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Designing automatic coin operated Drinks Dispenser Machine for a large library A Functional Specification Document Version: 1.0 5/23/2018 Prepared by: Mulatu Gebeyaw [20176864] Submitted to: Professor DOĞAN İBRAHİM Nicosia, 2018 i Table of Contents 1. Introduction ......................................

Description

Designing automatic coin operated Drinks Dispenser Machine for a large library A Functional Specification Document

Version: 1.0

5/23/2018 Prepared by: Mulatu Gebeyaw [20176864]

Submitted to: Professor DOĞAN İBRAHİM

Nicosia, 2018 i

Table of Contents 1.

Introduction ..............................................................................................................................1 1.1.

Purpose ..............................................................................................................................2

1.2.

Scope..................................................................................................................................2

2.

Work break down using Gantt chart .........................................................................................2

3.

Business requirements of coin-operated Drinks Dispenser Machine ..........................................3

4.

3.1.

Context diagram ................................................................................................................3

3.2.

Functional Requirements ...................................................................................................5

Use Case Diagram and Descriptions ........................................................................................ 11 4.1.

Use Case Diagram ............................................................................................................ 11

4.2.

Use Case Descriptions ...................................................................................................... 11

5.

Conclusions ............................................................................................................................. 16

6.

References ............................................................................................................................... 17

Table of Figures Figure 1 Work break down using Gantt chart........................................................................................2 Figure 2 Context Diagram....................................................................................................................3 Figure 3 Flow chart.............................................................................................................................4 Figure 6 Use case diagram................................................................................................................. 11

List of tables Table 1 Requirement priority level .......................................................................................................5 Table 2 Drinks dispenser machine requirements...................................................................................6 Table 3 restart transaction ................................................................................................................ 11 Table 4 Restart transaction................................................................................................................ 12 Table 5 Insert Coin............................................................................................................................ 12 Table 6 Cancel request...................................................................................................................... 13 Table 7 Change Selection .................................................................................................................. 14 Table 8 Request Refund .................................................................................................................... 14 Table 9 Continue Buying ................................................................................................................... 15 Table 10 Display Message ................................................................................................................. 15

ii

1. Introduction Selling and buying goods, foods, drinks, and newspapers is common in supermarkets, hotels, schools, hospitals, stadiums, airport stations and on the road. All these are done with the help of vending machines meaning “a machine that dispenses small articles such as food, drinks, or cigarettes when a coin or token is inserted”. Vending Machines are used to dispense various products like Tea, Coffee, Snacks, and Cold Drink etc. when money is inserted into it perhaps with no money like in offices and in a restaurant which has manual billings. These machines are likely used in a various area like a commercial, industrial, shops, organization etc. Vending Machines have been in existence since the 1880s [1]. The first commercial coin-operated machine was introduced in London and England used for selling postcards [1]. The vending machines are more accessible and practical than the convention purchasing method. Nowadays, these can be found everywhere like at railway stations selling train tickets, in schools and offices vending drinks and snacks, in banks as ATM machine and provides even diamonds and platinum jewelers to customers, in entertainment stations like pool tables, boxer, and Table football. All these and other similar machines operated using Finite State Machine principles whereby the machine will be at one state in time. In this case, the circuit’s output is defined in a different set of states (The number of states is finite) i.e. each output is a state. A State Register to hold the state of the machine and a next state logic to decode the next state. An output register defines the output of the machine. Dynamic elements: The subset of dynamic elements includes the input provided to the FSMs and the output generated from the FSMs in dynamic executions of the FSM. In general, both the number of different input and the number of different output are also finite [2]. In FSM based machines the hardware gets reduced as in this the whole algorithm can be explained in one process.

1

1.1.

Purpose

The purpose of this document is to give a detailed description of the requirements for the “automatic coin-operated drinks dispenser machine” that provides Tea, Coffee, Coke, and Orange Juice which can be implemented in the large library but not limited only it can also use in all level of libraries.

1.2.

Scope

This document describes the functional requirements (use cases) and design constraints (nonfunctional requirements) of an automatic coin-operated drinks dispenser machine as viewed from the perspective of the software developer, an automatic coin-operated drink dispenser machine, and the system’s typical end user, the Coffee User. Its purpose is to formally capture and present an operational view of an automatic coin-operated drink dispenser machine and to enumerate the system requirements as understood by the developer.

