Acoustic distance measurement test results

2007-11-18 Thread Benjamin M. Schwartz
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Joyride builds currently include my Acoustic Tape Measure activity, designed to turn any pair of laptops into a tool for measuring distance. Today, I decided to test the maximum range. I used two B4's running clean installs of joyride 289. I went

Re: Acoustic distance measurement test results

2007-11-18 Thread quozl
On Sun, Nov 18, 2007 at 06:01:22PM -0500, Benjamin M. Schwartz wrote: I also encountered some difficulty when sharing the activity over the mesh at distances greater than 25 meters. This might be because the default mesh frequency (Channel 1) is the same as MIT's pervasive wireless network.

Re: Acoustic distance measurement test results

2007-11-18 Thread Benjamin M. Schwartz
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 [EMAIL PROTECTED] wrote: How high off the ground were the laptops? At ground height, with ears up, the node to node transmission distance is very small. That's why school server antennas will be mounted high. The laptops were sitting directly on

Re: Acoustic distance measurement test results

2007-11-18 Thread James Cameron
On 19/11/2007, at 11:31 AM, Benjamin M. Schwartz wrote: The laptops were sitting directly on the ground. Good, consistent results confirmed. Specifically, the laptops were sitting on the rubberized track surrounding the field. The surface appeared perfectly level to me, and free of

Re: Acoustic distance measurement test results

2007-11-18 Thread Jim Gettys
Heh. He said MIT; the field is surrounded by dormitories: very noisy environment -- Jim Gettys One Laptop Per Child ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel