Robotics Stack Exchange
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Linear slider motor mount location - Pros/cons

I'm currently designing a linear camera slider, that will be used to hold camera equipment weighing just about 15 Kgs including all of the lenses and monitors and everything else. For those who don't know what a camera slider is, it's a linear…
dsignr
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Use linear quadratic regulator to minimize output error

I would like to create an Infinite-horizon, continuous-time LQR with a cost functional defined as $$J = \int_{0}^\infty \left( e^T Q e + u^T R u \right) dt$$ where e is the states' error $x-x_d$, but I have trouble concluding to the appropriate…
Controller
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Can we use this line sensor as a proximity sensor?

I have an RSL Line Sensor which is designed to distinguish black and white lines. It detects white surface and gives me digital 1 as output, with 0 in case of black, but the surface needs to be close to it. As it uses infra-red-sensors, I wanted to…
nishantbhardwaj2002
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Purpose of programming an ESC

I am planning to buy an ESC for my tricopter setup. What is the purpose of programming an ESC? I am cost effective and is it really necessary that I should necessarily buy a programming card to program my ESC for my model?
Shiv Ram
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Assumptions about the nature of landmarks in SLAM algorithms

I'm trying to understand the role of landmarks in SLAM algorithms. I've glanced over a few books concerning landmark based SLAM algorithms and I've come up with a rudimentary understanding which I believe is flawed. How I think SLAM works: As I…
Paul
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Why models are not perfect to represent robotic environments?

Sebastian Thrun says in his paper on Particle Filters that - no model however detailed fails to represent the complexity of even the simplest of robotic environment. What does he means by this? Can someone please elaborate?
Ambidextrous
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Single-shaft vs Double-shaft motors

I am trying to make a line follower robot and I need help regarding the type of dc motor to use. So we have a single shaft BO Motor and a double shaft BO Motor. Can anyone help me understand what is the difference between the two? Here's the link…
Divyansh
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EKF SLAM and Mahalanobis distance?

So far I have done EKF Localization (known and unknown correspondences) and EKF SLAM for only known correspondences that are stated in Probabilistic Robotics. Now I moved to EKF SLAM with unknown correspondences. In the algorithm in page 322, 16.…
CroCo
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Dynamic tracking precision of UR5/10

I am willing to use a universal robot arm (UR10) in a path following mode. i.e. I have a desired trajectory for the robot's effector and I would like the effector to follow it as close as possible. The specs here give a repeatability of +-0.1mm.…
arennuit
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PID in a system with pole at origin

I've seen in a lot of places some methods of tuning a PID controller. Most of them will say that one should apply a step input to the system and based on that response you can tune the PID parameters following some rule of thumb. But what about a…
FELIPE_RIBAS
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What is the difference between the two different types of Mecanum wheels?

While looking at Mecanum wheels, I noticed that there are two different designs that are popular. One type holds the rollers in between the wheels frame, and the other holds the rollers from the center. Is there a significant advantage to using one…
Ahmed
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sparse matrix in EKF SLAM

I've successfully done with EKF Localization Algorithm with known and unknown correspondences that are stated in "Probabilistic Robotics". The results make perfect sense,so I can estimate the position of a robot without using GPS or odometry. Now…
CroCo
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Stereo camera baseline not needed for calibration?

I am doing stereo camera calibration as described in this blog post. I wonder I do not need to input camera baseline for the calibration. The fact probably goes back to some very basic mathematics of triangulation. Can someone explain?
Kozuch
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Robot Serial Communication Error

We are using a Koro robot for our PC based automation solution. But sometimes the robot is getting the command but refuses to respond. Then I get a serial communication timeout error. The error is happening for a random type of commands and it is…
Jaggi
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Electronic Speed Control Concepts

I am a programmer who has never worked with electronics before. I am learning the concepts and hoping to build a quadcopter, with the control software entirely written by me. Motor control seems to be the most important part. Is it true that the…
necromancer
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