That would be a cool way of making an animated character. Another
way could be to keep the mirrors the same angle (you can get those
faceted ones from laser printers) and move the laser up and down
with a stepper. You'd need to adjust the timings as the reflection angle
changed so that pixels were equi-distant

> What about mounting eight small mirrors; one on each face of an
> octagonal piece of wood rotated by a small motor. One face is
> perpendicular to the floor and each successive face is tilted
> upwards slightly.  An optical sensor establishes the position of
> each mirrored face.
>
> Then as the block spins you need only modulate the laser on and
> off.  As face number one rotates into view, you display the
> bottom row of 'pixels'.  Then as the second face comes into view
> you send the second row.  Because the second mirror is tilted
> upwards a bit, these 'dots' form the second row.  Etcetera.
>
> I don't recall where, but I've seen a few articles and/or web
> pages on this approach.
>
> Andrew
>
>
>
>
>
>
>
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>
> ---- On    , Greg Miller (gmiller@GREGMILLER.NET) wrote:
>
> >         I thought it'd be fun to use a mirror to scan a laser
> across a
> > wall for a display.  I've had several ideas for how to make
> the mirror
> > scan the beam across and up and down, but they all seem a bit
> beyond
> > my mechanical abilities.  The latest idea I've come up with is
> to put
> > four permanent magnets on the back of a mirror, and a coil
> behind each
> > magnet to push/pull the mirror which is mounted on a pivot in
> the
> > center.  Will that actually work?  Is there an easier way?
> >
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