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2
votes
0answers
21 views

Choosing right motors for self-balancing robot [closed]

I’m looking for right motors for my first self-balancing robot. Design assumptions: robot height: around 120-200 mm robot weight: around 600-800 grams wheels: 80x10 mm or 90x10 mm battery voltage: ...
0
votes
2answers
26 views

I wanna make a raspberry pi car using an RC car. I would like to know if the servo multiplexer is necessary?

So I'm working on a project and it involves making a raspberry pi car, be it from scratch or with the help of can rc car. I chose the latter. Now the problem is I don't really have servo multiplexers ...
0
votes
0answers
8 views

What is the ~tf_prefix parameter does?

I have a TurtleBot3 Robot and when I’m trying to do this command to start the nodes (The ROBOT is real) roslaunch turtlebot3_bringup turtlebot3_robot.launch I’m ...
0
votes
2answers
33 views

how to implement a wall following controller for a TurtleBot3? (ROS - python)

I want to implement a wall following controller for my TurtleBot3 (with ROS system). sensors which I have on the robot: lidar(360) and optional 2 ultrasonic sensors on the side (1 on left and the ...
0
votes
1answer
39 views

Plot a map using wheel encoder and IMU data

I want to plot a map( with matplotlib or any other library ) using a wheel encoder and IMU data. Eg:- For every 10cm robot moves it should draw line (in a graph) and draw angles depending on the data ...
0
votes
1answer
41 views

What robotic skills can I develop when working as a robot operator? [closed]

I find myself very interested to work in the field of robotics though my background is not robotics, I had a degree in Physics, master 1 in Hydrodynamics and this year I have studied just one semester ...
0
votes
2answers
58 views

Multiple robots performing a set of tasks (Optimization)

Consider a situation where you have a 'm' number of robots and 'n' number of tasks. Each task is at a different location. What optimization algorithm should I use in order to assign a set of tasks to ...
0
votes
0answers
22 views

How to do mechanical calculations for a towing robot?

I am making an automated guided vehicle AGV will tow standard shopping carts each will weighs 20-30kg I hope to use 12V DC gear motors 100rpm torque 20kg.cm (assume the floor is smooth and flat) I ...
0
votes
1answer
86 views

What is the difference between the pose of a robot and the configuration of a robot?

Do "configuration" and "pose" means the same thing? If not what is the difference?
2
votes
3answers
113 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 ...
1
vote
0answers
31 views

TGY-6114MD Servo motor needs push to start

I currently have an inspection robot deployed in a remote part of Africa that has a failing Turnigy TGY-6114MD servo. The issue appeared randomly. The servo won't respond to commands unless given a ...
0
votes
1answer
145 views

Omni vs mecanum wheels for drawing robot

I'm designing a mobile robot which will have to draw some lines (straight and/or curly) on the floor while it moves. The floor will always be flat with almost no obstacles. The robot will have four ...
0
votes
1answer
69 views

Path planning of wheeled robot [duplicate]

let's say the robot Looks like this (an usual robot arm with 4 wheels) : In this case as far as I know, the idea of path planning is just to compare the actual position x with the desired position ...
2
votes
0answers
34 views

Create path with minimum curvature for Ackerman drive

I'm trying to create a trajectory between two given poses for an Ackerman drive. The poses are defined as follows: Current Pose position $(x_0, y_0)$ rotation on z-axis $\theta_0$ Final Pose ...
1
vote
2answers
52 views

sampling algorithms in motion planning and local minima

I am trying to run RRT algorithm for motion planning for a quadrotor. The quadrotor ends up sometimes in corners without reaching the goal. I realized from sources online, that it is due to local ...
1
vote
0answers
156 views

How does one setup an ESC to drive a wheel-hub motor?

I have 2x 350W wheel-hub motors taken from a self-balancing scooter, or hoverboard. My intention is to use the two of them to drive a homemade R2-D2. However, some difficulties have been encountered ...
0
votes
1answer
45 views

How Do You Program the SR04 Ultrasonic Sensor?

