Vending Machine Logic?

shwetha_siddu · 05-07-2008, 05:10 AM

Dear All,

I am designing code for Vending Machine..could anybody know the logic
or just give me links where i will find the logic??

thanks in Advance

zacs7 · 05-07-2008, 05:12 AM

Other than general knowledge and intuition what is there to know?

You put in $, you select an item, the item is despensed and you get your change back. Have you never used a vending machine in your life?

mike_g · 05-07-2008, 06:03 AM

If its got those curly thing that the food comes out of you want to make sure that they don't rotate too much so that they drop two thin items in one go. You also need to make sure that they drop one item - packets of crisps often get stuck. Maybe you could use lasers to scan how fat the object is and rotate accordingly. That would rule.

NeonBlack · 05-07-2008, 07:38 PM

It's fairly straightforward. Here's some pseudo code:

Code:

if (someone puts money into the machine)
{
    prompt snack selection
    make sure snack is not dispensed
    if (the person hits the money return button)
        do nothing
}

whiteflags · 05-07-2008, 10:32 PM

Quote:

Originally Posted by NeonBlack

It's fairly straightforward. Here's some pseudo code:

Code:

if (someone puts money into the machine)
{
    prompt snack selection
    make sure snack is not dispensed
    if (the person hits the money return button)
        do nothing
}

When exactly do I get the snack?

jEssYcAt · 05-07-2008, 10:55 PM

It ate your money, too? You'll just have to fill out one of those little refund cards. Now where are they...?

**Bubba** · 05-07-2008, 11:12 PM

A vending machine would have a significant amount of code to deal with the DBA (dollar bill acceptor), the coin acceptor, the button inputs, and the machinery to actually dispense the product.

I would say there is a hefty amount of device code involved.

**Thantos** · 05-07-2008, 11:20 PM

Quote:

Originally Posted by Bubba

A vending machine would have a significant amount of code to deal with the DBA (dollar bill acceptor), the coin acceptor, the button inputs, and the machinery to actually dispense the product.

I would say there is a hefty amount of device code involved.

Well the coin acceptor was a mechnical action before, not sure if that is still 100% true though. I would image that both the bill and coin devices do the processing on board and use signaling to the vending machine logic.

Buttons mainly just have to be debounced and for dispensing it merely requires turning a motor (for screw based ones) or opening a latch (for drop ones like soda machines).

Vending machines are used as examples a lot when dealing with Finite State Machines and the core logic really isn't that difficult.

It really comes down to keeping track of how much money has been deposited and then when a selection is made seeing if enough money has been deposited.

master5001 · 05-08-2008, 12:39 AM

Example:

Code:

switch(user.input)
{
    case A_1:
       eject(PEPSI);
       break;
    case A_2:
       eject(SPRITE);
       break;
    case A_3:
       eject(DR_PEPPER);
       break;

    // etc.
}

Good luck, friend.

master5001 · 05-08-2008, 12:41 AM

(I would also like to put my $5 on the fact that this is a homework and this gentleman was not hired to write the logic for someone's machine).

blue.machine · 04-07-2009, 03:33 AM

Not really, but i can give you some tips in finding some logic about your programming project well why not to try to search in some open source site about programming i think you can get their some little information about your problem...

_________________
Vending Machine

05-07-2008, 05:10 AM	#1
shwetha_siddu Registered User Join Date: Apr 2008 Posts: 83	Vending Machine Logic? Dear All, I am designing code for Vending Machine..could anybody know the logic or just give me links where i will find the logic?? thanks in Advance
shwetha_siddu is offline

05-07-2008, 05:12 AM	#2
zacs7 Woof, woof! Join Date: Mar 2007 Location: Australia Posts: 3,139	Other than general knowledge and intuition what is there to know? You put in $, you select an item, the item is despensed and you get your change back. Have you never used a vending machine in your life? __________________ "I.T. gets the chicky-babes" - M. Kelly bakefile \| vim
zacs7 is offline

05-07-2008, 06:03 AM	#3
mike_g Wheres the lesbians? Join Date: Oct 2006 Location: UK Posts: 1,219	If its got those curly thing that the food comes out of you want to make sure that they don't rotate too much so that they drop two thin items in one go. You also need to make sure that they drop one item - packets of crisps often get stuck. Maybe you could use lasers to scan how fat the object is and rotate accordingly. That would rule.
mike_g is offline

05-07-2008, 07:38 PM	#4
NeonBlack Registered User Join Date: Nov 2007 Posts: 171	It's fairly straightforward. Here's some pseudo code: Code: if (someone puts money into the machine) { prompt snack selection make sure snack is not dispensed if (the person hits the money return button) do nothing } __________________ I copied it from the last program in which I passed a parameter, which would have been pre-1989 I guess. - esbo
NeonBlack is offline

05-07-2008, 10:55 PM	#6
jEssYcAt verbose cat Join Date: Jun 2003 Posts: 209	It ate your money, too? You'll just have to fill out one of those little refund cards. Now where are they...? __________________ abachler: "A great programmer never stops optimizing a piece of code until it consists of nothing but preprocessor directives and comments "
jEssYcAt is offline

05-07-2008, 11:12 PM	#7
Bubba Super Moderator Join Date: Aug 2001 Posts: 7,470	A vending machine would have a significant amount of code to deal with the DBA (dollar bill acceptor), the coin acceptor, the button inputs, and the machinery to actually dispense the product. I would say there is a hefty amount of device code involved.
Bubba is offline

05-08-2008, 12:39 AM	#9
master5001 Banned Join Date: Aug 2001 Location: Visalia, CA, USA Posts: 3,699	Example: Code: switch(user.input) { case A_1: eject(PEPSI); break; case A_2: eject(SPRITE); break; case A_3: eject(DR_PEPPER); break; // etc. } Good luck, friend.
master5001 is offline

05-08-2008, 12:41 AM	#10
master5001 Banned Join Date: Aug 2001 Location: Visalia, CA, USA Posts: 3,699	(I would also like to put my $5 on the fact that this is a homework and this gentleman was not hired to write the logic for someone's machine).
master5001 is offline

04-07-2009, 03:33 AM	#11
blue.machine Registered User Join Date: Apr 2009 Posts: 1	Not really, but i can give you some tips in finding some logic about your programming project well why not to try to search in some open source site about programming i think you can get their some little information about your problem... _________________ Vending Machine
blue.machine is offline

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
School Mini-Project on C/C++ (Need Your Help)..	EazTerence	C++ Programming	4	09-08-2005 01:08 AM
Porting from 32 bit machine to 64 bit machine!	anoopks	C Programming	10	02-25-2005 08:02 PM
Wanna test vending machine	Roaring_Tiger	Tech Board	6	08-25-2004 05:51 PM
Vending machine	Unregistered	C++ Programming	6	06-13-2002 10:21 PM