James Bond's cart locker

After a year of watching other people lock up carts anytime, I desided,I want one. Two hours later, James Bond's Cart Locker was born.

Step 1 Step 1: The Case

To Make your case to hold the electronics, Take a normal bic pen(shown in photo) and remove and save everything.

Comments

[Tobor 2.0]

Telescopic antenna? Wath is that and where can i find one

[RGalliath]

It is the type of attenna found on a radio remote control they can be found at hobby shops and other electronics stores

[white flame]

what is a cart?

[ry25920]

Shopping cart, buggy, see picture.

[Huntman00]

and how is is suppose to lock??? like the wheels or what

[evanwehrer]

nice picture

[bloke2022]

did you actually get this to work? if so how did you connect the ant.

[bloke2022]

I can't tell you the fancy reason why, but it doesn't work, yes I built it..l

[im_smoking_yeah]

i hate to be the bearer of bad news, i like the concept. However the design has many flaws. 1) There is no way that this is going to send out the 7800 mHz Signal. there must be some sort of magnetic wire wrapped around this. also where are the terminals on the headphone jack connected to?

[elpcavy21]

1 = many flaws? que?

[The Porsche Fan]

What?

[evanwehrer]

This will NOT work, its exactly the same as a wire going from the positive of the speaker to the ground, no matter where you solder the wires on the antenna! And before you try to say I didn't read it, I read it multiple times.

[berky93]

ok i hope my way works. - i took an old clock radio and cut off the radio antenna (it was a wire antenna, not the collapsible metal tubes) I took the headphone connector from an old mini ipod speaker and took off 2 of the 3 leads, because you only need one. I stripped both wires and connected them, then put some tape over it to hold them together, and a little more tape just to reinforce any weak areas. I took the antenna (it still has the rubber coating) and wrapped it around a piece of foam except for an inch or so at each end. then I took an old sd card case, cut a hole in it, and put everything inside and glued the headphone jack through the hole. I only had gorilla glue on hand so I hope it doesnt expand too much and not allow me to make the connection with my ipod. if so I need to scrape some off with a razor. its drying right now, I really hope this works (I'm the kind of person who used to carry a universal tv remote with him all the time to mess with people)

[MI6]

whats a cart locker?

[berky93]

some shopping carts have a special device that locks them if someone tries to remove them from a certain area, so that no one can steal them

[Jakeg]

how does this work? it makes no sense to me

[dombeef]

yea

[berky93]

well it recieves input from the headphone jack, which normally would be used in a speaker. but instead the electrical pulses are sent through the antenna to the cart.

[struckbyanarrow]

no heres what you do get a job as a radio dj and find a store with locking carts. see if they play music in the store /find what radio statioin it is then play the sound file or whatever it is on the station, mayhem in the whole store!. plus you get fired from the job for "accidentally' playing a weird song hehe so you dont have to quit from that crappy job.

[bikerbob2005]

my lexar LDP 600 has a built in tuneable radio transmitter ,it uses the headphones for ant as well a small telescoping ant that plugs in to the headphone jack
Is this the missing link for this build?

[struckbyanarrow]

?

[bikerbob2005]

the mp3 player has a fm transmiter built in and can play the file lol as well as transmit it .how does the cart get the signal?from a fm transmision?at a set ferq?with the signal modulated to that sound?

[jongscx]

Do this with an FM pen, so you'd have an excuse for an extendable antenna... THEN, use an FM modulator on an ipod in your pocket set to auto-repeat.

[Hands Without Shadows]

Reading all the other instructables on this and now knowing the theory, I can tell you that this instructable will do nothing but wreck your mp3 player. These shopping carts detect changing magnetic fields, and if the frequency is right they respond by locking up. An antenna cannot produce a better magnetic field than a piece of wire, and even then it is a horrible field. Playing the sound file (if that is even right, which I doubt) with regular headphones is more likely to work than what is shown in this instructable, because as we all know, speakers work by vibrating a diaphragm with a magnetic field.

[PyromaniacDaniel]

unless you mistakenly short circuit the jack this has no effect on the mp3 player.

[gimmelotsarobots]

You could put in an amp and coil. Real simple. Might need a bigger pen...

[ry25920]

haha, That would be one helluva coil. :)

[gimmelotsarobots]

I got around to calculating, that. You would need a few thousand feet!

[Patrik]

Actually, the signal is an electromagnetic field, kinda like a radio emitter except not using standard radio frequencies.

Based on some of the other instructables, the signal seems to be a 7.8kHz pulse, which is smack in the audible range of frequencies (or VLF - Very Low Frequency - in the EM spectrum), so it can easily be captured on an mp3 player.

All that's needed is some sort of antenna to transmit the signal. For a VLF signal like this, a telescopic antenna isn't ideal, but it's better than nothing. Remember - the store probably just uses a long wire buried around the edges of the parking lot. You may want to put a resistor in series with the antenna to avoid shorting the output amp.

Don't know whether a speaker would work better - speaker are designed to transduce an electrical signal to a sound signal, not to emit a strong electromagnetic field. A large induction coil such as used in some of the other instructables would work much better.

[technodude92]

speaker would not work b/c, as you stated, it's for transducing electrical signals into a sound signal. a sound wave is nothing like an electromagnetic wave. Sound waves have to do with pressure and the pressure of the air. EM waves have to do with magnetic fields. if you could unlock carts with sound, one could sing into a wheel (at the right pitch of course) to lock/unlock it

[mdmoose29]

ok.. did a little research.. guess there are some carts... that happen to lock the wheels if you take the cart to far away from the base station. This instructable basically either blocks the signal its trying to receive... or its magic... i guess.

[Estwald]

The opposite actually, the project creates the same signal that causes the wheels to lock up

[Zaen]

Ok I'm just going to say it. FAKE! I quote: "C:\Documents and Settings\Ryan Seals\My Documents\My Music\iTunes\iTunes Music\Use coil pen\Unknown Album\CART LOCKUP JOKE FILE.wav" Note the file name? I guess I should be saying JOKE. Beyond that, though, there is the simple fact that the current design wouldn't actually transmit anything. But nice try :) -Zaen

[Estwald]

See ry25920's Jun 14, 2008. 5:58 PM post for explaination of the joke name. It's a good idea to read all existing posts to see if what you want to post about has already been covered.

[mintyhippo90]

you obviously missed the entire point of this instructable. the reason is is called a cart lockup joke is because you use it as a JOKE to LOCK UP CARTS in your local target or wal-marts. not because the file itself is a joke.

[tippmannphreak]

C:\Documents and Settings\Ryan Seals\My Documents\My Music\iTunes\iTunes Music\Use coil pen\Unknown Album\CART LOCKUP JOKE FILE.wav Notice where it says JOKE FILE. This wont work. Please don't waste your time.

[ry25920]

I named it joke file because this instructable is used to play a joke on someone. I don't see a problem with naming a file that plays a joke on someone, "joke file". This will work, but it won't if you don't build it right.

[tippmannphreak]

well it IS the actual cart locker frequency, but I still wont believe you until you post a vid of SEVERAL different people getting their cart locked.

[pbpenguin5]

i think i'm going to just download the file later and play it through my ipod because i'm lazy =p

but, does the volume effect the magnetic field power such as higher sound level equals better chance or better radius of locking up?

[Notn4]

any1 got this working ???