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2015-05-26 07:50:42 -0500 | received badge | ● Good Question (source) |
2014-01-28 17:30:03 -0500 | marked best answer | How to read encoder ticks from arduino with pyserial I am using a arduino due to read two encoders for wheel position. How do I send those number strings to the pyserial and have pyserial read it as left, right wheel(for ros Odom)? I am not all that good at programming, so how would I setup up the sending side and the receiving side? The encoders resolution is 4096 tick/rev and full motor speed is 3k rpm. I am using the output for the differential_drive ros package. http://www.ros.org/wiki/differential_drive |
2014-01-28 17:29:46 -0500 | marked best answer | serial numbers in a launch file. I am new to ros and I am trying to create a launch file to start two motor controllers, roscore, and some other nodes. I have two motor controllers that are identical except for their serial number. When using the terminal I would type (each in its own terminal),
Doing that would make two nodes, one named "r_controller" using the device with the serial number of" 3800-6F06-3055-3932-7560-0343" and the other node being "l_controller" with its serial number. How do I do that same thing in the launch file? What would that translate to? |
2014-01-28 17:29:16 -0500 | marked best answer | chipkit max32 Lost sync with device, restarting... I am trying to run the rosserial tutorial "hello world" on a chipkit max 32. I can compile and upload to program to the max32. when I run "rosrun rosserial_python serial_node.py /dev/ttyUSB1", it returns ROS Serial Python Node Connected on /dev/ttyUSB1 at 57600 baud then after several seconds it returns [ERROR] Lost sync with device, restarting.... when I first start the python node the tx light blinks and every time the node tries to connect. I have read other posts, but non of them seem to answer or fix the issue. The max 32 is almost identical to the arduino due but it runs on a pic controller. I am using the latest mpide 23. I am not sure how to get it to connect and work. |
2014-01-28 17:28:42 -0500 | marked best answer | what hardware should I use for wheel encoders. I am building a differential drive robot from an old powered wheelchair. The wheels are attached to the motor by a ~10:1 gearbox. I would like to add encoders to the motors. what kind of encoders should I use. I am running a full PC onboard. I have a chip kit max32 that I could use as an interface. What is the best way to add encoders. Is there a useful usb interface? What kind resolution should I look at. The motor drivers I am using do not have encoder feedback. Thanks for any feedback. |
2014-01-28 17:28:15 -0500 | marked best answer | Is ROS for me? I am building a hobby robot from a old powered wheelchair. For the brains I have built a mini PC (intel core i3). For the motor controllers I am using two 25amp pololu simple motor controllers that can controlled over USB. I have a USB video camera that I'll use as well as a high power wifi radio. I consider myself to be a beginner at the software side of robotics. I have programmed some with the arduino compiler and visual basic. For right now I would like to be able to control the robot remotely and see what it sees. Just something to play around with until I can program more complex actions. My question is, is ros the best route for me to start from scratch with? |
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2013-07-23 18:20:18 -0500 | marked best answer | where do I need to start I am very new to ros and i am building a robot from an old powered wheelchair containing a full PC, two USB high power motor controllers, USB camera on a RC pan and tilt, high power WiFi radio. my goal for this robot for now is remote control over the WiFi. I have installed ros and have run through most of the beginner tutorials. my question is, where do i start. what are the steps that i need to follow to make it remote controlled. i have no software written for this robot. |
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2013-06-04 18:34:09 -0500 | marked best answer | how to make rosserial work with 32 bit micro controller. please help I have a max32 and I am trying to relay wheel encoder data from the max32 board to ros. The max32 is a arduino compatible device. It is almost identical to the arduino 2500 or the due, except the max32 is a pic32 and 32 bit. I tried rosserial_arduino, but looses connection and tries to reconnect. I'm not sure how to write a new hardware class for the chip kit. Or should I try to modify the arduino class? I am running ros groovy and Ubuntu 12.04 lts. thanks for any help you can give. |
2013-05-04 03:50:21 -0500 | commented answer | I need help making/building a catkin package. Any ideas? |
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2013-04-28 06:29:45 -0500 | commented answer | I need help making/building a catkin package. Both pythons have yaml |
2013-04-27 17:28:26 -0500 | received badge | ● Notable Question (source) |
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2013-04-27 07:25:35 -0500 | commented question | I need help making/building a catkin package. All I am importing is import serial import time import rospy from std_msgs.msg import Int32 |
2013-04-27 07:14:31 -0500 | commented answer | I need help making/building a catkin package. walle@wallebase:~$ sudo apt-get install python-yaml
Reading package lists... Done
Building dependency tree |
2013-04-27 07:13:42 -0500 | commented question | I need help making/building a catkin package. No I don't. just <build_depend>std_msgs</build_depend><build_depend>rospy</build_depend><run_depend>std_msgs</run_depend><run_depend>rospy</run_depend> |
2013-04-26 12:54:12 -0500 | asked a question | I need help making/building a catkin package. Let me start off by saying that I have read the tutorials on how to make a package and how to build it, but I seem to be too stupid to get it right because it never works. I am running ros groovy on Ubuntu 12.04lts. This is what I am trying to do, build a package that can be started by a launch file. The package is a python script that reads a serial line form a arduino and publishes it on a ros topic. The package that I want to make is all based around "encoder_feedback.py". After I build the package, I try to run it with What do I need to do to build a working package? Let me know if I need to post the .py code or include more info. Thanks for any help you can give. |
2013-04-19 09:11:15 -0500 | marked best answer | how do I make a ros publisher run under python 3? I made a python3 script that will read left, right encoder ticks from an arduino. I am trying to now get that same code to publish those ticks. This is what I have so far. sorry I not at all good with python. How do I get it all to work together. As you can tell I have no clue what I am doing. Thanks for any help you can give. |
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2013-04-16 12:04:15 -0500 | commented answer | how do I make a ros publisher run under python 3? rospy.exceptions.ROSSerializationException: field data must be an integer type |
2013-04-16 12:03:59 -0500 | commented answer | how do I make a ros publisher run under python 3? Traceback (most recent call last): File "Desktop/try3.py", line 20, in <module> lpub.publish(Int16(left)) File "/opt/ros/groovy/lib/python2.7/dist-packages/rospy/topics.py", line 801, in publish raise ROSSerializationException(str(e)) |