Poofjunior's profile - activity

Hello, everyone,

I'm having some difficulty compiling a package that I've created with custom message.

When I run cmake . at the head of that package's directory, I get the error

 Assertion failed: file
  '/home/poofjunior/Projects/ICEX/src/external_sensor_interface/msg/data_logger_measurement.h'
 does not exist.  Message: message file not found

inside of the msg directory in my package, I have a file titled data_logger_measurement.msg but indeed, the file in question, which is the .h file, does not exist in that msg directory.

Isn't this message auto-generated?

Oddly enough, I have been able to run this package before, and I'm slightly convinced that it may be an issue with how my workspace is setup.

Many thanks in advance!

Hello, everyone,

I'm working to define a custom message in ROS Groovy. I've followed the tutorial and updated my CMakeLists to innclude a custom message with the following changes in my package:

  7 find_package(catkin REQUIRED COMPONENTS roscpp rospy std_msgs message_generation)

 19  add_message_files(
 20    FILES
 21    data_logger_measurement.msg
 22  )

 32  generate_messages(
 33    DEPENDENCIES
 34    std_msgs
 35  )

 44 catkin_package(
 45   INCLUDE_DIRS include
 46 #  LIBRARIES tempSensorInterface 
 47   CATKIN_DEPENDS roscpp rospy std_msgs message_generation 
 48   DEPENDS system_lib message_runtime 
 49 )

I've also created a msg directory and placed the following data_logger_measurement.msg file in that directory:

Header header
float32 pressure # [C]
float32 temperature # [kPa]

(This msg is in the same package as my executable that I'm creating.)

unfortunately, when my executable includes this message with:

#include<temp_sensor_interface/data_logger_measurement.h>

and when I call "make" in my build folder, I get a message that there's

No such file or directory

Am I missing another step that creates such a header file in groovy? Thanks for lending a hand on this problem!

Hello, all,

I recently wrote a simple subscriber that subscribes to the topic /odom coming from the irobot_create_2_1 driver for an iCreate. However, when I simply print the odometry data and rotate the wheels myself, the data doesn't change. At the same time, though, if I re-run the Python Script, the data will have changed to the amount I previously rotated it.

Have I made a simple mistake? Or does /odom not publish the current transformation and rotation information.

(I noticed also that the time stamp doesn't change)

Thanks so much in advance for any advice!

Here's my source code:

#!/usr/bin/env python
import roslib; roslib.load_manifest('Phoebe')
import rospy
import irobot_create_2_1

from nav_msgs.msg import Odometry
from geometry_msgs.msg import *
from tf.msg import *



counter = 0

def Position(odom_data):

    global counter
    rospy.sleep(1)
    curr_time = odom_data.header.stamp
    pose = odom_data.pose.pose #  the x,y,z pose and quaternion orientation
    counter= counter+1
    print counter, curr_time
    print
    print pose


def transformation(tf_data):
    global counter
    rospy.sleep(1)
    transform = tf_data.transform
    print transform


def begin():
    while not rospy.is_shutdown():
        rospy.init_node('oodometry', anonymous=True) #make node 
        rospy.Subscriber('odom',Odometry,Position)


if __name__ == "__main__":
    begin()
    rospy.spin() # not really necessary because we have while not rospy.is_shutdown()

Hi, everyone,

Recently, I tried to run through the pcl_ros tutorial to convert a point cloud from a Kinect to an image. My hope is to be able to do the exact same thing in Python, not C++, and then work with the image using the OpenCV Python interface.

here's the tutorial link: http://www.ros.org/wiki/pcl_ros/Tutor...

I hit a small snag, though. It seems like the tutorial is referencing a Ros Topic from openni_camera called /camera/depth/points2, but I can't seem to find this topic in list of topics published by openni_camera.

Rather, I found: /camera/depth/points, but this doesn't seem to generate an image when I make this change in the tutorial.

Will getting the image from /camera/depth/points2 be necessary to fulfill my overall goal?

Also, are there any other ways to easily convert a Point Cloud from the Kinect to an image in Python? Many Thanks in advance for everyone's words of wisdom!

Hello, all,

Recently, we've been attempting to access the kinect depth data from the published point cloud provided by the openni_node, but we've run into a couple stumbling points:

first, the ros tutorial for pcl_ros

http://www.ros.org/wiki/pcl_ros/Tutor...

references a topic published by openni called: /camera/depth/points2 but our version of openni_kinect only publishes: /camera/depth/points Are we using an outdated version?

Also, we tried working with /camera/depth/points and we believe that this information is published in binary format. When we attempted to convert the binary format of a single point to x,y,z information though, we received a list of 4 integers. Are we interpreting the information incorrectly?

We also subscribed to the /camera/depth/image, and we could access the depth information from a single point, but we're restricted to meter-by-meter resolution. Is there a better way of getting more resolution with the /camera/depth/image ?

Thanks for reading, and we appreciate any directions you can point us to accessing the depth information (of points) from the kinect.

Sincerely,

Poofjunior

Oops! I forgot to source my setup.sh script in the devel folder. Afterwards, my ROS_PACKAGE_PATH points to the right directory and the ROSBAG that I wanted to play will now display the data from data_logger_measurement. Thanks everyone!

Ah, this has got to be the problem. roscd won't tab-complete to that package. Under the old flavor, I could just change my package path to fix this. How do I resolve this in the Groovy?

Hello, everyone,

I've followed the steps closely defined here to create a custom message, editting my CMakeLists.txt, my package.xml, and my msg/data_logger_measurement.msg to create a new message.

I've been able to display the data with "rostopic echo /data_logger_measurement" in the past; however, now that I've rosbagged the data to revisit it a few weeks later, I cannot "rostopic echo /data_logger_measurement" when I'm playing a rosbag.

Instead, I get the error:

ERROR: Cannot load message class for [external_sensor_interface/data_logger_measurement]. Are your messages built?

The only changes that I can remember making are updating ROS when I performed a software update on Ubuntu.

Does anyone have any possible leads? (I may have made a few other changes in the past few weeks to ROS, but I cannot currently remember them.)

Thanks very much in advance!