# All Questions

2 views

### How to use Kinect Fusion to build beautiful model?

I've seen the model constructed in this paper and this paper, it is beautiful. I tried to use Kinect Fusion Explorer to build my own model (I put my model on a transparent stand on a table), when ...
22 views

### SLAM without landmarks using sonar

I'm currently programming an app for a robot and I'd like to make him map a zone and then make him move autonomously from one point to another. I have to solve a SLAM problem, but the biggest matter ...
7 views

### Controlling Dynamixel servo wirelessly using Arduino Mega

I am planning to control multiple Dynamixel servos (MX28T or MX-64T) wirelessly using Arduino Mega. Since this servo uses serial communication, I need an additional serial port to interface with Xbee ...
13 views

### How to shop for camera hardware for robotics applications?

I am working on a computer vision project using OpenCV on a Linux x86-based mobile robotics platform. The stock web camera I've been using has no exposure control, which results in largely saturated ...
40 views

### Finding a light load high precision servo motor

I have a project that requires me to be able to accurately and repeatedly rotate an object 120 degrees. The object is small and lightweight (let's say several grams). The axis does not necessarily ...
44 views

### Where do roboticists look for used sensors/hardware?

I recently built a self-driving vehicle-type robot for a competition, and am looking to sell sensors (GPS, INS, etc.) used in order to have money for the next project. Is ebay where people tend to go ...
31 views

### 12V compressor and air pressure control

I am trying to make a simple robot with few functionality for someone, one of these functionality is inflating a balloon inside the robot, I know how to control a compressor using Arduino but the ...
47 views

### What mechanical parts can be attached to DYJ48 stepper motor?

Sorry I am asking a mechanical question here, but, after all, where else people have experience with using motors? If there is a better forum for this, please do guide me. Everywhere I've seen ...
15 views

### Implement a sharp right turn using atmega8 for line follower

I am new to AVR programming, and I am trying to implement a sharp right turn using atmega8. I was able to implement the straight line path but cannot implement a sharp right turn. Here is my code: ...
60 views

### Control a 2.4 Ghz AR Drone from the computer

I had a Doyusha Nano Spider R/C mini-copter, it's controlled by a 4ch joystick 2.4 Ghz. I look for a low cost method to control it from the computer. The software is not a problem, but how can I ...
505 views

### Seeking dirt cheap, wheeled, programmable robot

I was playing the old "confuse the cat with a flash-light" game, when I thought that I might like to program a confuse-a-cat robot. Something, probably with tracks, which can right itself if he flips ...
52 views

### Controlling multiple Arduinos wirelessly

I am designing a experiment of controlling 6 small wind turbines wirelessly. For each wind turbine, I need to measure power time series (or voltage or current time series) from the generator, and ...
21 views

### Forward Kinematics/D-H parameters for perpendicular joint axes

I am trying to compute forward kinematics of the Kuka youBot using DH convention: http://www.youbot-store.com/youbot-developers/software/simulation/kuka-youbot-kinematics-dynamics-and-3d-model The ...
56 views

### Is increasing gyro , accelerometer sensor range is good or bad ? how does it affect the accuracy

I've been using mpu6050 IMU unit ( gyro + accelerometer ) I found that I can set acc range to +/- 2g or 4g till 16 g and same for gyro +/- 250 deg/sec , 500 deg/sec and so I know that they are ...
79 views

### Deducing single wing plane transfer function Aka Transfer function estimation through set of points

I'm trying to control a plane via roll using PID controller , I had a problem finding the transfer function thus I used the following method :- Fix the plane in an air tunnel change the ...
46 views

For my quadcopter, i turn on the quadcopter while letting it stable on the ground. But i see that the Roll, Pitch fluctuate with the max difference being 15 degree. When i protect the sensor with soft ...
15 views

### Choosing ESC for my tricopter

I am about to buy ESCs for my first ever tricopter. I know there are 3 types of ESC available in store. 1.That is card programmable - affordable 2.That is programmable using Tx stick( the dealer ...
15 views

### the uncertainty of initializing new landmark in EKF-SLAM

In EKF-SLAM (based-feature map) once the robot senses a new landmark, it is augmented to state vector. As a result, the size of the state vector and the covariance matrix are expanded. My question is ...
61 views

### Do simple, non-sonic, omni-directional rangefinding beacons exist?

I am on a robotics team that plans to compete in a competition where one of the rules is that no sort of sonic sensor is allowed to be used. I guess that limits it to some sort of EM frequency right? ...
44 views

### For robot wheel control : Brushless DC motor or Servo Motor?

Simply, when to use brushless dc motor and when to use Servo Motor ? what are the differences , specially when adding an encoder to the dc motor you can have the position and it will be similar to ...
29 views

### Robotc color sensor error

I am trying to write a simple program where the robot(Lego NXT2) will follow a blue line. ...
44 views

### Particles not behaving correctly in the implementation of particle filter

I am implementing a particle filter in Java. The problem with my particle filter implementation is that the particles suddenly go away from the robot i.e the resampling process is choosing particles ...
14 views

