-----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 to the MIT football field, because it is a large, flat, open space with clearly labeled distance markings. Unfortunately, there were no markings visible on the field, so I made measurements on the adjacent long-jump track, which is labeled in feet. Measurement worked perfectly up to 30 m (100 ft), with at most 1 cm of variability, and usually none. Measurement worked unreliably up to 40 m, giving spurious answers except during lulls in the wind. (Almost all microphones record high-amplitude noise in the presence of wind.) I have several ideas for increasing range (or equivalently, improving noise tolerance). However, I did not make any attempt to implement them, because it was too cold out for programming. 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. After switching to mesh channel 11, I had no difficulty sharing over distances up to 40 m. - --Ben Schwartz -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.7 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFHQMRCUJT6e6HFtqQRAiaLAKCMbxGd4W0kk9WutMSuGrwxSohkQQCdECDB hTrx9Mz95WyPW4zFVmT3Ub0= =hRjf -----END PGP SIGNATURE----- _______________________________________________ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel