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Rosserial missing subscribed messages

I'm making a humanoid robot kid size and ros noetic to control several dynamixel MX28-AT. I have a code to receive angles calculated in the high level using rosserial to connect with teensy4.0 at ...
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1 answer
33 views

Dynamixel Motor - Clarifying on the use of Position Read

Clarification: I would like to clarify whether it is ok to use "position read" on the motor position while in velocity mode. Context: So I am using the XC330-T288-T motor and basically ...
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1 answer
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Compatibility of MG996R Servo with ROS and Dynamixel Communication

I am currently working on a robotics project following the instructions in the "ROS Robotics Project" book by Lentin Joseph. The book originally suggests using the Dynamixel AX-12A servo ...
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67 views

How to make the connection of dynamixel become modular by using ros2 control hardware interface

I'm trying to make the robot that using dynamixels to control the movement of the joint. One of the application is that when one leg of the robot is disconnected, when I connect it again the software ...
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14 views

error : actuatorTorque // setInitPose

Our team is following this manual, and we have run into an error when attempting to call the /set_actuator_state and ...
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70 views

Dynamixel MX-106T (2.0) Profile Velocity and Profile Acceleration using U2D2 and Wizard 2.0

I am trying to control the MX-106 servo by setting the Profile Velocity and Profile Acceleration under Current-based Position Control Mode using the Wizard software. However, I am not getting the ...
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35 views

Dynamixel XM430-W210-R configuring getPresentPosition or suggest an alternative?

I am currently using 2 Dynamixel XM430-W210-R servo motors and have encountered a strange issue with getPresentPosition function. Now, this might just be a configuration issue that I have been unable ...
1 vote
0 answers
55 views

Arduino & Dynamixel XM430-W210-R: Adding a potentiometer to increase/decrease rotation

I want to create an improvement to an Arduino script. I have a Dynamixel XM430-W210-R servo with a Dynamixel Shield and Arduino Mega. I am using the OP_EXTENDED_POSITION mode. Here is part of my code ...
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1 answer
60 views

Dynamixel Workbench Installation Error

I run make in accordance with the Section 3.3.3.Setup DYNAMIXEL Workbench library. But, I got the following error. ...
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1 answer
34 views

[SOLVED] How do I control 2 dynamixel motors simultaneously using a service?

I could only send for one motor at a time... ...
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0 answers
174 views

How to control the Dynamixel Motor in PWM mode without having it locked when PWM is zero

I want the motor to be free to move by hand when I set the PWM to zero. Instead, there is a torque that makes the motor still in one position. Is that possible to do?
1 vote
0 answers
167 views

Smart Servo Motor Type Comparison

I have been using the standard MG90/SG90 servo motors for years now and am familiar with them. Recently, I am trying to build a robot dog with them with no success. The motors keep on vibrating and ...
0 votes
1 answer
40 views

Having trouble publishing JointState msg from Arduino

Hi everyone, I am currently creating my own robotic arm actuated with Dynamixel motors. The point of my code is to read the motor's position with an Arduino Mega and fulfill a sensor_msgs/JointState ...
0 votes
1 answer
420 views

Dynamixels (AX-12A) no longer detected after id change

I have 8 dynamixels that are connected together. Everything worked fine until I changed all their ids to 200,201,202, ... To change their ids, I used this python library. Now, none of my motors are ...
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1 answer
6 views

Strange data in arduino and ROS serial communication

I'm using AX-12+ dynamixel motor as an encoder in my robot joint. I receive data with dynamixel packages in ros kinetic. Then by the aim of a python node, I subscribe to the data and publish it to the ...
2 votes
0 answers
69 views

Can't set ID to Dynamixel MX-64

I have 2 WidowX robots which I already successfully address ID's for all the MX-28 and AX-12A servos using ROS code in the Arbotix controller with the Dynamanager 1.3 on a Mac but I can't detect any ...
0 votes
1 answer
19 views

Is it possible to control Dynamixel X series motors using Raspberry Pi?

I am looking to use Dynamixel X series motors (XM-430) for a torque control application. Since they are supported by ROS, I wanted to know if I can use RPi to control them, or do I need to invest in a ...
0 votes
1 answer
13 views

Dynamixel X with OpenCM 9.04C and ROS possible or OpenCR/U2D2 need?

