Questions tagged [mobile-robot]

A robot which is capable of moving from one place to another, usually of its own volition.

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57 views

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

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 ...
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1answer
206 views

How to avoid matrix singularity in GraphSLAM

I am trying to implement GraphSLAM from Sebastian Thrun's paper, The GraphSLAM Algorithm with Applications to Large-Scale Mapping of Urban Structures. When I compute the inverse of my information ...
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253 views

Area coverage of autonomous underwater robot

I'm currently working on an autonomous underwater cleaning robot and would like your input on some navigation algorithms Problem: Wash the inside of big, open and filled tank, e.g. water storage ...
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1answer
145 views

Forward kinematics: Why ω should remain same?

Can anyone please explain me these lines found on page 5 of Kinematics Equations for Differential Drive and Articulated Steering by Thomas Hellström? Note that plugging in $r$ and $v$ for both ...
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2answers
1k views

EKF-SLAM initialize new landmark in covariance matrix

I am trying to implement an EKF-SLAM using the algorithm for unknown correspondences proposed in the book "Probalistic Robotics" by Sebastian Thrun in Table 10.2 . By now I understand actually all ...
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2answers
795 views

Transformation a robot in 2D?

I'm watching this video at 36.00 min. The guy gave an example but I'm not sure what is the problem. He stated that if we want to move a robot then we should to the following for inhomogeneous case, ...
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1answer
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Questions about Irobot Create

I'm interested in getting a Create for a project I'll be working on, and wanted some information about it from somebody that already has one: How much weight can it safely carry? I talked with Irobot'...
4
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1answer
207 views

EKF-SLAM: Shrink covariance matrix on one direction

I have implemented an EKF on a mobile robot (x,y,theta coordinates), but now I've a problem. When I detect a landmark, I would like to correct my estimate only on a defined direction. As an example, ...
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Alternative to ROS? [closed]

This might be a tricky question, but having dug in deep with ROS I am noticing the complexity that one has to deal with. Simple Arduino programming is much simpler but of course can’t do many useful ...
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3answers
156 views

Is modelling a robot and deriving its Equations of Motions more applicable to a system that is inherently unstable?

As someone who is new and is still learning about robotics, I hope you can help me out. Let's say I have two systems: (a) Inverted Pendulum (unstable system) (b) Pole Climbing Robot (stable system) ...
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Which is a good and cheap 3D LIDAR or other options? [closed]

Our team is planning to go for European Rover Challenge (ERC) 2018 for which we are designing an Autonomous rover. In order to implement SLAM, we need a way of mapping (with a range of atleast 2-4 ...
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1answer
757 views

What is the difference between Task-Level and Joint-Level Control Systems?

While doing a literature review of mobile robots in general and mobile hexapods in particular I came across a control system defined as "Task level open loop" and "Joint level closed loop" system. ...
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Collaborative Behavior: Implementing a Bucket Brigade With Robot Arms

I was wondering whether something like this is possible: A block of ice(say) needs to be transferred piece by piece from a source to a destination with the help of 5 robots standing in a straight line ...
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298 views

Weird magnetometer values

I bought a 3-axis magnetometer (Similar to this one ) And plugged into an Arduino in order to read the heading value. I mounted it on my robot and I drove with the robot for around 30 meters, turned ...
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1answer
335 views

image processing

I am making a Robot goalie, the robot is supposed to detect whether a ball has been thrown in its direction , sense the direction of the ball and then stop it from entering the goal post. A webcam ...
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1answer
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Cheap and efficient 3D sensor?

I'm searching for a cheap (under 100$) and efficient 3D sensor, which detects obstacles and moving objects, for robot applications like quadrotor navigation, swarm robotics, etc. Can you suggest a ...
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Particle filter weight function

I am trying to implement a particle filter in MATLAB to filter a robot's movement in 2D but I'm stuck at the weight function. My robot is detected by a camera via two points, so a single measure is a ...
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3answers
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Iterative Closest Point for 2-D LIDAR Data

I have two 2-D point clouds obtained from LIDAR (Light Detection And Ranging) scans at two different poses (positions and orientations) inside a circular structure, where a small object (vertical ...
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2answers
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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698 views

How to measure pull force on a (kite) rope?

I'm building a kite flying robot, in which I've already got some sensors built in. I now also want to measure the pulling force on the rope which is attached to the kite. So I thought of attaching a ...
3
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1answer
142 views

How can we solve the problem of robot size in sensor based motion planning?

As you know in Bug algorithm there is a simplifying assumption that says the robot has no size and can fit between any arbitrarily small gap in the map. How can we overcome the challenge of robot size....
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3answers
1k views

How to combine odometry information with time-shifted information from IMU?

I'm working with a differential-drive robot that has odometry measurements from wheel shaft encoders and heading information from an IMU (I'm using BNO055 in IMU mode to get Euler angles, primarily ...
3
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3answers
121 views

Accounting for error in multiple electric motors

Our goal is to drive an autonomous robot with a differential locomotion system using two identical electric motors and an Arduino Uno (1 for each wheel). From our understanding, over time the motors ...
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248 views

Neuromorphic Engineering and Robotics

I have been into a boggling paper research on neuromorphic engineering and its implications on robotics applications, lately. It is relatively a less applied field and full of academic papers and ...
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5answers
576 views

Using vision for Monte-Carlo localization

From each step of my vision code I am able to get around 400 coordinates of where the robot thinks the walls are I want to integrate this into Monte-Carlo observation step. I'm storing the map of ...
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1answer
113 views

Calculate information matrix for graph slam

0 I am new to SLAM. I am working on graph slam where I need to do pose graph optimisation. For this requirement information matrix is required between two edges for which the transformation has ...
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1answer
77 views

