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I'm following this getting started tutorial, connected the board to USB and it's detected as mass storage, got the driver installed (Win 64), and at the third step I wasn't able to connect to BeagleBone webserver at 192.168.7.2, anything I did wrong? Please help.
Here is some troubleshooting info from Getting Started p... |
I plan to use P8.13 and P8.15 of the beaglebone in a i2c bitbang mode.
Do i need to use external pull up resistors in my circuit? or can i use the internal pull up which is available on the beaglebone black itself?
|
I'm looking to build a new (first) quadcopter without the conventional flight controller and radio, with an onboard RPi and applying some newfound knowledge on autonomous control to improve my coding skills.
Although, since I've never actually built a quadcopter, I don't actually have any experience in using brushless ... |
I have a task of developing a simulation of an adaptive robot control system but I don't seem too have anyone to discuss my uncertainties with. I want to keep the simulation as simple as possible as I have a very tight deadline and it's only a one off project that most probably will never be used in my life again.
The... |
I have a 4-DOF robot arm system with 4 revolute joints arranged in an open-chain fashion like below:
Assume that each link’s mass is a point mass located at p_i and each link’s center of mass is at p_i.
What I am trying to do is calculate the center of mass Jacobian matrix of the arm.
I found some related materials o... |
Been working on a robot recently which uses ultrasonic sensors for an integral part of the navigation.
While testing the sensors I noticed a strange behaviour, the sensors seem to frequently stop functioning and bring the entire Arduino Mega I'm working with to a stop. The strange part is that these stops seem to be en... |
I want to build a quad copter. I want to know how do we calculate thrust or lift generated by using a motor, I am not aware about the capacities of motor. So can you explain how to calculate thrust or lift generated by assuming a motor. And what is the maximum payload that a quad copter can lift for a given thrust.
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Im looking for a good source for robotic components like sheel/tracked robot chasis, motors, sensors, communication and mechanics. I thought about using raspberry and arduino as platforms for automation, is that an good idea? Im asking as i dont know yet much about the motors/drives uses for powering robots.
Thanks!
Ul... |
I have an Arduino Mega board and the Adafruit Ultimate GPS Logger + GPS module shield. I have these two connected together using headers and have the entire thing mounted on my drone. Currently, I have a code that I found online and modified slightly to get GPS coordinates in NMEA format and parse them for the informat... |
I'm trying to do graph optimization with G2O, mainly in order to perform loop closure. However finding minimal working examples online is an issue (I've found this project, as well as this one. The second one though has the form of a library, so one cannot really see how the author uses things.)
In contrast to online l... |
I need the specifications for the Create 2. I need it for research purposes. So I think I'm going to need a high computational computer on board.
Please suggest some nice configuration.
|
We bought a new Create2 robot and started using it. But when we issue the dock command the robot moves for a bit and does not go back to the base.
The base is not hidden or obstructed and the create2 is just a couple of feet away. we need help to figure out why it does not see the base.
Just to clarify that even using ... |
my name is dylan we are doing a project on irobot create and we would like to know the specifications graph showing the battery discharges in volt per time and my robot is the irobot ceate 1.
The battery is the roomba advanced power , it's a 14.4V Nickel metal hybride battery pack and she deliver 3000mah.
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I'm trying to implement the tracking problem for this example using PID controller. The dynamic equation is
$$
I \ddot{\theta} + d \dot{\theta} + mgL \sin(\theta) = u
$$
where
$\theta$ : joint variable.
$u$ : joint torque
$m$ : mass.
$L$ : distance between centre mass and joint.
$d$ : viscous friction coefficient... |
I want to measure the real time RPM of the wheels. I think incremental rotary encoder would be good. But i am confused on how to interface it with DC brushless geared motors. From the images i am not quite sure if only one rotary encoder would suffice or do i need any other sensor also with it?
I am doing my project on... |
I want to build a cheap robot programmable in Scratch graphical language, that could be employed during lessons in school. Scratch code is interpreted on a PC, so on the robot there should be only the code that receives specific commands (i.e. drive forward) and transmits sensors' measurements.
