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H.A.C.S.
The Home Appliance Control
System
Presented by The Awesome Group
Presented by The Awesome Group
What is HACS?
A home appliance control system which
uses a remote system such as a mobile
phone or PDA to monitor, control, and
coordinate home appliances such as
your security system, oven, TV, etc.
Assumptions and
Dependencies
Infallibility
No Power Failures
No Network Failures
Each Appliance has Sufficient Power and a
Dedicated CPU
Wireless Network is the same as LAN
HACS has an Internet Connection
Perfect Cellular Reception
Sufficient Hardware
Requirements
HACS should
Allow users to check the status of their
appliances, even when not at home
Activate and deactivate appliances
Alert users and emergency departments to
critical malfunctions
Be able to accept any HACS compatible
appliance
Requirements List
(1) Appliance Control – Appliances, devices such as an oven,
microwave, air conditioner, or sprinkler, can be controlled by a
home owner in a remote location. That is the user may set the
different attributes (e.g. oven temp, AC fan speed, sprinkler
settings etc.) for each appliance from a wireless device
(2) Adaptability/Detection – The system will be able to
detect changes within the home and maintain the user settings.
(3) Manually Adaptable – The user can set system set the
status of different appliances manually and user commands
have precedence over automatic commands.
(4) Communication – HACS should be able to communicate
with all appliances.
(5) Safety – HACS should maintain the safety of the user’s
home and person at all times. Devices should be maintained in
non-hazardous states.
The Big Picture
User HACS
User Interface
Use Case Diagrams • Bad!
(for traceability)
setTimer
setStatus setStatus
HACS
GetTemp
Oven getStatus getStatus
SetTemp
toggle toggle
User ToggleOn/Off
Appliance
User
Appliance
Alert Alert
setTemp AC
Alert
setTemp
ToggleOnOff
Emergency
Service
Use Case Diagram: Over All
Use Case Diagram for Hacs
Register Wireless
<<extends>>
Add Appliance
<<extends>>
Register Appliance
<<uses>> Remove Appliance
User
Login
<<uses>> Get Status
<<extends>>
<<extends>>
PoliceDept Set Status
Manage Status
Appliance
FireDept
Emergency Alert
Use Case: Log In
Login
HACS
• HACS must be secure!
• Nobody other than the owner should be
able to modify an appliance’s status
•What if your neighbor down the street decided to “play
a joke” and turn on your oven!
Sequence Diagrams:
Log In
:UserInterface :HACS :UserRecord
User : User
issuesCommand
connect(id)
verify(id)
returnVerification
Use Case: Get Status
Manag
e
Status <<extends>>
User Appliance
• Is the garage door open? GetStatus
• Did you leave the oven on?
• The user wants to know how the appliances are
operating at any given time!
Sequence Diagrams:
Get Status
:UserInterface :HACS :Appliance
User: User
selectApp
getStatus(app,uid)
Login
getStatus()
returnStatus
returnStatus
displayStatus
In general, this should represent a simple sequence of events
Sequence Diagrams:
Get Status
But what if access is denied?
:UserInterface :HACS :Appliance
: User
selectApp
getStatus(app,uid)
Login
loginDenied
displayDenied
Use Case: Set Status
Manag
e
Status <<extends>>
User Appliance
Set
Status
• Now that you know what the appliance is up to, don’t
you want to change what it is doing?
Sequence Diagrams:
Set Status
:UserInterface :HACS :Appliance
: User
selectApp
setStatus(app,uid,attribute, value)
Login
setStatus(attribute,value)
returnStatus
returnStatus
displayStatus
Use Case: Register Appliance
Add
Applianc
e
<<extends>>
Register
Applianc
e <<extends>>
Appliance
Remove
User Applianc
e
• Register Appliance is extended by Add/Remove
appliance use cases to handle registration
interactions within the HACS system.
Sequence Diagram:
Add Appliance
:Interface :HACS xyz:Appliance
User : User
setup appliance
provide appliance identification details
configure appliance settings
detect appliance
provide ACK
add appliance
provide response
set range limits
store range limits
Sequence Diagram:
Remove Appliance
:UserInterface :Hacs :appliance
User : User
request remove appliance
request remove appliance
remove appliance
notify
Send new status
notify
Use Case: Register Wireless
register
wireles
s
User Wireless
• The user registers a wireless device with HACS.
Sequence Diagram:
Register Wireless
:HACS xyz:Appliance
User : User
add user
provide identification details
add device
send confirmation
Use Case: Emergency Alert
notify
Fire_Department
Intruder_Detector
Alert_controller
Emergency_Dept
Fire_Detector
Police_Department
• Reuse!
Use Case:
Evolved Emergency Alert
PoliceDept
Emergency Alert
Appliance
FireDept
Sequence Diagram: Alert System
:Hacs :Device_interfac abc:Alert_contr emergency: :Police :Fire
e oller Emergency_dept
create_sockets()
Here it is
assumed devices
communicate on start_threads()
sockets
start_sensing()
Hacs notified on socket
forward request on socket
Demultiplex_request()
Hacs notified on socket
connect to data base
connect to data base
Notify_request()
will use some api
or sockets for
communication
wid specific
department
Class Diagram: Alert System
CRC Cards: Appliance
Appliance Object
• Interface between • HACS
HACS and specific
appliances
CRC Cards: Oven
Oven Appliance
• Report Exceptions • HACS
• Change Temperature • Alert Controller
• Change Mode
• Set Timer
• Turn On/Off
CRC Cards: Garage Door
Garage Door Appliance
• Open • HACS
• Close • Alert Controller
• Report Exceptions
CRC Cards: Light
Light Appliance
• On • HACS
• Off • Alert Controller
• Set Intensity
• Report Exceptions
CRC Cards: Alert Controller
Alert Controller Object
• Control Alerts • HACS
• Pass Exceptions to • Appliance
HACS • Appliance subclasses
• Alert Emergency • Emergency Department
Departments
Class Diagram: HACS System
Note hid will contain perhaps an
internet address for the Hacs
system
HACS
hid
UserInterface userRecords
currentWindow apps
uid EMservices
hid connections UserRecord
user_id
Connect(uid)
displayWindow(window) getStatus() setId(user_id)
getStatus(hid, appliance) setStatus() getId()
setStatus(hid, appliance, attribute, value) addAppliance()
getAppliances(hid) delAppliance()
notify()
Login()
<<actor>>
appliance
appId
attributes
hid
get(attribute)
set(attribute, value)
alert(hid)
GarageDoor Windows lights
FireAlarm
open()
close() setSecurity(on_off) on()
detect()
detectMotion() off()
setIntensity(value)
The END!
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