Presentation on vending machine controller using vhdl

Presentation on Vending
Machine Controller Using
VHDL
Er.Abhinav
Kumar
SHUBHAM
GOYAL

HistoryofVMC
 Vending machine became popular during the
industrial revolution .
 Thefirst modern coin-operated vending machines
were introduced in England in the early1880s .
 Thefirst vending machine in the U.S.wasbuilt in
1888 by the ThomasAdamsGum Company.

What istheVendingMachine??
 Electronic machine used to dispense aproduct to
aconsumer after aprescribed
amount of money hasbeen put into themachine.
 Vending machines are commonly used to
dispense beverages and snackitems, but in
recent yearscompanies have introduced vending
machines that dispense other items, even
including electronic items such asdigital cameras
or iPods.

SimpleVendingMachine
 Thevending machine delivers an item after it has
received prescribed amount of money incoins.
 Themachine have coins slot that accepts one coin ata
time.
 Amechanical sensor indicates whether prescribed no. of
coins hasbeen inserted into the coinslot.
 Thecontroller's output causesasingle item to be
released down aitem(e.g. cold drink) to thecustomer.
 And surplus money returned back to consumer.

BasicFeatureofVMC
• Thebasic feature of Vending Machine Controller
is governed by three mainaspects
1. Controller,
2. Cold Storage,
3. Money Changer.
Every blocks are made by “Structural Modelling”
separately and after this every blocks are port mapped to
each other by “VHDLCoding”

What isVHDL??
 In VHDL“V” stands for Very HighSpeed
Integrated Circuit and “HDL” stands for Hardware
Description Language.
 It is the Hardware Description Languagethat can be
used in electronic design automation to describedigital
and mixed-signal systemssuchasfield-programmable
gate arrays and integrated circuits.

Main PartofVHDL
 There are Three main part of VHDL:-
{1} Library ,
{2} Entity Declaration,
{3} Architecture Body.
 Library:- {syntax}
useieee std_logic_arith. all
useieee std_logic_unsigned. all

(continued)…
….
• Entity Declaration:-All designs are expressed in termsof
entities. An entity is the most basic building block in a
design.
 Syntax:-
entity entity_name is
port (port1 , port2 : port- type data-type;
port n : port type data type) ;
end entity_name ;
 Port Type:- (1)- in
(3)- inout
(2)- out
(4)- buffer

(continued)…
….• Architecture Body:-All entities that canbe
simulated have an architecture description.
Thearchitecture describes the behaviour of theentity.
Asingle entity canhave multiple architectures.
 Syntax:-
architecture arch_name of entity_name is
begin
concurrent_statement ;
end arch_name ;

SomeOtherVHDLTerms
 Configuration
 Package
 Driver
 Bus
 Attribute
 Generic
 Process

Modelling
 Architecture bodycanbemodelin following modelling–
 DataFlowModelling
BasicModelling Behavioural Modelling
 Structural Modelling
 Mixed Modelling

Data FlowModelling
• In this modelling the functionalityof
the object occur due to “ConcurrentStatements”
suchas –
 Direct statement,
 When Elsestatement,
 With Signal select statement,
 Unaffected statement.

BehaviouralModelling
• In this modelling the functionality of thesequence is
defined using “Sequential statement”.
 Syntax:-
entity declaration;
architecture arch_name of entity_name is
begin
[process_label:] process (sensitive_list)
begin
sequential statements;
end process [process_label];
end arch_name;

StructuralModelling
In this modelling an entry is modelledas
aset of interconnected components.
 In the Architecture Declaration part “Component
Declaration” and in the Architecture Body“Component
Instantiation” statements areused.
 Wehave used Structural Modelling in programming of
“VENDINGMACHINE CONTROLLER”.

(continued……)
 Syntax:-
---Component Declaration part---
architecture arch_name of entity-nameis
component component_name is
port (port_declaration);
end component;
---Component Instantiation part---
begin
component_label: component name port map;
end arch_name;

BlockDiagramofVMC
nickel_in
dime_in
quarter_in
clk
rst
Vending-
machine
controller
candy_out
nickel_out
dime_out

StateDiagramRepresentation
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Presentation on vending machine controller using vhdl

CommonlyVendingMachines
Sodavending machine,
Gumball vending machine,
Snackvending machine,
Foodand toy vending machine,
Coffee vending machine,
Popcorn vending machine .

AdvantageandDisadvantage
 Thegreatest benefit of these vending machines isthat
they are very versatile and convenient. When you find
yourself in the middle of closed shops, with ahungry
stomach, avending machine canreally come in handy.
 When you talk about vending machines, costly items
always come with it, making this one of its major
disadvantages. Compared to items being sold inother
stores, those items that are on vending machines are
way on the high-priced spectrum.

Presentation on vending machine controller using vhdl

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