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My application is basically about sound source localization and visual servoing. I selected Kinect as the main hardware.
I already know the basic differences between Kinect for Windows and Kinect for Xbox. I cannot access to windows version from my country (no reseller here in Turkey), but the xbox version is there at ... |
Just like a fish finder finds the depth of the water directly beneath it, Im trying to find a sensor that I can purchase for the Arduino that does the same. would like it to check up to 20 ft at least, with high accuracy, +/- 10 or 15 cm. All the threads and info I've been finding are water level sensors not for water ... |
We are working with an holonomic robot equipped with three (120 degree shifted) omnidirectional wheels. The relative movement is estimated by dead reckoning using wheel encoders. To improve this estimation we installed an gyroscope to measure the change in orientation. Furthermore the robot has a 270 degree laser range... |
I have bought a really small proto X quad (it has a joystick which navigates the device) and I am looking for a way to send a signal to this thing from my computer.
So can anyone point me how can I turn on one of the propellers of this quad using my laptop (I have a decent knowledge in python/matlab/C# but hardware is... |
I am surprised by the price range of Lidar applications considering the simplicity of the design. I try to make a simple project that requires lidar for object recognitions etc. I wouldn't like to use Visual Recognition such as OpenCV.
Regardless of that I am trying to understand why Lidar solutions are so expensive y... |
Is there a generic name for the category of robots that move using two opposing wheels or tank-like treads?
|
I have a couple of these DC motors
http://www.pololu.com/product/2202
Which have an extended motor shaft that sticks out the back and is 1mm diameter.
I'm having trouble trying to think of the best way to attach an encoder disk to this shaft.
I thought of getting a custom wheel 3d printed and make the opening 0.9mm so... |
I am new to robotics and planning my first purchase.
I'm looking at the Baby Orangutang B-328. Here is information about the microcontroller: http://www.hobbytronics.co.uk/baby-orangutan-328.
The pin headers come unmounted, so you have to do the soldering yourself. My problem is that I don't know what the pin connectio... |
I'm a complete newbie trying to build a simple robot that dispenses candy (M&M, skittles, etc). However, since I'm not familiar with the field, I'm having a hard time googling because I don't know the correct terms to search for. I'm looking for a piece to build a robotic 'trap door' of sorts that will open for a spe... |
I am studying Informatics and I am interested in doing a Masters in Robotics and I was checking out some unis and their courses and I saw that Robotics contains analysis and a lot of math.
Why is that?
|
Why do FPV Quadcopter Motors (usually the more expensive ones) draw lower amps than regular motors?
And why are they more squat(disk shaped) as opposed to normal motors which are about the same diameter and height?
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All the pro FPV builds and the more expensive quads don't seem to be using plastic props. Any reason for this?
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Is there any way I can simply run a program on the NXT, but not download it? I have all my programs already downloaded, and I am connecting with a USB cable to a MacBook Pro using the NXT-G interface. Is there any way I can just run programs existing on the NXT from the computer, and not download them? It's really i... |
For robotic manipulator like the one on the picture:
are the configuration space and joint space equivalent? I am trying to understand difference between the two...
|
I'm trying to figure out the diameter of tri-blade propellers.
I found a 7x3x4.5 blade, I'm trying to understand the measurements. Is the '7' the length of the blade giving the prop a 10.5" diameter? or is the 7 the total diameter?
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for a project for a robotic lab, i'd like to build an automous quadcopter able to follow a path and land on its own. I'd like to use an onboard android phone to do the image processing and recognition part, so that I avoid to send the video stream to a control station, process it and send back the commands.
As I need t... |
I have a Turnigy ESC and I am controlling it from AVR. Now I need to calibrate it to set the range of the input.
With a servo tester I managed to calibrate it without any problems, more or less by following the user guide, but when I try to do the same procedure from code, the ESC starts beeping in some confused patter... |
I am planning to buy CNC mechanical skeleton without motors, spindle and controller. I will be using the CNC mainly for aluminium milling. Are there any specifications for minimum torque requirement for stepper motors and spindle to perform aluminium milling ?
