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Amazing work Chris! Seeing metallic objects suspended in air never gets dull.
;-)
I also really like how you integrated all the electronic into the LEGO frame.
Impressive, most impressive...
Mladen Pejic, over and out!
http://www3.sympatico.ca/mladenpejic/
In lugnet.build, Christopher Snead writes:
> Hello, everyone!
>
> I've finally finished a project for my Physics class:
>
> http://www.brickshelf.com/cgi-bin/gallery.cgi?f=8857
>
> This device suspends small, ferromagnetic objects in midair using an
> electromagnet and a beam of light. The beam of light shines on a
> phototransistor, which translates via a control circuit into current to the
> electromagnet. An object in the path of the beam reduces the amount of light
> incident on the phototransistor. As the object falls, more light reaches the
> phototransistor, and the magnet gets stronger; as the object moves towards the
> magnet, less light reaches the detector, translating into a weaker magnetic
> field. The object reaches equilibruim, and hangs in midair!
>
> I used Lego to build the frame and the light shields. As it turns out, the
> LED's and the phototransistors fit quite well into the technic holes. Using
> Lego saved quite a bit of time, as opposed to machining an apparatus. It also
> allowed me to play with Lego while working on my final project! ;-)
>
> Sorry to all of the Purists out there - Lego does not yet make electromagnets
> or Phototransistors or op-amps. Don't worry, I'll be back to building pure
> Lego mecha in no time...
>
> Chris
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Message is in Reply To:
 | | Magnetic Levitator
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| Hello, everyone! I've finally finished a project for my Physics class: (URL) device suspends small, ferromagnetic objects in midair using an electromagnet and a beam of light. The beam of light shines on a phototransistor, which translates via a (...) (23 years ago, 6-Dec-01, to lugnet.build, lugnet.general)
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