Robotics Stack Exchange
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What type of control law is used in "Reaction Control System" of Apollo Lunar Module or Space Shuttle?

Reaction Control Systems (RCS) on these vehicles are implemented by using small rocket thrusters. For me it looks like these thrusters work in some kind of "pulse" mode. And I can't understand - do they use some optimal control to calculate in…
neuromantik
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What is the technology used for no-resistance robot arms?

I saw a high end robot arm once that I could move and bend it to any form I wanted with no resistance, as if the robot arm didn't have any weight. I'd like to know more about them. What is this class of robot arm design called? Where can I get some…
user9539
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Quadcopter Propeller size + Motor

i would like to build quad that uses bigger propellers like 15" . My question is what kind of motor shall i use ? Low or high KV? Do all motors support this kind of propellers ? Will they burn because of it ?I found they say CW and CCW motors does…
Mirne
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Monocular vs. stereo computer vision robustness for object detection

Are there some genaral rules for the robustness between monocular and stereo vision when considering object detection? I am especially interested in the automotive field - considering distance/obstacle/car detection (see video links below). Someone…
Kozuch
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Does an electronic compass work underwater

I'm building a submersible ROV, so I need a way to navigate. So using a compass would help but this brings up the question, does an electronic compass work underwater? My thoughts are the water might act as a faraday cage, and therefore interfere…
Dane Bouchie
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role of chi2 in SLAM back-end optimization

All-most all SLAM back-end implementation compute chi2 estimates. Chi2 computation is usually used to compute the best-fitness score of model to the data. How it is related to optimization framework for SLAM? Rgds Nitin
nkd
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Comparing LQR and PID controllers for inverted pendulum problem

As far as i can tell, both LQR and PID controllers can both be applied to the cart-pole (inverted pendulum) problem. What are the pros/cons to using one controller over the other for this particular problem? Are there any reasons/situations where…
Paul
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Arduino Vin Current Limit

I've found that Arduino (Duemilanove) has a current limit of 40mA per pin. Does this include the Vin pin? Or does the Vin pin have some sort of work around in place on the board to allow for higher currents? If this is the limit on the Vin, is there…
golmschenk
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The aerial refueling problem: sketch of a feedback controller

At first happy new 2015!!! I'm looking for my next simulator development: a Tanker is flying at constant speed (350 Knots) (no acceleration, no change of altitude or direction). The Tanker is approached from behind by a UAV which needs to refuel or…
Wilhelm
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Is it practical to 3D print a refractive lens?

A lot of awesome optics projects like hacking cameras and projectors become possible with CAD lens modelling software1, if we can also easily prototype the lenses we design. What are some materials and additive or subtractive 3D fabrication…
AlcubierreDrive
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How would i go about learning to code a flight controller?

I'm interested in quadcopters/multi-rotors and want to eventually code my own flight controller ala an APM and/or Pixhawk. I've got a little experience in programming (i.e i know about if/else/else if conditionals), and have done a little…
Kenneth .J
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How do I set up a rubber hand experiment with precise latency?

The rubber hand illusion (Wikipedia) involves touching both a fake arm and a subject's real arm simultaneously. This causes the subject to feel that the fake arm belongs to him. Normally a human delivers both touches, so the timing is approximate. I…
Heather
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optimal number of robots for cooperative surveillance

Suppose we need to detect the occurrence of a special event in a large area(e.g. a city). If we need that each point being visited every h hours, how could we find the optimal number of robots for cooperative surveillance? Notice that there is no…
Hossein Abedi
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following a trajectory with LQR controller

We want our wheeled robot to follow a (rather short) trajectory. We wrote an LQR controller, which works well in simulation. However, our robot offers two problems: 1.) The reported state information does not seem to be very accurate. 2.) Its motion…
ed_wallberg
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Plastic that's transparent to IR range sensors

Sharp IR range finders are pretty popular sensors, but I usually see them externally mounted and directly exposed to the environment which makes them prone to being damaged or getting crufty. I have a few that I'd like to use on an outdoor rover,…
Cerin
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