[Robotgroup] Star Projector

[Gray Mack]

not bad for 2 years ago, but now green lasers are much
less than $100-150. 
Here are some for <$40
http://www.instapark.com/category/laser-products/?gclid=CICi6cKJ4o0CFQRuZQodSy8KmQ

I recently saw a homemade thing like this made from
pvc pipe that pointed several red lasers through a
slowly rotating disk. I dont know what the disk was
exactly. It looked like diffraction grating but may
have been a more specialized holographic plate. It
produced a calidiscope of 100's of moving points in
the trees. It probably could have been done with one
laser and some beam splitters but red lasers are
cheaper than beam splitters. Also it didnt produce the
nebula clouds like the commercial product.
-Gray

--- Vern Graner <vern at txis.com> wrote:

> I found that projector that John was using for
> projecting star fields on 
> the cieling:
> 
> http://www.thinkgeek.com/gadgets/lights/8ed4/
> 
> A little pricey! :)
> 
> Vern
> 
> -- 
> Vern Graner CNE/CNA/SSE    | "If the network is
> down, then you're
> Senior Systems Engineer    | obviously incompetent
> so why are we
> Texas Information Services | paying you? Of course,
> if the network
> http://www.txis.com        | is up, then we
> obviously don't need
> Austin Office 512 328-8947 | you, so why are we
> paying you?" ©VLG
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