Robin Robotics

Hi let see how to create ros package package createing command eg : catkin_create_pkg  <pkg_name>  [depend1]  [depend2] ... catkin_create_pkg :- this is a keyword to create pkg pkg_name :- u have to choose ur pkg name depend : it means ur pkg depend in what. for a eg if u like to do ur programming in python u need to add depend as rospy like wise   python --> rospy   c++       --> roscpp msge    --> std_msgs lets create one sample pkg name call robin . First  u need to go catkin Dir. then u need to go src folder .bcz all pkgs located inside. u have to create ur pkg inside the folder copy& paste in ur terminal catkin_create_pkg robin rospy roscpp std_msge output :- Created file robin/CMakeLists.txt Created file robin/package.xml Created folder robin/include/robin Created folder robin/src Successfully created files in /home/robinrobotics/catkin_ws/src/robin. Please adjust the values in package.xml. in this folder if u like to add c++ c

For this tutorial we will inspect a package in ros-tutorials, please install it using        sudo apt-get install ros-<distro>-ros-tutorials rospack allows you to get information about packages       rospack find [package_name] roscd , It allows you to change directory        roscd [locationname[/subdir]]   pwd , print the working directory using the Unix command        pwd  echo , display the output in terminal        echo $ROS_PACKAGE_PATH rosls  It allows you to ls directly in a package by name rather than by absolute path.         rosls [locationname[/subdir]] rospack = ros + pack(age) roscd = ros + cd rosls = ros + ls  

Its a basic thing & main part in ROS . Nodes are executables that can communicate with other processes using topics, services, or the Parameter Server. Node can be create in python , c++ , Lisp Two nodes can communicate each other using topics (interchange meassage/data  ) Every nodes have to named by programmer.that name used to communicate or identified by other node. roscpp is lib to create ros node in c++ & rospy for python language In ROS have some  commands to retrieve the running nodes information rosnode info node : This prints information about the node rosnode kill node : This kills a running node or sends a given signal rosnode list : This lists the active nodes rosnode machine hostname : This lists the nodes running on a particular machine or lists the machines rosnode ping node : This tests the connectivity to the node rosnode cleanup : This purges registration information from unreachable nodes   rqt_graph :  Provides a GUI

 Hi guys let see how to setup arduino with ros(robot operating system) Before this step u need to install arduino & ros in ubuntu Then after u need to copy & paste this code in ur terminal and press ENTER        sudo apt-get install ros-indigo-rosserial-arduino       sudo apt-get install ros-indigo-rosserial  press enter . then u need to find out arduino lib folder in ur HOME & open ther terminal on it then u need to copy & paste this code in that terminal          rosrun rosserial_arduino make_libraries.py  and press enter . then open the arduino IDE and upload a sample code in ur board  Now let see how to do in ros . check whether ur ros arduino lib is install or not. start the ros master using " roscore " connect the arduino with ros           roslaunch rosserial_python arduino_one.launch   in arduino publisher node name is chatter ..  we can check its work or not  using " rostopic list " we can display the chatter node u