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.
<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>
<p>so simple yet so powerful </p>
I have great news, you are today&#39;s winner of the &quot;I Made It&quot; Challenge for the month of june. Thank you so much for being a part of the instructables community and encouraging authors to post more projects!<br /> <br /> For winning you are receiving a 3 month pro-membership.<br /> <br /> http://www.instructables.com/community/June-is-I-Made-It-Challenge-Month-Win-a-Pro-Mem/
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>
Unknowable. Friends can be fickle, and city officials often disappear once installed.
<p>not sure city officials would be that impressed.</p>
fun with LED throwies
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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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