[dorkbotpdx-blabber] Re: counting bicycles

[Michael Bunsen]

I'd be interested in getting together with someone in the next week to
try out the tube + piezo approach. I have some different size piezos
but no tubes.

Michael


On Wed, May 20, 2009 at 8:11 AM, Fred Smith <fxsmith at gmail.com> wrote:
> Has anyone in the group given this any more thought?
>
> As an exercise, I put together a pd patch that takes an analog input
> from the arduino - triggers a random sample and writes a timestamp to
> a file when an input threshold is crossed. It's currently being driven
> by a pot wired into one of the arduino's analog inputs - I suppose
> next step is replacing the pot with a piezzo.  Too bad those $50
> scopes are on back order....
>
>
>
> On Wed, May 13, 2009 at 9:45 PM, Jim Larson <jlarson at pacifier.com> wrote:
>> Careful with using thinner tube - it's not the total weight of the load,
>> it's the psi that matters to the tube. Cars/trucks put about 30 to 50 psi on
>> the ground; a bike hits it with 50 to 100. The pressure seen at the sensor
>> will be low since the volume displacement is small, but the compression
>> forces on the tube will be pretty high.
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