> Ever sort of moved it around fast on a wall and get cool designs?  I
had the idea
> that one could do something like that and maybe create designs, text,
pictures.  But
> the mechanical part of having something move that fast and in all
directions seems
> to me to be the difficult part.
> 
> Maybe moving a mirror instead of the laser would be better, but again
how to move
> it like that confuses me.
> 

  Hmm mirror sounds like a better idea to me. The deflection in the beam
is double the deflection of the mirror (if I still remember my physics
right!). Also I would think that another trick would be to mount the
laser further away from the screen, this would help with speed however
brightness might become an issue (do it in dim settings?).

	As for moving the mirror, my I suggest perhaps two servos, one
mounted to provide yaw and the other tilting vertically. Perhaps
something like one of the cheap mirrors that can rotate about one axis
on their holder can be modified.

	A good thing about servos would be they have position control
built in and their angle of travel should be enough. Response time is
pretty quick too.

------------------------------------------------------------------------
Daniel Chia

"Genius is one percent inspiration and ninety-nine percent
perspiration."

     - Thomas Edison

E-mail: danielcjh@yahoo.com.sg
MSN: danstryder01@yahoo.com.sg
ICQ: 37878331
------------------------------------------------------------------------

Send instant messages to your online friends http://asia.messenger.yahoo.com 
-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist