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There are several revenue streams created by Open Source projects that don't require licensing, although the revenue stream itself is frequently protected with a license: * Support - offering support/modifications/customization for a fee. * Training - offering training and "How To" information for a fee. * Customization/modification - although in the software world, modification has to fit within the license, it can still be done at a fee. Also note that a significant revenue stream is consulting - especially for productization. Note that the rights holder of a copyright and/or patent can offer their IP under multiple licenses - a free "Open Source" license, as well as a "commercial supported" license.
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After discovering that the real-time scheduler was not in the Angstrom distribution shipped with the Beaglebone, I've decided to pursue the statistical method of determining position. There are several other reasons for this: + It allows for better portability between platforms. + Removes the need for a fast processor. Note that I'm still planing on using the tri-lateralization method of determining exact position (versus the triangulation method frequently mentioned in this project), but the various legs will be measured using statistical methods instead of direct time-of-flight. The downside(s): * Coding time will be longer for the anchor points. * Testing time will be longer. * It will take a lot of additional testing to establish reasonable baselines for statistical measurements. * It will require more "samples", which will probably adversely impact battery life on the remote sensors (ear tags).
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The http://farmhack.org/forums/tool-wiki-template link above results in a "Page not found" error. Feel free to delete this comment when/if the above is fixed!