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The first post in this series made it clear that the major computational and storage costs to implementing the GaussNewton algorithm come in computing the matrices and . By carefully avoiding materialization of the Jacobian matrix and the residual vector, … Continue reading
I sketched a naïve implementation of the GaussNewton 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
This is the third post in a series. Introduction Simple Methods LeastSquares and Gauss Newton Implementing GaussNewton on an ATMEGA (this post) Error Analysis ? Quick Summary This post is short on explanations, I just wanted to something a … Continue reading
This is the third post in a series. Introduction Simple Methods LeastSquares and Gauss Newton Streaming GaussNewton on an ATMEGA Error Analysis ? In the last post we looked at some simple calibration methods and they didn’t seem to … Continue reading
This is the second post in a series. It starts here. Now let’s look at some of the simplest methods we can use to calibrate an accelerometer. By “simple” here I mean simple all the way through: easy to … Continue reading
In my last post I described how to start reading data from an ADXL335 accelerometer with an Arduino and convert those voltage readings into standard units. I even showed some real data coming out of my device and when you … Continue reading
My first home electronics project — a device to measure leg acceleration and balance while skiing — involved connecting an ADXL335 on a Sparkfun breakout board to an Arduino Uno. Going in, I was an experienced programmer but knew nothing … Continue reading