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Developed by the Graffiti Research Lab a division of the Eyebeam R&D OpenLab, LED Throwies are an inexpensive way to add color to any ferromagnetic surface in your neighborhood. A Throwie consists of a lithium battery, a 10mm diffused LED and a rare-earth magnet taped together. Throw it up high and in quantity to impress your friends and city officials.

Click on this link to see the LED Throwies in action in NYC thanks to resitor and fi5e!

Step 1: Materials List

LED throwies consist of only a few inexpensive parts and can be made for ~$1.00 per Throwie. You can reference the parts list below or download the attached spreadsheet for more info on parts, part's numbers, vendors and application notes.

Part: 10mm Diffused LED
Vendor: HB Electronic Components
Average cost: $0.20 avg per LED
Notes: Cost reductions for larger quantities. Comes in red, blue, amber, white in both diffused and clear. Diffused works better than water clear for the Throwie application. HB has even created a Throwies packs page with deals on 10mm LEDs and lithium batteries!

Part: CR2032 3V Lithium Batteries
Vendor: CheapBatteries.com
Cost: $0.25 per battery
Notes: Cost reductions for larger quantities. With the 2032 Lithium batter, depending on the weather and the LED color, your Throwie should last around 1 -2 weeks.

Part: 1-inch wide Strapping Tape
Vendor: Your local hardware store
Cost: $2.00 for one roll
Notes: One roll will make many throwies

Part: 1/2" Dia x 1/8" Thick NdFeB Disc Magnet, Ni-Cu-Ni plated
Vendor:Amazing Magnets
Cost: $13.00 per 25 magnets
Notes: Cost reductions for larger quantities