### how the error of estimation of a landmark in slam looks like?

Let's say there is a landmark (based-feature map for EKF SLAM) located at <20,20> (this is the true location which is not accessible in reality). The robot re-observes this landmarks many times. ...
21 views

### Two State Linear Actuator

I need two state linear actuator. You can have a look at the picture to understand what I mean. Don't care about the hand ! I need to electrically move the things like this squares up and down. ...
103 views

### What are some low cost alternatives for lidar?

It need not be as effective as lidar or it may have some disadvantages when compared with lidar. What are the probable alternatives? Edit: I'm intending to use it outdoors for navigation of ...
36 views

### how to plot a 10*10 grid map and how to number the grid cells?(attached the model of grid) [migrated]

regarding my assignment work i have to plot 10*10 grid with cells labelled in numbers.now only i have started to learn mat lab.i have tried lot of methods, to plot the grid. but none gave solution to ...
32 views

### 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 ...
37 views

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 ...
17 views

### kinect - development kit to aid obstacle-avoiding robot?

Some friends and I are interested in working on a robot. I know little to nothing about robotics, but do have a lot of experience with programming. Before we start, I am hoping that I can find some ...
37 views

### Can't Read current on Pololu Dual MC33926 Motor Driver Shield for Arduino

I purchased a Pololu Dual MC33926 Motor Driver Shield for Arduino, and for some reason I cannot read current from the motor controller. On the Serial.println() it just prints weird data (garbage), and ...
24 views

### 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 $x-x_d$, ...
31 views

### Laser Beam based model probability in case of single particle

I am trying to calculate likelihood of laser scan($Z$) at give pose($x$) with known map ($m$) using beam based model $P\left(z_t|x_t,m \right)=\prod_{i=1}^{n}P'\left(z_i|x_t,m \right)$ My scan ...
26 views

### Are consumer grade CNC machines capable of cutting tile?

I'd like to slice and dice floor tile into pieces so I can arrange it in geometric patterns. I have CAD designs for the parts. Would any consumer grade CNC machine be capable of doing the job?
45 views

### What is a PID as is related to quadcopters

I'm trying to make a Quadcopter from scratch, I have a fair amount of experience with adruinos, and I'm trying to understand how to necessary systems work, and I can't seem to figure out what PID ...
34 views

### Non-linear complementary filter on so3: Corrected equations?

While reading the paper "Multirotor Aerial Vehicles: Modeling, Estimation, and Control of Quadrotor" by Mahony, Kumar and Corke, I stumbled across the following equations for a non-linear attitude ...
56 views

### PD Algorithm for a Quadrotor [Simulation]

I have a big problem trying to stabilize a quadrotor with a PD controller. The model and the program has been written in C++ and the model dynamic has been taken from this source in internet: Well, ...
36 views

### Reverse lift mechanism

I have made a RC robot from a wheelchair and I'm planning to attach a snow plow. I'm wondering if there is any mechanism that would be able to lift the plow when reversing. I have only 2 channel ...
42 views

### Using kinect for medical application but without computer. Is it possible?

I have to use kinect for an application. However, the final work must be mobile: it means no computer. Consequently, I thought using a microcontroller to handle data from kinect. But is it possible? ...
111 views

### How to make a robot which will sense badminton shuttle cock?

I am designing a badminton playing robot which will have 4 wheels....how to sense the badminton shuttle cock so that it will detect and hit it back.which motors and electronic circuit should i use to ...
106 views

### What are the calculations for a badminton robot and mechanisms?

I am designing a badminton robot but i am very confused about mechanisms needed for a badminton robot and various calculations needed for millisecond response.I am also confused about calculations ...
89 views

### How to control an Arduino Board with wireless PS3 controler?

I'm currently building a hexapod bot, composed with an Arduino Mega board and an USB SSC-32 (from Lynxmotion). But now I want add a PS3 wireless controller to move my hexapod, I have made some search ...
38 views

### Odometry of mobile Robot

Before any thing I am beginner in Arduino field , I am working on mobile robot (Rover 5) with 2 motors , 2 encoders . the controller that designed to the robot needs to know the odometry of mobile ...
48 views

### How to make automated toys? [closed]

I'm not sure this is the right place to ask this question, but I have joined this page as my search was ended with "Robotics" subject. I asked google the meaning of this word and it said, ...
22 views

### Velocity derivatives using Quaternions

I am interested in the velocity derivatives of Quaternions. I am new to this area. I have studied the algebra of Quaternions but unable to understand how to compute velocity derivatives.
42 views

### Can we use this line sensor as a proximity sensor?

Basically, i have this sensor (link to the model given below). It is designed to distinguish black and white lines. It detects white surface and gives me digital 1 as output and 0 in case of black. ...
32 views

### Yaw angle calculation for drone PID from two distance sensors

I'm building a control system with a Parrot AR 2.0 drone where I have access to thrust controls for up/down (z), left/right (y), forward/backwards (x), turn left and turn right (yaw) through a Ruby ...
33 views

### 12V Arduino Dual Bridge to supply at least 5A [closed]

I am looking for a 12V Dual Motor Controller that can supply at least 5A per channel for two 12V motors, and that can be used with an arduino. Do you know of any product with those specs? Thanks
36 views

### 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 ...