cartnuke.jpg
board.jpg
IMG_0121.jpg
Ever noticed a painted yellow line in the parking lot around many supermarkets and retail stores? The magic yellow line emits a signal that causes carts to stop dead in their tracks, preventing carts from leaving the parking lot.

Now you can build your own portable yellow line-- with up to a 20 foot range. Need I say more? Hint: it works inside the store.

Disclaimer: This is not an easy project. It will require knowledge of circuits, soldering, social engineering, and a tiny bit of PIC microcontroller stuff. High power is involved, and if you mess up, you might get burned, caught on fire, or arrested-- most likely all three. Always use an appropriate amperage fuse to prevent a short from becoming a much bigger problem. This project is also fairly expensive. The parts will cost about 65 bucks. Batteries with some kick will run 20-30 bucks, and a single PCB is about 60 bucks. They get a lot cheaper if you buy multiples for your friends.

We would be thrilled to sell kits, and it would certainly make the components cheaper and easier to get, but frankly, we're a little worried about the possibility of civil action. We likewise recommend that no one else sells kits commercially.

In order to remain as anonymous as possible, we have utilized Tor. Tor is a network anonymizer which sends packets through a convoluted network to its destination in order to avoid tracing. We aren't lawyers, and who knows what lawyers are capable of these days, especially with things like the DMCA and recent controversy over data retention requirements likely to be instituted in the EU.

With the warnings out of the way... In the wise words of Norm Abram, "Be sure to read, understand, and follow all the safety rules that come with your power tools. Knowing how to use your power tools properly will greatly reduce the risk of personal injury. And remember this: there is no more important safety rule than to wear these-- safety glasses. Let's get started on today's project."
 
Remove these adsRemove these ads by Signing Up

Step 1: Background

The two major shopping cart theft prevention systems are called CAPS and the GS2. From our escapades, we have found the GS2 system is far more effective at actually stopping carts on smooth ground. It also has a longer range (!) and a more sophisticated locking and unlocking signal. Best of all, it can be reset remotely, meaning double the fun as you play "red light/green light" with unsuspecting customers.

