loading
Picture of Auto On/Off LED Throwie
IMG_0547.JPG
IMG_0549.JPG
This is my version of the LED Throwie. The design isn't mine, this is just my mod of it. In the original design, the LED Throwie is on from the moment you put it together. This can be annoying if you're planning to make tons of these, or if you want to make them ahead of time but not have the battery run out. Someone has already posted a mod that adds an on/off tab to the throwie, however I've taken it one step further: in this design the throwie automatically turns on when it sticks to something, and turns off as soon as you remove it! It's just as simple to make as normal throwies, and doesn't require any extra materials either! These also work great as simple LED pinch lights. Credit goes to everythingdigital for the idea (it was mentioned in a comment), but the implementation is mine.

I'll point out that though this instructable may seem long or complicated at first, it's only because I wanted to make sure it was well documented. It is actually VERY easy and VERY quick to do. Making these throwies should be just as easy, and take no longer than the original design. Once you've done one and you understand how it works, you'll be whipping these out in no time.

From the original throwie:
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.
 
Remove these adsRemove these ads by Signing Up
LeithG28 days ago
Thanks for the design revision it will be usefull, i did a price up yesterday (4th july 2015) I priced it in at about 40 cents australian to make a throwie
But thay was buying the 3v batteries from aliexpess at 21USd for 250 of them, 600 5mm LED (100 RED 100BLUE 100 GREEN 100PINK 100 YELLOW 100PURPLE) 20 AUD and 200 magnets for 20aud so excluding the wastage which i will just use for other projects total was 75 aud for 200 throwies (plus tape so at best 80) so its come down a fair bit now in price to make these bad boys if you buy online.
Wee Heavy2 years ago
Could this version be made without the magnet!
vborkar4 years ago
DUDE WHOEVER U R U R JST TOOOOOOOOOOOO GOOOOOOOODDD
COZ THE NORMAL LED THROWIES REMAINS ON SO THE BATTERY DRAINS FASTER U R THE BESY GUY IN HTE WORLD!!!!!!!!!!!!!!!!!!!!!
U JUST ROCK
fkhalsa (author)  vborkar4 years ago
Haha, thanks dude!
I'll try and get some better pics up soon.
THESE PICS R GOOD
U ROCKX
no_light3 years ago
you can use electrical tape rite? or like duct tape?
mg99903 years ago
do you know how long they last when they are on with the battery you are using? This is a really brilliant idea because I always thought it was dumb that throwies never turn off :/
lhong43 years ago
Does the magnet stick onto the battery by itself? if it could, I am thinking of just taping one of the legs to the battery then leave the other hanging slightly above. When I am ready to light it up, I just need to push the hanging leg down with the magnet. I don't plan to really throw it around so there's no worry of having the magnet coming apart midair.
You should defiently use the macro setting on you camera, it's the flower icon...
fkhalsa (author)  freakyqwerty3 years ago
As I noted in another comment, the only camera available to me at the time was my iPhone 3G, which does not have a macro setting (or else I would have used it).

I plan to retake all the images for this instructable soon, using a much nicer camera, that is capable of macro photography.

Thanks for commenting though!
Good 'ible anyway :P
fnawaz4 years ago
good,,,,,,,,,,,,,,,,,,,,,,,,,
fkhalsa (author)  fnawaz4 years ago
Thanks!
You know somebody loves your project if they congratulate in all CAPS.

Excellent instructable from an excellent user. Great job.
fkhalsa (author)  ForgerOfPie4 years ago
Thanks a lot!
gumbylove4 years ago
Ikea sells a pack of 8 CV2032 batteries for .99 cents. Way cheaper than the $6 brand name pack of 2.
It's Ikea! What else would you expect? :)
fkhalsa (author)  gumbylove4 years ago
Cool, thanks!
I found some cheap ones online, on Amazon.com and eBay as well.
zazenergy4 years ago
Looks cool! Any chance you can include clearer photos?
fkhalsa (author)  zazenergy4 years ago
Thanks!
Sorry about that, all I've got right now is my iPhone 3G, but as soon as I get access to a better camera I'll put in better pics. Hope they're at least usable.