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Is it possible to make clone of http://www.makerbeam.eu/ of some easy accessible material like:
wood
plywood
OSB
MDF
HDF
others
Using any type of CNC machine to mill some holes and rails in those materials may give sufficient results e.g. to make a prototype of 3D printer of such "beams".
Of course it won't be as rig... |
There is this project I am working on which is using a BeagleBone and we need a JSP container to run on it. I was thinking of Tomcat but wanted to know if Tomcat is suitable for embedded systems.
Is it too resource-heavy? If yes, are there other lighter JSP containers? I know only of Tomcat and Jetty.
|
When I buy some length of timing belt I don't know how to link ends of timing belt into loop.
So far I've found one way to do that (thanks to http://www.lasersaur.com/):
http://www.flickr.com/photos/stfnix/8697962319/in/set-72157624491114826
Any other ideas?
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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,
$$
x' = Rx + t \\
R =
\begin{bmatrix}
cos\theta & -sin\theta \\
sin\theta & cos\theta
\end{bmatrix}
$$
where $t$ is t... |
I am planing to control my RC helicopter with my computer. I have experience of programming in .Net. Could we use .Net to control RC helicopter?
From where can I start this project?
|
I'm building my first quadrocopter, and I'm trying to come up with a parts list that is suitable for a first build.
I will use this to learn how to fly a quadrocopter manually (lots of crashes!), and to do some experiments with running AI for piloting it.
A couple questions about the below list of parts:
Is this a go... |
Someone told me when explaining about a controller module named CollisionDetector that it only checks self-interference and moves accordingly without detecting collision. To me both sounds the same. How are they different?
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I understand this is a broad question but I'm taking the risk to ask anyway. Robotics, from what I can tell so far, is a detailed, diverse, and thorough field. However, if there are better areas of research to invest time into, what would those areas be?
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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 commands to Roomba, but the roomba doesn't respond. I have the TXD of the cable attached to the TXD of the roomba, the RXD on t... |
I'm looking for low-cost depth cameras (less than 1000 USD) with a range of more than 3 meters.
Currently, I have found only SoftKinetic DS-311 that meets these requirements.
Here are some other low-cost cameras that I found, but they have a short range:
pmd[vision] camboard nano
SoftKinetic DS-325
and others with a... |
I'm multimedia developer who is searching for a way to get GPS signal inside buildings/structures. Is amplification a reliable way to fix this GPS signal issue?
Will a "GPS Amplifier" work as perfectly as using GPS outside?
|
I am planning on creating a quad-copter with my Arduino that I have. I have created a few land robots before but no aerial vehicles, so this is all new to me. I was looking on the Internet for different models, and I see that most robots have 4 propellers. I have also seen a few hexacopters (?) and octocopters but that... |
I've really tried to find something online that's suitable but what I'm after is
I've two concentric circular rings, one of which has a diameter about 10mm smaller than the larger .
The rings themselves are in the region of 300mm diameter.
I'm trying to find a way to connect the two together and allow the smaller to 's... |
I would like to write a simple program which processes the depth feed from an Asus xtion depth sensor using OpenNI. The sensor will be fixed like a CCTV camera and count multiple targets moving around.
The processing would involve some simple functions on each frame (background subtraction, level sets, connected compo... |
In my bachelor, I programmed CNC machines. Now, working with an Industrial robot arm, I learn that their programming languages are mostly similar. VAL is a typical example, for instance:
PROGRAM PICKPLACE
1. MOVE P1
2. MOVE P2
3. MOVE P3
4. CLOSEI 0.00
5. MOVE P4
6. MOVE P5
7. OPENI 0.00
8. MOVE P1
.END... |
Can I assume the noise of motion model to be zero? If so, what are the consequences of doing so?
|
So my team made a Vex robot for the toss-up competition, but we need the arm up during the autonomous. The problem is that it's too heavy to stay up on its own. I was going to use encoders to count what angle the arm is at. I was going to use this code, but I'm not sure if there's a better way.
while(MotorEncoder[righ... |
I have to build a line following robot that will be able to detect a selected colored line on the floor and start following it.
How do color sensors do this after detecting the specific colored line?
|
I am working on SLAM for autonomous car like vehicles with 2D lasers and IMU (deriving odometry).
