Robotics Stack Exchange
Robotics Stack Exchange

Most Popular

more tags
1500 questions
4
votes
5 answers

Finding inverse kinematics algorithm for a specific manipulator

I need to find a way to solve invrese kinematics for Comau SMART-3 robot. Could you give me a few hints where to start looking? I have no idea about robotics and I couldn't find an algorithm for this specific robot.
abece
  • 87
  • 1
  • 2
4
votes
1 answer

Why does a motor does not run when a resistor is connected in series between the supply?

I decided to remove the battery (1.6 V 1600 mAh) from my trimmer and to power it via an old mobile charging cable (6 V 800 mAh). So I built a voltage divider circuit, which gave me nearly 1.6 V but when connecting to the motor, the motor does not…
mythili charan
  • 95
  • 6
4
votes
1 answer

How to perform decoupling between decision making and action execution in ROS2?

Hi I'm making a robot using: ros2 foxy OS Ubuntu Linux 20.04.2 LTS (Focal Fossa). Linux 5.8.0-59-generic I built an Action based on the tutorial Building an Action Server and Client. Then expanded it using Serial and successfully managed to send…
rasa911216
  • 75
  • 5
4
votes
1 answer

What is the purpose of electronic braking in motors?

I have a Micro Magician v2 micro controller. It has a A3906 Dual FET “H” bridge motor driver built in. In the manual it states "Electronic braking is possible by driving both inputs high." My first question is, what is the purpose of these brakes?…
Titan
  • 285
  • 1
  • 5
4
votes
2 answers

What's the difference between factor graph optimization and bundle adjustment?

I see that in SLAM literature, factor graph optimization is frequently used. While in Structure from Motion (SfM) literature , they usually use bundle adjustment. What's the difference between the two methods? Furthermore, can we implement one…
zhouch
  • 41
  • 2
4
votes
1 answer

Low speed control of bldc motors

I'm having a problem with controlling my BLDC motor when starting up and when running in low rpm. I have a custom board to measure rotation of the motor using an optical sensor and send servo pwm commands to an esc. The problem is, that I can't…
cube
  • 729
  • 6
  • 17
4
votes
1 answer

Understanding Arduino bootloader

That is what I came to understand while reading here and there about flashing a new bootloader/understanding what a bootloader is etc etc The bootloader is supposed to be the first thing that runs when I power up my Arduino Duemilanove (or micro…
Thomas
  • 143
  • 5
4
votes
2 answers

Visualizing kinect data on rviz

I am a beginner of ROS, Kinect and Ubuntu. What I want is to visualize Kinect's data on rviz environment then run object recognition on it. I've tried a few tutorials but had no luck. All I got was an empty rviz world. Since I am a beginner I would…
SpiderRico
  • 142
  • 1
  • 6
4
votes
5 answers

Quadcopter instability with simple takeoff in autonomous mode

I'm trying to get a quad rotor to fly. The on board controller is an Ardupilot Mega 2.6, being programmed by Arduino 1.0.5. I'm trying to fly it in simple autonomous mode, no Radio controller involved. I've done a thorough static weight balancing of…
metsburg
  • 419
  • 1
  • 5
  • 12
4
votes
2 answers

Stationary/inertial reference frame

In Modern Robotics by Kevin Lynch, there is a term "stationary" frame, but this is never defined. Googling shows that this is synonymous with inertial frame. Apparently inertial frame means rigidly attaching an accelerometer to a frame would show…
user3180
  • 161
  • 4
4
votes
3 answers

Algebraic and geometric in inverse kinematic

I'm just wondering that is there any case that when algebraic way can't solve the problem while the geometric can ? Cause I'm working on a 2DOF robotics arm This one, I know the length of L1 and L2, location that I want for the end effector, then I…
Xitrum
  • 183
  • 4
4
votes
1 answer

Universities offering courses about Drones (Unmanned Aerial Vehicles [UAVs])

I am trying to gather some information about university courses offered about drones (or Unmanned Aerial Vehicles). At the beginning, I thought that I would have found way more than what I found and instead I could notice that most of the…
desmond13
  • 211
  • 2
  • 5
4
votes
1 answer

Defining frames for 5DOF robotics arm

For examples if i have this robotic arm: Example, for the base rotation (5th DOF in the clip at 0:58), we know that the Z axis for that joint will be the same as the Z axis for the base frame{0}, but I don't know about Y and Z axises of the base…
Xitrum
  • 183
  • 4
4
votes
1 answer

sending and receiving parameters to ardupilot

I am interested in getting an arducopter with an ardupilot(APM). I read through the documentation and from what I understand, ardupilot is the low level hardware and firmware that directly controls the motors of the arducoptor. I would like to know…
Jay
  • 141
  • 5
4
votes
2 answers

POMDPs in robotics

POMDPs are used when we cannot observe all the states. However, I cannot figure out when these POMDPs can be useful in robotics. What is a good example of the use of POMDPs? (I have read one paper where they used them, but I didn't find it obvious…
guest1
  • 41
  • 2
1 2 3
…
99 100