1. Minor Presentation on Vending Machine Controller Using VHDL
Er. Vishal Yadav
2. What is VHDL ???? In VHDL V stands for Very High Speed
Integrated Circuit and HDL stands for Hardware Description
Language. It is the Hardware Description Language that can be used
in electronic design automation to describe digital and
mixed-signal systems such as field-programmable gate arrays and
integrated circuits. 3. Main Part of VHDL There are Three main part
of VHDL:{1} Library , {2} Entity Declaration , {3} Architecture
Body . Library:- {syntax} use ieee std_logic_arith. all use ieee
std_logic_unsigned. all 4. (continued). Entity Declaration:- All
designs are expressed in terms of 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 (2)- out (3)- inout
(4)- buffer 5. (continued). Architecture Body:- All entities that
can be simulated have an architecture description. The architecture
describes the behaviour of the entity. A single entity can have
multiple architectures. Syntax:architecture arch_name of
entity_name is begin concurrent_statement ; end arch_name ; 6. Some
Other VHDL Terms Configuration Package Driver Bus Attribute Generic
Process 7. Modelling Architecture body can be model in following
modelling Data Flow Modelling Behavioural Modelling Basic Modelling
Structural Modelling Mixed Modelling 8. Data Flow Modelling In this
modelling the functionality of the object occur due to Concurrent
Statements such as Direct statement, When Else statement, With
Signal select statement, Unaffected statement. 9. Behavioural
Modelling In this modelling the functionality of the sequence 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; 10. Structural Modelling In this
modelling an entry is modelled as a set of interconnected
components. In the Architecture Declaration part Component
Declaration and in the Architecture Body Component Instantiation
statements are used. We have used Structural Modelling in
programming of VENDING MACHINE CONTROLLER. 11. (continued)
Syntax:---Component Declaration part--architecture arch_name of
entity-name is component component_name is port (port_declaration);
end component; ---Component Instantiation part--begin
component_label: component name port map; end arch_name; 12.
History of VMC Vending machine became popular during the industrial
revolution . The first modern coin-operated vending machines were
introduced in England in the early 1880s . The first vending
machine in the U.S. was built in 1888 by the Thomas Adams Gum
Company. 13. What is the Vending Machine?? Electronic machine used
to dispense a product to a consumer after a prescribed amount of
money has been put into the machine. Vending machines are commonly
used to dispense beverages and snack items, but in recent years
companies have introduced vending machines that dispense other
items, even including electronic items such as digital cameras or
iPods. 14. Simple Vending Machine The vending machine delivers an
item after it has received prescribed amount of money in coins. The
machine have coins slot that accepts one coin at a time. A
mechanical sensor indicates whether prescribed no. of coins has
been inserted into the coin slot. The controller's output causes a
single item to be released down a item(e.g. cold drink) to the
customer. And surplus money returned back to consumer. 15.
Functional View of VMC 16. Basic Feature of VMC The basic feature
of Vending Machine Controller is governed by three main aspects 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 VHDL Coding 17. Block Diagram of
VMC 18. State Diagram Representation 19. Commonly Vending Machines
Soda vending machine, Gumball vending machine, Snack vending
machine, Food and toy vending machine , Coffee vending machine,
Cigarette vending machines, Pop corn vending machine . 20. Gumball
Vending Machine 21. Coffee Vending Machine 22. Cigarette Vending
Machine 23. Toys Vending Machine 24. Cold Drinks Vending Machine
25. Snack Vending Machine 26. Advantage and Disadvantage The
greatest benefit of these vending machines is that they are very
versatile and convenient. When you find yourself in the middle of
closed shops, with a hungry stomach, a vending machine can really
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 in other stores, those items that are
on vending machines are way on the high-priced spectrum.
