Lots of ways to do this but something cheap and easy is using a
gameport as it has one I/O port (for the fire button) and an A/D -256
up to +256 assigned voltage values as are produced from a moving
potentiometer.
The main question is do you just want to measure one discrete movement
or a series of them? That what will determine what kind of sensor or
sensor array you need. I'd imagine with telekinesis, you just need
that one shot.
The other question that might be a factor in success is interference
as in would a light or energy source used in the sensor affect the
experiment?
I would use an IR led and detector, creating a beam that the object
must break. You could also use something more exotic like Kynar piezo
film which can detect pressure and it would act like a variable sensor
as the object slid across it, but that's really more than you need.
Microswitches come in a wide assortment of styles which have various
levels of pressure needed to trip the switch, some have leaf arms but
I don't think this would work for you as you need something with no
resisting pressure and no trigger window since you are talking 1,000th
of an inch or so.
The above are referring to physical movement, moreso than weight
changes.
I would use an optical sensing system because it is non-contact, you
can vary the sensitivity and trigger window.
A couple of years ago I had the opportunity to visit a dream lab where
they do sleep disorder and other studies. They took a bicycle inner
tube and slit it to make a giant rubber strip, then connected a
poteniometer to it and place it around the subjects chest.
As the subject breathed in and out, it triggered this switch and
recorded the time, so you could see how MUCH the chest expanded and
contracted as well as how often....It thought it was a cool redneck
way to collect this data into a file as the system monitored the
client sleeping.
---c_costigan@canada.com wrote:
>
>
> I'd like to know if anyone has a url for telekinesis resources on
the net. I've been experimenting for a number of years and have had
some small success. The net has some stuff that is a little too
esoteric for my purposes. What is required is an experimenter's type
of device.
>
> Chiefly, what I'm looking for is a homebrew device that can
electronically detect a change in mass, density or location (i.e. if
it moved a thousandth of an inch, etc) of a specific object.
>
> I'm a computer programmer, not an engineer or electronics person, so
if I can't find something, I'll probably have to figure out how to
build one.
>
> CC
>
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