Robotics Stack Exchange
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1500 questions
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Filling 30mL bottles with food-grade liquid

A project has been given to me at work, with no schematics or idea of where it was going. I need to fill 5 30ml bottles at a time with a food-grade liquid. Based on the parts I have, I think the design was going to use a air agitated pressure pot…
user4340
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Connect sensors to beaglebone/arduino in a complex robot

I'm building the biggest robot I've ever done. The hardware I have so far is as follows: HCR-Platform from DFRobot as a base x2 12V 146Rpm DC motor with two phase hall encoder x7 Sharp 2Y0A21 IR sensors x6 URM37 ultrasonic sensor x4 IR ground…
Christopher Valles
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How to calibrate differential drive?

I'm building a robot with differential drive. I've reached the point when I can drive it around on remote control and I'm trying to get the localization working. Now I would like to exactly measure parameters of the robot. Model of the robot I'm…
cube
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What approaches should I consider to create rotating a turret

First a bit of background, I am planning to make a highly maneuverable airship controlled by four thrust vectored propellers. I don't want to rely on a rudder and forward momentum for turns but instead be able to maneuver with direct prop thrust. I…
John Petrak
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Dead reckoning on a car-like robot with a gyro and only one encoder

Recently I began to build a car-like robot and I stumbled upon dead reckoning. I use one motor for steering and one for traction. I want to be able to get the position of the robot. From what I have read 2 encoders should be used. But I am curious…
user4281
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1 answer

How to know what motor/ESC/propeller combination will work for a quadcopter?

I am preparing for my first quadcopter build and need to know how to tell what motors/ESC's/propellers will work with each other. I also would like to know how to tell what the motors would be capable of carrying/how much thrust they have. I would…
Snappawapa
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NXT Segway problem. Need advice/help

I'm attempting to build a segway robot using a gyrosensor and accelerometer. I'm having trouble getting the robot to remain standing, for some reason, and I can't identify the problem. Here's what I know: The gyroscope API for the lejos NXT platform…
Chris
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What different sensing approaches are used in the current batch of indoor 3D cameras?

I'm aware of the PrimeSense camera powering the Kinect. Are more advanced sensor types available now in the < $500 range? For example, has there been any sort of game-changer in structured light techniques? Do decent flash lidar cameras exist now?
James Jolly
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Using robotic simulator for prediction step in probabilistic localization approaches

Probabilistic localization approaches like Kalman or Monte Carlo benefit from an accurate prediction step. The more accurate the prediction step, the more accurate is the belief of the robots pose. In most approaches probabilistic motion models are…
Johnny Mudcrab
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Precision we can expect of an ultrasound-based localisation system

I'm considering building an absolute, indoor robot-positioning system based on ultrasound Time Of Flight. Transducers will be ordinary, narrow-band, 40 kHz ones. Based on your experience, what is the best exactitude and precision we can achieve with…
Orestes Mas
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How Can I Measure the torque applied by a servo motor?

I believe that there must be a tool that can measure $oz-in$ of torque. I do not trust what the servo manufacturers state on their site for torque values, so I want to test them for myself. Can anyone suggest a tool which I can use to do this? I…
RC Hobbyist
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Removing quadcopter drift to the side

I wrote my own quadcopter firmware which is based on some older code. This code shall stabilize the copter to be always in equilibrium. The model is behaving relatively nice. I can control it with my laptop. However I noticed, that the copter is…
dgrat
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Kalman Filter when states are not observable at the same time?

I have a system that I can make a strong kinematic model for, but my sensors send readings at unpredictable times. When I say unpredictable, I am not just saying the order the readings will arrive, I also mean that sensors are able to sleep when…
tomsrobots
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What is meant by a speed profile?

When researching robots, micro mouses etc I've often come across people taking about generating "speed profiles" and how to calculate them. Also profiles for acceleration , deceleration , turning etc. Also trapezoidal profile? But I can't seem to…
binarysmacker
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How much can realistically be drawn from a 25C max 50C battery?

I am using 8 brushless motors for an octocopter. Each motor can be run at maximum 30A. I use 4 batteries in parallel. How high C number is needed? $$\frac{30*8}{4*2} = 30C$$ When running the motors at 100% load, it will draw 30C from each battery.…
Friend of Kim
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