I would like to know how efficient is using the existing SLAM algorithms (for example: gmapping in ROS based on rao blackwellized particle filter).
till now i find MAP are high in volume and speed of vehicle is high and mo... |
What would the equations be for the robot's angular and linear velocity at P and also P2? I think I'm doing it wrong...
WL = left wheels angular velocity
WR = right wheels angular velocity
For P I had for example the linear velocity = (1/3)rWL + (2/3)2rWR
Am I on right track?
|
I know that inverse kinematics ($p \rightarrow q$, p: desired pose of the end-effector, q: joint angles) is not a function because there might be multiple joint angle vectors q that result in the same pose p.
By inverse dynamics control I mean the mapping $(q, \dot{q}, \ddot{q}) \rightarrow u$ (u: required torques. I a... |
I have big problem. I have to solve inverse kinematics for a manipulator with 6-DOF using jacobian method. From what I know to do that I need to have matrix of transformation and Denavit–Hartenberg parameters, which both I have. But I am not a mathematician, and descriptions I find on the web are not even a bit underst... |
I want to begin robotics.So as a beginner what micro-controller would be convenient?Arduino or PIC?what type of robots can be built with arduino or PIC? Should I start from just a line-following vehicle?
|
Can anyone recommend a commercial or solid, reliable DIY solution for scanning cylindrical objects? I've seen a couple of simple hacks for flatbed scanners, but I'm looking for something I could make or buy for a commercial project that work reliably.
Many thanks
|
I would like to know if there is a good source that combines Slam problem with vision. From mathematical perspective, there are numerous resources that handle SLAM ,however, I didn't find a good source that focuses on slam and vision.
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I am working on a Micromouse and it has three sensors. Call it S1,S2 and S3. For now, I have to use S1. The idea is this S1 controls the left motor and S3, the right motor. S2 will detect wall in the front.
Anyways, I am trying to write a code in C for the dsPIC30F4011 MCU which would continuously read Sensor values a... |
Motion is known to be confined in a sphere with radius of about 0.5m, and resolution doesn't have to be very high (5cm is enough). The device will actually be incorporated in a toy designed for kids.
I tried implementing that with an accelerometer but the estimated displacement drifted away 100s of meters per minute.
I... |
I need to specify a fan motor combination and wondered if there are formulas that can work this out? The fan we are using is a crossflow fan:
So I'm assuming the power required to drive it is derived from the number of blades, dimensions of blades (including angle of attack), dimension of barrel/wheel and the speed in... |
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 difficult to skim easily :)
There are many ongoing projects applying analog or digital circuitry design to implement neurosy... |
I have a Raspberry Pi hooked up to a Roomba 560's serial port. While going over the spec, I noticed movement controls weren't as simple as I expected. I can't send bytes larger than 255, but, according to the spec, to go straight I have to send 8000. How does this work?
EDIT: My solution was the following three functio... |
ROS is not real-time OS.
After reading the architecture of ROS, I am unable to realize why is ROS not real-time? What part of the architecture or what design decision is causing that?
|
In most situations, range of motion is limited by the fact that we need to carry power or information past a joint. So, past a certain point there are either cables in the way, or the cables would stretch so much that they would either prevent further movement or break.
However, if we situate the conductors in concentr... |
In my project i'm aiming to control a quadruped robot from my android phone using raspberry pi as a middle device (web server). In order to make sure that the server on RPi working fine i googled and got an app that sends a specific character whenever a button is clicked and the arduino job here is simply to receive it... |
I was wondering what was, in your opinion, the best way to study the different motions of a Rubiks Cube.
I want to be able to recognize what face moved and in what direction.
Would I be able to get the direction and the face with accelerometers/gyro and if yes how many would I need?
If you have ever used a Leapmotion ... |
I'd like to buy a capacitive touch input robot in order to remote access my iPad but I'm having trouble describing a correct kind of robot.
I would like to keep lag down to an additional 60ms so that it is still a high quality interface.
