Coke Vending Machine Hack

Coke vending machines are everywhere. They’re getting more and more like regular computers with LEDs that show little “ICE COLD” messages and whatnot. Well, there’s a lot more to those little builtin computers than you may think. Included in the lowlevel operating system that these babies run on is an actual debug menu that gives you access to all sorts of machine information and possibly gives you free cokes in older machines.

WHICH MACHINES WORK?
There’s a very strict list of vending machines that have the debug menu. First off, they’re all COCACOLA product vending machines. This means the giant, unmissable picture on the front must show any of the following: Coke, Dasani Water, Barq’s Root Beer, Vanilla Coke, Cherry Coke, Sprite, Evlan water, Fanta, Fresca, Frutopia, HiC, Sprite Remix, Mad River, Mello Yello, Minute Maid, Nestea, Odwalla, Mr. Pibb/Pibb Xtra, Planet Java, Power Ade, Seagram’s Ginger Ale, Simply Orange, Sparkletts, or Tab. Of course anything Diet or Caffeine free works too.
The machine must have an LED screen. Some of the older ones just allow the LED to be set to a price amount and won’t have the debug menu. You’re safer if the little LED is telling you something. Usually it will scroll a little message like “Ice Cold Cokes”. Newer machines are more likely candidates.

ACCESSING THE MENU
To enter the menu, there’s a button combination. HERE’S THE ONLY THING YOU HAVE TO REALLY REMEMBER:

4231

The buttons are numbered depending on how they are positioned. They will either be vertical more likely, or in horizontal rows of 4 buttons per row. If it is vertical, the first button is #1, the one below it is #2, and so forth. If the buttons are in horizontal rows, the first button is #1, and the one to the right of it is #2. The numbers work like a type writer after that. In rows of 4, the first button of row 2 will be button #5. So, to review, getting in to the debug menu looks like this:

COKE MACHINE::::::
$1.00

Coke Hit this button last
Coke Hit this button second
Diet Coke Hit this button third
Sprite Hit this button first
And so on

Some text should show up on the LED probably the word “Error”, we’ll explain what it means next sections. If nothing happens, your machine doesn’t have the debug menu.

NAVIGATION
To navigate from option to option What they are is next section, remember the numberings we gave the buttons. They work as follows:
Button 1 Exit/Back
Button 2 Up
Button 3 Down
Button 4 Select

OPTIONS
Depending on the age of the machine, you will get a varying amount of default options available.
On older machines: SALE, VER, EROR, and RTN
On newer machines: CASH, SALE, EROR, and RTN

CASH Machine Earnings Display
The CASH option will display how much money is in the machine currently. It generally takes a second or two to load. From here, you can scroll up and down through 12 or 16 different options, depending on the machine age. These other options display how much money was spent on each individual item, classified through its button or slot, as I like to call it number.
A neat side note about the slot numbers is that there are more slot numbers than there are actual slot, so usually the last 4 buttons contain zero money. This could be so that the same OS could be used on bigger machines, but the newer machines have even more slot numbers.

SALE Total Sale Count
The SALE option displays how many drinks have been sold out of the machine. This tends to be cumulative, but not on all machines. The stock guy is probably supposed to reset this each time he restocks. Also, this has the same suboptions as the CASH option, where you can scroll up and down and see how many drinks have been sold from each slot.

VER System/Machine Version?
This option will cause a large alphanumeric string to scroll across the LCD. The number looks very much like a serial number, but doesn’t vary from machine to machine. It is most likely the OS or machine version number, but of the older machines that have the option, I haven’t seen one that doesn’t have the same number.

EROR Error Log
There are 8 different types of errors COLJ Column Jams, VEnd Vend Mechanism, door Door Switch, sels Select Switch, CHAR Changer Errors, acce Acceptor Errors, StS Spacetosales errors, and bVal Bill Validators. The separate types and actual errors are useless, as you assumably can’t get inside the machine, BUT! you can clear the errors. Hold the enter Number 4 button down for about 2 seconds, and it should clear the error.

RTN Return
This is simply the return option. Selecting this will exit the debug menu. On newer machines, pressing the BACK button at the main menu will not exit, and RTN must be selected.
A side note: The menu can also be exited by pressing the coin return button.

EXTRAS
By holding in the coin return button and not releasing, on the newer “bigbutton” machines, this will display the internal temperature in Fahrenheit, as in “42F”.

**Update**
There are many more menu options that are only accessible if they’ve either been enabled from the computer inside the machine, or on the internal computer behind the door Probably not feasible for you to access.

CPO Coin Payout Mode
You can can dump coins from the coin mechanism, and the various menu options allow you to choose which type of coins Nickels, dimes, etc. are dumped.

tVFL Tube Fill Mode
This is useless to you. This allows you to load coins into the coin tubes, which you can’t do from the outside.

TEST Test Routines
This allows you to test the following various routines:
SE Allows you to test the buttons. Will give you number
of button when you press it
SP Soldout paddle test. Not quite sure, most likely internal function.
Su Soldout switch test. Same as paddle.
CO Motor test. Will run various column motors.
Cn Coin test. Put in a coin and it will tell you what kind of
coin it is.
nA Note acceptor test. Same as Cn, but for bills.
dSP Display test. Will illuminate various LEDs.
vErS Rattles off version number.

RELY Relay test
This tests the relay electronic control of various parts. Do not do, as it will cause damage if various internal parts are not unplugged before usage.

PASS Password
This is not normally accessible, but allows you to change the menu password from the 4231. Whoo!

PrIC Price Setting
Used to set the price for a drink. Not sure how to work it, but it seems simple enough.

StOS Spacetosales routine
Lets you change the STS routine and other options. This means that various buttons will all mean the same thing, i.e. the 6 coke buttons don’t actually vend from 6 different columns, but vend from one changing when one runs out of course.

COn Machine Configuration/Permissions
This is the machine config menu that decides what of these options you are allowed to access through the outside panel. This is probably only accessible with the door open. I won’t go into detail, but I’ll list the Config numbers and what each do: C1 sets price menu on, C2 sets special manufacturer options on, C3 disables the “ICE COLD COKE” message. C4 is autoviewing of menu when door is opened, C5 is door switch status, C6 is mysteriously reserved for “future use”, C7 determines whether your money credit stays in for 5 minutes or indefinitely, C8 is Force Vend, C9 allows multiple vends without putting in more money i.e put in a 5 and get 3 cokes and then your change, and C10 is Escrow Inhibit.

CCoC Correct Change Only Control
Adjusts Correct Change only rule to your liking.

TIME Time Adjustment
Allows you to set the machine’s local time.

LANG Language Selection
Not sure how many languages are supported, but there are apparently more than just English.

Source