Objective:
The objective of this
complex engineering problem is to investigate and design a practical real world application that has following
attributes:
1. The
problem has no obvious solution and requires abstract thinking, originality in
analysis to formulate suitable
models.
2. This problem involves
Interdependence and is a high level problem including many componentparts and sub-problems.
This problem will design and
simulate a coin operated vending machine.
Complex
Engineering Activity Outcomes (CEAO):
Through the course of this
engineering activity, students should be able to partially attain some or all
of the following graduate
attributes:
1. GA1: Engineering
Knowledge
2. GA2: Problem Analysis
3. GA3: Design/Development
of Solution
4. GA4: Investigation
5. GA5: Modern Tool usage
This activity is mapped on CLO2
and your performance in this project will play an important role in the attainment of this course learning outcome. .
CLO2 |
Apply acquired
problem-solving knowledge both in individual capacity and teamwork to
reproduce results. |
PLO9 |
P3 |
Task Goals:
The goals of this
engineering problem are to:
1. Design a digital
circuit according to given specifications.
2. Gain experience
with modern CAD techniques used to design digital systems.
3. Learn how to get
information from professionally written manuals (e.g., 7-Segment)
4. Learn to test
designs with simulation.
5. Learn to perform
physical testing.
6. Learn how to work
in a team.
7. Learn how to write a project report.
Problem Statement:
You have to design and
simulate a circuit for a vending machine using switches, lamps (LEDs) and seven-segment displays. The
following design specifications are to be followed:
·
The vending machine takes two types of inputs,
coins and choice of product.
·
The vending machine should accept and
differentiate between different money denominations. Assume that there are only 1, 2, 5 and 10 rupee coins available.
The different type of coins can be denoted
by four different switches.
·
This machine sells 8 different type of products,
each with different prices. None of the products can cost exactly 1, 2, 5 or 10 rupees. Choice of product can be
indicated by toggle switches. Users are
only allowed to purchase 1 product at a time.
·
Two types of outputs are generated by the
vending machine; indication of product purchased and the amount of change that needs to be returned.
·
One out of 8 LEDs for each product should light
up indicating a successful purchase. Another LED should light up if the input money is less than the price of any
desired product.
·
The amount of change that needs to be returned
must be displayed on 7 segment displays.
·
Once the money credited to the user is returned,
the vending machine should be able to reset the money counter while triggering an LED to indicate change has
been returned. A new product could then
be purchased.
·
The vending machine design should be able to
keep track of inventory in the machine. It can be assumed that in the initial state,
the machine is full and there are five items for each of the 8 selections.
Deliverables:
You are supposed to submit the following deliverables by the deadline:
• Hardware implementation of the
sequential vending machine
• Detailed report on the design
and working of the vending
machine
• Simulation
circuit on Proteus
Each group
will have to present their
project on the above-mentioned date.
Report Instructions:
Your written report
should be concise and professionally written. It is expected that you will
follow the provided format closely. Departures from the format may result in
deduction of points from your grade. The task report must contain the following
sections:
1. Task Description:
This section should describe your design. It should provide the reader with
information he would need to understand how the circuits work and how you
designed them.
2. Theory of
operation: Explain how your circuit works, but do not give implementation
details. This should be an expanded version of the introduction. That is, give
a high level description of what your circuits do and how they do it. For
example, you could explain any conditions or restrictions the user must observe
to use the circuits, and the high level structure of your circuits at the block
diagram level.
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