I would like to have a robotic arm equipped with a capacitive pen that moves to ... |
I want to send image over wireless serial communication. I am planning to capture images using either raspberry pi or stm32 mcu using DCMI and then transfer image using wireless serial communication module such as Xbee or 3DR radio which can provide air data rate upto 250Kbps at baud rate of 115200
I would like to know... |
I am working on an EKF and have a question regarding coordinate frame conversion for covariance matrices. Let's say I get some measurement $(x, y, z, roll, pitch, yaw)$ with corresponding 6x6 covariance matrix $C$. This measurement and $C$ are given in some coordinate frame $G_1$. I need to transform the measurement to... |
Aren't all propellers super dangerous? How are these startups like Hex and Pocket Drone selling drones as 'kid-friendly' to consumers? What happens if a kid puts his finger in a propeller's movement space while its flying?
|
I started to follow "Get started with the Wifi Bee" tutorial in Wifi bee v1.0 wiki page.
I am using Xbee USB adapter v2.0,Wifi Bee-RN-XV,mini USB cable as listed in Tools needed.
When i conneted the Xbee USB adapter v2 to my computer via mini USB cable Wifi bee didn't light up (but USB adapter did light up). Then i fo... |
I need to read the location of my device within a 1m radius sphere, with accuracy of 5-10cm.
The device is handheld and wireless, and currently communicates using a Bluetooth v4 chip. I could add an RF transmitter on the moving part and a few stationary receivers at the base.
What components should I look into? What wo... |
I am looking at buying a servo motor for a an application that must be able to lift 4-5 lb at a rotational speed of approximately 1rpm. The servo motor listed here http://www.robotshop.com/ca/en/hitec-hs755mg-servo.html states a stalling torque of 200 oz-in. Is this torque rating at the horn of the servo motor or the t... |
I am making a robot that needs to continuously track the relative position of a human, up to 15 meters away and with at least 300 degrees coverage. Currently I am using a Hitechnic IRSeeker v2 sensor and made a beacon wristband with 6 TV remote IR LEDs. But the maximum distance I can get is around 3 meters.
I ordered s... |
I'm writing a PID to control a toy car that follows a black line on a circuit. I've tuned my PID and it works at high speed for all the circuit except the winding section. For that, the error signal looks like a sine wave, and the toy car steers too much. I would like it to go close to straight, is it possible?
Edit: M... |
I have odometry data $(x, y, angle)$ of a real two-wheeled robot, who received control commands $(forward speed, angular speed)$.
Now I want to code a motion model (in C++ (/ROS)) which should follow the same trajectory, given the same control commands.
Normally, the kinematics should look something like this:
$$
\beg... |
So I have this optical mouse with me, which has a PAN3504DL-TJ optical sensor. It has a USB interface and when I looked up the internet, all I could find was tutorials using A2501 or sensors in those lines and it has pins like SCLK and SDI but I don't have them instead I have D+ and D-. I understand that these are the ... |
Robotics Stackexchange vs. ROS Answer:
What is better and for what purpose?
|
What are valid values for the Denavit-Hartenberg parameters $d$ and $a$ (sometimes called $r$) of the last 3 links of a robot with spherical wrist?
From this reference, "A spherical joint can be represented by three consecutive rotary joints with intersecting rotation axes."
So the retrictions should be:
$L_{n-2}$ ($d$... |
I have been wanting to build larger robots and r/c cars for some time now, but one issue I have had is trying to find larger motors, in the range of electric wheelchair motor size. I found one set on ebay but I am trying to find a more reliable source for these.
To make my question more clear, I am looking for a reliab... |
I have built a r/c car that runs on 2 30AH 12V DC deep cycle batteries. The motors are 24v motors that will each draw around 15A at full power. My motor controller can handle this, as well as reclaiming braking energy.
This is my way of saying that i have a 24v power system. Now my issue is that I want to run a 12v d... |
I'm using the johnny-five library to control an Arduino Uno running StandardFirmata. I have a HC-05 bluetooth module that I want to use to wirelessly control firmata, but have yet to get it working.
I used http://www.instructables.com/id/Modify-The-HC-05-Bluetooth-Module-Defaults-Using-A/ to configure the board for 576... |
Boston Dynamics keeps making great robots, however, I dont see any papers that they publish. Although now I can find papers on people using the ATLAS robot, I can not find an original paper detailing the robot or its mechanics designs. Is there a reference for the robot, should I use youtube videos?
|
What software libraries are there for assisting the general problem of parsing a stream of sensor data?