I'm looking for a wirel... |
I am trying to work with the create2. In using the "get distance traveled" command (id 142) I am getting back incorrect data. My simple test case logic is
I am working with the Create2_TetheredDrive.py example
and adding this
elif k == 'PLUS' or k == 'MINUS': # Move 200mm forward or backward
# reset distanc... |
I teach a university sophomore level MATLAB programming class for engineers, and I am planning on using the create2 for their final project. There is a nice simulator and MATLAB toolbox for the Create, but the toolbox utilizes some of the commands that no longer exist on the Create 2, thus it doesn't work correctly. An... |
Are there some genaral rules for the robustness between monocular and stereo vision when considering object detection? I am especially interested in the automotive field - considering distance/obstacle/car detection (see video links below).
Someone told me monocular vision is more robust than stereo. I guess this may b... |
I'm writing some Quad Copter software and beginning to implement an altitude hold mode.
To enable me to do this I need to get an accurate reading for vertical velocity. I plan to use a Kalman filter for this but first I need to ensure that I'm getting the correct velocity from each individual sensor.
I have done this ... |
I'm trying to select a brushed DC motor for a project. I tried following the advice on sizing electric motors, mentioned in this question, but a few details were missing, and I'm unsure if I properly followed the procedure.
For my application, I need:
Nm = number of motors = 2
Wd = wheel diameter = 12 cm
Wp = estimate... |
currently im working on a RGB-D SLAM with a Kinect v1 Camera. In the front-end the SLAM estimates the pose with Ransac as an initial guess for the ICP. With the pose estimation i transform the pointcloud to a pointcloud-scene which represents my map.
To smooth the map im trying to implement a graph optimizing algorithm... |
I'm confused about how to compute the error in orientation. All the documents I've read don't explain how to do it.
The error in position is simply the difference between the points.
Let's assume we have the orientation along the effector axis, and we represent the rotation with quaternions. I have two questions:
Is ... |
I'm currently working on my first robotics project using the Initio kit from 4tronix powered by Raspberry Pi. The setup was fairly simple, and I've been testing it out over the last couple of days. All of the sensors work as expected; however, my motor tests are failing. When I input commands to actually move the robot... |
I've recently been learning about SLAM and have been attempting to implement EKF-SLAM in python. I've been using this great article as a guide. Some progress has been made, but I'm still confused by certain stages.
Firstly, does the inverse sensor model have to compute range and bearing, as opposed to cartesian coordin... |
i would like to build quad that uses bigger propellers like 15" . My question is what kind of motor shall i use ? Low or high KV? Do all motors support this kind of propellers ? Will they burn because of it ?I found they say CW and CCW motors does that mean you can't set way they spin ? I'm totally new in this so thank... |
I've recently been learning about SLAM and EKF-SLAM.
I've began my implementation in python, but have had trouble managing the updating of P, especially when it comes to adding new landmarks. Currently there is no 'P' but just a few separate matrices that I have to stitch together when needed.
My implementation can be... |
I've been working through this informative guide on EKF-SLAM but I'm having difficulty understanding the jacobians required for the 'landmark update', on page 35.
What exactly is Jxr and Jz taking as input? Is it taking the the current rotation of the robot, plus the addition of the odometry update? IE, the rotation th... |
Joint θi di ai-1 αi-1
1 θ1-90 -d1 0 180
2 θ2 0 0 -90
3 θ3 0 a2 0
4 θ4-90 0 a3 0
5 θ5 0 0 90
I am confused about the right way to look for my theta1-theta5.
Probably from the offset limit of the angles or calculation from... |
What is the reduced form of this block diagram? I can't see any solution way :(
|
I draw a robotic arm in Solidworks, but I'm not so sure about how to find out the DOF, forward and backward kinematic.
Could anyone help me understand how to work out the kinematic solution of this robot arm?
|
I'm working on the control of a quadcopter and I'd like to understand how come controlling the yaw does not increase the overall thrust. My understanding is that the control is carried out through 2 PIDs per axis (roll, pitch and yaw). The output of the last PID is sent as a PWM signal to correct the rotor speeds of th... |
Are events like Robocup advantageous to the development of robotic advancement?
Or is it merely entertainment which advances robotics by allowing entry level participation which helps maintain interest?
Do the DARPA Grand's provide a better vehicle for advancement? (pun intended)
|
I'm very new to create 2. I want to send commands using Bluetooth. I have already bought the bluetooth USB radio. What other devices do I need to get or how can I set up sending commands over bluetooth. Any help is appreciated.
