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1500 questions
3
votes
3 answers
How to get constant motor RPM regardless of battery voltage?
I have a brushless motor with a propeller attached, driven by an ESC and a LiPo battery. I noticed that as the battery level drops, the motor spins slower, which makes sense. My question is is it possible to get constant performance out of the motor…
Johnny
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3
votes
3 answers
iRobot 600 series OI wake from sleep via BRC
I have attached an Adafruit Circuit Playground Express to my Roomba OI, and after manually waking it up I am able to successfully send opcode commands based on the Roomba OI Manual. I can even start, stop the OI and send the off op code, then…
Alexander
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3
votes
2 answers
bluetooth that could track mobile phone location
newbie here.
after my research, i couldnt find anything that could found what i wanted to search for my project(following robot for indoor location).
without gps, bluetooth only, could i get the exact position of the mobile phone im pairing…
zhang yu
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3
votes
2 answers
iRobot Create 2 Wake over Serial on Rpi
So this thread is similiar to this one:
IRobot Create 2: Powering Up after Sleep
All except I am trying to do this on an RPi.
I have followed these…
rygo6
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3
votes
1 answer
FastSlam2.0: ICP Scan Matching vs Odometry? What is the typical time step?
When working with a FastSlam2.0 algorithm, ICP Scan Matching is supposed to give more accurate measurements than odometry.
The problem is, that given some noisy measurements from the laser scanner, when the robot is stationary, or doing relative…
Guille Sanchez
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3
votes
1 answer
How can I preserve a high framerate while using at least 1280x720 resolution on 2 USB cameras on the same computer?
To expand on this, I have a down-facing camera using the whycon ROS node on Ubuntu 16.04 Kinetic on a quad-core computer with 640x480@60fps MJPG video. I'm also using the usb_cam node to publish the image_raw. I've noticed that the overall CPU…
trixr4kdz
- 133
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3
votes
1 answer
Input/output linearization
I am studying the book "B. Sicilliano -Robotics. Modelling, Planning and Control" chapter 11, Input/output linearization topic. Where does the formula for theta in 11.75 come from?
In the case of the unicycle, consider the following outputs:
$ y_1 =…
Leon Rai
- 155
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3
votes
4 answers
Localising a robot swarm non-optically
This question is further to Localizing a swarm of robots.
In summary: I want to create a swarm of robots which can each measure their own position in a 3x2m room with a 25cm high ceiling, to an accuracy of ±5mm.
There were some good answers, but…
Rocketmagnet
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3
votes
3 answers
State Space model for bouncing ball
In lecture 5.5 Bouncing ball, slide 26, Coursera's Control of Mobile Robot course, how are the state space equations formed in "Equations of motion in-between bounces"? Why is [0 -g] added?
And how is the state space equation for bounces…
kkarthick12
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3
votes
2 answers
How to approach any advanced control problem in robotics
I have worked on a couple of projects like control of a quadrotor/ self balancing robot/ 6 dof robotic arm using nonlinear, optimal and adaptive control. So, in all these projects I have first basically tried to understand the dynamics of the…
roaibrain
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3
votes
2 answers
What is the difference between Obstacle Avoidance and Dynamic Path Planning?
I always assumed that obstacle avoidance refers to general prevention of collisions with any kind of obstacles, even without considering a goal for the decision how to execute an avoidance maneuver. Is that correct?
Doopy
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3
votes
1 answer
Setting up a Structured Light Stereo system
I am trying to get started with a stereo experiment and wanted to know the mistakes I might have made during the experiment. The goal is to calculate the depth map of an object using one light projector and one camera mounted in a stereo…
Ashish Rao M
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3
votes
1 answer
How do I Calibrate Analog Thumb stick?
Outline:
I'm trying to work with an Arduino and Analog thumb stick to get values for a simple differential drive robot I'm working on. The Keyes_Sjoys Arduino Joystick Module I have in my possession is giving me some strange numbers.
Following…
Monte Carlo
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3
votes
1 answer
Difference between Collision Cone and Velocity Obstacle
I'm trying to understand these two classic approaches to path planning in dynamic environments/with moving obstacles.
According to some review papers, there seems to be quite a difference between them, e.g. so that the collision cone approach (as…
Doopy
- 191
- 5
3
votes
4 answers
Quadcopter motors vibration problem
I built an Arduino Due based quadcopter, with MPU-6050 for auto levelling and BMP-085 for Altitude.
I am using Kalman filter code from here for the MPU-6050 to take the Roll and Pitch angels from the sensor.
The Roll and Pitch angels are correctly…
Aws Abdul Salam
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