Dear Robotics Community, I am participating in a Robotics tourney that will start in a few weeks. The challenge I signed up for is to deliver and dump ping pong balls to a box. I already have my ...
2
votes
2answers
241 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 ...
0
votes
2answers
116 views

Permanent Magnet DC Motor Calcuations

I have to determine speed and torque suitable for my combat robot. I've done some calculations and I need to know whether they're right or not (because they don't seem to be right). Suppose I have ...
0
votes
1answer
61 views

Is there any robot stability control equation that describes the relation between velocity of the robot and its orientation?

Let’s assume at time t a moving robot (e.g. PIONEER 3-DX) changes it’s steering angle by $25^{\circ}$. Obviously, in order to maintain stability and avoid overturning, the robot must reduce its ...
1
vote
1answer
2k views

Implementing pure pursuit problem in robot navigation? [closed]

I would like to implement pure pursuit waypoints navigation. we know that, look ahead distance=look ahead gain*vehicle forward velocity How can I calculate look ahead velocity gain/look ahead gain? ...
1
vote
2answers
168 views

Choosing motor to buy after calculations

I am building a two wheeled robot which will have: max speed of 10km/h and acceleration of 0.5m/s² can climb 12° slopes weighs at most 30 kg wheel diameter is 50cm By doing the calculations myself, ...
0
votes
1answer
45 views

Meaning of symbol, 'curly N' in the equation of Linear Gaussian system dynamics

In the article of Topological Based Representation(Page no. 12), the equation of the Linear Gaussian system dynamics is given as In above equation what is the meaning of 'curly N'?
2
votes
1answer
53 views

Meaning of 'sign' in Writhe Matrix

Following is the equation of Writhe matrix from the article Topology based Representation(page no. 6). What is the meaning of 'sign' in the second part of this equation? I am not sure if this is some ...
3
votes
2answers
449 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') + ...
2
votes
3answers
3k views

How to find kinematics of differential drive caster robot?

I'm working on a little project where I have to do some simulations on a small robot. I my case I'm using a differential-drive robot as one of the wheels of a bigger robot platform (which has two ...
0
votes
1answer
1k views

How can I measure the actual speed and distance traveled of the robot with an external setup? [closed]

Good day to all. First of all, I'd like to clarify that the intention of this question is not to solve the localization problem that is so popular in robotics. However, the purpose is to gather ...
1
vote
2answers
158 views

How would I replicate a tank/zero-turn steering system in a small robotic vehicle?

I'm working on a project that requires me to build a small vehicle (footprint of ~ 14 x 14 inches, less than 6.5 pounds) that can traverse sand. For the steering system, I was thinking of replicating ...
5
votes
1answer
6k views

How to program a three wheel Omni?

I have created a three wheeled omni robot like the diagram below. Now I am unsure of how to program it. I want to use a single joystick so one x and one y value. The values for x and y are between -1 ...
4
votes
1answer
177 views

Sensors' field of view in car driving

I want to develop an autonomous driving RC car. For detecting obstacles, I plan to mount 3-5 ultrasonic sensors in the front and in the back the car. What is the minimum necessary combined field of ...
1
vote
1answer
896 views

Torque of coreless DC micro motor

I would like to build a small two-wheeled robot similar to the one shown here. In order to keep the robot small, I intend to use two coreless micro motors like the one shown bellow. The power source ...
1
vote
0answers
115 views

Angles in a Rocker bogie system

How do you select the following two angles in the design of a Rocker bogie system: Angle between two arms of the main rocker, and; Angle between two arms in the bogie.
1
vote
0answers
48 views

Heavy omnidirectional platform suspension

I'm planning to build an omnidirectional platform that will support about 180kg robotic arm. The platform will be equipped in meccanum wheels. I would like to have some kind of suspension to avoid ...
2
votes
1answer
367 views