We use various sensors like LIDARs and GPSINS units that provide messages in proprietary binary formats, and have to write drivers for each one. Even though there's a lot of similar concepts used in each sensor (like... |
I just bought Arduino Uno and HC-06, I hooked up the connections:
5V Bluetooth → 5V Arduino
GND Bluetooth → GND Arduino
TDX Bluetooth → RX →1
RDX bluetooth → TX → 0
Here are the pictures:
My problem is that I cannot seem to search for the Bluetooth connection on my Laptop or on my phone.
Is there something wrong I ... |
I have a robot platform with differential drive which knows it's position and orientation.
Lets say that the space through which the robot moves is known and it has only static obstacles. The task is to move the robot from point A and heading alpha (on which it currently stands) to point B and heading beta on the map.
... |
I am a beginner to robotics and embedded systems. Consequently I have a lot of questions related to the toolchain and how things are going together like how to debug or how to connect a bluetooth module.
I already tried https://electronics.stackexchange.com/ and it did not work out for me.
Any ideas where I can get hel... |
Just wanted to clarify some pretty basic Arduino concept:
If I put this code into an arduino board:
double start, endTime;
long int counter = 0;
void setup()
{
Serial.begin(19200);
start = micros();
}
void loop()
{
endTime = micros();
counter++;
//Point A
if((endTime - start) > 1000000)
{
Serial.pr... |
I am trying to sync motors on a VEX Cortex based robot and have had mixed success using the encoders with position control. I noticed that the motor setup directive
#pragma config(Motor, port2, motorA, tmotorVex393, PIDControl, encoder, encoderPort, I2C_1, 1000)
has a parameter "PIDControl" but I cannot find any docu... |
I found a model for 2-wheeled robots here:
What is a suitable model for two-wheeled robots?
How should I adapt it to a 4-wheeled setting?
|
Since finding data on stalled and in use under load (not free) amp draw for servos seems impossible, I want to build/create my own servo tester.
All I really want to know is how much amps the servo is drawing at idle, at movement under load, and at stalled/full position. I think that should cover all the bases relative... |
I am working on a system which is measuring a force. The specification is to have a 500Hz bandwidth on the measurement.
Now I was trying to explain this 500Hz bandwith to my mom and I could not really explain it easily.
What is the most easy way to explain the term bandwidth of a measurement to someone without control... |
I am a Computer Science final year undergraduate student.Until now,I used to shirk away from robotics as I believed that it is more related to electrical and mechanical aspects.But my interest in robotics grew by seeing some demos and I seriously want to make a robot which involves AI by teaming up with interbranch stu... |
I am completely brand new to quadrocopter building. I am currently about to start building a Quad. I have done a little bit of research and was thinking of buying the following parts:
KK2.1 Hobbyking Flight Controller
Turnigy H.A.L Quadcopter Frame
4 x NTM Prop Drive 35-30 1100kv / 380w
Turnigy 9X 9CH
Turnigy Plush... |
I am using 8 brushless motors for an octocopter. Each motor can be run at maximum 30A. I use 4 batteries in parallel. How high C number is needed?
$$\frac{30*8}{4*2} = 30C$$
When running the motors at 100% load, it will draw 30C from each battery. Can a 25C with max 50C be used, or will it run hot?
Additionaly, how man... |
When researching robots, micro mouses etc I've often come across people taking about generating "speed profiles" and how to calculate them. Also profiles for acceleration , deceleration , turning etc. Also trapezoidal profile?
But I can't seem to find exactly what is meant by this. The how or why also.
So what is a "pr... |
I want to create a two wheel remote controlled robot. I have worked out a lot of the logic with regards to balancing. I have started to read up on motor control and arduino vs beagleboard black vs raspberry pi.
Is the multitasking nature of a full linux OS a problem I need to be concerned with for this application?
I e... |
I want to make a circuit that powers a transistor when a sound above a set threshold is reached. (Trigger a flash for high speed photography.)
How long will the response time be?
|
I am doing SLAM with a four wheeled (2-wheel drive) differential drive robot driving through some hall way. The hallway is not flat everywhere. And the robot turns by spinning in place, then traveling in the resulting direction. The SLAM algorithm does not need to run online.
