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Advanced Embedded Systems Design CE323/860 Ali Hoshiar Spring 2021
CE323/CE860 Advanced Embedded Systems Design Assignment 2
The assignment is worth 25% of the total mark for this module. This assignment is to design a home
alarm system based on the mbed NXP LPC1768 and its virtual board (2 LEDs, 2Switches, 1 LCD, 1 virtual
keypad, 1 alarm-LED) or based on the Arduino and virtual board on tinkercad. The home alarm system
specification is given below. The sensors mentioned below will be replaced with the switches in the
virtual extension board and the alarm is replaced with a LED in your design. Based on the specification,
you need to develop a formal specification using a graphical representation (preferably Unified
Modeling Language (UML)). The UML specification should include structure diagrams (class diagrams
and/or object diagrams), and behaviour diagrams (state machine diagram, sequence diagram). The
formal specification should be written in a report. Then you must write a C/C++ program to implement
the design of the home alarm system. You also need to make a demonstration in the lab.
The report:
The report should be in PDF and must include a cover page with the module name, student name and
ID. The source code should be included in the report. The maximum length of the report is of 5 pages
for CE323 Students and 10 pages for CE860 students (without appendix).
An important note for CE860 Students:
The program and functionality are similar. However, higher level of technical explanations is expected
from CE860 students. Therefore, the length of the report is considered to be 10 pages.
The report should include:
- Requirement form
- UML graphical representation of the system
• class diagrams
• state machine diagrams
• sequence diagrams
When necessary, you should provide explanation. - Source code
The parts of code you are developing in the labs can be used in your program. You must complete the
program and deliver required functionalities. You can also use the program developed in the
Assignment 1 (virtual extension board). Full source code should be provided in the report as an
appendix.
*Online version
Considering the limited access to the labs due to the COVID-19 pandemic. Mbed online simulator or
tinkercad online simulator is used for evaluating the code.
Advanced Embedded Systems Design CE323/860 Ali Hoshiar Spring 2021
Submission:
The report should be submitted through the online coursework submission system (FASER). You
should submit a single pdf file called“CE323 Assignment 2 (your name)”for CE323 students and
“CE860 Assignment 2 (your name)”for CE860 students and.
Assessment criteria:
• Following the rules mentioned in this document for the submission and preparation of the
assignment 10%
• Class diagram 10%
• State machine diagram 10%
• Sequence diagram 10%
• Correctness of program 40%
• Quality of program 10%
• Clarity of program and comments briefly 10%
Late submission and plagiarism
This assignment is to be done individually, i.e. whatever you submit must be your own individual work.
Any software or any other materials that you use in this assignment, whether previously published or
not, must be referred to and properly acknowledged. Please be aware that the module supervisor may
ask students for an interview to explain their submitted work. Please refer to the Undergraduate
Students’Handbook for details of the School policy
regarding late submission and University regulations regarding plagiarism:
http://www.essex.ac.uk/ldev/r…
http://www.essex.ac.uk/about/…
Advanced Embedded Systems Design CE323/860 Ali Hoshiar Spring 2021
Home Alarm System - Introduction to alarm systems
A home alarm system is constructed from various separate parts, which all connect to a central control
unit (in this link you can find a DIY example of a home alarm system). Your task is to implement a basic
control unit and the functionality behind its user interface. To complete this task you must first
understand the specification of the external parts provided and the required behaviour of the overall
system.
A conventional alarm system normally contains:
• Central control unit
• Keypad entry point / user interface
• Sounder unit
• Sensors such as: magnetic contacts (reed switches), pressure mats, movement sensors like
passive infrared sensors (PIRs).
In the case of the sensors, they all contain switches that are“closed”circuit under normal
circumstances. This type of switch is known as a Normally Closed (NC) switch, the converse is known
as Normally Open (NO). Magnetic contacts are used to detect when doors and windows are opened.
When a door is opened a magnet is moved away from the reed switch which causes the switch
contacts to open. Likewise, when a movement sensor is triggered or a pressure mat depressed the
circuit is broken (the switch is opened), see Figure 1. The opening of a contact can be detected by
using one of the microcontroller’s parallel port inputs, connected to the top of the switch whose lower
end is connected to GND. The top of the switch is also connected through a resistor to 3.3v (V+). When
the switch is closed the port, input is connected to 0v (GND), and it will be pulled-up to 3.3v (V+) by
the resistor when the sensor’s switch opens. Therefore, the microcontroller input is logic low (0v)
when a door is closed / there is no movement, and logic high (3.3v) when the sensor is activated. The
alarm controller must detect these events and respond as specified later in this document. In this
assignment the sensors are emulated using normally closed push to break switches.
