# All Questions

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### what's like about GMIS(A new robot OS)？

The GMIS from a new article posted in codeproject.com, here is the link: http://www.codeproject.com/Articles/897132/GMIS-Turn-All-Your-Devices-into-Robots, do you think that it realy is the ...
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### how the strategy changes in a robcup competition without connection to outside?

how the new strategy during a robocup competition is sent to the players of a team while in standard size for example, there is no connection with outside?
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### How can I communicate wirelessly between a RasPi and servo?

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 ...
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### What is the technology used for no-resistance robot arms?

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 ...
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### create2 angle (packet ID 20)

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 ...
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### How to approach an object

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 ...
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### How to control Brushless Motor+ESC with BeagleBone?

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.
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### Locating Omni-Directional Robot

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 ...
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### How to select the parameters of the Sliding Mode Control of a Robotic Arm?

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 gain matrix $\Lambda$ components (and may be) The boundary layer ...
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### Questions regarding 3D scanning and camera choice

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 ...
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### Depth of view for a hypercatadioptric camera

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 ...
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### How to tune the two PIDs for quadrotor

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 ...
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### How to get the projection matrix from odometry/tf data?

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: ...
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### ROVER 5 with 2 encoders help

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 ...
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### Irobot creae 2 C# connection

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 ...
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### Simple way of 3d perception

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 ...
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### What main factors/features explain the high price of most industrial computer vision hardware?

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 ...
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### algorithm Simple Stereo Vision

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 ...
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### How to decide between LiPo or LiFePo for robot battery

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 ...
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### Euler’s Method Or ode45 for solving ODE for control systems

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 ...
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### Easiest way to submit a longer non standard character string via MAVLink

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 ...
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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 ...
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### My PID Controller in Java is not operating correctly

I was looking for an implementation of a PID controller in Java and I found this one: ...
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### Detect polyethylene

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. ...
28 views

### Calculating thrust generated from electric engines

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 ...
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### Enable Bluetooth Adapter for BeagleBone Black

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 ...
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### Mapping algorithm without noise

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 ...
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### EKF over-correcting?

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. ...
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### Beaglebone not accessible through LAN?

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 ...
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### Question about dynamic window approach?

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!
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### Shallow underwater wireless sensor network

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 ...
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### Can't connect to VNC server on BeagleBone?

I have followed this tutorial to setup VNC on my BeagleBone. The problem is on Step 4, it says the connection is refused by host, how can I make it work?
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### object based indoor scene classification

I have to implement indoor scene classification based on objects. Whch segmentation method will be easy to implement and further where can i find simple code for object recognition. I want to make ...
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I designed a mini quadcopter which is about 4.5x4.5cm(Main Body). The main body is the PCB. It weighs about ~20 grams with the battery. I'm using the MPU6050 with the DMP using the i2cDevLib. I am ...
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### using range-only sensors for mapping in SLAM

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 ...
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### how to make a robot move using arduino other than timing to predefined locations?

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 loactions on a board..want to know the ...
55 views

### How to calculate Euler Angles from gyroscope output?

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 ...
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### Using a Bitmap maze image to navigate the maze

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 ...
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### Square with hinge on all four sides

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 ...
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### Help to dimension the right controller for the following Tranfer Function

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 ...
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### Dynamically detect changing obstacles

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' ...
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### How to set up binocular cameras on a car?

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 ...
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### How to tune PID controller for nonlinear feedback linearization control of a robotic arm?

I doing multi-variable PID control of four links robotic arm via feedback linearization, by break the problem into inner and outer loops and so on. I used manual tuning for the PIDs' parameters, and ...
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### joint positions of a robot

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?
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### Glasses with eye sensors

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 ...
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i am trying to read the x,y,z g values using the following code using an arduino UNO but its not working ...
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### Simulate IMU (2D gyro and accelerometer) data

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 ...
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### Psudo inertia matrix in RP model

I would like to find the equations of motion of an RP robot according to the Euler Lagrange model. My problem is finding the pseudo inertia matrix Ji . Could anyone please help me in finding the ...
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### How to send commands to create 2 over Bluetooth

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 ...
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### How important are events like “Robocup” to the advancement of Robotics in general?

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 ...

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