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Questions tagged [servo]

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Arduino Uno can only produce certain PWM duty cycles

I'm using the servo library on an Arduino Uno R4 to control a servo. However, when I use Servo.microSeconds(), the duty cycle only changes with every 100th ...
Pappa's user avatar
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Robotic Arm Singularity Problem using velocity control

currently I am using Cartesian coordinate to move the end effector to a given point following aruco marker. I would like to know will there be any benefits using twist velocities command instead ? I ...
Ankit Kumar's user avatar
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2 answers
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Best Protocol for Wireless "Instantaneous" Servo Control?

My goal is to have a servo that can be controlled by a mouse "instantaneously", aka as fast as a racing video game cursor or limited by the speed of the servo itself. So far, I have tried ...
Vincent S's user avatar
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1 answer
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Servo Tester Only Works When Power and PWM are On Same Battery, Why?

I am having a problem when switching my servo power supply from the microcontroller to a separate battery pack. Fortunately, I was able to replicate the problem with two different cheapo servo testers,...
Servo Troubleshooter's user avatar
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1 answer
52 views

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 ...
Lucas Ólives's user avatar
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1 answer
103 views

What motors can I use that are compatible with ROS2?

I'm looking for some servo motors that I can use on a ROS2-based robot and am unsure what my options are. Ideally the motors would have integrated controllers that ...
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1 answer
39 views

arduino robot arm with moveit

Hello, I recently bought a 6 dof robot arm (7 servos), the servos have no feedback I have built a somewhat accurate urdf (difficult since i measured it) and i plan to control the arm with rosserial ...
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1 answer
28 views

It's is possible to use SOEM to communicate directly to a AC Servo Drive using ROS?

I need to develop a cartesian robot of 5 DOF without using a PLC. The AC servo drive that I have can communicate via CANopen or EtherCAT (and other protocols too). Choosing to use EtherCAT now I can, ...
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1 answer
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rosserial Publish and Subscribe to Ultrasonic Ping Range Data?

Hi, I am very new to ROS and I have a few questions as I am trying to learn it all on my own. I've read the tutorials but there are still some things I need some clarification on. I want to publish ...
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1 answer
41 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 ...
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1 answer
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how to run ethercat delta servo with ros

how to configure the ethercat servo drive with ros to control the position of servo Originally posted by Tomn on ROS Answers with karma: 1 on 2017-09-04 Post score: 0
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Some questions on how people are using servos with ROS and Arduino

I'm just getting started with ROS and ultimately want to do some experimentation with CV and physical object manipulation, but I have miles to go before I'm at that point. I have been working with ...
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1 answer
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How to control a hobby servo via arduino using RViz GUI?

I am using ROS Indigo, Ubuntu 14.04LTE and Arduino UNO. I need to control a hobby servo via arduino using RViz GUI. If I move the scroll bar, the motor should rotate. Originally posted by ...
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1 answer
6 views

Raspberry + ROS + Servo

Hi guys, could anyone tell me some tutorial that teaches to control servoss via ROS installed in a Raspberry PI 3 (Ubuntu Mate Originally posted by zpguedes on ROS Answers with karma: 1 on 2016-11-21 ...
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1 answer
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Rosserial_arduino Servo Code

This is based on this tutorial: http://wiki.ros.org/rosserial_arduino/Tutorials/Servo%20Controller For some reason, I can't run catkin_ make so I can not test this out, but it is hevily based on the ...
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1 answer
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Interface EtherCAT servo motor with ROS

hello everyone, i am student and i want to build my own robot arm. I have finished my robot urdf file and MoveIt! setup. Now i have bought Panasonic Servo and motor(MINAS A5B EtherCAT servo drives). ...
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1 answer
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adafruit 16 channel servo driver package

After a bit of a web search, I have come up dry on a ROS package for the Adafruit 16 Channel Servo Driver Board. It wouldn't be difficult to make one, I just want to make sure no one has seen one ...
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1 answer
9 views

How to setup ROS for controlling servos

I'm new to ROS, and I'm trying to create a ROS setup for a simple 4 legged robot, with 2 DOF per leg. Since there's no physical robot, I'll have to simulate everything in Gazebo. However, I'm not ...
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1 answer
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Ros communicate via rs232

I have servos that communiate via rs232 and I was wondering if anybody knew of any ros libraries or packages that can communicate with devices over rs232. I looked at rosserial, and I think it is ...
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0 votes
1 answer
3 views

ROS to control servos in R/C-Car?

Hi, i want to use BeagleBoard Black in an R/C-Car to control the steering and braking servo. Is it useful to use ROS? Or is it "too much"? Which means that this task could be solved by using ...
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0 votes
2 answers
3 views

rosserial RosServoControl arduino with two servos

Hi all!! I am trying to go further with the basic example of Ros Serial with Arduino and a Servo. In this example, the publisher asks for an angle where to drive a servo. I am trying to do this with ...
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1 answer
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How to get Angle data from AX-12 Servo

Hi ROS fans.. I try to make a node that read angle position of AX-12 Servo.. I move manually the motor servo and then the node read the servo's position.. How do I get servo's position ?? I hope ...
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2 answers
3 views

Visual servoing with ROS

I'm trying to develop a visual servoing application using ROS, AR.Drone and ardrone_autonomy package. For that I'm planning on tracking a four red dots target to use as reference for the error ...
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1 answer
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arbotix_python arbotix servos not recognized

Hi, I have purchased an arbotix robocontroller but the servos are not being recognized when I run arbotix_python. I am able to successfully compile and upload the ros.pde firmware without error (...
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