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.
<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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