The picture below is of the GS2 wheel, found only at your finer supermarkets.
1-40 of 219Next »
ewilhelm says: Apr 1, 2008. 9:40 AM
Plasmana in reply to ewilhelmNov 6, 2008. 4:21 PM
Cool!
gee says: Jul 2, 2007. 11:58 AM
Using the information posted here, I've created my own small/portable version. It's built with: - An Atmel ATTiny45 microcontroller. 8 pin DIP. - An IXYS IXDD414 FET driver, capable of driving +-14A peak. 8 pin DIP. - A series RLC tuned circuit at 7800Hz - a 1.5 ohm series resistor, a 1.0uF/100V capacitor (bipolar plastic), and a 390uH ferrite rod inductor (Coilcraft PCV0) - And additional bits; a 78L05 regulator for the AVR, a couple shottky diodes to protect the FET driver, a 9V battery clip, a couple large, low-ESR capacitors on the 9V input, pushbuttons, etc. Range is about 30 feet ;-) If you're building one of these, using a tuned LC circuit is the way to go - you can get large currents oscillating in the output inductor without requiring substantial average current draw from your battery; a rechargeable NiCD/NiMH 9V battery with a large capacitance across it is sufficient. Only thing is, a tuned circuit can generate upwards of 100V. So don't touch any of the output circuit bits when you've got the thing turned on. Also, grab a copy of LTSpice or other circuit simulator and model your output circuit - inductor, capacitor, series R, and don't forget to include include the R inherent in the FET driver and inductor. You'll want to set your Q high enough so that you get a good resonance going on, but not high enough so that the circuit takes forever to start up and decay. After all, you have to pass 250 baud on/off keying through the circuit. Happy mischief.
Cfichman in reply to geeMay 27, 2012. 7:08 AM
can I pay you to make me one? I'm not that technically inclined. whatever you think is fair.
iNate says: Dec 14, 2011. 3:23 PM
Vary funny but I can't try it don't have these here. Why do we need these? Why steal things its stupid and disrespectful. Get a job you bums! and a shopping cart
of all things that are stolen a shopping cart why.
brian2012 says: Sep 25, 2007. 4:16 PM
just wondering, will that set off those sensers by the doors that some items have in them
iNate in reply to brian2012Dec 14, 2011. 2:59 PM
magnets-no circuits just plain old magnets (those thick plastic stickers with a bar code on them, sorry no pictures)
If you take an old one and slide it over a magnet lots of times, in the same direction it will set of the alarm again (re magnetizes it) If you slide ti back and forth a lot of times it wont set of the alarm (demagnetizes it)
btop in reply to brian2012Apr 24, 2009. 10:34 AM
Fail.
highvoltageguy says: Oct 4, 2011. 8:18 AM
u know it always sez that past the damned line the trolley will stop i wonder what really happens?
ilpug says: Jul 24, 2011. 7:34 PM
heres an idea for concealment: if possible. build it into a purse! understandably it is only good for a girl, but who would expect a purse?
ilpug says: Jul 24, 2011. 7:32 PM
well, this has got to be the best prank i have seen. unfortunately i am to dumb to pull it off just yet. i will wait a few years and do this once i get my engineering degree, if its applicable by then.
Xellers says: Nov 13, 2009. 6:36 PM
This is very nicely done - but it would be hard to explain if someone caught you with a circuit board and a bunch of wires under your shirt...
LkArio says: Sep 20, 2009. 1:20 PM
You're awesome!!! I love this, LOL
Zerotology says: Jul 23, 2009. 1:02 PM
About the bike lock. Simple solution. When the bike is in motion, there's plenty of energy to charge a battery. Or, You could have a solar cell. All you'd need is enough current to trigger a transistor which disconnects from a magnet lock and the mechanism drops into place. Well, I guess the bike would be in motion so it would have to act upon centrifugal energy to lock.
savagesteve says: Jul 6, 2007. 1:44 PM
I like the Aldi Grocery store method. It uses simple human psychology. The carts are chained together. You stick a quarter in a special slot on the cart to release it. When you are finished with the cart, you re-attach the chain and it releases the quarter. Okay, 25c doesn't sound like much money, but there's an innate human need to get that quarter back! Shopping cart thievery is just sad. It makes about as much sense as stealing a gas pump handle.
Wolf Seril in reply to savagesteveJul 21, 2009. 9:54 PM
I like the Jewel (albertsons/cub/sav-on/ect) method. Don't expect all of your customers to rob you.
_soapy_ in reply to savagesteveApr 26, 2009. 3:55 AM
In the UK it's a Pound, and in Europe it's a Euro. I guess everything is cheaper in the USA! It did create a huge market for little keychain coin-sized tokens for them, though. I was thinking of selling bags of the right sized washers for £1 a hundred.
surrealdreams in reply to _soapy_Jun 7, 2011. 6:20 AM
To be fair, nobody here carries coins larger than a quarter. We have $.50 and $1.00 coins... but they never caught on. If they were common I'm sure our cart lock/unlock mechanisms would require a bit more money.
scoopin in reply to savagesteveJul 7, 2007. 1:50 AM
