0
votes
0answers
13 views

Probabilistic Velocity Obstacles

I have been working with the Velocity Obstacles concept. Recently, I came across a probabilistic extension of this and couldn't understand the inner workings. Source: Recursive Probabilistic ...
0
votes
0answers
13 views

Scan Matching finds right rotation but false translation

I'm currently developing a SLAM software on a robot, and I tried the Scan Matching algorithm to solve the odometry problem. I read this article : Metric-Based Iterative Closest Point Scan Matching ...
0
votes
1answer
7 views

gazebo import robot gives error

I'm trying to import the tutorial robot given at this link However this gives the following error: ...
1
vote
1answer
29 views

Power switch and common ground on a battle robot

I am constructing a 5.44Kg Hobby-weight battle robot and one of the safety rules is that the robot must have a power switch that turns off power to the motors (and weapon). The robot has three ...
1
vote
1answer
25 views

Image processing in bright lights

We are working on a project which requires us to detect and hit a ball. We are trying to accomplish the task by detecting the position of ball by processing the input from a camera. The problem is ...
1
vote
0answers
33 views

tracking robot in a room

I'm trying to track a simple robot (e.g. arduino, raspberry pi, even toys) in a room using fixed location kinect sensor(s) and cameras at different parts of the room. How might one usually use to do ...
2
votes
2answers
52 views

how to power extra usb devices for beaglebone black

I'm building a robot that uses a beaglebone black, however I have several different usb devices that I want to connect to it (microphone, usb sound device and some other things). Now I have heard that ...
0
votes
1answer
21 views

Which is more useful? Instantaneous rate of change of displacement or Average rate of change of displacement?

Instantaneous rate of change of displacement is given by, v(t) = (s(t + dt) - s(t))/dt, where dt tends to 0 while average rate of change of displacement is given ...
1
vote
1answer
44 views

Learning Materials for Beginners in Robotics and Quadrocopters

I am a web developer. I am fascinated by Quadrocopters and i am trying to learn how to build one and basically i am trying to jump into robotics fields. I don't have much electric circuit and ...
0
votes
1answer
18 views

Sending a smartphone's GPS wireless

I'm building camera device which is able to take pictures of paragliders in mid air. To let the camera know where the glider is I thought about using GPS data from the pilot's smartphone. My ...
1
vote
1answer
29 views

How to find the height of a rock with a rover?

So, I am designing a rover that will navigate to a rock, and then calculate the height of the rock. Currently, my team's design involves using an ultrasonic rangefinder and lots of math. I was ...
2
votes
0answers
12 views

Parameter $r$ of Denavit-Hartenberg

By watching this video which explains how to calculate the classic Denavit–Hartenberg parameters of a kinematic chain, I was left with the impression that the parameter $r_i$ (or $a_i$) will always be ...
3
votes
1answer
71 views

Build a ROS robot with SLAM without laser

I've build a simple wheeled robot based on two continuous servos, controlled by Raspberry Pi running ROS-groovy, with a smart phone mounted on top to provide additional sensors. I'd like to situate ...
1
vote
0answers
41 views

PID Control Tuning

Im currently designing a robot for my undergraduate project. One of the task of this robot is to follow the wall. For the purpose I'm using a PID control system, where the reference is given from a ...
1
vote
0answers
18 views

Survey for Local Navigation

I was wondering if there was a good book or paper that surveys current techniques in local navigation? The earliest one I could find was from 2005 and I was hoping to find something more recent. I ...
1
vote
1answer
16 views

How do I get this transformation matrix?

I've just started taking a robotics course and I am having a little problem. I need to rotate the $O_i-1$ coordinate system into a position, where $X_i-1$ will be parallel with $X_i$. The ...
0
votes
0answers
9 views

Numerical-Example for Paden-Kahan subproblems?

I am writing a kinematics library in Go as part of my final year project. I am working with Product of Exponentials method and have successfully implemented the Forward Kinematics part of this. I need ...
0
votes
1answer
25 views

Tilt-Compensated Compass Problem MPU9150

I am implementing a tilt-compensated eCompass, using MPU9150's accelerometer and magnetometer. My steps: Reading magnetometer's data. Hard-iron compensation. Normalize data after Hard-iron ...
0
votes
1answer
11 views

Wheeled Robot Motion Primitives: Is throttling forward and crab motion considered as one?

I am simulating a wheeled robot of six-wheels and can be independently steered, like MER-Opportunity. The wheeled robot can perform throttling forward, ...
1
vote
2answers
29 views

Can I make an automatically-parking robot car with IR sensor?

It would be easy to understand if you imagine a robotic vacuum cleaner. (For some models) It goes back to a specific place automatically to recharge. Like this, I want to make a robot which ...
0
votes
1answer
19 views

ros node does not seem to do anything

I have the following code for the ros turtlesim: ...
1
vote
1answer
9 views

Recursive Tree Representation for Multi Agent Robots?

I have been going through a code base for multi agent motion planning. And I came across a recursive tree building algorithm for the agents. I haven't been able to figure out the algorithm. Does ...
0
votes
1answer
23 views

biped walking using Genetic Algorithm

I am working on a project but I lack advanced programming knowledge, especially about genetic algorithms. I am developing a prototype using WEBOTS 7.4.3 for the simulation. The project is to use ...
1
vote
0answers
9 views

Hokuyo URG-04LX-UG01 and Mac compatibility issues

I've got my hands on this laser range scanner but seem to have some problem receiving any output from it. I can't find that guide on setting it up on the internet, so was wondering if it even is ...
4
votes
0answers
13 views

Brush-less motor specs vs efficiency for multi-copters

I am looking for some figures surrounding the specs of brushless motors and their relative efficiency (in power usage terms) for multi-copter use. There are 4 basic specs for motors themselves: - ...
1
vote
1answer
32 views

How to convert PID outputs to appropriate motor speeds for a quad copter

I am building an autonomous robot using PID control algorithm. So, far I have implemented PID using online resources/references. I am testing for stabilizing an axis of the quad copter. However, I am ...
0
votes
0answers
24 views

Motor recommendation for spinning disk weapon

Any suggestions for an inexpensive but effective motor for a spinning disk weapon (vertical spin) for a hobby-weight (5.44Kg) battle robot please? I have no experience at all with brush-less motors ...
2
votes
1answer
30 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 ...
1
vote
1answer
25 views

Motor for weapon for Hobbyweight

I am currently building a hobby-weight (5.44kg) robot. The weapon will be a vertical spinning disk at the front. It will probably be a commercial one from the hardware store or I could maybe get one ...
0
votes
0answers
18 views

control a robot with pymorse on MORSE simulator question

I am new to Morse and robotics. This code control the robot by giving the linear and angular velocity. This is the scene description ...
1
vote
2answers
66 views

Rotate (and stop) a large disk in very tiny increments

In a lab build I'm doing, I'm stuck at this problem, so I am fishing for suggestions. I'm creating a turn-table type setup where I need to make readings (with a nanotube-tip probe I've already ...
1
vote
1answer
28 views

Spinning disk Weapon

I am building a Hobby-weight robot and my weapon of choice is a spinning disk at the front. As regards the disk I was thinking of buying commercial (grinder-type) disks and change type of disk ...
2
votes
1answer
31 views

Diode or capacitor across terminals of brushed motor

I am currently building a hobby-weight robot (5.44kg) and will be using 2 x 14.4v cordless drill brushed motors to drive my wheels. I have read somewhere that due to "induced currents" when I turn ...
0
votes
1answer
20 views

Amperage on brushed motors

I am currently building a hobby-weight (5.44kg) robot and will be using 2 x 14.4 cordless driller motors for my wheels. The thing is I keep reading about high amperages when working with r/c models ...
2
votes
2answers
72 views

Self Powered Quadcoptor

I have this idea or a very curious question in my mind. I am no where near professional though, but i would like it to be answered. We all know how wind turbines can be used to generate electricity. ...
1
vote
0answers
39 views

Advice on mounting a servo for a nerf sentry gun

I am trying to make a nerf sentry gun to shoot my co workers. I am building it more or less from scratch and have come to the part where I need to come up with plans to assemble it. I am looking for ...
2
votes
1answer
42 views

A general question about PID Controller

I have a basic question because I'm trying to understand right now a concept that I thought it was obvious. Looking at this video he is going to feedback the variable state x with the input of the ...
-1
votes
0answers
21 views

Brushless DC motor -driver circuit

How to run my Brushless DC (BLDC) motors? Apart from using ESCs, how can I control my motors? I need a perfect motor driver and so can anyone send me the circuit diagram?
1
vote
1answer
42 views

Robot docking for self-recharging

I want to build a simple obstacle avoider robot, but this time I want it to be self-recharging so I am building a dock for this purpose, so I want it to be able to locate the dock and go for it when ...
0
votes
0answers
16 views

Interface multiple I2C slaves to microcontroller

I want to communicate the Tiva C ARM Cortex M4 to sensorhub from TI which has multiple sensors with different I2C addresses such as MPU9150, BMP180, Temperature Sensors... With a single I2C slave, i ...
0
votes
0answers
14 views

Making wireless video transceiver with Raspberry pi

I'm trying to make video transmitter using raspberry pi. I'm trying to send data using 433MHz communication, (CC1101 transceiver) And this can be connected to raspberry pi using SPI connection. I ...
-1
votes
0answers
25 views

Microcontroller programmer

Can anybody tell me how to start with microcontroller programming by designing my own on chip flash progrmmaer, starts with an 8 bit controller.
1
vote
2answers
58 views

is it possible to track movement on a tennis court?

I'd like to track my run in an indoor tennis court. GPS won't be available so I was thinking researching for other solutions: Accelerometer: I concluded it's a no go because while playing tennis the ...
0
votes
2answers
29 views

Short distance ball transport

I'm looking for a way to transport balls (diameter 50mm) 220 mm up with over a slope with a length of 120 mm. Currently I'm considering the usage of a belt system but I cannot seem to find a good belt ...
0
votes
0answers
19 views

Acceleration formula for a differential steering robot

I have the formulas to derive the RPM's of each wheel from the robot's linear velocity. Now, I am trying to do the same thing for the acceleration (mainly angular acceleration). For linear ...
0
votes
0answers
15 views

tricopter simulation to test control algorithms

I am looking to write and test my own control algorithms for tricopter flight. I am looking for a simulator that can simulate a tricopter but at the level of receiving simulated PWM and returning ...
2
votes
2answers
59 views

Is there an advantage to multiple magnetometers for heading computation

I'm building an autonomous sail boat (ripped out the guts of an RC sail boat and replaced with my own mainboard etc.) The controller board I have can accommodate both an MPU9150 and an HMC5883. Is ...
1
vote
0answers
41 views

MPU9150 - Yaw angle Drift

I use MPU9150, also use DCM and Complimentary filter to compute roll, pitch and yaw. However, my Yaw is not so smooth. How can I solve that problem? I looked at the datasheet of MPU9150, but I didn't ...
0
votes
2answers
43 views

How to estimate yaw angle from tri-axis accelerometer and gyroscope

I would like to estimate the yaw angle from accelerometer and gyroscope data. For roll and pitch estimate I've used the following trigonometric equations: ...
0
votes
1answer
66 views

Position Controller for a Quadrotor

I have a question regarding the implementation of a quadrotor's position controller. In my Matlab model the quadrotor takes 4 inputs: a desired altitude ($Z_{des}$) and desired attitude ...

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