hmchung's profile - activity

overview network karma followed questions activity

2021-04-09 11:14:24 -0500	received badge	● Good Answer (source)
2021-01-16 02:27:32 -0500	received badge	● Nice Answer (source)
2020-03-28 06:32:41 -0500	received badge	● Necromancer (source)
2020-03-28 06:32:41 -0500	received badge	● Teacher (source)
2018-04-23 09:09:00 -0500	answered a question	Rviz OGRE Exception(2:InvalidParametersException) I got into the same issue and realized it was actually image encoding issue. In my case, I tried to encode gray scale i
2017-02-01 03:40:48 -0500	commented answer	Turtlebot RVIZ visualisation opposite from real Robot I assume that you are starting the SLAM by a launch file, yeah? Try adding a `static_transform_publisher`. Something like this might work: `<node pkg="tf" type="static_transform_publisher" name="laser_to_baselink" args="0 0 0 3.14159 0 0 /laser /base_link 50"/>`
2017-01-31 22:47:32 -0500	answered a question	Turtlebot RVIZ visualisation opposite from real Robot I am making a guess here. Since your `turtle_bot_teleop` drives the robot while `hector_slam` builds the map independently, the problem could be your TF, the orientation of the laser maybe. Try checking your TF tree, especially the `laser->base_link`
2017-01-31 22:34:47 -0500	answered a question	Arduino /cmd_vel and /odom with Pololu motors w/ encoder Can you post a snippet of your Arduino code here? Besides, I am not exactly sure about `ros_arduino_bridge`, but why not just use Arduino `servo_lib` for PWM? It works for my Arduino Mega driving a Sabertooth 2X25?
2017-01-22 22:01:24 -0500	answered a question	DC motor +Raspberry pi3+ROS The simplest way I can think of: Hardware: RPi3 -> Arduino -> Speed Controller -> Motor Software: - In RPi3: rosserial - In Arduino: rosserial, servo_lib
2017-01-21 03:37:19 -0500	received badge	● Enthusiast
2017-01-20 22:48:48 -0500	commented answer	How to retrieve the quaternion in (x,y,z,w) format from tf Worked for me, on ROS Indigo! Thanks!
2017-01-20 22:48:02 -0500	received badge	● Supporter (source)
2016-12-03 05:04:44 -0500	commented answer	Transforming Point Cloud Hi, I am sorry to bring this up again. I am using Indigo and have same problem with dmngu9: ‘pcl_ros’ has not been declared. Do you have any clue how to fix?