Robotics Stack Exchange
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1500 questions
13
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4 answers

Do magnets affect IMU values?

Im in the process of making a robot which requires 12 3x10mm cylindric magnets for the construction. They are 30mm from the center of the robot where I plan to have the IMU. I was thinking about using MPU-6050. Do magnets affect the values? If yes,…
user697
13
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2 answers

Differences between Ackermann steering and standard bi/tricycles concerning kinematics?

I got the following homework question: What are the general differences between robots with Ackermann steering and standard bicycles or tricycles concerning the kinematics? But, I don't see what differences there should be, because a car-like…
Daniel Jour
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What is the difference between SAM and SLAM?

What is the difference between Smoothing and Mapping (SAM) and Simultaneous Localization and Mapping (SLAM)? These general approaches seem closely related. Can someone describe the differences?
Stefan
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How can I detect if a DC motor on a robot is starting to fail?

What characteristics can I look for which could be reliable early warning signs that a DC motor on my robot, say one used for the drive, could be failing? I'm looking for an answer that deals in terms of sensors rather than manual inspection, so a…
berry120
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4 answers

How to obtain dense point clouds from stereo cameras?

I am trying to use a stereo camera for scene reconstruction, but I can usually only obtain sparse point clouds (i.e. over half the image does not have any proper depth information). I realize that stereo processing algorithms rely on the presence…
georgebrindeiro
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2 answers

Should I switch my servo system from brushed to brushless motors?

I have a robot that uses brushed motors in its servo system. These are Maxon 3W motors, with 131:1 planetary gearboxes. The motors are controlled by a PIC microcontroller, running a 1kHz PID controller. The servos are for a low speed high torque…
Rocketmagnet
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Creating a fast, uniform, linear actuator

Most of the linear actuators I've seen are nonuniform and/or slow. Those using a cam or crankshaft-like mechanism (and nearly anything hydraulic/pneumatic) cannot be moved at a constant speed without some programming. Those using a screw-like…
Manishearth
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Approach to using PID to get a differential robot driving straight

Consider a differential drive robot that has two motorized wheels with an encoder attached to each for feedback. Supposed there is a function for each DC motor that takes a float from -1 to 1 and sets the PWM signals to provide a proportional amount…
Robz
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5 answers

What reward function results in optimal learning?

Let's think of the following situations: You are teaching a robot to play ping pong You are teaching a program to calculate square root You are teaching math to a kid in school These situations (i.e. supervised learning), and many others have one…
Shahbaz
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How to stabilize a quadcopter

Today was my quadcopter's first "flight". I'm running megapirate on a Crius AIOP v2 with a Turnigy Talon v2 frame. I only touched the throttle stick on my remote, nothing else. When I felt the quadcopter was about to take off, I pushed the throttle…
mimipc
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2 answers

Is it better to have weight distributed over the wheels or the center of the robot?

When designing a standard 4 or 6 wheel robot, is it better to have the weight distributed primarily in the center of the robot, or over the wheels, or is there no difference? Specifically, which weight distribution will make the robot less likely to…
Michael0x2a
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3 answers

Web mapping that can be used for autonomous vehicles/robots

Is there web mapping tool that allows developers to use it to plot GPS data of autonomous vehicles/robots? Google Maps forbids it. See 10.2.C. Google Earth terms of use link jumps to the same page. Bing Maps looks the similar (see 3.2.(g)). What I…
IsaacS
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What is a good approach to a Quadruped Gait?

I have a small quadruped with three degree of freedom legs which I have been working on: 3DOF Mini Quadruped. My original code for it was a simple servo controller on the arduino, and Scala code which would send servo commands over the wire. I did…
Ian McMahon
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12
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3 answers

What determines the amount of noise an actuator produces?

Many robots and other mechanical devices produce the signature whirring noise as they move, some produce less. What makes the difference? What restrictions a silence requirement places on a robot?
Ansis Māliņš
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5 answers

In HRI, how is the "uncanny valley" experienced by people on the autism spectrum?

I'm familiar with the idea of the uncanny valley theory in human-robot interaction, where robots with almost human appearance are perceived as creepy. I also know that there have been research studies done to support this theory using MRI scans.…
WildCrustacean
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