The robot takes measurements from a strap d... |
Most small quadcopters use rigid rotors with some fixed pitch.
In principle, I can imagine it might be possible for such a rigid-prop quadcopter to hover upside-down,
but that apparently requires reversing the direction of rotation of all 4 motors.
(This is very different from the way some "standard" single-rotor model... |
Can anyone help me out here with this DC motor, especially the encoder part? I tried searching around for its datasheet but its as short as 1 page and the only spec I get are:
Encoder:
1 pulse/revolution
It has 2 connection on the bottom, and I guess they are for driving the motor, but they say nothing about the 3 conn... |
I'm a newbie to Mircroprocessors (PcDuino, for example) and I wanted to know if Kinect can be integrated with the pcduino, before I go and buy the board. I know in terms of connectors etc what might be required. My concern is regarding the hardware required to run the Kinect.
To elaborate more, I'll explain my current ... |
I'm planning to order parts for my first quadcopter build and I had a few questions. Here is my parts list. I'm crossing my fingers that they are all compatible, and I'm pretty sure they are. I have two questions:
Do I need a Power Distribution Board and if so, what does it do?
Where on my flight controller do I attac... |
I have found some load sensors (piezoelectric) that measure relatively small weights (on the order of ~ grams). That's what I need!
However...
Around my robot, there will occasionally be bursts of extremely high pressure. These bursts do not need to be measured... they just wash over.
The pressure appears, to the senso... |
I have a system that I can make a strong kinematic model for, but my sensors send readings at unpredictable times. When I say unpredictable, I am not just saying the order the readings will arrive, I also mean that sensors are able to sleep when they do not see a significant change. When an input arrives for any given ... |
My friend has acquired a (small) wine yard to discover how much work it is tending and harvesting the grapes.
Now we are musing to enlist robotic help. The vine stocks are usually connected by a stiff wire, so some dangling machine might be feasible.
We are looking for references/inspirations for an agricultural roboti... |
I wrote my own quadcopter firmware which is based on some older code. This code shall stabilize the copter to be always in equilibrium. The model is behaving relatively nice. I can control it with my laptop.
However I noticed, that the copter is hovering to the side (if not manually controlled), likely because of wind,... |
What exactly is active compliance control in robotics joint?
Why Is it used ?
How can I write a program to simulate the compliance control in matlab for a single robotic link or single robotic joint ?
I have to develop an algorithm for torque control.
I have to sense the torque and give feedback to BLDC motor which i... |
I'm trying to use the MCBL Controller by Faulhaber to control my motor. I'm trying to program some sort of driver on linux using the serial connection and libserial. But it does not seem to be working for now.
I'm using the usb to RS232 converter like this one:
I'm wondering if it's well supported by libserial. I've ... |
I am doing research of ego-motion estimation and positioning in 6DoF space. And I found that apparently all systems are based on active RGB-D sensors, like Kinect. I understand, that such sensors provide greater accuracy, and requires less computational resources.
But if such systems will be used, for example, for augm... |
I believe that there must be a tool that can measure $oz-in$ of torque. I do not trust what the servo manufacturers state on their site for torque values, so I want to test them for myself.
Can anyone suggest a tool which I can use to do this? I have used fishing scales before, but I need something more sensitive tha... |
I am designing a remote controlled robot which will have a base with three wheels, two of them will be simple wheels at the back of the base and the third will be a ball wheel at the front. It will have a robotic arm which will have a gripper to hold objects up to 1kg. I have designed the arm like this
What I want to... |
I wonder currently how to implement an altitude control for a quadcopter. I have atm just a barometer/GPS and an accelerometer.
Barometer and GPS are relatively straight forward implemented, but not very precise and slow. For the accelerometer readout, I remove the constant 9.81 m/s² acceleration by a low pass filter.... |
I'm trying to calculate the lifting capability of my four quadcopter motors. I tried using eCalc but it doesn't have battery I'm using. Are there any equations to keep in mind for doing these calculations? Here are some relevant details:
Battery: 2200mAh 3S 25~50C LiPo
ESC: 25A
Motor: 1240kV Brushless
Propeller: 8x4
An... |
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