[dorkbotpdx-blabber] Fwd: [freegeek-social] Bike Counter for
WNBR -- ideas? volunteers?
Anthony Asterisk
anthony.asterisk at gmail.com
Thu May 29 16:27:16 EDT 2008
My latest thought on how to do this simply:
Make a set of parallel bicycle slalom/obstacle courses out of cones
that act as cattle chutes and use 1 rubber tube counter per course.
This will be fun for participants, easy to set up, and will create
controlled flows that will be easily counted. By having many paths in
parallel you eliminate bottlenecking that would cause everyone to divert
around.
A*
dan p wrote:
> yep, get it.
>
> if instead of the rubber tube, you had a series/matrix of LASERs (caps
> as it is an acronym) maybe in more than one color, maybe some sort of
> series of perpendicular to the path of travel, and a few at several
> angles. They could be positioned at several heights (low to see
> tires, four breaks per bike if more than a couple inches above the
> ground, roughly torso height? you could look for min/max beam
> interupt to see if your seeing two signals from one person (arm then
> torso) or if someone has big tires then you would see two big beam
> breaks instead of 4 shorter ones.
>
> The multi colored LASERs would add to be party like feeling and you
> wouldn't need to worry about sticker pattern recognition, or nipple
> recognition, or tripping people on hoses (you may have to worry about
> blinding people with multiple lasers pointed at them, but life is a
> series of tradeoffs).
>
> just more random thoughts, maybe this one is a bit more reality based.
>
>
> On 5/29/08, *Frank Canaan* <fcanaan at gmail.com
> <mailto:fcanaan at gmail.com>> wrote:
>
> Chances are a cattle chute setup will make almost all of these
> ideas easier to implement... Funneling people into a thinner
> stream will make things more accurate.
>
> On Wed, May 28, 2008 at 7:40 PM, <subbies at redheadedstepchild.org
> <mailto:subbies at redheadedstepchild.org>> wrote:
>
> wellllll, you could even throw in the last
> colored-sticker-on-helmet-for-Processing in tandem with my idea
> (making it colored sticker on helmet with number) and thereby
> try *three*
> out all at once.
> -Alexis
>
> + --------
> redheadedstepchild.org <http://redheadedstepchild.org/>
> ------- +
>
> On Wed, 28 May 2008, Donald Delmar Davis wrote:
>
> ::How about we pick 2 methods (ground sensor image processing)
> with alexis's
> ::sticker idea as a control mechanism and implement them.
> ::
> ::Document the results.
> ::
> ::
> ::Management. We need some management here.....
> ::
> :::)
> ::
> ::On May 28, 2008, at 10:23 AM, Mykle Hansen wrote:
> ::
> ::>
> ::> On May 28, 2008, at 7:42 AM, Jason Plumb wrote:
> ::>
> ::> > I've always wondered how those things work and what the
> response rate is
> ::> > like. Do they really just give an on/off or are they
> using a summing
> ::> > pressure system of some kind? Are they *really* capable
> of detecting when
> ::> > two cars/bikes pass over very *very* close together?
> Just given the
> ::> > number of cars on the road, isn't there a pretty high
> statistical
> ::> > probability that two will hit in the same millisecond
> (or lower)...so how
> ::> > do *they* handle it?
> ::>
> ::> i don't know exactly how, but here is a paper from 2002,
> in which
> ::> NZ traffic engineers tested some of the tube devices on
> the market
> ::> for counting both cars and bikes:
> ::>
> ::>
> http://www.ipenz.org.nz/ipenztg/papers/2002_pdf/34_MacBeth.pdf
> ::>
> ::> i worry, tho, that with their sample size of 50 bikes they're
> ::> not close to hitting the level of traffic we're expecting.
> on the
> ::> other hand, it's all about the sample rate ... not just
> the chip,
> ::> tho, it's also limited by the properties of air in a tube.
> but
> ::> if the rate is high enough, it ought to be able to reduce this
> ::> problem to an acceptably low level.
> ::>
> ::> > At 15mph, bikes wheels spaced 1.3cm apart will hit the
> sensor within 2ms
> ::> > of each other (hitting Paul's 500MHz example). 1.3cm
> ain't big, but it
> ::> > also ain't tiny. I could see this happening in
> reality....so the question
> ::> > is, what do you do with the missing/bad
> counts/anomalies? Is it ok to
> ::> > drop somebody?
> ::>
> ::> one option is to funnel the ride through some narrow counting
> ::> point where the possibility of side-by-side riders is lower,
> ::> and lay the tube there. another is to use multiple counters
> ::> in multiple locations and average the results. (i was going
> ::> to suggest running a group of tubes at different angles, until
> ::> i imagined riding over that naked. =)
> ::>
> ::> -m-
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> --
> -Frank Canaan
> fcanaan at gmail.com <mailto:fcanaan at gmail.com>
>
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