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2019-04-12 08:41:39 -0500 edited question Show in RViZ coordinate of a point with respect to parent

Show in RViZ coordinate of a point with respect to parent Hi to all, in my RViZ I visualized two sensors, where each on

2019-04-12 08:41:03 -0500 commented question Show in RViZ coordinate of a point with respect to parent

@lucasw, i added new information. Hope it helps.

2019-04-12 08:40:38 -0500 edited question Show in RViZ coordinate of a point with respect to parent

Show in RViZ coordinate of a point with respect to parent Hi to all, in my RViZ I visualized two sensors, where each on

2019-04-12 08:35:38 -0500 edited question Show in RViZ coordinate of a point with respect to parent

Show in RViZ coordinate of a point with respect to parent Hi to all, in my RViZ I visualized two sensors, where each on

2019-04-11 23:44:20 -0500 commented question Show in RViZ coordinate of a point with respect to parent

@lucasw, do you mean simply adding type=fix?

2019-04-11 22:45:33 -0500 commented question Show in RViZ coordinate of a point with respect to parent

@lucasw, you mean adding type=fix?

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2019-04-11 12:49:23 -0500 asked a question Show in RViZ coordinate of a point with respect to parent

Show in RViZ coordinate of a point with respect to parent Hi to all, in my RViZ I visualized two sensors, where each on

2019-04-11 12:49:21 -0500 asked a question Show in RViZ coordinate of a point with respect to parent

Show in RViZ coordinate of a point with respect to parent Hi to all, in my RViZ I visualized two sensors, where each on

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2019-03-12 15:01:23 -0500 commented answer Dependencies tree of ros launschs

I tried roslaunch_to_dot, but it seems it does not evaluate "$(eval...)", which i have. Concerning rqt_launch, i tired

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2019-03-12 13:05:37 -0500 asked a question Dependencies tree of ros launschs

Dependencies tree of ros launschs For the transparency I would like to find the relation which ros launch file call the

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2019-03-08 00:15:05 -0500 asked a question Log and interpreted CAN messages at the same time

Log and interpreted CAN messages at the same time I have CAN Network which i would like to interpreted one of the CAN ID

2018-11-14 15:14:42 -0500 marked best answer The meaning of the frequency value in rosbags

Dear all,

i downloaded a rosbag from the internet and looked at the info of this file:

path:        ../raw/Vehicle1_velodyne_pos.bag
version:     2.0
duration:    36:10s (2170s)
start:       Aug 12 2015 09:22:18.17 (1439364138.17)
end:         Aug 12 2015 09:58:28.86 (1439366308.86)
size:        23.0 MB
messages:    152840
compression: none [29/29 chunks]
types:       tf/tfMessage [94810edda583a504dfda3829e70d7eec]
topics:      tf   152840 msgs @ 99.2 Hz : tf/tfMessage

As you can see, the topic __tf__ have 152840 messages and after that there is the number 99.2 Hz.

I computed:

 (end_time - start_time) / number of messages

and i got ca. 70 Hz.

What is the meaning of the number 99.2 Hz?

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2018-11-13 14:13:16 -0500 edited question The meaning of the frequency value in rosbags

The meaning of the frequency value in rosbags Dear all, i downloaded a rosbag from the internet and looked at the info

2018-11-13 14:12:29 -0500 edited question The meaning of the frequency value in rosbags

The meaning of the frequency value in rosbags Dear all, i downloaded a rosbag from the internet and looked at the info

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2018-11-13 14:11:29 -0500 asked a question The meaning of the frequency value in rosbags

The meaning of the frequency value in rosbags Dear all, i downloaded a rosbag from the internet and looked at the info

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2018-11-13 14:03:46 -0500 marked best answer Logging and processing the same sensor data

Hi all,

In my system I have a sensor that sends data via TCP/IP. This data should be logged for future processing and also used for a live computation at the same time.

Since i am a newbie to ROS, I have a question concerning a good design for the situation above. Does it make sense to write a node(let) which simply opens the socket, reads the data and publishes the bytes as they come from the sensor. Then use two node(let)s to subscribe to the topic? Or better, one node reads the data, processes it and writes the data to a rosbag?

What happens to this design if there are 20 sensors?

Regards

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2018-11-10 12:42:26 -0500 commented answer Logging and processing the same sensor data

@gvdhoorn, your suggestion (velodyne_drive) is what i was searching for. For Camera data i would probably use sensor_msg

2018-11-10 12:27:50 -0500 commented answer Logging and processing the same sensor data

@Thomas D, I have ca. 20 sensors and not all of them are GPS ;) (Camera, Radar, Lidar and GPS),

2018-11-10 03:27:23 -0500 commented answer Logging and processing the same sensor data

@PeteBlackerThe3rd, i agree with you. The idea is always to have the sensor data in an abstract layer.

2018-11-10 03:22:55 -0500 commented answer Logging and processing the same sensor data

@PeteBlackerThe3rd, i agree with you.

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2018-11-10 02:40:20 -0500 commented answer Logging and processing the same sensor data

Normally moving from one format to another causes for reduce of information, that is why I would always like to log in a

2018-11-10 02:37:31 -0500 commented answer Logging and processing the same sensor data

@gvdhoorn, thanks for trying to explain newbie how ROS works. Assuming my sensor is a camera, then i saw sensor_msgs/Ima

2018-11-10 00:42:49 -0500 commented answer Logging and processing the same sensor data

Assuming my sensor is GPS, then based on your recommendation, I should decode the data and transfer it to e.g. geometry_

2018-11-10 00:42:02 -0500 commented answer Logging and processing the same sensor data

Assuming my sensor is GPS, then based on your recommendation, I should decode the data and transfer it to e.g. geometry_

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2018-11-09 15:17:44 -0500 edited question Logging and processing the same sensor data

Logging and processing the same data Hi all, In my system I have a sensor that send data via TCP/IP. This data should b

2018-11-09 15:09:45 -0500 asked a question Logging and processing the same sensor data

Logging and processing the same data Hi all, In my system I have a sensor that send data via TCP/IP. This data should b