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Step 2: Test the LED

Test your LED to determine color, brightness and functionality. Pinch the LED legs, or leads, to the battery terminals. The longer LED lead, called the anode, should be touching the positive terminal (+) of the battery and the shorter LED lead, called the cathode, should be touching the negative terminal (-) of the battery.

Note that the positive terminal on the battery has a larger contact surface than the negative terminal. The positive terminal extends around the sides of the battery. Don't let the cathode lead of the LED accidentally touch the positive terminal of the battery. This will create a short and cause the LED to function improperly.

For more information on LEDs click here.
For more information on batteries click here.
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>HA!</p>
<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>
<p>so simple yet so powerful </p>
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fun with LED throwies
<p>Will be amazing for party... Maybe next NYE.</p>
<p>wow that is cool ;)</p>
<p>Thanks for that, very helpful.</p>
<p>Letting the &quot;wrong&quot; LED lead touch the battery won't cause a short or <br>damage either component. LEDs are diodes and only function one way <br>round. It won't harm the LED to be reverse-biased, and indeed it's <br>designed to be connected this way in larger circuits. Lithium batteries <br>shouldn't present a disposal hazard when used in this way, as they'll be<br> fully discharged when they do reach landfill.<br><br>Better than chucking them once they've run down, why not &quot;catch&quot; them with a stick/net/string, and re-build them with a new battery?</p>
<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>Thats +1 Please don't pollute our earth for fun, that is total ignorance !!! </p>
<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>dude, this was posted 10 years ago. </p>
<p>Do you have to use the 10mm Diffused LED lights, or can you use 5mm or 3mm</p>
<p>Any LEDs will work. Just 10mm look the best.</p>
<p>Wow, hard to believe this was posted 10 years ago.</p>
<p>that is cool</p>
<p>It's great!<br>My nephew has long enjoyed doing it<br>Thank you very much for sharing. Keep going</p>
<p>Your LED throwies link video is broken </p>
<p>I appreciate the very informative article.</p><p>I have several 3mm LEDs that would work with the 3V CR2032 batteries. However, I know of some smaller 3V lithium cell batteries and would rather use the tiniest ones possible. I'm going to use them for something I've been working on and want the battery to be as invisible as possible.</p><p>If you please, what is the smallest sized battery you know of that would work for these? Also, I wouldn't mind if they were a little dimmer, so ought I to use less than 3V? Thank you very much.</p>
<p>Probably hearing aid batteries.</p>
<p>AWW</p>
<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>
<p>Amazing!!!</p>
<p>Great project for Christmas, wish I had found it sooner.</p>
<p>I like the luminous effect of these throwies. But i'd be afraid that some of these throwies finish in the sewage waters and each watch-battery would pollute amonts of water.</p>
<p>agree</p>
<p>So easy &amp; fun! I used packaging tape to secure the LED to the batteries and hot glued the magnet to the tape. Looking forward to making some Maker-Art throughout Philadelphia :p</p>
<p>Cool stuff!</p>
<p>this is an amazing decoration </p>
<p>My kids also love these - thanks!</p>
<p>Anybody else old enough to remember a Movie called Twister? Wouldn't these things Take what they did in that movie from Science Fiction to science Fact? fy a drone carring a payload of these things or similar and dump them then track the light paths?</p>
Tesla used radio to power his electric car. Surely sqq

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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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