Robotics Stack Exchange
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Why do my ESCs stop working?

I'm new to robotics and this is my first time building a quadcopter. I'm unable to work out why I keep losing ESCs. Most recently in testing, I've managed to calibrate all 4 ESCs and accurately control the speed of all 4 motors. But after neatly…
Biscuits
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How to transfer signed integers with libusb?

Folks at programmers stack exchange asked me ask here: I want to communicate with an arduino and sent integers it. I code this program in C++. I initialy used bulk_transfer(), but it sends only char data. This in the API reference for…
daltonfury42
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How can I make a motion tracking camera?

I'm looking into CCTV, and am interested in minimising costs by having a motion tracking camera cover an area that would otherwise utilise multiple cameras. There is already something like this on the market manufactured by a company called…
Escribblings
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Sensing the level of a liquid in a tube

I'm looking to build a sensor which will detect the level of liquid in a tube. It does not have to be precisely accurate, just detect whether the level is approximately above a certain height. The liquid level can be seen in the red oval I thought…
sav
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Is there a bug in the Encoder Counts packets 43&44?

I think I have just found another bug - there was one that was mentioned in another post about the angle and distance. This one is about reading the encoder's counts. I was using them as a workaround for the other bugs but what I found in one…
Jack
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iRobot Create 2: Encoder Counts

This post is a follows from an earlier post (iRobot Create 2: Angle Measurement). I have been trying to use the wheel encoders to calculate the angle of the Create 2. I am using an Arduino Uno to interface with the robot. I use the following code to…
JSycamore
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Cheap and efficient 3D sensor?

I'm searching for a cheap (under 100$) and efficient 3D sensor, which detects obstacles and moving objects, for robot applications like quadrotor navigation, swarm robotics, etc. Can you suggest a sensor that can be either a commercial product or a…
acs
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iRobot Create 2: Angle Measurement

I have been working on trying to get the angle of the Create 2. I am trying to use this angle as a heading, which I will eventually use to control the robot. I will explain my procedure to highlight my problem. I have the Create tethered to my…
JSycamore
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create2 angle (packet ID 20)

how to convert the value you get for the angle (packet ID 20) into degrees? i am using the create2 robot and when I did not understand the data I am getting back. The documentation it says it's in degrees but what I get back is a huge number like…
Jack
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How to get the projection matrix from odometry/tf data?

I would like to compare my results of visual Odometry with the groundtruth provided by the KITTI dataset. For each frame in the groundthruth, i have a projection matrix. For example: 1.000000e+00 9.043683e-12 2.326809e-11 1.110223e-16 9.043683e-12…
lilouch
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Irobot create 2 C# connection

My department recently purchased Irobot create 2. We want to recreate the code from the Csharp create 2 driving Tether program to use as a base for our intro to computer science course. Currently the code we are using to talk to the Irobot is…
Chris
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Quadcopter frame design

Quadcopter frames seem to consistently follow the same X design. For example: I'm curious to know why that is. It certainly seems like the most efficient way to use space but is it the only frame design that would work for quadcopters? For…
dalton
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Are there working instances of Kilobot projects?

The interesting Kilobot project from Harvard for investigating multi-robot behavior with masses of small dumb robots has been made open hardware for a year now. However I cannot find so much activity about robot creation and movies about results.…
rics
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How to send commands to create 2 over Bluetooth

I'm very new to create 2. I want to send commands using Bluetooth. I have already bought the bluetooth USB radio. What other devices do I need to get or how can I set up sending commands over bluetooth. Any help is appreciated. Thanks.
beth
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Controlling an ESC for Brushless Motors with an RPi

I'm looking to build a new (first) quadcopter without the conventional flight controller and radio, with an onboard RPi and applying some newfound knowledge on autonomous control to improve my coding skills. Although, since I've never actually built…
Shreyas
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