Turtlebot3.md

@@ -258,11 +258,21 @@ In last, we configure the robot deployment using group syntax:
 
 <img src="./images/gazebo-fayol-tb.png" width="600" height="350">
 
-## visualize data of each robot in rviz
+## Control robot
 
++ Control one specific burger, e.g. burger tb3_0, with keyboard using his namespace
+```
+>ROS_NAMESPACE=/tb3_0 roslaunch turtlebot3_teleop turtlebot3_teleop_key.launch
+```
++visualize data of burger tb3_0 in rviz
+```
+>rosrun rviz rviz
+>> Change fixed frame with the reference of tb3_0 burger `tb3_0/odom`
+>> Add robot model, change robot description with `tb3_0/robot_description` and add tf_prefix with tb3_0
+>> Add laser scan and set topic with `tb3_0/scan`
+```
 
 <img src="./images/gazebo-rviz1.png" width="400" height="350">
-<img src="./images/gazebo-rviz2.png" width="400" height="350">
 
 # Use our turtlebot3 robots