On 10 nov. 2009, at 21:57, vvang hua wrote:
The 278 robots demo is very fascinating, I wonder after the system
synchronized, how did you manage to arrange the group achieve an
specified e-puck icon, as in the video?
Since each bot does not have localization on it, I suspect the bots
were preset in the desired shape, and run a random walking (with
obstacle avoidance) after the balloon blast, and show us the video
in reverse? Just some wild guess.
Very good guess. It's not a secret; without localization, this is
exactly the way we made: the robot were placed on the logo, then a
balloon blast was used to have a synchronous start. Then just obstacle
avoidance. The video is then played in reverse. The goal was a good
visual effect, not to prove any robotic feature.
Looking forward to your answer.
Date: Tue, 28 Jul 2009 08:33:43 +0200
From: Francesco Mondada <francesco.mond...@epfl.ch>
To: Myles Honda <myleshonda2...@u.northwestern.edu>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed; delsp=yes
To have a common timing for all robots for our video with 278 robots
we used a balloon explosion detected by a simple threshold on the
microphones.... this gives a nice synchro and is easy to implement.
Dr. Francesco Mondada
Senior researcher, MER
Ecole Polytechnique Fédérale de Lausanne (EPFL)
Laboratoire de Systèmes Robotiques (LSRO)
EPFL - STI - IMT - LSRO
bureau MEB330, Station 9
CH-1015 Lausanne, Switzerland
tel: +41 21 693 73 57
fax: +41 21 693 78 07
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