Thanks.
|
If I have a robot path in 2D space,
i.e. a vector of (x,y) locations, and I need to generate artificial IMU data (simulate them), how would I go about it?
How do I model equations to generate the values given a time frame and positions?
I've come across imusim I'd like to know how to model them and generate using Mat... |
Someone could tell me if there are wearable devices such as glasses, with sensors that can detect eye movement?
In particular, I would need a device like google glass, having a sensor or a camera that is facing the eye, and it can capture the movement, possibly interfaced with a mobile device.
Alternatively, are there ... |
I would likte to find the joints positions using joint angles, link lengths etc.
How can I define the position of the each joint using DH parameters?
|
I am trying to set up my stereo vision system on a car. However, I meet several problems and do not know how to solve them.
How to select the baseline? I want the distance measurement to be far at 30 or 50 meters and near at around 5-10m. Is it possible to choose a baseline that meets my requirement?
I have tried ster... |
So the idea is that there would be one robot acting as overwatch, which would detect all of the obstacles in an area (which are not necessarily static), and then send the data about the obstacles' positions to another robot that would navigate around the obstacles to a goal.
My initial thought was to have the overwatch... |
I have a generic problem to create a controller for the following system:
$$\ddot{x}(t) = a y(t)$$
where $a$ is a constant real value.
The system could be seen as an equivalent of a mass-spring-damper system, where damper and spring are removed. Also $x(t)$ is the $x$ dimension and $y$ is simply the force moving the m... |
I want to make a component that will be a square plate that will behave like it has a motorized hinge on all four sides. That is, it can "open" by pivoting around any one of its four sides. I want it to pivot by up to 45 degrees.
I thought about designing it so that 3 hinges could be detached while one pivots, but I w... |
I'm working on an robot that would be able to navigate through a maze, avoid obstacles and identify some of the objects in it. I have a monochromatic bitmap of the maze, that is supposed to be used in the robot navigation.
I am just a first year electrical engineering student, and so need help on how I can use the bmp... |
I am using a tri-axis accelerometer and tri-axis gyroscope to measure the linear acceleration of a body. I need to get the orientation of the body in euler form in order to rotate the accelerometer readings from the body frame into the earth frame. Please help I'm so stuck
|
How to make a robot move using Arduino other than timing to predefined locations? and without the use of sensors?? I want to make my car move to different locations on a board..want to know the possible options without using sensors and encoders??
And how does cartesian robot work for predefined locations..does it requ... |
SLAM noob here but trying to implement an algorithm that fuses odometry data and mapping based on wifi signal strengths for a 2D robot.
1)
After various readings of different resources,
I came across this - http://www.qucosa.de/fileadmin/data/qucosa/documents/8644/Dissertation_Niko_Suenderhauf.pdf
that explained what s... |
I designed a mini quadcopter which is about 4.5x4.5cm(Main Body). The main body is the PCB.
![enter image description here][1]
It weighs about ~20 grams with the battery. I'm using the MPU6050 with the DMP using the i2cDevLib. I am using raw radians for pitch, roll, and yaw these measures are read from the MPU6050's D... |
I need to make shallow (max 2m) underwater wireless sensor network. Data payload is about 10kB/s. I know that VLF band (~3-30kHz)could be the best solutions for that, but cause of time-to-market I cannot make hardware and software from the ground.
Maybe someone could share own-self experience in this filed. If band 100... |
I have a my mobile robot and plan to use the dynamic window approach to collision avoidance. I have read the paper ,but have one inequality i can't derive it.
could you tell me? thanks!
|
Since the day I bought it I always use ethernet over USB connection, now I need to use RJ45 LAN cable to connect Beaglebone from my laptop, but my laptop can't even detect LAN connection from it, what could go wrong? Do I need straight or crossover cable? Do I need to configure something first on my BeagleBone?
UPDATE... |
I've been implementing an extended kalman filter, following Thrun's Probabilistic Robotics implementation. I believe my correct step may be wrong, as the state appears to be corrected far too much.
