Tag Archives: muCSense

Implementing the Gauss-Newton Algorithm for Sphere Fitting (3 of 3)

Posted on September 15, 2012 by Rolfe Schmidt

The first post in this series made it clear that the major computational and storage costs to implementing the Gauss-Newton algorithm come in computing the matrices and . By carefully avoiding materialization of the Jacobian matrix and the residual vector, … Continue reading →

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Implementing the Gauss-Newton Algorithm for Sphere Fitting (2 of 3)

Posted on September 8, 2012 by Rolfe Schmidt

I sketched a naïve implementation of the Gauss-Newton algorithm for sphere fitting, and provided an implementation in Octave. While it works fine on a laptop, it uses far too much memory to handle more than a handful of calibration samples … Continue reading →

Posted in Mathematics | Tagged , , , , , , , | 2 Comments

Implementing the Gauss-Newton Algorithm for Sphere Fitting (1 of 3)

Posted on September 1, 2012 by Rolfe Schmidt

In some calibration strategies we encounter a sphere fitting problem: we need to find the map that does the best job sending the observed data to a unit sphere. This simple problem statement leaves two critical questions unanswered. What family … Continue reading →

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muCSense: Using Calibration

Posted on August 28, 2012 by Rolfe Schmidt

I just added some new code to the muCSense library to help calibrate accelerometers and magnetometers. I plan to use the framework to add calibrators for gyros and other sensors too. In this post, I’ll walk through an example sketch … Continue reading →

Posted in Electronics, How To | Tagged , , , , , , , , , | 3 Comments

muCSense: Introduction and Example

Posted on August 24, 2012 by Rolfe Schmidt

In my last post I walked through the steps you need to take to establish a simple connection with the three sensors on SparkFun’s 9DoF Sensor Stick. If you took those code snippets, dumped them into one file, and ran … Continue reading →

Posted in Electronics, How To | Tagged , , , , , , , | 5 Comments