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| Wave Pendulum (Day 17) http://www.getinpulse.com/hack/forum/viewtopic.php?f=7&t=280 |
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| Author: | hudson [ Tue May 10, 2011 6:42 pm ] |
| Post subject: | Wave Pendulum (Day 17) |
Today's watch was inspired by the beautiful patterns that can arrise from simple harmonic motion of wave pendulums. The longest bob swings at 30 times per minute (0.5 Hz), the next longest 31 times per minute and so on until the shortest swings 60 times (1 Hz). Various patterns appear to emerge, but they are just beat frequencies that play tricks on your mind. There is an auxillary perl script that computes the proper lengths for the pendulum bobs to ensure that the correct periods are maintained. Due to rounding errors in the integer math, sometimes the patterns are not as clean as the real world. The pendulums also never run down, although there appears to be an integer overflow bug that resets them to the starting position every minute or so. Source: https://bitbucket.org/hudson/watches/src/tip/pendulum/ Video: http://www.flickr.com/photos/osr/570912 ... 084215019/ |
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