Figure 1: Alarm sensors
Normal home alarm systems include multiple sensors located in various locations, each location can
have its own circuit which allows identification of the triggered switch, i.e. it lets the user know where
the break-in occurred. Each sensor circuit is known as a zone, and zones can have different behaviour.
Advanced Embedded Systems Design CE323/860 Ali Hoshiar Spring 2021 - Functional Specification – Zone Behaviour
The virtual extension board (3 LEDs, 2 Switches, 1 LCD, 1 virtual keypad), will be used for
demonstration. This alarm has SIX states of operation set, unset, entry, exit, alarm, and report. Initially
it is in the unset state.
• Unset state:
▪ In the unset state, activation of any of the sensors should not cause the alarm-LED to
blink.
▪ Entry of the correct four-digit code in the user interface (described later) followed by
“B”should cause the system to change to the exit state.
▪ If the user enters an invalid code three times, the alarm should change to the alarm
state.
• Exit state:
▪ When in the exit state, the user has a time interval called the exit period (you can
choose any time e. g. 1 minutes) in which to evacuate their home.
▪ In the exit state, activation of any sensors in a full set zone should cause the alarm to
enter the alarm state.
▪ Whilst in the exit state the alarm-LED should blink.
▪ If the user enters their four-digit code followed by“B”within the period, the exit state
should change to the unset state.
▪ If an invalid code is entered three times, the exit state should change to the alarm
state.
▪ If all the zones are inactive when the exit period (e. g. 1 minutes) expires, the exit
state should enter the set state.
• Set state:
▪ In the set state, activation of any sensors in the set state zone should cause the
system to enter the alarm state.
▪ Activation of the entry / exit zone should change the state to entry state.
• Entry state:
▪ The purpose of the entry state is to allow the user a period of time to gain access to
their home so that they can unset the alarm, this duration is known as the entry
period (e. g. 2 minutes).
▪ Whilst in the entry state, the alarm-LED should sound blink.
▪ If the user enters their four-digit code followed by“B”within the period, the state
should change to the unset state.
▪ If the user fails to enter their correct code within the entry period, the state should
change to the alarm state.
▪ In the entry state, activation of any sensors in a full set zone should cause the state
to enter the alarm state.
• Alarm state
▪ When in the alarm state, the alarm-LED should be on all the time.
▪ After 2 minutes, the alarm-LED unit should be disabled.
▪ If the user enters the correct code followed by“B”, the alarm should change to the
report state, otherwise stay in the alarm state.
Advanced Embedded Systems Design CE323/860 Ali Hoshiar Spring 2021
• Report state
▪ When in the report state, the LCD should show the zone numbers or code error
information in the first line (e. g.‘code error 1’). In the second line it should show“C
key to clear”.
▪ When an“C”is entered, the alarm should change to the unset state. - Functional Specification – User Interface
The user interface consists of:
• a 4×4 virtual keypad
• a 16 character by 2-line LCD display
• 1 LEDs for entrance door (replaced with 1 switch connected to a LED)
• 1 LEDs for alarm.
• 1 sensor for 1 zone (replaced with 1 switch connected to a LED)
Fig. 2 Mbed online simulator for home alarm system
Advanced Embedded Systems Design CE323/860 Ali Hoshiar Spring 2021
Fig. 3 TinkerCAD online simulator for the home alarm system
When a sensor in a zone is active (circuit broken), the corresponding LED should be illuminated. When
the system leaves the alarm state, the alarm-LED should be off.
The LCD should display the state of the system on the first line of the LCD display.
• When the user enters the first digit of their code in the unset state, the second line of the
display should additionally show left aligned“Code: * _”with the“_”characters being
replaced with each successive digit entered.
• If the user presses the“C”key, then the last entered character should be deleted and replaced
with“_”unless there are no characters left, in which case the display should only display the
state, i.e. be the same as when none of the code had been entered.
• When all four digits of the code have been entered, the second line of the display should
display“Press B to set”.
• Any other key should cause the code entry procedure to abort without checking the user
code.
Advanced Embedded Systems Design CE323/860 Ali Hoshiar Spring 2021
Alternative Design Assignment 2
For the students with Experience/Interest in embedded system programming a complementary
assignment task is available. If you feel you are interested in doing more than tasks in the current
assignment you can volunteer for this extra task. This extra work is on the design and development of
an embedded system for the microrobotics system we are currently developing in the University of
Essex (Fig. 4).
Fig. 4 Magnetic actuation system for Microrobotics studies
The following system is controlled by Mega Arduino. We have developed a MATLAB connection and
we want to monitor the system in real time using cameras. The system controls a 3D magnetic field.
Please kindly note that the requirement and the quality of the work is high for this design and you
should discuss during the lab 6 with the module supervisor.
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