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2020-07-20 07:57:45 -0500 commented question ROS vs VSome/ip

Thanks for your answer, by my Question I am mainly questioning the Design concepts behind both, I am not experienced wit

2020-07-20 05:27:07 -0500 asked a question ROS vs VSome/ip

ROS vs VSome/ip I was wandering why to use ROS in my system rather than other service oriented protocols like GENIVI vso

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2016-04-22 08:09:03 -0500 asked a question interface gazebo camera with c++ program

how can i interface camera in gazebo which publish image topic , to non ros c++ program which take its input from usb web cam ?

can i make a node to convert the ros topic to fake usb cam or what please help

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2016-04-20 15:51:50 -0500 asked a question error python serial ros arduino

i am trying to make a node to send the ROS time to the arduino all the time through serial and am getting this error

syntax error near unexpected token `('
/home/gemad/catkin_ws/src/hello_world/scripts/ros_time_arduino.py: line 5: `ser = serial.Serial('/dev/ttyACM1',115200)'

the code of the node is :

import rospy 
import serial


ser = serial.Serial('/dev/ttyACM1',115200)
rospy.init_node('ros_time_arduino')

while not rospy.is_shutdown():
   ros_time = rospy.get_rostime()
   ser.write(ros_time)   
   mont=ser.readline()
   print(mont)

any ide about what is wrong ?

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2016-03-27 02:40:48 -0500 commented answer catkin_make error after creating custom message

i will check again

2016-03-26 17:37:07 -0500 asked a question catkin_make error after creating custom message

after creating a custom messages files .msg under /mypackage/msg/ when i run the catkin_make i git this error

 Messages depends on unknown pkg: geometry_msgs (Missing
 find_package(geometry_msgs?))

even after uncommented this in the Cmake file

## Generate added messages and services with any dependencies listed here
generate_messages(
DEPENDENCIES geometry_msgs std_msgs
 )

note when i run the command rospack find geometry_msgs i got this /opt/ros/indigo/share/geometry_msgs

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2016-03-21 18:35:14 -0500 commented answer convert image to occupancy grid ?

thanks it now works , i spent many days searching because of this space :D

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2016-03-21 12:21:35 -0500 commented answer convert image to occupancy grid ?

done please help

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2016-03-20 10:58:16 -0500 commented answer convert image to occupancy grid ?

i did so, but the map_server halt at the waiting for the map state

2016-03-19 09:49:47 -0500 asked a question convert image to occupancy grid ?

how to convert image taken from camera to occupancy grid map ? what i did till now is to :

1- i made this photo by paint just a white area with black boarders to let the robot moves within it

http://imgur.com/7ize04b

2- create a .ymal file with the same name at the same dir with this content

image:map.png
resolution: 0.1
origin: [0.0, 0.0, 0.0]
occupied_thresh: 0.65
free_thresh: 0.196
negate: 0

3- run the roscore

4- rosrun map_server map_server map.yaml

and nothing happens , i checked the published topics using rostopic list and nothing is published, please help

2016-03-19 07:18:47 -0500 asked a question can i convert image by a camera into map ?

is it possible to convert image taken by regular usb cam into map and publish it using map_server ? am using external camera based localization so i dont have lidar or ultrasonic to draw the map note: my mape should be sample empty area captured by the camera and add black boarders to it to prevent the robot from getting out the scene

2016-03-03 12:35:29 -0500 asked a question whycon cqamera localization help !

i am new to ros and am trying to localize swarm robots using normal webcam so i found whycon i am following the tutorial https://github.com/lrse/whycon/wiki/T... but nothing happen and i dont know how to debug that iam sure that 1)my camera publish images on the topic /usb_cam/raw_image 2)the image processing node publishing image on topic /usb_cam/image_mono ....etc

the whycon publishing the pose but when i am trying to echo the /robot_pose or the /image_out i have nothing on the screen no error message no output what should i do ?