Robotics Stack Exchange
Robotics Stack Exchange

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1500 questions
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How to connect Phone to Robot while charging phone from external battery?

I am controlling a robot via usb from an Android phone running the robot's code. This phone has a poor battery and I need to extend its life with a USB charger (can't change phones). How can I charge an android phone via usb, while maintaining a USB…
UniversalAwareness
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High voltage motor control with arduino

I'm trying to control a higher voltage motor than an arduino can source with a pin, with an arduino. I am trying to hook it up to a transistor. The battery pack is not supposed to be 4.8V, it's 6V, 4 D batteries. Here is the setup: Here is the…
Elias Benevedes
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CC3D - Replacing RC emitter with an RPi

I am trying to control a quadcopter using te OpenPilot CC3D board and a RaspberryPi. The main idea was first replace the signals from the RC emitter to the CC3D RC receiver for an RPi connected directly to the RC receiver inputs of the CC3D. As far…
osuarez
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2 answers

Wheel encoder triggers interrupt too many times

I am building a simple robot with two driving wheel. I want to control the wheel rotation using a wheel encoder like this one. Here is a code I have on Arduino to try to understand the problem I'm facing: int count = 0; void setup() { …
ejalaa12
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Is it possible to achieve arbitrary precision in camera calibration?

Is it possible to achieve arbitrary precision to the calibration of the extrinsic parameters of a camera or is there a minimum error wich can not be compensated (probably dictated by the camera's resolution)?
JLagana
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Arduino Nano + Raspberry Pi = UAV Ground Station?

I'm a programmer by trade, and an amateur aerospace nut, with some degree-level training in both fields. I'm working on a UAV project, and while the good people over at DIY Drones have been very helpful, this question is a little less drone-related…
anaximander
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2 answers

Tracking objects from camera; PID controlling; Parrot AR Drone 2

I am working on a project where I should perform object tracking using the camera of Parrot AR Drone 2.0. So the main idea is, a drone should be able to identify a specified colour and then follow it by keeping some distance. I am using the cvdrone…
fiz
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Calculating required torques for a given trajectory using Lagrange-Euler

I have a 2DOF robot with 2 revolute joints, as shown in the diagram below. I'm trying to calculate (using MATLAB) the torque required to move it but my answers don't match up with what I'm expecting. Denavit-Hartenberg…
robot_overlord
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Forward kinematic and inverse kinematic... When to use what?

I am not quite sure if I quite understand the difference between these two concepts, and why there is a difference between these two concept. Yesterday I was trying to compute the jacobian needed for an inverse kinematics, but the usual input I…
Carlton Banks
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How to Identify Objects in Space

Using a depth sensing camera like Kinect, I would like to retrieve the position of an predetermined object (e.g. a cup, fork etc so that I would ultimately be able to grab the object). What would be a way to achieve this?
Jon
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How to use SLAM with simple sensors

What 2D SLAM implementations (preferably included in ROS) can be used with simple distance sensors like IR or ultrasonic rangefinders? I have a small mobile platform equipped with three forward facing ultrasonic sensors (positioned at 45 degrees,…
Cerin
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Designing a 5 bar linkage robot: Plot Clock

I am a beginner at robotics. I recently stumbled across this robotic clock on youtube. I am an electrical engineering student and am interested in submitting it as my minor project. I have studied the basics on forward and inverse kinematics,…
Piyush Menghani
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Robotic arm ["FAiL"] error display. - Festo / Mitsubishi Melfa RV-2AJ (Controller CR1-571)

To avoid wasting your time on this question, you might only want to react on this if you have knowledge of industrial robotic arms specific. Common troubleshooting is unlikely to fix this problem or could take too much time. We've started a project…
aaa
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Gyro measurement to absolute angles

Let us assume we have a gyro that is perfectly aligned to a global frame ($X,Y,Z$). From what I know the gyro data give me the angular rate with respect to the gyro axis ($x,y,z$). So let's say I got $\omega_x,\omega_y,\omega_z$. Since I know that…
charles
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velocity of the end-effector

The joint velocities are constant and equal to $\dot{\theta}_{2}$ = 1 and $\dot{\theta}_{1}$ = 1. How to Compute the velocity of the end-effector when $\theta_{2} =\pi/2$ and $\theta_{1} = \pi/6$
shr
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