Correcting Electronic Compass Errors

Projects Discussion and Showcase Device Hacking
1

Perhaps you and your associates will want to know that I've performed numerous accuracy (or lack thereof) tests on multiple rangefinders (with compass) and smartphone apps (Android/iPhone) to prove that a) they all are quite inaccurate - up to 20 degrees or more and b) the azimuth errors can be corrected in almost all cases - down to the 1 to 2 degree range. These azimuth errors are "residual" (after calibration) deviation errors; and they have always existed even though the rangefinder / smartphone vendors just ignore them.

Take a look at the test results on http://www.tru-path.org and share these results with your associates. I'm sure some of your associates will be interested. There's more to come on this subject.

Thanks for your time and consideration

2

Hi @jimdow. I had a look at your site and it looks quite interesting and well done. However, the way you are presenting it here feels more like you are just copy/pasting the same generic post to multiple platforms (I found you also posted the same thing to Reddit in a similar manner) and don't actually know or care about our community here on the Arduino Forum. That approach is not really well received here, and this forum category is intended to be a place to present projects rather than just dump links to external websites.

I think it is possible you actually might be sincere and perhaps might be willing to share relevant knowledge with the users here who have questions about subjects related to this work you did.

So I will invite you to make a presentation here on the forum thread of your work as it relates directly to Arduino projects (not to off the shelf commercial consumer devices).

3 Likes
3

Magnetometers must be calibrated in the final mounting place before they can be used as electronic compasses.

The best overview of theory and practice, with a focus on Arduino applications, is Tutorial: How to calibrate a compass (and accelerometer) with Arduino | Underwater Arduino Data Loggers

4

Sir: The information I provided to your forum members is a) new-found research information and b) quite pertinent to the Arduino forum readers who are engaged in work related to the various magnetic sensors of smartphones, electronic compasses, etc.
I am trying to share this information to as many "affected" individuals as I can within a reasonable period of time - as concisely as possible.
I would be happy to provide a "presentation" via the forum; but as you have observed, the work represented by the blog posts presents the results of my research quite effectively - as the research is quite extensive. Again, I recommend that your readers visit the blog posts at "http://www.tru-post.org" to get the complete package.
Thanks for your time and consideration.
Jim Dow

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The link in post #4 does not work.

The material linked in post #1 has nothing to do with Arduino.

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You mean https://tru-path.org/

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I’ll check the link.
Post #1 has everything to do with the accuracy of the results shown in the remaining posts.
Thanks for your observations.
Jim

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