Here's a screen capture showing the issue https://youtu.be/gkSpFK27yvg
Note, the bottom status reading is the 'corrected'... |
I have a simulated robot moving in a discretized 2D grid world that (for various simplification and time-restriction reasons) has no noise. The problem is how the robot creates its initial map of the world. Algorithms like SLAM and occupancy grid mapping are based on uncertainty, but in this case there is no uncertaint... |
I recently bought a USB 2.0 Bluetooth Adapter. It claims to have support from Linux kernels of versions 3.4 and higher. I have a BeagleBone Black with Debian GNU/Linux 7 image and kernel 3.8. I am developing on BeagleBone Black by hosting it through USB with ssh.
I have tried both hot plugging and plugging in before b... |
I wanted to calculate the amount of thrust generated from the engines. I am using the blade 180 cfx model.
http://www.bladehelis.com/Products/Default.aspx?ProdID=BLH3450#quickSpecs
After some research I have found a way to calculate the thrust using:
T = ( pi D^2 rho P^2)/2 where P is the Power multiplier and can be ca... |
First of all, I am in high school[to tell you that I am a newbie and lack knowledge]
What I want to achieve for now is a thing that can differentiate between poly bags[polyethylene] and other stuffs. Or a thing that could detect polyethylene.
I have to built a robot and therefore we have only a few method accessible.
A... |
I was looking for an implementation of a PID controller in Java and I found this one:
https://code.google.com/p/frcteam443/source/browse/trunk/2010_Post_Season/Geisebot/src/freelancelibj/PIDController.java?r=17
So, for what I could understand about it I am using it this way:
package lol.feedback;
public class dsfdsf {... |
Quadcopter frames seem to consistently follow the same X design. For example:
I'm curious to know why that is. It certainly seems like the most efficient way to use space but is it the only frame design that would work for quadcopters?
For instance, would a design like this work?
Why or why not?
|
I want to submit my gains for the PID regulator via MAVLink.
Unfortunately, I am not very used to MAVLink and there are several functions which may be used for that purpose (I think). My string is currently JSON formatted and I was directly sending it to the serial port before.
Is there a straight forward way to subm... |
The dominant approach for solving ODE in control systems books is ode45 since the majority of these books use Matlab. I'm not acquainted with how the ode45 works but lately I started reading about Euler's method in this book Numerical Methods for Engineers. If the step size is very small, then the results are satisfact... |
When choosing a battery for a robot, should you use a LiPo or LiFePo?
For LiFePo, the pros:
can deliver higher sustained amps
many are built to be drop-in replacements for lead-acid batteries and can use the same charger
The cons:
enormously expensive (about $1/watt*hour/kg)
lower energy density than LiPo (around 11... |
I'm working in a project implementing a vision system. I'm a student and this is the first time I'm doing something like this, it has been a challenge.
I'm using a controller (Netduino+2, .Net MicroFramework) and a camera (CmuCam5 - Pixy) and for now it's working well. I'm communicating with the robot(Fanuc M430iA) usi... |
I am a student who is currently working on a computer science project that will require soon computer vision and more specifically stereoscopy (for close depth detection). I am now looking for a great camera to do the job and I found several interesting options:
1- A custom built set of two cheap cameras (i.e. webcam);... |
I wonder is there any simple (can be computed in microcontroller level) option which is suitable for 3d object perception (depth, position, pose or coordinate estimation) of flying robots except LIDAR, stereovision, omnidirectional camera, laser scanner or any other machine vision based techniques
|
My department recently purchased Irobot create 2. We want to recreate the code from the Csharp create 2 driving Tether program to use as a base for our intro to computer science course. Currently the code we are using to talk to the Irobot is http://www.robotappstore.com/Knowledge-Base/How-to-program-Roomba-for-NET-dev... |
am 2 weeks old to arduino projects..i had been using timing all this while to control my rover...now, i wanted to shift to using encoders..am facing quite some problems..am using arduino uno and a two amp motor shield..this is code i am trying to use..am using a 8V Li-po battery
http://www.myduino.com/index.php?route=p... |
I would like to compare my results of visual Odometry with the groundtruth provided by the KITTI dataset.
For each frame in the groundthruth, i have a projection matrix.
For example:
1.000000e+00 9.043683e-12 2.326809e-11 1.110223e-16 9.043683e-12 1.000000e+00 2.392370e-10 2.220446e-16 2.326810e-11 2.392370e-10 9.99999... |
I'm trying to implement two PIDs for stabilizing quadrotor for position tracking. The inputs are $x_{d}(t), y_{d}(t), z_{d}(t)$ and $\psi_{d}(t)$. For position tracking, usually the small angle assumption is assumed. This assumption allows for acquiring $\theta_{d}$ and $\phi_{d}$. These are the results
The x-axis po... |
I am trying to determine the depth of view for a hypercatadioptric camera (camera lens system and a hyperbolic mirror) based on 1.
