Picture of LED Throwies
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!
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Step 1: Materials List

Picture of 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.
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Kirbsome!5 years ago

Throwies on steroids -

7 LEDs arranged in a ring
LED Ultrie.jpg

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 :)

so simple yet so powerful

I have great news, you are today's winner of the "I Made It" 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!

For winning you are receiving a 3 month pro-membership.

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.

Here's the link: http://flickr.com/photos/everythingdigital/sets/72057594069888500/

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.
Q-Branch (author)  everythingdigital9 years ago
I have included your how-to on the G.R.L. Throwies site and in the upgrade section of the throwies instructables post. Thanks so much for the mods and looking forward to the next rev!

Best quote: "Throw it up high and in quantity to impress your friends and city officials."

How long do they last?

Unknowable. Friends can be fickle, and city officials often disappear once installed.

not sure city officials would be that impressed.

fun with LED throwies
elliotnash26 days ago

This looks really cool. Guess I now know what I'll be doing before Christmas comes.


KIRAN PALK1 month ago

sir, its a really nice concept ..................... but i have one doubt ......that is

we require different batteries and magnet for each led?

elliotnash1 month ago

Looks really cool. I guess I should start preparing early for Chrismas now when I know of this awesome tutorial. :D

T0BY1 month ago
Absolutely brilliant!
WaqarH11 month ago

Thanks for your help. I was looking for a good blog where i can learn how to make a working LED throwie. I think it is one of the most useful websites on this topic.

Gym Flooring by http://rubbergymmatsuk.co.uk/gym-flooring.html

WaqarH11 month ago

It is the best webiste about led throwies. I have seen many websites but this website has shared ideas that i haven't found on any other webiste.


thermallyme2 months ago

Cool project!

Harrys62 months ago

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Harrys62 months ago

i want to say that your post is really nice i appreciate your work , Keep it up
guys, Thank you for sharing this post... http://rubbermattingexperts.co.uk/

GwyneddS2 months ago

I made one for my hair! It won't last long because it's so many LEDs, but it's fun for now. Just used electrical tape and a paperclip.

thowie clippy 2.jpgthrowie clippy.jpg
Harrys63 months ago

you so much for sharing this type of wonderful post. I really appreciate your
post much time. Buy our rubber matting & rubber flooring from http://rubberflooringsupplier.co.uk

Cool project! I've made also some basic reference posters to jumpstart your electronics. I hope this might help: :-)



HelenR5 months ago

I don't want to be a party-pooper, but those lithium batteries are lethal to children. So you might want to think carefully about where you put these things.

Conor M HelenR3 months ago

Hopefully there mums/dads are good parents and wont let them eat them

Snellingkorey6 months ago

My dog would love this, can you make it dog proof?

You should try involving it in heat-shrink tubing (that thing that you heat up and it shrinks to about half its size) but it won't stop it from eating the throwie, so be careful with that...

I agree with Monthrax, you can't really make this dog proof!

Can anything be truly dog proof? (I suppose you could put it in a small solid plastic box but it depends on the size of your dog.)

seybertooth4 months ago

it is in the tutorial on how to create an instructable

Ibwise4 months ago

will study this may be what I need to make dollhouse lights

nlewkowitz5 months ago

Cool concept.

my4pop15 months ago

Very nice liked. I hope you the further development.

smartmiltoys5 months ago

Amazing Led Throwies! I love it!

Thanks to author.

PatrickBishop5 months ago

This will be perfect for parties. Will try it soon :)

It's good that LED light can be put everywhere now

curly gurly6 months ago
This is so cool and creative!
Tbus7 months ago

This is so much fun! I'm studying a learn-at-home basic electronics course http://www.ciebookstore.com/basic-electronics-cour...
and this is a great supplement project. I'm going to tell my instructor to check this out and maybe he can include something like this for a future lab. Thanks Q-Branch!

ZombTech7 months ago

Made them, Threw them, had an awesome time :)

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