Robotics Stack Exchange
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DH Parameters with offset base

I'm looking at a pan tilt (RR) system. I want to define the kinematics between a world frame and the end effector. Every example I've seen looks at the world frame as being at the first joint (the zero frame). Can DH parameters be used with an…
SP00N
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laser scanner distance

I'm looking at laser scanners and I see a huge range of detection distances. The furthest I've see are 30m if you exclude the very expensive ones that claim up to 150m. My question is what is the reason for the huge difference in range/price. I…
JDD
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How many robots is considered to be a robotic swarm not a group of robots?

Does the literature on swarm robotics define the smallest number of robots required to make a "swarm". Is it 10, 20 or 100 robots, or does the name depend on something other than the number of robots?
kiabonov
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Confusion in fixing DH frames

I am analyzing a concept of a surgical robot with 4 revolute joints and one sliding joint. I am not able to fix the coordinate frame for last prismatic joint. Following are the schematics of robot and DH frames I have fixed As X4 axis and X5 axis…
Siddhesh
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Inferring joint orientation on multi-joint arm

Not a robotics question in the strictest sense, I guess, but related closely enough, I hope: I have an arm-like articulated two(-plus-one)-joint appliance that I want to use as a 3D input device. It uses an angle measurement device and two IMUs,…
Sty
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PID Conundrums for Legged Robots

I am currently working on a legged hexapod which moves around using a tripod gait. I have two sets of code to control the tripod. Set 1: Time based control In this code set, I set the tripod motor set to move at their rated rpm for a required…
Naresh
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How do timings affect input, sensor fusion, and output?

I'm programming a quadcopter controller. I've managed to make it fly. But, I'm not sure how to set up the timings schedule for each part of the software. I have several sensors (gyro, accelerometer, magnetometer, barometer) with output at various…
Martin Deegan
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Pushing Buttons Remotely over Ethernet

So I want to program something that will simply push a button, but controllable over ethernet. I'm new to robotics so I don't know where to start. What's the best way to control an actuator over a network connection?
TomSchober
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ROS for an autonomous boat

As part of an internship I was asked to design and develop the core control system for an autonomous small-scale (2m length) solar vessel to be able to sail around the Baltic Sea. The boat should be able to sail following predefined waypoints but,…
Anelito
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Marginalization in Graph SLAM

I have several questions about the process of marginalization in SLAM algorithms: 0 - What are the mathematic intuition behind marginalization process 1 - I know marginalization of states or points is related with removing nodes from the graph and…
Ricardo Achilles
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Send Arduino sensor data to server with GPRS shield

I'm trying to send Arduino sensor data to a server using a GPRS shield (SIM900 shield from Geeetech). I have this particular set up because the data will be updated to a website and the device will be roaming. I can't use http://www.cosm.org because…
ecki
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What is the easiest way to install ROS on OSX Mountain Lion?

The latest OSX documentation I found on the website is from 2011, and the latest build is from over a year ago. I'm a complete n00b to all things ROS and wanted to start playing with it. What is the easiest way? Edit: this version of the…
agentofuser
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Would the strength and speed of a robot skeleton be a danger to its wearer?

Expanding upon the title, I am querying the use of robotic skeletons to augment human strength and speed. If such a robot had the capacity for example to bear weight 5 times heavier than the wearer and move its robotic limbs twice as fast as the…
MICHAEL TAYLOR
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Does multiple IMU increase accuracy

I'm just starting up with IMU's and I really want to work on my own flight controller, but a question always hits my mind and I am not able to find answer anywhere, so I'm here. Will multiple IMUs will help improving stability of a quadcopter?…
Tanishq Jaiswal
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Limits of PWM, Timers and Interrupts?

I have a robot with two wheels/motors and each has a quadrature encoder for odometry. Using the wheel/motor/encoder combo from Pololu, I get 48 transition changes per rotation and my motors give me a max of 400RPM. I've found it seems to miss some…
Robert
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