thats if one uses that pump handle to throw at some doumbass that just cut you off the road...........
willwade says: Jul 2, 2007. 9:07 AM
If these pictures don't make a security guard want to call the counter terrorism unit I don't think anything will.. i.e. does this not look highly suspect in the current day of people wrapping themselves in dodgy looking wire and detonators? All you need to do to finish the look is make sure your pulling this stunt with some fertiliser in your trolley and hey presto the next day you find yourself in Guantanamo with a orange jumpsuit.. God forbid if you mention Allah..
Wargasm in reply to willwadeJun 27, 2009. 8:21 PM
I guess since all mighty Obama closed Guantanamo, we shouldn't have to worry about that now. ;-)
oxidase says: Jul 6, 2007. 10:59 PM
What exactly does it do, i mean i didnt read the hole thing. Is it just a button that you push and when your at 10-20 ft away the carts stop moving?
JamesRPatrick in reply to oxidaseJul 7, 2007. 11:38 AM
When you bring it to your computer at home, you press a button and it displays the whole instructable for you to read.
_soapy_ in reply to JamesRPatrickApr 26, 2009. 3:48 AM
A+
Digital_Anarchy says: Aug 8, 2008. 7:28 AM
How much harder would it be to make a massive version, that could take out every trolley in the store? perhaps in a vehicle in the car park.
_soapy_ in reply to Digital_AnarchyApr 26, 2009. 3:32 AM
If you ran a coil around the entire shop (or even the entire mall!) then that would work. Might need a more powerful system, though.
scoopin says: Jul 2, 2007. 10:50 PM
thats funny i just was going to do this same thing. i snagged a wheel off a shopping cart then i got the idea of recording the data on the track outside. then lock everyons cart in the store . this is one of the recivers in the wheel.
DSC00013.JPGDSC00016.JPGDSC00017.JPG
scoopin in reply to scoopinApr 6, 2008. 8:51 PM
has anyone tested these yet?..
chuck norris in reply to scoopinFeb 26, 2009. 8:53 PM
If you look at the date of this post, you'll find that not many have tried this. Sorry to break the bad news. But, I think the reason for this is...well, how many people can actually disassemble a shopping cart, remove the wheel (being sure that they got the one with this device in it), and then walk away like nothing just happened without being caught? But you somehow managed to do this and for that I must say that you've got quite a bit of skill, man.
untitled23.bmp
_soapy_ in reply to chuck norrisApr 26, 2009. 3:31 AM
This is true. If only they got taken a few blocks then dumped like the other ones, then they'd be easy to grab. Oh, wait.... This is a fairly in depth project, certainly a day's worth of work even for me, and I've got all the bits to hand. I'd try it, but we don't have this system anywhere in the UK as far as I know. We just have those grooved mats that jam the wheels, which you get past by pushing the trolley at a slight angle rather than straight.
MeesterO says: Apr 1, 2008. 3:45 PM
Don't forget to remove your ATM/CREDIT cards from your wallet or purse during testing and carry cash during the prank...otherwise u will have to go get replacements after you demagnetize them!
btop in reply to MeesterOApr 24, 2009. 10:33 AM
Fail.
splapped says: Jul 8, 2008. 8:34 AM
I sell all of those parts. I could get you them cheaper too, just talk to ari at reliantelectronics.com
Opcom in reply to splappedApr 23, 2009. 7:10 PM
Oh great, now we got a disty sales channel going. (smile) Are my employer's semiconductors on your line card? ooh this is thin ice.. I only can see the front side of the line card on your web page. Funny how the recorded 8KHz signal (the ogg file) sounds like a squeaky cart wheel.
Opcom says: Apr 23, 2009. 6:48 PM
Ethernet cable is a small guage, but the conductors can be doubled or tripled up. Makes for nice slick coils.
alexhalford says: Apr 4, 2008. 6:22 AM
can someone please explain the difference between an NPN transistor, a PNP transistor and a FET / MOSFET. Thanks
merseyless in reply to alexhalfordApr 4, 2008. 10:24 PM
i think NPN transistors let current through when electrisity is flowing into base. PNP transistors let current through when there is no electrisity flowing into base. I could be wrong though
alexhalford in reply to merseylessApr 11, 2008. 5:44 AM
thanks, what about FET / MOSFET though???
askvictor in reply to alexhalfordNov 5, 2008. 5:48 PM
FETs let current through the Drain-Source channel depending on how much voltage is between the Gate and the Source. They are also know as unijunction transistors, as opposed to NPN/PNP trannies which are Bijunction transistors. I think MOSFETs are good at handling high currents.
sephiroth9393 in reply to alexhalfordAug 7, 2008. 11:43 AM
Field Effect Transistor and Metal Oxide Semiconductor Field Effect Transistor.
1-40 of 219Next »
Pro

Get More Out of Instructables

Already have an Account?

close

PDF Downloads
As a Pro member, you will gain access to download any Instructable in the PDF format. You also have the ability to customize your PDF download.

Upgrade to Pro today!