Dear all, I plan to build a robot arm with Dynamixel X servos. I also want to use ROS tools and drivers for the servos. I found there is a cheap OpenCM 9.04C Controller board (~20USD) available, also ...
0 votes
1 answer
7 views

Advantages of Dynamixel X -T / -R TTL vs RS-485

I'm planning to buy servos for a humanoid robot that I control with ROS, is there any disadvantage of the TTL vs RS-485 versions? EMC/Electric disturbance / how many servos on one line/bus are ...
0 votes
1 answer
161 views

Dynamixel MX-64T ID Problem

I have WidowX Robot Arm Mark II and I'm trying to give IDs to my servo motors. I could give IDs to two MX-28T motors and two AX-12A motors. However, there is no way I could assign IDs to two MX-64T ...
1 vote
0 answers
148 views

What frames are supported by the Dynamixel XL-320 OLLO?

I was recently looking into purchasing either a Dynamixel AX-12A or XL-320. The XL seems to use OLLO frames, which only seem to be available in a toy-like set. I was wondering if there are any other ...
0 votes
1 answer
7 views

Sudden velocity changes and their impact on a Turtlebot

I am using a Turtlebot3. Their provided "teleop" code example the code makes sure that the velocity requested via cmd_vel messages don't change too quickly too radically. However many of ...
0 votes
1 answer
43 views

Do Dynamixel Servos give position feedback in velocity control mode?

Some of these servos have as high as 4096 positions/revolution accuracy (0.088°). So I think if I command it to go to a particular position, say 100°, the actual position will be between 100.088° and ...
0 votes
1 answer
8 views

How would you replace the Dynamixels on Turtlebot3 with DC motors?

Is it possible to replace the Dynamixels on Turtlebot3 with an Arduino, driver, and DC motors with encoders? If so, how? Has anyone gone through this process and knows which steps need to be taken or ...
0 votes
1 answer
1 view

dynamixel_workbench: message fields for single_manger to multi_port

I am running ROS kinetic on Ubuntu 16.04.3 LTS (and kernal name 4.13.0-32-generic). I am working with the dynamixel_workbench stack. Specifically, I have a MX-106, an MX-64, and another MX-64 daisy-...
0 votes
1 answer
2 views

Creating a dynamixel action client controller (Tutorials)

Hello, I am following the tutorial for dynamixel_contollers as posted on http://wiki.ros.org/dynamixel_controllers/Tutorials/Creatingdynamixelactionclient When I run "trajectory_client.py", ...
0 votes
1 answer
3 views

I want to control 10 dynamixel motors using ROS Python. I am succeeding up to 6 motors at a time but not all

I want to control 10 Dynamixel motors using ROS PYTHON, I am succeeded to control 6 motors at a time. But while not all 10. What should i do to move them using my slider control program, As i started ...
0 votes
1 answer
2 views

Dynamixel Controller for MX28AT

Hello, I am new to ROS, I want to control Dynamixel motor MX28AT with ROS. Which controller should i use? and how to use it? Thank you Originally posted by calvintanct on ROS Answers with karma: 21 ...
0 votes
1 answer
10 views

Is it possible to change PID parameters of 6 motors silmutaneously(in a single launch file)?)

Hi everyone, i'm trying to control a 6 dof robot arms using 6 dynamixel motors(MX series). The only way i know to tune PID parameters is to launch dynamixel_workbench_single_manager. However, i may ...
0 votes
1 answer
3 views

dynamixel_controller manager wrong package prefix

Hello, I'm working with the dynamixel MX-64AT servos. Using a Ubuntu 16.04 and ROS kinetic version 1.12.12 Up until now I had no problem to get them up and running. Then I switched computers and now I ...
0 votes
1 answer
857 views

Inverse Kinematics 5DOF - general approach - Wrong solution MATLAB

Can anyone name a good source for a general approach (cookbook-like) for the inverse kinematics regarding a 5-DOF? The paper by De Xu et al. is aiming for a general approach, but it doesn't work for ...
0 votes
1 answer
26 views

How to set the dynamixel motors to multi-turn mode

I'm trying to use dynamixel MX-106 in ROS, and I want to use it in multi-turn mode. I could find the way to set it to multi-turn mode in operating manual which can be found in web page of Robotis. But ...
0 votes
1 answer
1 view

using arduino inestead arbotix for controll motors

i want using arduino for control dc motor . What steps are needed ?? what change i need to use codes in ROS by Example Vol2 book . i want using arduino inestead arbotix controller to send ...
0 votes
1 answer
5 views

How to make ros communication with dynamixel servo?

