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Rich Grise wrote:
> On Mon, 05 Jun 2006 17:09:13 -0700, Alan B wrote:
>
>> On Thu, 01 Jun 2006 06:34:50 -0500, in message
>> <skjt72pidkbl0fd9idcei11qccstu0jpf7@xxxxxxx>, Ken C
>> <cprstn54@xxxxxxxxxxxxxx> scribed:
>>
>>>I want to attach neodymium magnets to my bicycle kickstand so my
>>>presence will be sensed by the underground sensors that control some
>>>traffic lights.
>>
>> Don't waste your time. Rather, put the kickstand down on the pavement at
>> the point where you notice the loop buried. That just might do the
>> trick. Or, start wearing stainless steel shoes and put your foot down on
>> the loop.
>
> Lay the bike down, such that the loop of the frame couples to the loop of
> the sensor, like the secondary of an air-core transformer. It'll be lossy,
> so should trigger the unit. (like one shorted turn, with a very low Q.)
> Once, someone posted some links with diagrams of riders doing this, but a
> quick search: http://www.google.com/search?q=bicycle%20traffic%20sensor
> just turns up a lot of verbiage.
You don't need a magnet, just something electrically conductive in the
field. I found the best method is to find the with the sensor line,
and center one or both of my bike tires right over it. The lower part of
the rims will be close enough to trigger some signals. Some threshholds
are just too high, only a car can trigger them. Even aluminum rims will
do, but forget about fancy carbon rims.
Mike Ross
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