Part: Conductive Epoxy
Vendor: Newark In One
Cost: $32.00
Notes: The epoxy is optional.
I have posted a how-to on making throwies with removable tabs where you can pull it out to turn the LED on and slide it back in to turn it bad off. It's not very hard to implement, and is quite useful for conserving battery power.<br/><br/>Here's the link: <a rel="nofollow" href="http://flickr.com/photos/everythingdigital/sets/72057594069888500/">http://flickr.com/photos/everythingdigital/sets/72057594069888500/</a><br/><br/>I'm also working on throwies that automatically turn on upon sticking to something and off when they are removed (as suggested above), and I have a few prototypes working but there are still some bugs to work out.<br/>
I have included your how-to on the <a rel="nofollow" href="http://graffitiresearchlab.com/?page_id=13">G.R.L. Throwies site</a> and in the upgrade section of the throwies instructables post. Thanks so much for the mods and looking forward to the next rev!<br/>
<p>Best quote: &quot;Throw it up high and in quantity to impress your friends and city officials.&quot;</p><p>How long do they last?</p>
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<p>hiiii</p>
Unknowable. Friends can be fickle, and city officials often disappear once installed.
<p>HA!</p>
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<p>not sure city officials would be that impressed.</p>
<strong>INTRODUCING:</strong><br /> <br /> Throwies on steroids - <br /> The <strong>LED ULTRIE!</strong><br /> <br /> 7 LEDs arranged in a ring<br />
<p>Hello! Do you have an instructable for this one? I want to apply something similar for a soft toy I'm making, just took my first steps on LED 'wiring' yesterday and your solution seems to fit what I had in mind... without entering into Arduino land _I'm not ready yet! Thank you :)</p>
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<p>so simple yet so powerful </p>
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fun with LED throwies
<p>This remains a phenomenally bad idea. Instructables should have nothing to do with promoting it, and neither should anyone else. Aside from the glib, &quot;impress . . . your city officials,&quot; which actually means something(i.e., demands allocations of resources, your tax dollars, to clean up someone else's mess, i.e., yours), it has &quot;pollution&quot; written all over. Tossing lithium batteries into the environment wildly-nilly, along with the rest of the ingredients of a &quot;Throwy,&quot;(it sounds so fun!) is the height of irresponsibility, the companies selling parts specifically for such should be sanctioned as well. I'm not opposed to childish behavior, which this is(it is not &quot;art&quot; on any level). But if you must, go throw toilet paper rolls over your friends' trees, or some such thing. Lithium-ion batteries are classified as &quot;hazardous waste,&quot; whether in your phone, portable drill, Tesla, or &quot;Throwy,&quot; and should be disposed of properly, without exception. I haven't even touched on the pollution associated with rare-earth magnets. Educate yourself, people! And grow up! Please! We can't go on like this forever.</p>
<p>Why don't you go ahead and explain the harm in this. inform me<br></p>
<p>well, he allready gave all information you need to determine the harm it does. for more information see my latest answer on your trolling comment (above)<br><br>(I know I risk feeding a troll here, but for the sake of clarification&hellip;)</p>
<p>Not trolling I just really don't see the harm and want to know.</p>
<p>either you're enormously lazy, live in a place where they block google &ndash; or I shall remain regarding you a troll. I'll make that my very last ration, as not to overfeed you:<br><br>as I allready stated, Schulyer gave you most information you need to thoroughly educate yourself on that topic. I added some and will leave you on your own with that.<br><br>so now my little troll, run free!</p>
<p>Still not a troll was just wondering and thanks kinda even though you still call me a troll. I'm just interested enough to ask questions about not interested enough on the topic to go do research on it.</p>
<p>better said than i could have. </p>
<p>Get off your cross we need the wood.</p>
Funny. Answer the question please.
<p>cool, except there is batteries just rotting in the environment. Also small batteries that are poisonous to small kids...</p>
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<p>is this instructable actually promoting the fabrication of &quot;throwies&quot; (as in &quot;throw-away&quot;) that consist of an LED and a Lithium Battery?<br><br>if so, I would like to line up with Shuyler, ask the author to educate himself concerning the ecological and social aspects of his proposal and publishing it on Instructables.com</p><p>I also agree that &quot;Instructables should have nothing to do with promoting it, and neither <br>should anyone else.&quot;</p>
<p>Are you serious it's a light bulb and a battery throw it around have a little fun and throw them away... What's the harm?</p>
I have little hope that facts will convince anyone who defends this practise.<br>but you asked what the harm is and I'll answer:<br><br>the harm is the battery<br><br>the hazardous ingredients of practically any type of Alkaline battery make it absolutely crucial to mindfully dispose of &mdash; not just throw them anywhere.<br>landfill should NOT be an option for disposal here.<br>closed substance cycle waste management defenitely is.<br><br>besides, throwing that kind of stuff is mere waste of material<br>(the value of wich unfortunately does not show in its price)<br>&mdash; economically and ecologically speaking.<br><br>(the fact that this type of button cell also contains lithium might also be a problem as lithium occures in such a concentration nowhere on this planet &mdash; except in man-made batteries.)<br><br>((and I would even regard it less of a problem if it WAS an actual light bulb, but it isn't. It's a piece of epoxy, sticking to a piece of acrylic, holding a little semiconductor&hellip;))
<p>Ok, it's hazardous, but what kind of damage would throwing a few outside do? I probably sound ignorant to you, but I really just want to find out how big of a problem it is in actual numbers and what it will do to environment (I'm guessing the damage it causes is to the environment).</p>
<p>I fear that the phrase of &quot;throwing a few&quot; massively plays down the problem, especially in this context here:<br></p><p><strong>1. instructables are usually made to spread an idea / a design</strong> and the rest does it unintendedly. that makes it completely incalculable how much Manganese dioxide will <br>end up in the environement. consequently it's impossible to give you numbers.<br></p><p><strong>2. &quot;throwies&quot;</strong> like these are designed for fast and cheap manufacturing. that includes, if not <strong>implicates</strong> <strong>rather</strong> <strong>high numbers</strong>. so it's highly likely that <strong>much more than &quot;a few&quot; </strong>will eventually end up in the wild. <br></p><p><strong>3. numbers</strong>. I can only repeat Schuylers advise to <strong>educate yourself on that</strong>. but generally speaking, <strong>every mol is too much</strong> (see: <a href="https://en.wikipedia.org/wiki/Manganese#Environmental_health_concerns" rel="nofollow"> https://en.wikipedia.org/wiki/Manganese#Environme...</a> )<br></p><p><strong>4. there is worse on the market</strong> than the usual chinese rust-away manganese oxide CR2032 &quot;Lithium Cells&quot;.</p><p><strong>Just don't ever throw any battery anywhere!</strong></p><p><strong>Ever.</strong></p>
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Bio: I made weapons for the British government for over thirty-five years. Now that I am retired, I have gotten involved in outfitting graffiti writers and ... More »
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