# Revision history [back]

### Problem running follower demo turtlebot

I've just received a turtlebot and I'm having some trouble when I try to run the follower demo in the netbook that came along with the robot. The robot doesn't move when I run the command: $roslaunch turtlebot_follower follower.launch The output is: [ INFO] [1405090576.551327448]: Number devices connected: 1 [ INFO] [1405090576.551600322]: 1. device on bus 003:24 is a SensorV2 (2ae) from PrimeSense (45e) with serial id '0000000000000000' [ INFO] [1405090576.553242502]: Searching for device with index = 1 [ INFO] [1405090576.603033557]: Opened 'SensorV2' on bus 3:24 with serial number '0000000000000000' [ INFO] [1405090577.265245722]: rgb_frame_id = '/camera_rgb_optical_frame' [ INFO] [1405090577.265818846]: depth_frame_id = '/camera_depth_optical_frame' [ WARN] [1405090577.280437487]: Camera calibration file /home/turtlebot/.ros/camera_info/rgb_0000000000000000.yaml not found. [ WARN] [1405090577.280986866]: Using default parameters for RGB camera calibration. [ WARN] [1405090577.281605477]: Camera calibration file /home/turtlebot/.ros/camera_info/depth_0000000000000000.yaml not found. [ WARN] [1405090577.281993724]: Using default parameters for IR camera calibration.  I think it should have shown 2 devices connected (kinect and kobuki base). I tried disconnecting each one of them and running the code again and I discovered that the problem is that it is only considering the kinect as a connected device. Do I need to do anything else than connecting the provided usb cable between the base and the netbook? Using the command$lsusb it looks like the usb port is working properly.

### Problem running follower demo turtlebot

I've just received a turtlebot and I'm having some trouble when I try to run the follower demo in the netbook that came along with the robot. The robot doesn't move when I run the command: $roslaunch turtlebot_follower follower.launch The output is: [ INFO] [1405090576.551327448]: Number devices connected: 1 [ INFO] [1405090576.551600322]: 1. device on bus 003:24 is a SensorV2 (2ae) from PrimeSense (45e) with serial id '0000000000000000' [ INFO] [1405090576.553242502]: Searching for device with index = 1 [ INFO] [1405090576.603033557]: Opened 'SensorV2' on bus 3:24 with serial number '0000000000000000' [ INFO] [1405090577.265245722]: rgb_frame_id = '/camera_rgb_optical_frame' [ INFO] [1405090577.265818846]: depth_frame_id = '/camera_depth_optical_frame' [ WARN] [1405090577.280437487]: Camera calibration file /home/turtlebot/.ros/camera_info/rgb_0000000000000000.yaml not found. [ WARN] [1405090577.280986866]: Using default parameters for RGB camera calibration. [ WARN] [1405090577.281605477]: Camera calibration file /home/turtlebot/.ros/camera_info/depth_0000000000000000.yaml not found. [ WARN] [1405090577.281993724]: Using default parameters for IR camera calibration.  I think it should have shown 2 devices connected (kinect and kobuki base). I tried disconnecting each one of them and running the code again and I discovered that the problem is that it is only considering the kinect as a connected device. Do I need to do anything else than connecting the provided usb cable between the base and the netbook? Using the command$lsusb it looks like the usb port is working properly.

EDIT: Thanks for the answer Devon, I've tried what you suggested but unfortunately it didn't work. I didn't find the topic cmd_vel, so I used the other command you suggest and the output was:

\$ rostopic list | grep cmd_vel
/cmd_vel_mux/active,
/cmd_vel_mux/input/navi,
/cmd_vel_mux/input/safety_controller
/cmd_vel_mux/input/teleop
/cmd_vel_mux/parameter_descriptions
/follower_velocity_smoother/raw_cmd_vel


I assumed the topic I would like to verify is the last one. So I ran the follower application again while monitoring the topic, and I could check that it's not sending any velocity commands (assuming the topic I chose is the right one). The output was a bunch of:

linear:
x: 0.0
y: 0.0
z: 0.0
angular:
x: 0.0
y: 0.0
z: 0.0
---


Cheers, gerhenz