# All Questions

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### Calculating the force of this system

My native language is not English, so I don't know all the specific terms you may expect me to use. I apologize for that. Anyway, I have a motor and three connecting rods (in French, bielles). So ...
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### control circuit of humanoid robot: is it worth to learn and use ROS

i am building the upper body of a humanoid robot for my MSc thesis project with 24 dc motors and multiple sensors(something like i-cub or Nao) i have basic knowledge of communication protocols and ...
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### Connect to video stream with Java app instead of console and mplayer

I'm building quadcopter with Raspberry Pi. There is the Pi Camera connected to Raspberry Pi streaming captured video and I can connect to this stream via wifi on my notebook (linux) by using console ...
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### Trying to design a mechanical system with vertical and horizontal movement

I'm a mining engineer dabbling in things I don't understand. Basically I'm trying to devise a system to lift a 10kg weight a distance of 1.4m vertically, and allow it to move in/out a distance of ...
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### Is the accuracy of estimated position in localization is better than estimated position in SLAM?

We estimate position of robot in localization ans SLAM. My intuition says we get better position estimation in localisation than in SLAM because we have better sensor model likelihoods in localization ...
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### I am new in robotics…I want to know about SLAM algorithm…How should I proceed?

Please give me guidance how should I proceed to know about SLAM algorithm? I am following some youtube videos but those are not so much helpful for me.....
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### remote control laser meter

I am looking to buy a laser distance meter and to connect it to a motor and a 3g cellular to control both the motor and to mesure the distance. I will appriciate your advice on how to do so. thanks
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### control circuit of a humanoid robot (something like i-cub or Asimo)

My friend and I are building the upper body of a humanoid robot for our MSc thesis project. There are 24 dc motors in this robot the thing I want to know is what is the best way to command these ...
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### Linear State space model for mobile robot

How can I write a linear state space model for a 4 wheel mobile robot with Ackerman steering in terms of error. I want the robot to follow a line. The robot is rear wheel drive
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### Turning position level FK to motion level FK

I have a position level forward and inverse kinematics blocks that I built on simulink by using s-function. I need to obtain the motion level FK and IK as well. FK input is two motor angles and ...
18 views

### How does power get to the flywheel in a motorized gyroscope?

When I look at my toy gyroscope (I have never seen the inside of a motorized gyroscope), the central flywheel is suspended within the various gymbals and needs a lot of freedom of movement. It's hard ...
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### Good 3D simulator for outdoor autonomous navigation

What's an appropriate tool for simulating a car driving in a simple closed-loop racetrack? I'm trying to implement the control logic for an autonomous vehicle, and I'd like to be able to first ...
20 views

### Nano Quadcopters Microcontroller and battery

I am looking into building a nano quadcopter, But as i watch more resources and videos i get more confused, regarding some of the things that i hope would be answered here. I am in very basic level of ...
23 views

### Best UGV platform?

My lab is interested in a good all-terrain UGV that can also be used indoors. We are particularly interested in the Clearpath Husky, Clearpath Jackal, and the Robotnik Summit XL (or XL HL), though we ...
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### Seamless motor movement

With the lego NXT Mindstorm kit I would like to have a rotating carousel that has "perfect" movement. This carousel has baskets and therefore it has quite a bit of inertia. I would like to find a ...
32 views

### Open source implementations of EKF for 6D pose esimation

I am looking for open source implementations of an EKF for 6D pose estimation (Inertial Navigation System) using at minimum an IMU (accelerometer, gyroscope) + absolute position (or pose) sensor. ...
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### How do I determine the heading of a six wheeled robot?

I have a robot simulation that simulates Mars Exploration Rover with six steerable wheels. In case of the following steering configuration ...
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### Backstepping Integrator: changing the virtual control

given the following differential equation 2°ODE in the following form: $\ddot{z}=-g + ( cos(\phi) cos(\theta))U_{1}/m$ found in many papers (example) and describing the dynamic model of a quadrotor ...
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### DualCopter Degree Of Freedom

I am a newbie in this drone field. I am curious to know what type of rotation and translation a dualcopter can achieve ? By rotation and translation i mean can it be able to roll, pitch and yaw like ...
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### How many work injuries occured by a human robots interaction last year?

Does someone know a statistic about how many people injured by a robot every year. What is the main cause? The collision of a robotic arm with a human?
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### Could a robot be programmed to be human? [duplicate]

This is all hypothetical. If it was possible, it would have been done by now. I realise that this area has been touched upon in many sci-fi movies but I wondered that if it was even feasible, how ...
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### Can triangulation by measuring angles to 3 beacons to find location work over a large outdoor area

To determine an outdoor location I think that I need to measure the angles between at least 3 beacons and take into account the order I sweep the beacons. Is this a workable solution to get ...
18 views

### Keeping two wheeled wall following robot straight [duplicate]

I have a two-wheeled (two DC motors) robot that needs to follow the wall beside the robot. The issue is that the DC motors spin at different rates (because they are not identical, of course), so the ...
65 views

### Keeping two wheeled wall following robot straight

I have a two-wheeled (two DC motors) robot that needs to follow the wall beside the robot. The issue is that the DC motors spin at different rates (because they are not identical, of course), so the ...
19 views

