Robotics Stack Exchange
Robotics Stack Exchange

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1500 questions
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1 answer

What tyre tread would be best suited to an off road robot expected to deal with frequently muddy conditions?

I'm looking to potentially build an autonomous robot that will frequently venture off road, and remain autonomous for up to 6 hours at a time. I've found limited information however about the best tyre tread for this purpose, what could be most…
berry120
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Selecting an accelerometer for Deduced Reckoning

I have never used an accelerometer before, but I am aware that they come with I2C, SPI and analog outputs. If I choose to use an I2c or SPI, device, will I accumulate errors due to communication time? Is the fast sampling of an analog signal likely…
Lord Loh.
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With a 6-axis robot, given end-effector position and range of orientations, how to find optimal joint values

Given a six-axis articulated robot arm holding a tool at its end-effector, if I have a desired tool position and tool orientation, there will be exactly 1 solution to the inverse kinematics equation for the robot to reach that position. (or rather…
HugoRune
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2 answers

Correct way to use Subsumption Architecture with Robot C

I've been doing a lot of reading lately about Subsumption Architecture and there are a few different ways people seem to advocate. For instance some people use a global "flag" variable to have a task take control. Others use the endTimeSlice() and…
James MV
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My Raspberry Pi is losing power in a surge

I have an RC car. The battery provides power to the ESC and then the ESC provides 6 V back out to the receiver. Instead of the receiver I have a Raspberry Pi, which uses the 6 V, steps it down to 5 V and provides power to the Raspberry Pi. The…
HAL9000
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3 answers

How to deal with sonar crosstalk

Our robot has a circular array of 12 sonar sensors that looks like this: The sonar sensors themselves are pretty good. We use a low-pass filter to deal with noise, and the readings seem pretty accurate. However, when the robot comes across a flat…
Robz
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What are the signs that a servo might be broken?

I just got a kit and im not sure if its me or not but it appears one of the continuous servos might be broken. What happened first when I plugged it into the microcontroller, it made a humming sound when I sent it commands. The second continuous…
Ess Kay
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Where does Gazebo set the GAZEBO_MODEL_PATH environment variable?

I'm starting out with Gazebo (1.5) at the moment and am following a tutorial off the internet. In order to get Gazebo to find the model, the author advocates manually exporting the GAZEBO_MODEL_PATH environment variable via export…
ThomasH
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How to make an "invisible line following robot"?

I would like to build a robot which follows a virtual path (Not a visible path like a 'black line on a white surface', etc). I'm just enthusiastic by seeing some sci-fi videos which show robots carry goods and materials in a crowded place. And they…
Nitin
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kalman filter with redundant sensors

Suppose I have one robot with two 3D position sensors based on different physical principles and I want to run them through a Kalman filter. I construct an observation matrix two represent my two sensors by vertically concatenating two identity…
fumigail
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What's the difference between a holonomic and a nonholonomic system?

I was wondering if a 1D point mass (a mass which can only move on a line, accelerated by an external time-varying force, see Wikipedia - Double integrator) is a holonomic or a nonholonomic system? Why? I think that it is nonholonomic since it cannot…
user137589
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How do I convert link parameters and angles (in kinematics) into transformation matrices in programming logic?

I'm doing robotics research as an undergraduate, and I understand the conceptual math for the most part; however, when it comes to actually implementing code to calculate the forward kinematics for my robot, I am stuck. I'm just not getting the way…
Grace
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Unscented Kalman Filter for Dummies

I need some help here because I can't figure how the Unscented Kalman Filter works. I've searched for examples but all of them are too hard to understand. Please someone can explain how it works step by step with a trivial example like position…
Thiago Bezerra
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How can I send video from my Arduino camera module video to my Android screen?

I'm trying to connect a camera module to my Arduino Mega, connect my Mega to my Android phone (throught BlueTooth or other), and send the live view of the camera to the mobile phone. I saw a video online that showed this for still images -- an image…
mabdrabo
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Are power and torque required related in some way?

I am designing a new platform for outdoor robotics and I need to calculate the power and/or torque that is needed to move the platform. I have calculated that I need about 720 W of total power to move it (360W per motor), but I don't know how to…
Plecharts
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