1
vote
1answer
17 views

How to machine aluminium on a low budget?

For my robotic projects I need some aluminium parts. Currently I am looking for a way to build a chassis including simple gear box. So I need relatively high precision. Which options do I have to ...
0
votes
0answers
14 views

RC Helicopter with PC controler

I'am try to make PC controlled RC helicopter. I have simple RC helicopter(4CH), and can I connect its radio transmitter directly to PC(ex. ComPort) without arduino??
1
vote
1answer
16 views

Best technique to built an ejectable drawer?

I want to build a closet with ejectable drawers. On the top should be 4 buttons, each eject opening one of the four drawers of the closet. I am looking for ideas on how to accomplish this. What kind ...
1
vote
0answers
17 views

Is there a rule of thumb for actuator torque overhead?

When installing a servo or other actuator, I measure the force needed to perform whatever action is needed and find an actuator that can generate more than the necessary force. However, I recently ...
1
vote
1answer
67 views

Exoskeleton Drive System Help

I am currently working on an exoskeleton. The exoskeleton is going to help kids with cerebral palsy learn to walk 4 years sooner than traditional therapy. Currently we are using 2 Ame 226-3003 with ...
1
vote
2answers
42 views

Cascading PID DC Motor Position & Velocity Controllers

I'm trying to build a robot with a differential drive powered by two DC Motors. First I implemented a PID Controller to control the velocity of each motor independently. Estimated the TF using the ...
1
vote
0answers
18 views

Compact design - building from off-the-shelf components

I want to build a small cylindrical arm, with a main 360º angular servo on the longitudinal axis, and a secondary angular servo with variable speed in a trasversal axis that rotates with the main ...
3
votes
2answers
60 views

PID Integration over not constant dt (∆time)

Is integration over not constant dt (∆time) a possible thing? Let's say you have a PID loop with differentiating frequency, can the integral part of it still work? (Assuming you know the dt from the ...
1
vote
1answer
57 views

Cheapest centimeter accurate GPS

I am looking for a cheapest possible GPS setup with a centimeter precision without much HW hacking. I am not able to produce my PCB or do any soldering (though I would do that if there is no other ...
0
votes
0answers
17 views

What is the difference between the two different types of Mecanum wheels?

While looking at Mecanum wheels, I noticed that there are two different designs that are popular. One type holds the rollers in between the wheels frame, and the other holds the rollers from the ...
1
vote
1answer
20 views

Stepper does not turn

I always wanted to have a CNC to make PCB quickly at home. Finally, I got a 7x7 kit from zentools recently and put it together. I attached a battery powered screw driver to 2nd shaft of the stepper ...
0
votes
1answer
61 views

autonomous obstacle detecting quadcopter

Is it possible to build a quadcopter which can detect obstacles and thereby avoiding them in order to reach its destination? If so,how could it avoid the obstacles and how can the destination be set
0
votes
0answers
18 views

State Covariance Matrix for Extended Kalman Filter using odometry motion model

Following from this post (link). I kindly like to ask since we are actually using odomotery reading rather than actual measurement manipulated as controls. what will the state covariance matrix be ...
0
votes
0answers
28 views

Arduino with two Linear Actuators, two ACS714 Current Sensors, and an L298N Motor Driver setup

I am using the L298N motor driver to drive two HAD1 linear actuators (12V each and a no-load drive current of ~950mA each) Linear Actuator: ...
0
votes
2answers
66 views

Which micro-controler/processor to be used for autonomous stereo vision robot system?

I am very new two robotics, however I have a working stereo algorithm which I want to combine with a SLAM algorithm. I am developing this system for an other application but I decided integrating it ...
1
vote
1answer
55 views

Calculate object distance with camera

Firstly I'm unsure whether this question belongs here or on another SE site (but I'll wing it for now). I've recently been given the job of connecting up a 'smart camera' to a setup where a robotic ...
1
vote
1answer
14 views

EKF Localization when robot is in parallel with a landmark.

I'm facing a real weird problem with EKF Localization. The filer gives me wrong error every time the robot is in parallel with a landmark. I've debugged the code many times but failed to solve the ...
0
votes
1answer
48 views

I need advice for mobile robot navigation

I have built my robot with two servo-motors (with encoders) and ultrasonic sensors , the mobile robot should navigate from its initial point to goal point without collide with any obstacles dependent ...
1
vote
1answer
38 views

Tilt-compensated compass - at my wits' end

I'm a bit at my wits' end here - I'm trying to build a tilt compensated compass for my autonomous sailboat (ardusailor!). I'm using an InvenSense MPU9150. Originally, I used the built-in fusion ...
2
votes
1answer
62 views

Kalman filter Issue - GPS Odometry Fusion

I am working on estimating a robots pose using Odometry and GPS. My first problem is that all kinematic model i have seen for a differential drive robot proposes using the displacement of the left ...
1
vote
1answer
20 views

sparse matrix in EKF SLAM

I've successfully done with EKF Localization Algorithm with known and unknown correspondences that are stated in "Probabilistic Robotics". The results make perfect sense,so I can estimate the position ...
1
vote
1answer
107 views

What type of mechanism is this?

Held and rotated by the knurled ends, one in each hand, the silver spokes rise and fall in order for the assembly to rotate. What is it, some companies' salesmen show tool? Found in an old building, ...
1
vote
3answers
47 views

What is the difference between screw and wrench in rigid body motion?

A screw is defined by a six dimensional vector of forces and torques. It can represent any spatial movement of a rigid body (as written here). But I don't get the following distinction between screw ...
0
votes
2answers
55 views

PD controller in C#

I am currently building a line-following mobile robot. I've done all my image processing work in C#, and now I am in the control phase. I am looking for a PD controller program written in C# to start ...
1
vote
2answers
65 views

Solenoid to launch a ping pong ball

I've been looking for ideas on how to launch a ping pong ball a small distance (< 1 metre) for a game. Solenoids look like they might be useful but I'm not 100% on what force/type I need. I can ...
1
vote
1answer
22 views

Are stereo camera calibration data standardized?

Is there a standard format of how stereo calibration data (various matrices, usually saved in XML) are stored? Can I load calibration data generated say from a OpenCV script in C to another OpenCV ...
0
votes
3answers
43 views

Determing limits of rotation in a robot workspace

How to determine the limit range of end effector orientation (Roll-Pitch-Yaw) at one specific point(XYZ)?I had derived Forward/Inverse kinematic. I'm making a program for 6DOF articulated robot arm so ...
0
votes
1answer
37 views

Visibility Graph Toolbox for Python

I'm searching for a python toolbox/library to do visibility graph based motion planning. I have searched on the internet, but couldn't find anything. I'm probably missing out... Is there any package, ...
2
votes
1answer
37 views

Stereo camera baseline not needed for calibration?

I am doing stereo camera calibration as described in this blog post. I wonder I do not need to input camera baseline for the calibration. The fact probably goes back to some very basic mathematics of ...
-2
votes
1answer
36 views

PC controlled quadcopter using telemetry

Is it possible to control a quadcopter via a computer, using 3DR radio telemetry to connect them?
0
votes
2answers
26 views

IMU based acceleration parameters for differential drive robot

I have a differential drive robot whose motors are virtually quiet while driving on a completely flat surface, but the motors make a lot of noise when on a incline. This is likely due to the ...
1
vote
0answers
24 views

Software to simulate mechanics of production line

Is there any software where I can simulate production line elements (joints, motors, springs, actuators, movement)? For example I want to simulate mechanism to unwind paper from big roll to weld it ...
0
votes
1answer
32 views

Tilt-compensated motor output to keep altitude for quadcopter

The propellers of a multicopter produce thrust. Unfortunately the thrust is the smaller, the more the copter is tilted. I was currently wondering whether there is an established method to calculate ...
1
vote
1answer
32 views