2. Work break down using Gantt chart

ID

Task Name

Start

Finish

Duratio Compl n ete

1

Literature Review

Mar.15,18

Mar.29,18

7.0 d.

2

Writing Introduction

Apr.3,18

Apr.5,18

3.0 d.

0.0% 0.0%

3

Flow Chart Design

Apr.5,18

Apr.10,18

2.0 d.

0.0%

4

Requirement Gathering and Identification

Apr.12,18

Apr.26,18

7.0 d.

0.0%

5

Use Case Drawing

May.1,18

May.8,18

4.0 d.

0.0%

6

Use Case Description

May.9,18

May.15,18

3.0 d.

0.0%

7

Writing Conclusion and Review the Document

May.16,18

May.24,18

5.0 d.

0.0%

Figure 1 Work break down using Gantt chart

2

3. Business requirements of coin-operated Drinks Dispenser Machine 3.1.

Context diagram

This section provides a detailed description of inputs into and outputs from the system using a diagram. It also gives the logical layout of the system how it works and how the operations are handled.

Block Diagram of the Vending Machine

Reset

Input (Coin)

Coffe

Output

Tea

Coke

Orange Juice

Valance Coin

Figure 2 Context Diagram

3

Automatic coin operated drinks dispenser machine Start/Reset

Select Product

Coffee

Yes

No

Tea

No

Coke Yes

Yes

No

Orange Juice

Yes

Display Cost Cancel

Select other Product

No No

Continue Yes

Cancel Request Insert Coin

No Coin==Cost Yes

Dispense Product

Yes

Continue No

Finished

Figure 3 Flow chart

4

3.2.

Functional Requirements

Requirements are the reasons for a project to be developed and deploy on which what the coin-operated drinks dispenser machine can do, what data it shall store and how quickly or how easily it shall perform. In doing so, a project must have SMART requireme nts. This machine will programme to receive the currency and validate the same before disbursing coins in various denominations selected by the user. More or less this system requirements are grouped into User Requirements, System requirements, data requirements as stated below. The requirements, both functional and non-functional, in this document are prioritized as follows: Table 1 Requirement priority level

Value

Rating

Description

1

Critical

This requirement is critical to the success of the project. The project will not be possible without this requirement.

2

High

This requirement is high priority, but the project can be implemented at a bare minimum without this requirement.

3

Medium

This requirement is somewhat important, as it provides some value but the project can proceed without it.

4

Low

This is a low priority requirement, or a “nice to have” feature, if time and cost allow it.

5

Future

This requirement is out of scope for this project, and has been included here for a possible future release.

5

Table 2 Drinks dispenser machine requirements

Req#

Priority

Description

Rationale

Impacted Stakeholders

User requirements Users press restart button to reset previous FR-U-001

1

A new transaction shall be started

Users

transactions and conditions to clear transaction history. Users select a product from the list of

Users

FR-U-002

1

List of products must be displayed

FR-U-003

1

Cost of the selected item must be displayed

FR-U-004

1

Coin must be inserted to get the product

FR-U-005

2

The transaction shall be canceled as required

A user can press Cancel button.

Users

FR-U-006

3

The transaction shall be continued as

A user can use Continue to Buy button

Users

products on the displaying screen. Users read and confirm by pressing continue button. A user can insert coin into the machine

Users

based on the indicated price

required without restarting the whole steps

6

Req#

FR-U-007

Priority

2

Description

Order shall be changed as required on specific instant state of the machine

Rationale A user can change order e.g. if s/he doesn’t

Impacted Stakeholders Users

have enough coin to buy for the item they choose

System requirements FR-S-001

2

The status of the machine shall be displayed

Only readily items must be displayed as item FR-S-002

1

The system shall display status information

Users and

whether it works or not.

