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estrin
Semi Newbie


Joined: 13 Nov 2007
Posts: 5

PostPosted: Tue Nov 13, 2007 3:39 pm    Post subject: No idea where to start! Reply with quote

I am doing a 21’’ high sculpture of a scientist holding an instrument with a DNA chip. This is art not science and the DNA chip is a stylized representation. It would be the size of a business card or less with small not too bright colored LEDs centered in about a 1.5” space in a grid formation. Most of them will be non-flashing yellow with red and other colors randomly flashing. Any electronics would have to be hidden in the base of the figure with battery or AC access.

I haven’t baked the sculpture and so I am fairly flexible so long as if fits within the proportions of my 21” sculpture. I have roughly a 2.5 “wide by 2” deep by 2” deep rectangular shape that will be held by two hands. It will look like he is holding out a rectangular box with the flashing LEDs centered on the top.

I need to have something that would give me 12-16 LEDS, that would be great. They have to be in a square configuration that I will imbed in the larger space. There is room for not worrying about taking the square space literally. It is important that only a few randomly placed LEDs flash while the yellow or white background is steady.

I need to kow what components to buy from Radio Shark or elsewhere. What resistors go whith what LEDS? What size batteries? What other components?

I don’t have the knowledge base to know what I need and how to put it together and would prefer a pre-made piece. Please avoid un explained acronyms and highly technical language because my training was in chemistry not electrical engineering.

Any other ideas?

Any help would be much appreciated!
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Turd
HG Ruler


Joined: 18 Aug 2007
Posts: 274
Location: Saskatchewan, Canada

PostPosted: Wed Nov 14, 2007 4:20 am    Post subject: Reply with quote

The easiest thing to do would be to get some flashing LEDs (they have the flashing circuit built into them) and power them through resistors Very Happy


eric
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estrin
Semi Newbie


Joined: 13 Nov 2007
Posts: 5

PostPosted: Wed Nov 14, 2007 9:49 am    Post subject: Reply with quote

Thank you four your reply!
How do I connect them to the non flasing LEDs?
How big a resister to I need for each flashing and non flashing LED?
What size battery could power about 16 LEDs?

Sorry for all the questions. I am a real newbie in this field.

Estrin
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Turd
HG Ruler


Joined: 18 Aug 2007
Posts: 274
Location: Saskatchewan, Canada

PostPosted: Thu Nov 15, 2007 6:36 am    Post subject: Reply with quote

You could run them in parallel with each it's own resistor.
For defused LEDs at 5 volts (red or yellow, flashing or not), I would use something like a 1K resistor (brown, black, red, gold).
How long do you what it to run?


eric
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Turd
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Joined: 18 Aug 2007
Posts: 274
Location: Saskatchewan, Canada

PostPosted: Thu Nov 15, 2007 6:46 am    Post subject: Reply with quote

Kinda like this:




eric
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estrin
Semi Newbie


Joined: 13 Nov 2007
Posts: 5

PostPosted: Thu Nov 15, 2007 8:33 am    Post subject: No idea where to start Reply with quote

Hi Eric,

Good information, thanks!

It should be set up to run so that it can be turned off and on easily after ten minutes or so.

What components do I need to set this up practically.?I don't even own a soldering iron yet.

Thanks,
Norm
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Project_Nightmare
HG Master


Joined: 12 Oct 2007
Posts: 119
Location: Gig Harbor, WA

PostPosted: Thu Nov 15, 2007 9:32 am    Post subject: Reply with quote

If you want to make it look nicer and do less soldering, I suggest using a resistor network Razz
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estrin
Semi Newbie


Joined: 13 Nov 2007
Posts: 5

PostPosted: Thu Nov 15, 2007 10:10 am    Post subject: Reply with quote

Sorry, I do not know the meaning of "resistor network". Sad
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Turd
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Joined: 18 Aug 2007
Posts: 274
Location: Saskatchewan, Canada

PostPosted: Fri Nov 16, 2007 5:24 am    Post subject: Reply with quote

These are resistor networks:
http://img.alibaba.com/photo/10282322/Resistor_Network.jpg
http://www.electronicplus.com/images/products/898-3-R22.jpg


eric
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estrin
Semi Newbie


Joined: 13 Nov 2007
Posts: 5

PostPosted: Fri Nov 16, 2007 3:12 pm    Post subject: No idea where to start Reply with quote

Thanks, Eric

I think I saw something like that at Radio Shack. I'll check it out!

Norm
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