Good method for Retuning a PID After Detecting Oscillation

Given a PID controller with an anti-windup, what are some practical ways to retune the controller once oscillation has been caused and detected? I have access to the magnitude and period of the ...
0
votes
2answers
37 views

I need a software that will help me track passage and identify fish in clear water

I am in charge of studying passage of different species of fish (six species) between lakes in Patagonian Andean range. We've been thinking of deploying video cameras underwater, but we'd need ...
2
votes
3answers
52 views

Robot interaction language

Is there any well documented robot interaction language? I would imagine something like taking a user's speech in English, parsing it using some natural language processing like NLTK or Stanford NLP ...
1
vote
1answer
40 views

Designing compatible spur gears for a robot gearbox

I'm trying to increase the torque on the output shaft of my robot's gearbox. I have a motor with a pinion attached to it with 8 teeth. I want to create a gear with 33 teeth that will mesh with the ...
0
votes
1answer
46 views

Up to what force is a servo motor a reasonable choice as an actuator?

I'm working on an application where I need to apply a linear or angular force to operate a linkage mechanism, but I don't (yet) know what amount of force I will need. I anticipate that it will be less ...
0
votes
1answer
30 views

Android Vibrating based on Arduino devices

I want to make a simple device that causes my cellphone to vibrate for 30 seconds when my phone is 10 feet away from it. How would I go about doing that. How small could I make the device?
1
vote
6answers
67 views

Finding a Hydraulic Actuator to be controlled through a MCU

I'm researching potential actuators I can use on a project i'm doing. I'm designing a creeper (platform for rolling under vehicles) that can lift you up just like the operation of those hospital beds. ...
2
votes
2answers
47 views

Predicting the impact point of a moving object

Suppose we have a moving object (a horizontal projectile motion as one of the most basic examples). Is there any way to predict where it will hit finally? Please note that I'm looking for a machine ...
0
votes
0answers
6 views

How to match Nao head and torso

There are lots of Nao robots here. But everyone randomly swaps around the heads and torsos for no reason. I want to restore them. Is there any way to know what heads and torsos 'belong to each ...
2
votes
0answers
45 views

Repairing non-lubricated linear actuator

I have a Chinese CNC mill (CNC3020T, though several different devices go under this name), and its Z axis was very imprecise, often being randomly off position by as much as 0.5mm. I've disassembled ...
1
vote
1answer
41 views

Is this gear design feasible?

I came up with an idea and am working with a mechanical engineer to design and prototype the idea but I keep sketching out my own ideas in the process and I just came up with this.. I'm quite sure ...
0
votes
1answer
40 views

Why production lines are so huge and power hungry?

I'm thinking of starting my adventure in area of professional manufacturing. When I started to look onto machines I figured out that they are build somehow like in the 70s: huge footprint, big 3kW ...
1
vote
0answers
16 views

Can active sensor data be fed into an Autodesk Inventor Simulation?

I'd like to drive the position of various components within a virtual assembly based on sensor data being collected in real time from an external device. Does Inventor support such a setup? The goal ...
1
vote
2answers
59 views

Electronic Speed Control Concepts

I am a programmer who has never worked with electronics before. I am learning the concepts and hoping to build a quadcopter, with the control software entirely written by me. Motor control seems to be ...
0
votes
3answers
34 views

Best microphone for speech recognition tasks

I made several tests with different setups in order to achieve an acceptable speech recognition quality. It works well when I push a button to activate it but now I want it to be automatically ...
1
vote
1answer
29 views

Current-limiting stepper motors for RepRap

I have been working on a robot project for a while. Now I am tired of finding parts that just does the job, so it is time to do create parts. A 3D printer will do the trick for many parts, but 3D ...
1
vote
3answers
61 views

Manipulator link applied torque

I want to implement a manipulator link using a phisic library. I can only apply some torque to the center of mass, but, i guess, the torque should be applied at the beginning of the link. Shifting a ...

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