High power jumping mechanism in small robots

I recently saw this video on YouTube featuring a jumping robot: 5 Fastest Robots In The World I was curious how this is accomplished mechanically? Do they wind a strong spring or use some sort of air ...
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74 views

2D Transformations as Affine Matrices

I have found the following exercises about 2D Transformations as Affine Matrices. I am stuck at the second exercise that goes as follows: The 2D pose of a robot w.r.t. a global coordinate frame is ...
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3answers
907 views

Mobile robot speed synchronization for straight line moving

I would like to build a simple mobile robot with differential wheels, and I am currently design the wheel speed controller. After reading some papers, I noticed that to realize a straight line moving, ...
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2answers
408 views

Motion planning and robot controlling

I am stuck with understanding how can I make my robot move along planned path. For instance, if we have a grid map of an environment and applied, for example, A* to plan a path then after that we have ...
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1answer
425 views

Examples of Zeno Behaviour in the Real World

Zeno Behaviour or Zeno Phenomenon can be informally stated as the behavior of a system making an infinite number of jumps in a finite amount of time. While this is an important Control system problem ...
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1answer
146 views

Mobile robot algorithm implementation error

I am working in reproducing a robotics paper, first simulating it in MATLAB in order to implement it to a real robot afterwards. The robot's model is: $$\dot{x}=V(t)cos\theta $$ $$\dot{y}=V(t)sin\...
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2answers
290 views

Real-time object classification for an indoor autonomous quad-rotor

I am designing an indoor autonomous drone. I am currently writing an object classification program in OpenCV for this purpose. My objects of interests for classification are: ceiling fans; AC units; ...
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1answer
2k views

Tf frame origin is offset from the actual base_link

I have built my differential drive mobile robot in solidworks and converted that to URDF file using soliworks2urdf converter. I successfully launched and robot and simulated with tele-operation node. ...
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2answers
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iRobot Create Serial Cable for Turtlebot I

I need an iRobot Create Serial Cable (one end 7-pin Mini-DIN Connector and the other end is USB) for Turtlebot I. How can I connect my bot to my PC?
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Autonomous car steering using IR sensors

I want to steer a RC car in a straight line.The car has 4 sharp IR sensors on each corner of the car to help it steer the corridor.The corridor is irregular and looks something similar to the picture ...
3
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1answer
36 views

Do diagonal mecanum wheels require the rollers to cross the center of the robot

I'm currently in the process of making some changes to my robot to use mecanum wheels. The kinematic models I've seen assume the 45 degree roller from one diagonal wheel to the other, crosses the ...
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1answer
55 views

Do mobile robots use variable transmissions?

I've built a simple robot that can move. I'm using brushless motors. I've realized that at slow speeds the motors pull a lot of current. I didn't understand the power / current / efficiency charts ...
3
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1answer
219 views

how to use ROS navigation stack with 4 wheeled robots

I have a 4 wheeled toy car, with 5 motors, one on each wheel and one is used for steering. How can I use ROS navigation stack with this robot since navigation stack is used with differential drive ...
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3answers
116 views

Interference caused by multiple robots during task completion

Suppose there is an area to survey. If we deploy one robot it takes time T to sweep the area. Now if we deploy 2 robots, we would expect it to take time T/2. However in reality, because we are sending ...
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1answer
365 views

FastSlam2.0: ICP Scan Matching vs Odometry? What is the typical time step?

When working with a FastSlam2.0 algorithm, ICP Scan Matching is supposed to give more accurate measurements than odometry. The problem is, that given some noisy measurements from the laser scanner, ...
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1answer
437 views

Wheel odometry simulation using ground truth

I'm tracking the state of a robot $X=(x,y,\theta)$ where $x$ and $y$ are the ground coordinates and $\theta$ the heading angle. I have the ground truth states $X_{gt}=(x_{gt},y_{gt},\theta_{gt})$. I ...
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2answers
716 views

Difference between g-value and rhs-value in Lifelong Planning A*

What is the difference between g-value and rhs-value of Lifelong Planning A* algorithm? According to this link, D* Lite, g(s) directly correspond to the g-values of an A* search, i.e. g(s) = g(s') + ...
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why is quadrotor motion planning hard?

With introduction of incremental sampling algorithms, like PRM and RRT planning in higher dimensional spaces in reasonable computation time has become possible though it is PSPACE-hard. But why is a ...
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1k views

How do I choose the best filter for dead reckoning with an IMU?

I'm searching filter to reduce noise and smooth the signal while dead reckoning with an IMU (6dof gyro+accelerometer). What are the differences/advantages/disadvantages of the following filters: ...
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1answer
64 views

Are robotic pollenators being designed?

With the bee hive collapses, growers are desperate for pollenation options. Is anyone working on swarms of tiny flying robots to augment the bees? They could look for a certain color, poke around ...
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2answers
187 views

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 ...
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2answers
966 views

Connect sensors to beaglebone/arduino in a complex robot

I'm building the biggest robot I've ever done. The hardware I have so far is as follows: HCR-Platform from DFRobot as a base x2 12V 146Rpm DC motor with two phase hall encoder x7 Sharp 2Y0A21 IR ...
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1answer
361 views

Dead reckoning on a car-like robot with a gyro and only one encoder

Recently I began to build a car-like robot and I stumbled upon dead reckoning. I use one motor for steering and one for traction. I want to be able to get the position of the robot. From what I have ...
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3answers
240 views

Using robotic simulator for prediction step in probabilistic localization approaches

Probabilistic localization approaches like Kalman or Monte Carlo benefit from an accurate prediction step. The more accurate the prediction step, the more accurate is the belief of the robots pose. In ...

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