The following illustration seems pretty clear. For an image point $p$, we are looking for a virtual point $p_u$, given the parameters of the optical system.
I have troubles finding the r... |
A few days ago, I just shared my concerns about the price of computer vision hardware on this same exact forum (see What main factors/features explain the high price of most industrial computer vision hardware?) and I think a new but related post is needed. So here we go.
Here are some details to consider regarding the... |
I working on sliding mode control (SMC) of a 4 DoF manipulator, I don't know
how to select the discontinuity gain matrix, $ K$ , the surface constant (the diagonal gain matrix $\Lambda$ components).
|
I have an omni-directional robot, such as a X-Drive or mecanum Drive that I need to track the position of. I can put encoders on the wheels, but that is all I can do in terms of the sensors. I have no external beacons that I can link to. The issue is that I needed to keep track of X-Y position, including strafing, and ... |
I can't really find a real straightforward tutorial for that. There are a lot for Arduino but I only have an original beaglebone, an ESC, and brushless motor with me. Please help.
|
My question is more on a basic/conceptual level.
I'm looking into a way to approach an object in map, that I have detected earlier. My robot is localized in a map using SLAM. And object position is 2D point that I recieve from my algorithm. (Object is actually a face picture on a wall). Is there a smart way to approach... |
how to convert the value you get for the angle (packet ID 20) into degrees?
i am using the create2 robot and when I did not understand the data I am getting back. The documentation it says it's in degrees but what I get back is a huge number like 4864 when I turned the robot just 45 degrees.
|
I saw a high end robot arm once that I could move and bend it to any form I wanted with no resistance, as if the robot arm didn't have any weight. I'd like to know more about them. What is this class of robot arm design called? Where can I get some more information about its design and applications?
|
I want to use a Raspberry Pi to pan a camera mounted on a servo wirelessly from ~100 feet away. What are some good servos and transceivers for this?
To clarify, there should be no physical connection between the RasPi and servo.
Do I need an additional RasPi on the servo end?
|
How is a new team strategy during a robocup competition sent to each player of a robot team? Robots in the Standard Platform League (i.e. SPL), for example, are fully autonomous and there is no connection with non-team members (except pulling from the GameControl).
|
The GMIS (General Machine Intelligence System) from a new article posted at codeproject.com looks interesting. Do you think that it could be a breakthrough in the field of robotics
|
currently i am programming for a robotic simulation. I have a Endeffector which aproaches a target, on the way to the target is an Obstacle. Now i redirect my Endeffector, so that it does not hit the target.
When i want to do the same for the whole arm i want to push the arm away from the Obstacle as well. Now i have i... |
I have 3 ultrasonic Sensor (HC-SR04), i want to use one of them as transmitter, and the other as receiver, i want to let the first one send ultra Sonic waves and the other receive these waves from the same transmitter.
how can i do that ?
i tried to send trigger for each ultrasonic and connect them on different pins o... |
how do you calculate the PID values and stabilise the quadcopter using the on board sensors The gyro accelerometer and magnetometer
|
I was just wondering if it was possible to buy or build a programmable drone with a robotic arm,hand, knife.
I want to program a drone to harvest crops.
-object recognition from live video stream to server
-identify and grab objects with arm, make cut if necessary
-transport produce to collection site
I know this would... |
i am working on my master's thesis about design and construction of universal robotic arm.