Hi, I converted 3d point cloud data using 2d laser scanner with a servo motor .But now ı want to use dynamixel AX 12A servo motor. How to use this motor with Ros? So how to make ros communication with ...
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1 answer
1 view

Difficulties in visual tracking in Ros-by-example book

Hi Rossers I am stack over the flow, I need help plz, I don't know where I am mistaken. I have Phantomx pincher robotic arm (with 5 dynamixel 12ax servos) connected with arbotix-m board, I am using ...
4 votes
2 answers
1k views

Nuc, custom pc or raspberry pi?

For our Minor “Robotics and Vision” we need to use ROS to create a system that can navigate to and from a coffee machine. The available hardware consists of a robotic platform from "Dr Robot", and a ...
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1 answer
2 views

Dynamixel Controller Manager showing "waiting for dependencies"

I am following this tutorial: http://wiki.ros.org/dynamixel_controllers/Tutorials/Creatingmetacontroller When I run the command roslaunch my_dynamixel_tutorial start_meta_controller.launch ...
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1 answer
116 views

How to solve the error "cannot marshal None unless allow_none is enabled ”

Hi, I am new to ros. we are trying to interface the dynamixel Pro-42 series actuator to our hardware. we are following steps mentioned in tutorial "http://wiki.ros.org/dynamixel_controllers/...
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2 answers
4 views

Which dynamixel package shoud be used?

Does anyone have experience with both "dynamixel_motor" and ("dynamixel_sdk" or "dynamixel_workbench") If I am understanding correctly, it seems that "...
0 votes
1 answer
5 views

dynamixel ax12 tutorial

I have acquired a Dynamixel AX12 + Dynamixel2USB, and I'm trying to follow up the next tutorial: http://wiki.ros.org/dynamixel_controllers/Tutorials/ConnectingToDynamixelBus Once I reach point 2, I'm ...
0 votes
1 answer
13 views

Split joint trajectory controller

I have an arm that uses dynamixel servo motors. I use the dynamixel motor stack along with Moveit! to operate it. The dynamixel stack is structured very similarly to ros_control, however, it is not ...
3 votes
1 answer
1k views

Simulating Dynamixel motors in Gazebo

I'm trying to simulate a humanoid robot using Gazebo with plugins. Since our actual model uses Dynamixel motors, I'd like to know how exactly they work to make the simulation as realistic as possible. ...
0 votes
1 answer
118 views

how to restart dynamixel after overload error?

Hi. I'm using dynamixel_motor package to control my robot. Often my dynamixel shows over load error because of tough usage. Once this error happans, I have to switch off my dynamixel and switch on ...
0 votes
1 answer
4 views

ros_control actuators and transmissions

I am controlling a dynamixel based SCARA arm (4 revolute joints) using ROS (MoveIt + ros_control + dynamixel_controllers). Before controlling the actual arm, I attempted to test the system with Gazebo....
0 votes
1 answer
2 views

Connecting to Dynamixel Bus Tutorial

I am following Dynamixel tutorials on ROS Wiki. http://wiki.ros.org/dynamixel_controllers/Tutorials/ConnectingToDynamixelBus In Step 2 : Create a launch file for the manager node, The code of the ...
0 votes
1 answer
6 views

Hi everyone, i am working with dynamixel AX-12A, upto which maximum angle i can move it?

I am following the this dynamixel tutorial. Is it possible to make it move 360 degree or upto which maximum angle it can be moved? Also how can i change the speed of dynamixel AX-12A? Originally ...
0 votes
1 answer
28 views

How to solve pthread_create() failure: EPERM

I am attempting to use the ROBOTIS-Manipulator Code in ROS Indigo on Ubuntu 14.04. It is successfully executing catkin_make but is giving an error in roslaunch. After a lot of time I think that I have ...
0 votes
1 answer
4 views

roslaunch dynamixel

Hi again, here i'm still got problem changing my friend's ros-files electric structure and i want to changed it to indigo. i've download and install the dynamixel driver by ...
0 votes
1 answer
3 views

Which frames i have to provide tf between hokuyo lidar and dynamixel motor ax-12a?

I want to see the laser scans spinning in rviz. `#include <ros/ros.h> #include <tf/transform_broadcaster.h> #include <dynamixel_msgs/JointState.h> #include "sensor_msgs/...
0 votes
1 answer
12 views

How can I move a dynamixel AX-12A motor with a python script?

I want to move two dynamixel ax-12a motors, one as pan and the other as tilt. Writing the comands in the shell works fine e.g. rostopic pub -1 /pan_controller/command std_msgs/Float64 -- 1.5 Now I ...