[dorkbotpdx-blabber] Fwd: [freegeek-social] Bike Counter for
WNBR -- ideas? volunteers?
anthony.asterisk at gmail.com
Tue May 27 03:25:53 EDT 2008
Would a reed (magnetic) sensor be triggered by a bicycle wheel?
I'm imagining an array of very small reed sensors like this:
an array would be able to differentiate between 1 bike and several
Donald Delmar Davis wrote:
> I was thinking rfid myself.
> On May 26, 2008, at 2:46 PM, subbies at redheadedstepchild.org
> <mailto:subbies at redheadedstepchild.org> wrote:
>> Er......give everyone a number to stick on their bike before the race
>> I don't know that this is a very sexy technological solution. Then
>> I'm not sure having 1000 specimens of the average Portlander naked on
>> bikes is very sexy either. But if you're dying for a piece of
>> maybe you could use a hand tally counter - it's a mechanical button
>> device connected to several rotating number wheels. Biologists use them
>> when counting things all the time. Mechanics + naked biological
>> = sexy?
>> + --------
>> ------- +
>> On Sun, 25 May 2008, Daniel Johnson wrote:
>> ::Thought maybe someone here would be interested in devising a way to
>> ::accuratly count 1000+ naked cyclists.
>> ::---------- Forwarded message ----------
>> ::From: Bobby Kovacich <lowtire at gmail.com <mailto:lowtire at gmail.com>>
>> ::I don't think the hose would ever give an accurate count. If you want
>> ::to know exactly, I would say having a picture/movie of the start and
>> ::finish and maybe a few other points along the way and then count the
>> ::individual bikes in the pictures. I have the camera anda tripod...
>> ::On Sun, May 25, 2008 at 4:44 PM, Steve Kirkendall
>> ::<skirkendall at dsl-only.net <mailto:skirkendall at dsl-only.net>> wrote:
>> ::> I'm writing a countdown timer for the World Naked Bike Ride on
>> June 14,
>> ::> and the question has been asked: What should it show when the
>> ::> hits 00:00? The most ambitious idea is a bike counter, so we'll know
>> ::> exactly how many bikes our ride has. Last year, Portland tied with
>> ::> London for the largest rides in the world with about 800 riders each,
>> ::> but those were just estimates. We're hoping for around 1200
>> riders this
>> ::> year, and sole ownership of the title.
>> ::> Does anybody here have ideas on how to make a bike counter? Do
>> you have
>> ::> the hardware? Do you know how to interface it to the computer?
>> And the
>> ::> biggest question of all: Does anybody want to take on this challenge,
>> ::> bearing in mind that the ride takes place in less than three weeks?
>> ::> Here's what I'm thinking:
>> ::> Well, first I guess I'm thinking that there's NO WAY I have time
>> to do
>> ::> this myself. But if I did, I'd look to get multiple segments of
>> ::> like gas stations use to ring a bell when somebody drives up. I
>> ::> we'd need multiple hoses because with over 1000 bikers crossing a
>> ::> hose in a couple of minutes, the hose would just pretty much stay
>> ::> flattened all the time; it'd count everybody as one really big bike,
>> ::> which is obviously not right. So we need multiple hoses, each with
>> ::> its own transducer of some kind, all connected to a single computer.
>> ::> An alternative sensor design would be to use light sensors about 1cm
>> ::> above the ground. Again, with multiple sections. I don't know
>> if this
>> ::> would be easier to implement or more reliable than the hoses though.
>> ::> To connect the sensors to the computer, one idea I had was to get an
>> ::> 8-port serial board, connect each sensor to the Carrier Detect line,
>> ::> and then write software that watch for changes to all those CD lines.
>> ::> (I think 8 sections would be adequate. I haven't done the research
>> ::> though.)
>> ::> --
>> ::> Steve Kirkendall / kirkenda at cs.pdx.edu
>> <mailto:kirkenda at cs.pdx.edu> / skirkendall at dsl-only.net
>> <mailto:skirkendall at dsl-only.net>
>> ::> "Get a bicycle. You will not regret it. If you live." -- Mark Twain
>> ::> _______________________________________________
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