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Their are no generic packages for such devices. It entirely depends on the type of interface provided with the sensor (e

I'm sure you will have to contact the manufacturer or vendor for driver support on this, their are no generic packages f

I'm sure you will have to contact the manufacturer or vendor for driver support on this, their are no generic packages f

I'm not sure if this issue is entirely ROS relevant, posting it on Vesc forum would be alot more helpful. For the odom p

Just the global plan

It depends on your requirements IMHO, if you have some realtime requirements then adding RT-Linux patch would help along

I havent had experience with ROS2, but for ROS1 creating recipes was pretty much the best way i could find. You could cr

I havent had experience with ROS2, but for ROS1 creating recipes was pretty much the best way i could find. You could cr

It would help others if you could provide more info regarding your issue such as the ROS and OS distro, your launch file

The planning part is performed before moving always. Why don't you use gazebo to do the same, move_base does offer a ser

The error is self-explanatory actually. dynamic_reconfigure::Server has a method to update the parameter configuration u

Please have a look at the rosserial package and the supporting tutorials.

I got it working, but this is more of an adhoc solution. Following is the constructor for AX2550 class, the parameter to be passed is the serial port to which the controller is connected.

AX2550::AX2550 (string port): port_(""), serial_port_(NULL), serial_listener_(1), connected_(false), synced_(false){  this->port_ = port;

I believe somehow the parameter wasnt being set and the default parameter shown below was being used,

std::string port;
n.param("serial_port", port, std::string("/dev/motor_controller"));

So i changed it to the following

std::string port;
n.param("serial_port", port, std::string("/dev/ttyUSB0"));

Now it works. But i will have to change the code and re-make the node everytime i change the port. The source code can be found here https://github.com/wjwwood/ax2550.git .

If anybody could tell me what is going wrong with the node, i'd be deeply grateful. Thank you.

Did you find the solution for this?.. Even iam struggling with the same issue

Hello,

I have been trying to run the ax2550_node from the ros ax2550 package found here https://github.com/wjwwood/ax2550.git .

But i get an error which says

AX2550 connecting to port /dev/motor_controller
[ERROR] [1424892454.858165528]: Failed to connect to the AX2550: IO Exception (2): No such file or directory, file /tmp/buildd/ros-hydro-serial-1.1.7-0raring-20141231-2116/src/impl/unix.cc, line 150.
[ INFO] [1424892454.858316111]: Will try to reconnect to the AX2550 in 5 seconds

I have tried changing the port permissions as suggested by this user ( http://answers.ros.org/question/18655... ) but to no avail. Could anyone please help me resolve this issue.

Update:

I have switched the usb-serial converter. I am now using Aten uc232-a. I am able to communicate with the controller via the roboteq roborun pc utility for windows 8. But somehow this node is unable to connect. I have tried assigning the serial port string("/dev/ttyUSB0") to the serial port parameter of the node using the following line : [rosrun ax2550 ax2550_node _serial_port:="/dev/ttyUSB0"] (&) [rosrun ax2550 ax2550_node serial_port:="/dev/ttyUSB0"] but it too has failed.

I dont know what iam doing wrong. Could anyone please guide me into the right direction. It is absolutely important for me to get this node working.

This is the output from "ls -l /dev/ttyUSB0":

crwxrwxrwx 1 root dialout 188, 0 Feb 28 04:14 /dev/ttyUSB0

And when i run the node with the following command " rosrun ax2550 ax2550_node serial_port:="/dev/ttyUSB0" " i get the same error as specified earlier.

Could anyone please tell me how to get rosserial working on tiva connected launchpad. I want to publish Imu msgs over rosserial from my launchpad. I have tried sending data over uart from launchpad to arduino but it is a very adhoc solution and doesnt work entirely. Frankly i would love to get the rosserial working on my launchpad. please do help if you can

if your IMU is outputting roll,pitch and yaw then your covariance matrix would be a 3x3 matrix. The diagonal elements represent variance of each measurement (eg: if variance of pitch is Ypp, roll is Xrr and yaw is Zyy). Cov[0][0] = Xrr; Cov[1][1] = Ypp; Cov[2][2] = Zyy;

You can also fill out the non-diagonal elements which represent co-variance (how two variables change ). But the diagonal elements themselves should be enough for robot_pose_ekf.

This video will help you get a good overview of ROS. Best of luck :). https://www.youtube.com/watch?v=IfefT...

@Kristof: According to REP-103 & 105. The body frame is to be oriented (+X- north, +Y-west, +z-up). My imu uses (+Y-north, +X-east, +Z-up). should i be converting these orientations in the imu processing itself or i could somehow convert these notations under ROS?.

Hello everyone,

This is a 2 part question:

1) I am building a differential drive robot. Which uses encoders and imu to get the orientation of the robot. The imu is an MPU9150 with TM4c1294xl microcontroller. I have successfully fused the gyro and magnetometer via a kalman filter to get an estimate of yaw (referenced with the initial conditions). I want to be able to publish yaw output from my imu via the rosserial package. I will be publishing the yaw output only, so my euler orientation should be (0,0,yaw) right? And which orientation convention does ros use. I am using North-East-Down(NED). I am using udoo board which is running rosserial on its arduino compatible microcontroller. The udoo is connected via i2c to my TM4c1294xl. My question is , does ros provide standard msg type to support euler angles from an imu ? could anyone please point me into the right direction.

2) Would i be better off by tilt compensating my magnetometer rather than just assume that the robot drives on plane surface through out. What are the pros and cons of not implementing it.

No not really.. hopefully wont be a problem. Just wanted your say on this.

Requesting partial scan data stream.. why am i getting this??..

Requesting partial scan data stream..

Why does it say partial scan?..

yup got it working. I ripped open the usb-serial converter that i had been using and turns out the chip inside was of some chinese make and wasnt compatible with the ftdi_sio module. After a while i remembered that i had an old serial to ttl logic converter which also happens to be a serial-usb converter. It uses a silabs chip compatible with cp210x. Although i was quite skeptical since it uses a max232 IC to convert the serial signal to ttl levels. But anyhow i connected it and it worked right away.

On a side note though, will the max 232 IC cause me to miss some scans??