Goal of my work is to design 5 DOF robotic arm. Something like on the picture:
I need it to be able to lift a weight about 5kg. It has to move in "action radius" 1m. Rotation speed should be about 1m/s. The conclusion of my wor... |
I know there are lots of consumer depth image sensors: kinect, primesense, structure.io, leap motion, ... But I'm looking for something that is more suitable for integration into robot, something without case or with proper mount, compact and available for at least next five years if robot is going to production. Somet... |
I have a FIRST Robotics spec National Instruments cRIO. I would like to connect a USB wireless Xbox controller to it in order to control it from a distance with minimal extra hardware (which is why I am not using the more traditional WiFi radio method). To this point I have been able to find either
A. A sidecar for t... |
Guys I am making a home automation system very simple one with infrared remote ccontrol of tv remote Now the problem is I wanna buy a some relays to switch 230V AC using my arduino board but can't understand which one to buy I don't want to buy relay module but I wanna buy relay.
|
I have a quadcopter using a MultiWii(Arduino Mega) controller. I am curious if there is any way to connect it with ROS capable RPI. (That I could add to the quad itself).
|
I would like to build a 70cm articulated robotic arm (not a scara one) that can lift between 10kg and 15kg (10kg would be awesome already, this payload includes the weight of the arm+gripper) and moves at 1 m/s (dreaming again :)). The goal is to make it similar to an human arm since I want to control it "remotely", so... |
i want to run two HC-SR04 on one PIC16F877A and send the value mesured by the two ultrasonic to serial port.
this is my code using PIC C Compiler :
#use rs232(baud=9600,parity=N,xmit=PIN_C6,rcv=PIN_C7,bits=8)
#define e1 PIN_B6
#define t1 pin_B7
#define e2 pin_B4
#define t2 pin_B5
int a;
int distanse(int,int);
vo... |
I am implementing a Denavit-Hartenberg forward transform for a 3-axes CNC mill. I know that the kinematic for such a machine is trivial and doesn't need DH, but I need to make appliable for other robots too. My implementation does the math correctly(I've verified that with another tool), but the transformation doesn't ... |
I'm trying to create a function that allows me to more easily start a motor, but I'm running into a problem, I don't know the type to use for the motorName argument. I'm using a VEX 269 Motor. Here's the function.
void runMotor(MotorTypeHere motorName, int speed, int time)
{
startMotor(motorName, speed);
wait(time)... |
I've read the AccelStepper documentation on airspayce.com and it seems to be not possible to accelerate a stepper starting with a speed greater 0. Acceleration always starts from speed=0, I tried it with several variations of the code below...
#include <AccelStepper.h>
int onOffPin = 9;
AccelStepper stepper(AccelStepp... |
I've looked around but can't find the answer, to what I hope is a simple question. I'm working with a TI-SensorTag, and I want to be able measure the rotation around the unit's Z-axis. Basically I want to attach the tag to a clock pendulum, lie the clock on a table so the tag and clock face point up, and to measure the... |
I have been working on trying to get the angle of the Create 2. I am trying to use this angle as a heading, which I will eventually use to control the robot. I will explain my procedure to highlight my problem.
I have the Create tethered to my computer.
I reset the Create by sending Op code [7] using RealTerm.
The ou... |
I'm working on a project to make a SmartBall that can detect the velocity(km/h) , spin(degrees per second) and flightpath(trajectory) of the ball using Intel Edison with the 9DOF block (LSM9DS0 : 3-axis accelerometer, 3-axis gyroscope, and 3-axis magnetometer) & the battery block, I'm reading values from the 9DOF block... |
I was wondering how I could determine a robot's distance from a fixed point when the robot itself is constantly changing positions. I can keep encoders on the wheels and can also get data from a gyroscope and an accelerometer.
|
I'm wondering if there's a feature to "flip" the rotation direction with Dynamixel (I'm using MX-106). For example, if I give +1.57 to the motor, then it interprets it as -1.57. And the other way around.
I'm using its ROS driver package that doesn't seem to explicitly claim that there's a feature to do this, although t... |
I am building a quadcopter using the Arduino Uno with a 6dof accelerometer and gyro. I will be adding a separate 3 axis magnetometer soon for heading. I have successfully implemented the code that reads the data coming in from these sensors and prints them out.
I have also checked for bias by averaging 100 measurement... |
I'm working on my own ROV project, but I find OpenROV have a ready to use image for my BB so want to use that instead of making my own program, and I already deployed the image, but I can't find which three pins find that send PWM signal for ESC's? Please help.
|
I have a PTU system whose transfer function I need to determine. The unit receives a velocity and position, and move towards that position with the given velocity. What kind of test would one perform for determining the transfer function...
I know Matlab provides a method. The problem, though, is that I am bit confused... |
What is the difference between Smoothing and Mapping (SAM) and Simultaneous Localization and Mapping (SLAM)? These general approaches seem closely related. Can someone describe the differences?
|
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