Hi Harold. There's been a post recently here - and on Hackaday < http://hackaday.com/2015/01/24/trinket-uses-rf-to-track-you-through-the-hou= se/> about a guy using RF time of flight measurements to determine where he is in his house. He has made some good progress and I think that things would be a lot easier at audio frequencies using sound. Might be worth a quick look. Richard On 27 January 2015 at 04:17, Harold Hallikainen wrote: > I have an application where I need to determine the positions of > loudspeakers as XYZ coordinates in a room. It seems that this could be > done entirely with distance measurements (with a "laser measuring tape'). > If I measure the distance to a point from two known positions, it seems > that the distances would represent radii of spheres, and there would be a > circle where they intersect. The point of interest is somewhere on that > circle. Adding a third measurement from a known point should get us down > to one point. Can anyone point me to information on such a "navigation > system?" > > Thanks! > > Harold > > > -- > FCC Rules Updated Daily at http://www.hallikainen.com - Advertising > opportunities available! > Not sent from an iPhone. > -- > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .