Programming Assignment 1: Identifying System Actors And Goals

Programming Assignment Week 3
a. Identify System Actors and Goals

1. Home Owner: The home owner is an initiating actor whose goal is to light the outside area of the garage as well as open the garage door.
2. Motion Detector: The motion detector is a supporting actor whose goal is to send a signal to the external light bulb once it sense movement.
3. External Light Bulb: The external light bulb is a supporting actor whose goal is to light up once it receives a signal from the motion detector.
4. Motor for Moving Garage Door: The motor is a supporting actor whose goal is to move the garage door once it receives a signal from the manual opener switch or the remote control ratio transmitter or receiver, or to stop and reverse door movement if

Manual Opener Button Switch: The manual opener button switch is a supporting actor whose goal is to send a signal to the motor to open or close the door after receiving a signal from the home owner.

b. Derive Use Cases Relevant to System Objective and Write Brief Description

1. UC-1 (Open Door): Open the garage door
2. UC-2 (Close Door): Close the garage door
3. UC-3 (Turn on Light): Turn on the outside light

Actor Actor’s Goal Use Case Name
Home Owner Turn on the light bulb by setting of motion detector in detection area. Turn on Light (UC-3)
Home Owner Use the manual switch to open the garage door. Open Garage Door (UC-1)
Home Owner Use the manual switch to close the garage door. Close Garage Door (UC-2)
Home Owner Use the remote control to open or close the garage door. UC-1, UC-2
Motion Detector Sense movement in detection area and send a signal to the light bulb. UC-3
External Light Bulb Receive signal from motion detector and turn on. UC-3
Motor for Moving Garage Door Open or close garage door depending on the signal it receives and from what device. UC-1, UC-2
“Electric Eye” Sensor Stop garage door from closing and opens the door if it senses an object in the way. UC-1, UC-2
Remote Control Radio Transmitter Send signal to receiver to open garage door if closed, and close garage door if open. UC-1,

UC-1, UC-2
Manual Opener Button Switch Open garage door if closed, and close garage door if open. UC-1, UC-2

c. Draw Use Case Diagram for the System

d. Fully Dressed Description of Remote-Controlled Garage Door Opening Use Case

Use Case UC-1: Open Garage Door
Related Requirements: Requirement to open door when remote is pressed

Initiating Actor: Home owner

Actor’s Goal: To press the remote control and have the garage door open.

Participating Actors: Motor for moving garage door, Remote control radio transmitter, Remote control radio receiver

Preconditions: *Remote control has power and is able to send signal *Nothing is blocking the radio signal and within range *Receiver has power and is able to signal motor to open door

Postconditions: *Garage door open

Flow of Events for Main Success Scenario:
 1. Home owner presses remote control opener to signal receiver
 2. Remote control signals radio receiver to signal motor to open door
 3. Radio receiver signals motor to open door
 4. Door opens.

e. System Sequence Diagram for Previously Described Use