Persistence of Vision...this has some real cool potential for you smart guys.

[fertsy]

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I would build one but I am not smart enough to do that. I can just follow our wiki and barely make it by.


Thanks guys for all the cool wiki information...

[Beanbag109]

That is so cool! Now I need to leard to make PCB so I can make some of these!

[Night Owl]

Adafruit sells a version as a kit.

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I wanted to try it, but I don't ride my bike at night.

[therealbigjim]

Cool spinning element in a light display, I know we all have an old bike laying around. Use an MR16 or a 110  fan motor to spin the wheel.

[Timon]

Great place to start but what would it need to be used as a display feature?

1. An RGB version with full dimming.

2. Live data so you don't have to stop and reload.

3. Powered so no batteries.

I don't see a problem doing # 2 and 3. Slip rings or a rotating transformers will get power to the wheel. Live data can be sent wirelessly. An on board processor can convert the data from a matrix to moving strip.

The area that's going to get tricky will be getting the PWM for dimming the LEDs to not interfere with the rotational switching used to form the image. I did a rough calculation and based on a 40ms update and 64 segments would equal a 625us update rate. At that rate you'll really have to drive the LEDs hard to get good light output.

This could be an interesting project.


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[tbone321]

What exactly would be the purpose of dimming it and why does everything have to be RBG?  I mean in all honesty, it's pretty cool as it is and can't some things just be left as they are?

[PJNMCT]

What exactly would be the purpose of dimming it and why does everything have to be RBG?  I mean in all honesty, it's pretty cool as it is and can't some things just be left as they are?

Uh...let's see...uh...Nope!   

I mean even the cave men are doing it! 

[Night Owl]

Great place to start but what would it need to be used as a display feature?

1. An RGB version with full dimming.

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The quick way would be to build three units.  One with red leds, one with green, and one with blue.  Then you can work on the dimming.

[combustionmark]

I have always liked this, but it will eat up your universe quickly. I have always thought that you could have 255 programed patterns, then select what you want to show during the sequence.

Have fun

[csf]

This is really cool... I have scene similar stuff.

I wonder if this can be done with a SS pretty easily...

A SS only has 3 wires if I remember right. If you have 3 slip rings for the light and then need a channel to drive the motor to spin it.

[combustionmark]

If you spun a string of smart strings, you would wind up seeing the pwm pattern of the nodes.

With a 32 x 128 single color display, you would have 4096 pixels, one pixelnet universe. Throw in RGB, now you are looking at 3 pixelnet universes.

The only way I can see doing individual RGB
1 have preprogramed patterns
2 use an ethernet output card
3 use some other interface
4 send a video signal

Have fun