### How to use gear motor 9 with Arduino

I am new to robotics. I want to make a robot using Arduino Uno R3. I need to use Gear Motor 9 for that here is the link. The problem is that motor needs 50mA current. But arduino only outputs only ...
38 views

### Stereo vision on a moving vehicle

When I put stereo camera on a moving platform and sync the cameras, what kind of delay between the cameras is tolerable? This would probably depend on the motion, but are there some guidelines? Are ...
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### Connecting multiple servos to a robotic arm

I am computer programmer and it's really been long since I have done electronics. I need help on connecting my servos to an Arduino to power my robotic arm. This is the robotic arm that I am trying to ...
21 views

### How to program an Inovatic USB interface?

In my possession I have an Inovatic USB Interface. (In Detail: UI-8x8 v1.1 2009) I would like to program it to do some simple stuff and things. I am familiar with C# Programming but from what i have ...
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### What kind of lidar is necessary for SLAM?

I've read about various robots using a 2D lidar system for SLAM ( such as at IGCV, http://www.igvc.org/ ) but I'm wondering how good exactly does the sensor have to be? Specifically: What accuracy ...
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### Comparison of the efficiency of DC motor current limiting / control methods?

I am using the wheels and motors of an RC toy car as a simple robotics platform. The car has 2 motors, one drives the back wheels, the other steers the front wheels. The steering motor is stalled by ...
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### Raspberry Pi vs BeagleBone Black Rev C on vending machine

I wish to start my vending business, but none of the existing vending machines fit my needs. So, I need to choose the "brains" to my vending machine under current development. The user experience of ...
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### Measuring the performance and response rate of ESCs

How would i go about measuring and quantifying the performance of an ESC? I am looking to measure the response rate(in Hz) of an ESC, as well as it's performance(i.e how fast it starts and stops, as ...
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### Has hierarchical learning been embodied in a robot before?

I've been reading about hierarchical reinforcement learning (HRL) and it's applications. A well-written literature review on the subject can be found here. However, I was wondering if research has ...
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### Submarine screw and the isolation from the water [duplicate]

How does the submarine prevent water flow through the screw mechanism? The mechanism rotates the screw so there should be a little gap, how come the water doesn't come through this gap in to the ...
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### Swiwel castor suppliers in uk with 3D models [closed]

I'm designing a classic 2+1 wheels robotic platform, using inventor. I find very difficult to find: swivel caster suppliers, that provide a step 3D model or a mechanical drawings of their products. ...
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### Joint angle correction using LM

I have a camera mounted on a rotational joint. I need to calibrate the extrinsics of this camera. I can fix the camera at an estimated angle (facing the ceiling). Then I want to get the real angle. ...
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### Does anyone have a working example of using Qt to communicate with NXT?

I'm stumped. I've been looking through all of the Qt classes and I'm so completely and utterly lost. There are only three examples of bluetooth use in Qt, but none of them work for me. I just need a ...
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### What servos does this robot use?

Well, I wanted to use some very small servos for a project and the smallest I could find there these: https://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=33401 But Danny Choo (a ...
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### Why can't i use different ESCs together on a multirotor?

I'm working on a diy quadcopter build from scratch and have bought a 4pack ESC from Castel Creations.While i currently have my quad up and running(sort of), from what i've read on the various sources ...
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### Can I use QT to communicate with a Lego NXT robot?

QT has native bluetooth support, but can it be used to communicate with the Lego NXT robot?
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### Perfect implementation of Asimov's 3 Laws

After seeing the movie, I, Robot, I got this question. If Asimov's 3 Laws (actually implementing law 1 automatically implements the other 2) are perfectly implemented on a quantum computer that ...
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### Power switch standards and suitability for purpose

I scavenged a 4 terminal power switch (Legion EPS 21) from some electronic device (don't remember what it was) and it has the following markings on it: Legion EPS21 10A 250VAC TV-5 8A/128A 250V ...
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### Chassis materials for Hobby-weight (5.44Kg) battle robot

I have sorted out all the internals for my robot (drive systems and weaponry) and now I need to put it all together in a chassis which will be about 40 cm wide by 35 cm long by 7 cm high. I have ...
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### Simplest and cheapest way to create a spring back latch

My and a friend are hacking together a Nespresso Coffee pod dispenser. We have our heart set on a particular design after thinking up countless ways of dispensing a single pod. The design has a ...
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### Algorithm for Autonomous Navigation between two waypoints [closed]

I am designing an algorithm for autonomous navigation by a mobile robot between two waypoints. I want to design a simple algorithm but with high accuracy. Has anybody of you ever used such algorithms. ...
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### Rate PID vs Stabalize PID

I see the guide on how to tune PID for adrucopter that the rate PID gains is very small compared to Stablize PID, but i dont know why? I do the same idea, but my quadcopter cannot balance, and the ...
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### Robotics simulation from PNG map

I am a complete beginner at this. I have an arbitrary map as a PNG file (black and white, only). And I'm supposed to draw a robot at a position(x,y) and then I'm supposed to simulate the robot taking ...
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### Gyro rate gets increase problem

I am using PID controller to stabilize quadcopter. Its working well on the jig. But when I removed jig it went up and hit ceiling. I analyzed my data and from which I come to the conclusion that at ...