[Year 12 SofDev] Data Flow: Can a machine / sensor be an entity?

[Walker, