All Questions

1
vote
0answers
5 views

Programming a G-Code Interpreter

I want programme my very own G-Code generator for my final year electrical engineering project. I know that there are many open source G-Code generators out there, but I need a gcode generator which ...
0
votes
0answers
12 views

Arduino Lightsensor Blocking Code

I have a GY-31 Light sensor and I am trying to make a skittle sorting machine. There is a little wheel skittles can drop into then they are turn to 90 degrees read by the light sensor then dropped out ...
0
votes
0answers
11 views

What middle-ware do you recommend for a swarm of AUVs?

Working with a swarm of robots, collaboration between the nodes is really important(either for the goal of simulation or real-word operation). Middle-wares are the frameworks for this special purpose. ...
1
vote
1answer
24 views

Choosing suitable simulator for a swarm of AUVs

Which of the following simulators is the best choice for simulating a swarm of AUVs working together to perform a mission? Please clarify your reason and if you know any better choice, I would greatly ...
0
votes
1answer
24 views

Roll, Pitch Calculation Problem!

My problem is that when i hold my sensors (MPU9150) so that +y axis is downward, and y axis is on the horizontal plane, i expect that pitch = 90 degree, and roll = 0 degree, but actually pitch = 90 ...
2
votes
2answers
27 views

What happens when a brush-less motor stalls?

Ok apologies for those who think my questions are not direct enough as I got warned about this. I am really new to this and I will try to keep this one direct enough for the forum. For obvious ...
0
votes
1answer
14 views

Wheels for a robot having 15-20 kg weight

What type of wheel material is preferable on wooden floor....I am using nylon wheels but they don't seem to have enough friction and grip.
1
vote
1answer
33 views

Real time operating system for robotics vision

I have robot vision system which consists of conveyor with encoder, two cameras (gigabit eth and usb) and simple illuminator. I need to trigger cameras and illuminator when encoder reaches position ...
2
votes
2answers
23 views

Continous rotation with cables

A motor needs to spin n*365 degrees. On top of the motor there are distance sensor which scan the room. I.e. lidar. What options do I have for implementing a continous rotation while having cables ...
1
vote
1answer
17 views

Is a simple range sensor described below sufficient to implement particle filter localization?

I am trying to implement a monte carlo localization/particle filter localization with a simple range sensor. The range sensor only sees in the direction the robot is heading and returns back any ...
3
votes
2answers
36 views

Controlling a 400W motor with 24V 16A batteries with an arduino board

Can I control a 400W motor with 24V 16A batteries with an Arduino board and a mosfet? What type of mosfet would I use?
2
votes
1answer
25 views

Understanding a sliding mode controller for quadrotors

I'm really willing to understand and implement such a controller (sliding mode) for a quadrotor. I've found this interesting document explaining that topic. If you scroll down until page 381 (don't be ...
0
votes
0answers
19 views

How to change the orientation of an object w.r.t a scene?

I am trying to localize an object in a point cloud using ROS, PCL. For that I capture the scene and model using Asus xtion pro sensor. I use RGBDSLAMv2 for capturing the model. Then I use ICP ...
1
vote
1answer
18 views

A robotics computer with graphics card, lots of computation power, battery, no screen, no keyboard? [on hold]

I'm working on a robotics platform and we need an on-board Ubuntu machine to run ROS image recognition. Does anyone know of a good set of computer hardware that has NO screen NO keyboard Built-in ...
1
vote
3answers
54 views

How to control PID Yaw

My yaw angle varies from -180 degree to 180 degree. ...
0
votes
1answer
17 views

Computational geometry or pattern recognition for a specialization in robotics? [on hold]

My background: I am currently doing MS in computer science, I am planning to do Ph.D. in Robotics, I have decided thesis track for my M.S., so it will help for my Ph.D. admission. My question: I have ...
1
vote
0answers
11 views

How does the “rated torque” for a gear relate to the maximum torque?

I have just sized the DC motors I want to use (corresponding to my robot and its intended applications - my figures include a 50% uncertainty factor to account for friction in reducers and other ...
1
vote
1answer
27 views

Selecting a gear reduction: torque vs speed

I have just sized the DC motors I want to use (corresponding to my robot and its intended applications - my figures include a 50% uncertainty factor to account for friction in reducers and other ...
1
vote
0answers
11 views

Stated power for a motor does not equal nominal voltage x current?

I have just sized the DC motors I want to use (corresponding to my robot and its intended applications - my figures include a 50% uncertainty factor to account for friction in reducers and other ...
2
votes
1answer
26 views

Choosing DC motor: max needed torque vs nominal torque

I have just sized the DC motors I want to use (corresponding to my robot and its intended applications - my figures include a 50% uncertainty factor to account for friction in reducers and other ...
1
vote
1answer
27 views

Is the nominal voltage of a motor the voltage to apply to the motor?

I have just sized the DC motors I want to use (corresponding to my robot and its intended applications - my figures include a 50% uncertainty factor to account for friction in reducers and other ...
1
vote
1answer
36 views

NAO motor model identification

I am trying to create a model for the NAO [robot]'s motors. The figure below shows the step response for the knee motor. Afaik the NAO internally uses a pid controller to control the motor. I have no ...
0
votes
0answers
18 views

Implementing a position control for UAV through a flight controller. Plant model is unknown

We are using Naza-M-Lite for our flight controller without GPS. The localization is obtained through our RGB-D camera sensor. We are able to teleoperate and even implement PID controllers for Roll, ...
0
votes
0answers
33 views

Choosing motor characteristics [duplicate]

I have just sized the DC motors I want to use (corresponding to my robot and its intended applications - my figures include a 50% uncertainty factor to account for friction in reducers and other ...
1
vote
1answer
14 views

Using i2c's SCL and GPIO pins as SDA

The beaglebone black which I work on has only 2 i2c busses. Say for some crazy reason, i need to use 8 i2c busses. I dont want to chain any of the devices. The idea is to have every device's SDA line ...
1
vote
1answer
27 views

Is the input of ESC really limited at 50 Hz and will the PID controllers work properly?

Based on the wiki page of ESC, the ESC generally accepts a nominal 50 Hz PWM servo input signal whose pulse width varies from 1 ms to 2 ms http://en.wikipedia.org/wiki/Electronic_speed_control For ...
0
votes
0answers
33 views

AHRS Algorithm Question

As far as i understand, AHRS use orientation reference vectors to detect orientation error. And we can use magnetometer to correct yaw drift. But i see from my ak895 magnetometer that the data is not ...
0
votes
0answers
13 views

Comparing cordless driller motors with Dremel-type motors [on hold]

How is it that the small drillers (such as the Dremel and similar) can achieve such high rpm and torque from such a small motor when compared to a cordless drill motor? I know one difference is that ...
-1
votes
1answer
20 views

RPM of cordless driller motors [on hold]

What are the typical speeds in rpm of a 7.2v, 12v, 14v and 18v cordless driller motors with and without the gearbox attached? Is it torque or maximum rpm that varies as the voltage increases from ...
0
votes
0answers
32 views

RNN instead of a PID controller

I am building a drone using the raspberry pi and I am using 6*PID controllers to control the speed and the value for each angle, can I use a recurrent neural network (RNN) or other neural network to ...
0
votes
1answer
19 views

Risk of overloading motor controller

I bought 2 brushed motor controllers from China for my hobby-weight battle robot (http://www.banggood.com/ESC-Brushed-Speed-Controller-For-RC-Car-Truck-Boat-320A-7_2V-16V-p-915276.html). These are ...
1
vote
2answers
20 views

Changing tank drive (differential) mode to single joystick drive mode

I bought 2 brushed motor controllers from China to use within my hobby-weight battle robot (http://www.banggood.com/ESC-Brushed-Speed-Controller-For-RC-Car-Truck-Boat-320A-7_2V-16V-p-915276.html). ...
0
votes
1answer
10 views

Motor controller calibration

I bought 2 brushed motor controllers from China to use with my hobby-weight battle robot (http://www.banggood.com/ESC-Brushed-Speed-Controller-For-RC-Car-Truck-Boat-320A-7_2V-16V-p-915276.html). ...
2
votes
2answers
52 views

Proportional controller error doesn't approach zero

I'm reading this pdf. The dynamic equation of one arm is provided which is $$ l \ddot{\theta} + d \dot{\theta} + mgL sin(\theta) = \tau $$ where $\theta$ : joint variable. $\tau$ : joint torque ...
0
votes
0answers
24 views

arduino connect to laptop over rosserial gives errno111

I'm building a robot and it's currently in it's early stages, currently I'm setting up ultrasonic sensors and it worked fine yesterday but today when I run the ...
1
vote
0answers
23 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 ...
1
vote
0answers
20 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
11 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
2answers
62 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
2answers
46 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
1answer
69 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 ...
3
votes
2answers
78 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
24 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
55 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
20 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
34 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
1answer
24 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
90 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
46 views

PID Control Tuning [duplicate]

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
24 views

Survey for Local Navigation [closed]

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 ...

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