self-powered using inductors?

[wiRe]

just an stupid idea: may it be possible to get the power from several
inductors placed on the board, passing strong magnets will change the
magnetic field and induct some current (the frequence of the arising
alternating voltage also represents the wheel speed). using low-power-
leds and attiny-technology should reduce current consumption to a
minimum. i'am not able to express this as an physical equation, but
maybe somebody else? but i guess we don't get enough power to light
too many leds this way.

[Nikolai Kvassov]

Hi!
Factory-made wheel hubs with embedded DC generators exists, actually.
You haven't build it by yourself. But accu's will be needed anyway.
Thanks for your interest.

[Casainho]

Hello :-)

To say the true, I think I never taught correctly in current used.
Since we are using 64 LED per radial line, no more than 64 LED are
turned on at time. Maybe the current needed is small, maybe we can use
the AAA NiMH, which are small in my opinion.

----

I am being far away from this project, but I am working a lot on the
Lyre project*.

Since I am experiencing with ARM and USB, I was thinking maybe in make
the system with an ARM7, for have powerful to work as USB device mass
storage. On PC we would simple copy the image files to the 1MB
DataFlash. ARM would then read each files and show them on POV.

* http://www.rockbox.org/twiki/bin/view/Main/LyreProject

[Casainho]

Or maybe we can use the "0.7V tinyAVR" ATtiny43U with just one NiMh
AAA cell. The problem is that this tiny MCU don't have much memory and
then we can't make any USB device nor use any kind of file system like
FAT32.

But it should be enough for a simple pov.

[Casainho]

Using ATtiny43U, we could make the mini pov version as I did here:

http://code.google.com/p/bicycleledpov/source/browse/trunk/hardware/firmware/minipov?r=331

Ah, and I even did one mini pov using ATtiny24 + 2 NiMh AAA cells,
using discrete red LED... it worked nicely but the LED were cheap and
didn't gave much light :-(