Robotics Stack Exchange
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1500 questions
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2 answers

Singularity problem at Inverse kinematic solver

I am struggling with this problem for days. I really hope that someone could give me a hint what the problem is. The robot consists of 5 axes. The first axis rotates around the z-axis and other 4 axes rotate around the y-axis. And the solver…
Joe
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6 answers

Polling or Timer interrupt?

We hope to build a simple line follower robot and we got a problem when we were discussing about PIC programming. We planed to write a endless loop, check the sensor panel reading and do the relevant stuff for that reading. But one of our friends…
RONEY
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What is the definition of `rollout' in neural network or OpenAI gym

I'm relatively new to the area. I run into several time the term ``rollout'' in training neural networks. I have been searching for a while but still not sure what it means. For example, the number of rollout for running the hopper environment. I'm…
Ali
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1 answer

How can I manipulate real-time sonar data from my Arducopter in Arduino?

I have a APM 3DR Quad with a 3DR radio telemetry kit. I would like to send real-time sonar data to my laptop (running Windows 7) in order to manipulate it in an additional Arduino Sketch. The sonar sensor is connected to an Analog In channel on…
user1702
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3 answers

How do I motorize the elbow socket and other joints in a powered exo-skeleton?

How would you motorize the joints in an Iron Man suit? You need something fairly shallow, I would think, probably dual servos sitting on either side of an elbow or knee joint or either side of your hips, but how do you get motorized action there…
Erik Reppen
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2 answers

Why can Humans single out audio in a crowd? What would it take for a robot to do the same?

I was at a Robotics conference earlier today and one of the speakers mentioned robots not being able to function as well in a crowd because they can't single out audio like a person can. Why can people single out audio so well? And what would it…
Sponge Bob
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8
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1 answer

Is it possible to list all runtime dependencies for ROS

I've read this link: http://wiki.ros.org/kinetic/Installation/Source and have known that the command rosdep install --from-paths src --ignore-src --rosdistro kinetic --simulate can list all necessary dependencies of ROS on a clean system. Also, I've…
Yves
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8
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2 answers

H-bridges and stall current

For a DC motor with a stall current of 950 mA, what should the H-bridge's current rating be? What will happen if we use our H-bridge L293D whose max. output current is 600 mA?
Umer Zonair
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8
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3 answers

Quadcopter application underwater

Just out of curiosity, can the concept of a Quadcopter be applied to an ROV? Would it work the same way underwater as it would be in Air? If not what kind of modifications it would take to implement that idea, underwater?
Chandough
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1 answer

How are units of noise measurement related to units of a sensor's data measurement?

I'm trying to understand how noise is represented for accelerometers, gyroscopes, and magnetometers so that I can match the requirements of my project with the standard specs of these sensors. I want the output of a 3 axis inertial sensor to be…
Robz
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1 answer

Why do we need ROS?

I'm a beginner in robotics and I'm planning to do a basic navigation problem for differential drive robot. I know the concept involved and can code it in the arduino but I came to know about ROS and other robotic toolbox. How is it useful if I…
ArAvind
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1 answer

Prop orientation for tricopters

This question stems from previous question, where I asked why does the prop orientation matter so much for a multirotor. But on further research† I found that these reasons need not apply to a tri copter. and then again. Why? Are these reasons…
Chandough
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8
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1 answer

What are the mechanics of translational drift?

Concerning robots which rotate at high speed by spinning the drive motors in opposite directions, while still being able to simultaneously move in a direction (translate): As far as I know this originated with competitive fighting robots, where it…
jzx
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8
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5 answers

Using an Xbox controller to fly a Quadrocopter

So I have a quadrocopter, it does come with a remote but I intend to run certain modifications to the copter, like installing a camera, a mechanical manipulator, and other random modifications. The remote that comes with the copter isn't flexible…
Chandough
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8
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2 answers

Wheel Odometry Covariance Matrix for Custom Robot

I have been looking around in the forums, but could not find any answer for how to go about getting the wheel odometry covariance matrix for a custom built planar robot (I found some posts related to EKF, but could not find any clear solution). I…
robotics enthusiast
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