v2 with ROS in Ubuntu 14.04

Uhm.... I can't find out your email-addr in your profile page. I can just only see your website and your name. Would you give me an e-mail to 'cheeryun@gmail.com ' . I take pictures and snap shots

2015-05-29 00:59:09 -0500 commented answer How can I use Kinect v2 with ROS in Ubuntu 14.04

Do I have to do this 'section 6 'Calibrate your sensor~' ? https://github.com/code-iai/iai_kinect2

2015-05-29 00:41:43 -0500 commented answer How can I use Kinect v2 with ROS in Ubuntu 14.04

If you don't mind, I want to show you my window screenshot in email..... I tried to upload screenshot.png but ' >5 point required ' ????? I don't understand.

I'm sorry to bother you.

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2015-05-29 00:35:33 -0500 commented answer How can I use Kinect v2 with ROS in Ubuntu 14.04

Uhm. I have changed power supply and command $rosrun kinect2_bridge kinect2_bridge .

when I do it , my terminal give a message, 'found 1 devices' . but In real, My device does not run in lighting. Am I following right ??? lol.