Customers

E.g. coffee is not ready for sale

Users

E.g. if sugar is finished

Customers

Coin may be refund when the user cancels

Users

list otherwise appropriate information to the user

FR-S-003

2

Alert sound shall be played automatically by the machine if any of ingredient is finished The system shall refund the coin if in need by

FR-S-004

2

the user before the item gets ready for dispense

the request or the coin they insert is not sufficient with appropriate information to the user

7

Req#

FR-S-005

Priority

3

Description

Rationale

Impacted Stakeholders

The system shall display welcome and

Users and

goodbye messages at the beginning and end

Customers

of the transaction respectively. FR-S-006

3

FR-S-007

3

FR-S-008

2

The system shall be developed either as touch

The machine may be developed based on

Users and

screen or button command based.

the customer’s choice

Customers

The system must display waiting time as a

E.g. during boiling, adding ingredients and

Users

message to the user in preparing the items

the like.

The system shall display items’ name along

E.g. for coffee the icon must indicate the

with acceptable icons

coffee Users

The system must dispense the selected item FR-S-009

1

Users

only if the amount coin is inserted unless it must rollback the transaction.

FR-S-010

4

FR-S-011

3

The system shall return the selected product and remaining change if any The system shall allow resetting operation for

E.g. for first time installation

Customers

vending machine supplier.

8

Req#

FR-S-012

FR-S-013

Priority

2

1

Description

Rationale

Impacted Stakeholders Users

The system shall allow a user to select products coffee, tea, Coke, Juice, ... E.g. 1, 5, 10, 25, and 50 Cents i.e. penny,

Users and

The system must accept coins of different in

nickel, dime, and a quarter as a sample but

Customers

amount

standards must set on coin types with the corresponding price.

FR-S-014

1

FR-S-015

3

FR-S-016

1

The system must compare item cost with entered coin The system must show light at the interface

Users

of coin insertion hole The system must check the validity of the coin

Data requirements The system shall store Coke in the container FR-D-001

3

and allow users to select it from the displaying screen as cold coke and normal coke.

9

Req#

Priority

Description

Rationale

Impacted Stakeholders

The system shall store Tea Spice, water, and FR-D-002

3

sugar and allow users to mix sugar manually or automatic from the machine. The system shall store Coffee and allow the

FR-D-003

3

user to mix sugar manually or automatically by the machine

FR-D-004

3

FR-D-005

1

The system shall store juice powder and mix sugar manually or automatically The system must store the coin and allow the administrator to open the case to pick it up.

Other requirements The system shall be design based on acceptable GUI standards so that users can FR-O-001

2

easily communicate to the system and navigate from one state of the machine to another state with no or fewer (if any) difficulties.

10

Req#

Priority

Description

Rationale

Impacted Stakeholders

The system shall provide waiting and FR-O-002

3

completion time as a message and the message shall be short and precise based on message standards.

11

4. Use Case Diagram and Descriptions 4.1.

Use Case Diagram

Use Case Diagram Play Alert Sound

Select Product

Power On Power Off Display Items

Insert Coin

Power Source Compare Price

Cancel Request

start brewing Change Selection

User

Check Coin System

Request Refund Dispense Selected Product Continue buying Dispense Coin

Restart transaction

Display Message

Figure 4 Use case diagram

4.2.

Use Case Descriptions

Table 3 restart transaction

Name

UC001, Select product

Actor(s)

User

Goal

the goal of this use case is to refresh the machine by clearing transaction history

Precondition(s)

1. The machine power should be plugin and the machine should be at working state

Basic flow

1. The user must click on restart button 2. The program clears all previous transaction history

Post

1. The machine should display welcome message to the user

condition(s)

2. The machine display the list of items ready to dispense

Alternative flow

for this use case no alternative flow of action

Exception(s)

No exception for this use case

Table 4 Restart transaction

Name

UC002, Restart transaction

Actor(s)

User

Goal

the goal of this use case is to select one item for dispensing

Precondition(s)

UC001

Basic flow

1. The user has to click on product name (if it is touch screen) or the corresponding button 2.

Post

1. The system displays the cost of the selected item

condition(s)

2. The system asks the user to enter coin

Alternative flow

for this use case no alternative flow of action

Exception(s)

No Exception for this use case

Table 5 Insert Coin

Name

UC003, Insert Coin

Actor(s)

User

Goal

the goal of this use case is to accept price/cost of the item being selected from the user
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