Rocker bogie suspension system - pitch angle

What does this sentence mean : "The chassis maintains the average pitch angle of both rockers." Put in other words, " the pitching angle of the chassis is the average of the pitch angles of the two ...
2
votes
3answers
2k views

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 ...
0
votes
1answer
38 views

Error as a State space

I am reading the following research paper regarding Trajectory tracking of mobile robots. http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=5415188 There are two things at the start of the ...
0
votes
2answers
861 views

Looking for a cheap(ish) micromouse that I can program with C/C++ [closed]

I'm looking to buy a micromouse (i.e. a small single-board unit with wheels and IR sensors that can move around freely). I've done a lot of searching but have only found resources relating to building ...
2
votes
2answers
84 views

Detect road surface in a traffic scene point cloud

I want to analyze a traffic scene. My source data is a point cloud like this one (see images at the bottom of that post). I want to be able to detect objects that are on the road (cars, cyclists etc.)....
4
votes
1answer
222 views

Quadrature Encoder Counts

Actually , I have been since two weeks looking for convinced and final solution for my problem , actually I am completely lost , I am working on mobile robot (Rover 5) with 2 motors , 2 encoders . the ...
7
votes
4answers
932 views

What is the technical name when robot wheels are aligned to perform spot turn?

I have a robotic simulator that enables a 6 wheel rover to perform spot turn. To prepare the rover to spot turn, I have to arrange/align the wheels in such a fashion: ...
0
votes
1answer
787 views

Matlab for moving a robot towards the detected block

the matlab code is used to detect red colored object, but i want to control a bot to move towards the detected object. just need a simple algorithm or idea, controlling the servo i will be able to do ...
0
votes
2answers
1k views

Position Control of an Omni Wheel Drive Robot

I want to create a robot that will navigate on a desired path! That path can be a straight line or a circular path with a given radius. I will use 3 or 4 omni wheel drive platform and for positioning,...
0
votes
2answers
545 views

Programming language? [closed]

In general, what is a good programming language for robotics? I am a starting robo nerd and don't know anyone who would know things like this.
2
votes
3answers
2k views

Connecting a Raspberry Pi to a roomba via an FTDI cable

I have a Raspberry Pi with this FTDI cable and a Roomba 560. The Roomba has an SCI port to allow for control of the roomba via serial. I installed the PySerial library on the pi and send valid ...
0
votes
0answers
52 views

Which Kinect to a movement base? [duplicate]

I am making a mobile base for a robot with wheels. I want to use a Kinect like a movement sensor (to avoid obstacles, recognition of people, etc...) but I read that there is 2 models, the 360 and the ...
3
votes
1answer
681 views

Rocker bogie suspension stability

From the designs usually shown of rocker bogie systems, the whole weight of platform seems to be supported by only one rod, be it differential bar or gear. Isn't this a bit unstable system because if ...
1
vote
0answers
302 views

Motor Controller with micro USB interface [closed]

I am a Robotics enthusiast and planning to make a small and simple four wheel car whose motors are supposed to be controlled by an Android device housed inside the car by means of the micro USB port ...
10
votes
4answers
6k views

How to make an “invisible line following robot”?

I would like to build a robot which follows a virtual path (Not a visible path like a 'black line on a white surface', etc). I'm just enthusiastic by seeing some sci-fi videos which show robots carry ...
6
votes
2answers
234 views

Protecting electronics against voltage/current extremes and bad polarity

I have built a robot from a wheelchair that has worked very well thus far. It is now time for me to take the next step. I need to implement a permanent power circuit with proper protection. The ...
16
votes
2answers
18k views

Wheels vs Continuous Tracks (Tank Treads)

I'm building a small robot using some cheap Vex Robotics tank treads. However, my choice of picking tank treads is almost purely based on the fact that they seem like more fun than wheels. I don't ...