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1500 questions
3
votes
1 answer
Weave Weld Lincoln Electric Mig Robot
This is a simple question that I can't seem to find the answer for but when setting up the weave function how exactly does frequency (Hz) determine how fast it moves back and forth?
In other words if I raise frequency will it move quicker or slower…
ExNihilo
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3
votes
2 answers
Ceiling depth with a monocular camera
Having a camera mounted on my robot and looking upwards, I want to estimate the distance of the ceiling as the robot moves and also the position of landmarks observed on the ceiling (lamps for example).
I know this is a structure from motion problem…
Mehdi
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3
votes
1 answer
Why can two Series 1 XBees only talk in X-CTU?
I have two Series 1 XBees that won't be in transparent mode because they are in AT command mode when I'm not in X-CTU. I had asked for help elsewhere and no one had the answer except telling me about flow control.
The XBees had been configured…
user10514
- 31
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3
votes
2 answers
Tuning PD for line follower
I am trying to make line following robot. I am using atmega328p mcu, pololu 10:1 motors, pololu qtr6-rc sensor, 2s li-po. Here is my code:
/*
* LineFollower.c
*
* Created: 30.04.2015 16:00:05
* Author: Mikk
*/
#define F_CPU 20000000 //we're…
mikk
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3
votes
1 answer
How can Microhard 920 series modems be made compatible with Microhard 910 series?
Microhard Systems currently sells several types of 900MHz modems, which are mostly used in robotics and SCADA applications. One of their product lines, the 910 series (MHX910, n910, Spectra 910), is obsolete and no longer sold. However, some older…
John Walthour
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3
votes
2 answers
Why the name "combinatorial"?
Why are 'cell decomposition' methods in motion planning given the name, "combinatorial" motion planning?
boon
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3
votes
1 answer
Multiple EKFs or one big
Let's say I would like to use an EKF to track the position of a moving robot. The EKF would not only estimate the position itself but also variables affecting the position estimate, for example IMU biases, wheel radius, wheel slip and so on.
My…
Isak T.
- 131
- 1
3
votes
1 answer
Inverse kinematics solution for 6DOF serial arm
My 6 joint robot arm structure doesn't meet the requirements for a closed form solution (no 3 consecutive axes intersecting at a point or 3 parallel axes...).
What would be best method to adopt to get solution in 1ms or less? Estimation accuracy…
vinjk
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- 8
3
votes
4 answers
How to rotate a dc motor at a fixed rpm
I am using 8051 microcontroller and a dc motor.What to do if i have to rotate the motor at any fixed rpm. Let's say 120rpm.
And if it is possible by generating pwm,how to do the calculations for the relation between duty cycle and rpm?
Abhishek Kulshrestha
- 131
- 2
3
votes
1 answer
Forward kinematics of constrained double pendulum
I was wondering whether maybe you could help me with this problem. I have a double pendulum. I have set the origin of cartesian coordinates to be the "head" of the first arm, which is fixed. The end of the second arm is attached to a block that…
milongo
- 33
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3
votes
1 answer
Original paper of Kalman filter
Recently we've encountered Kalman filter algorithm for state estimation in a course of Probabilistic Robotics.
After taking several days to try to read Kalman's original paper published in 1960, A New Approach to Linear Filtering and Prediction…
Xingdong Zuo
- 131
- 4
3
votes
2 answers
iRobot Create Serial Cable for Turtlebot I
I need an iRobot Create Serial Cable (one end 7-pin Mini-DIN Connector and the other end is USB) for Turtlebot I. How can I connect my bot to my PC?
Prabhu Murarka
- 31
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3
votes
1 answer
How is the absolute flash size calculated in a microcontroller?
I am working with an STM32F103C8 which has a flash size of 64kBytes.
Now i am using ChibiOS 2.6 and the build file is a binary file of 82kBytes.
Using ST-Link Utility, the program is getting dumped into the microcontroller's flash.
My question is…
user2967920
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3
votes
2 answers
Would ROS benefit from a multicore processor like Epiphany or XMOS?
I am looking for a good embedded PC to run ROS on. I recently came across a couple of little machines using new very multi-core processors, such as the Epiphany and the XMOS.
Since the one thing that ROS really seems to want is cores, would ROS be…
Rocketmagnet
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3
votes
2 answers
Gyroscope - How can I remove low frequency component with a high pass filter only?
I'm using Matlab to suppress low frequency components with a high pass filter.
Objective
Filter angular velocity measurements affected by high frequency noise and bias in order to get the best estimate of the angular position.
The output when the…
UserK
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