Comments on: 72 LED persistence of vision globe

By: Yokk

Yokk — Wed, 23 Jun 2010 12:52:46 +0000

If i wanna do this project by using FPGA ,,,,, Can i do it ??

By: netmind

netmind — Fri, 23 Apr 2010 13:16:39 +0000

Sorry
Do you thing is possible to make the same whit a pic16f876 or pic16f690

By: netmind

netmind — Fri, 23 Apr 2010 13:16:14 +0000

Do you thing is possible to make the same whit a pic16f876 or pic16f690

By: Csaba Bleuer

Csaba Bleuer — Thu, 28 Jan 2010 17:20:34 +0000

Hi,

What is the rpm? I am also curious about shifting the LED columns caused by multiplexing…

I have a similar design. My rpm is 25 and I use a 20W fan motor. :-)
http://hackedgadgets.com/2009/07/06/spinning-led-display-using-fan-motor/

By: fre

fre — Fri, 16 Oct 2009 20:38:48 +0000

the audiojack power line is so clever, why havnt anyone thought of that before? i wonder how long it will last though. but as said in the article, a cap might be a good idea, especially when the audio jack starts to get worn.

By: Amos

Amos — Fri, 16 Oct 2009 16:41:40 +0000

That’s a mighty fine project there, Ben!

My $0.02 worth of concerns/questions:

1. Reed switch will quickly become magnetized and always “on”. Expect to replace it quite soon. Maybe an optical solution is in order? (Look for the HaD article about scavenging old ball-mice.)

2. Glad to hear WD40 isn’t your perm. lube solution. I third Andrew and _matt’s suggestions of graphite/petrolatum/silicone.

3. Any plans on sending real-time graphics data over the third pin of the phono plug?

4. You might think about using thumbnails for those 2 MP images (for those with slower connections/PCs).

By: strider_mt2k

strider_mt2k — Fri, 16 Oct 2009 14:11:34 +0000

That is a clever use of an audio jack!

Well done!

By: db

db — Fri, 16 Oct 2009 13:42:38 +0000

Somebody port Missle Command to this thing, stat!

Seriously, übar-sweet project.
The gaming posibilities are insane-cool.

By: TomF

TomF — Fri, 16 Oct 2009 13:00:52 +0000

I absolutely love this. It shows really well what can be achieved using brains instead of money.

I was surprised to see that a simple reed contact was fast enough for synchronisation. I thought a hall sensor was mandatory.

Now, were is this old CD container…

By: Lucas

Lucas — Fri, 16 Oct 2009 11:32:00 +0000

Great build!
Just curious: Why didn’t you use the 3rd pin of the PC fan as the revolving indicator? It would have saved you 2 extra parts.

By: Ben Surtees

Ben Surtees — Fri, 16 Oct 2009 09:08:03 +0000

Yeah, agree about WD40, but I had it around. when I am working on a finished item, I will use something more suitable.

And yeah the motor does get quite warm

By: _matt

_matt — Fri, 16 Oct 2009 08:51:58 +0000

I’m with Andrew, WD-40 is a temporary solution when there’s no actual lube around. His suggestions work, and so does silicon lube as well, it’s sold as “household” everything lube.

That is clever though, the whole thing is.
Won’t the fan motor heat up quite a bit with no moving air?

By: cleopix

cleopix — Fri, 16 Oct 2009 08:40:32 +0000

Don’t know what is that))

By: Zaphod

Zaphod — Fri, 16 Oct 2009 07:55:42 +0000

Nice pictures man. Everyone wants to build one now, I’m heading over to google code to download the rest. http://code.google.com/p/povglobe/ .

By: zoidberg

zoidberg — Thu, 15 Oct 2009 23:55:30 +0000

That’s fantastic!

Just a thought – what if you put a row of LEDs on the inside of the ring, so that as they pass through the back of the globe, they produce some kind of 3D effect? Wonder if that’ll work…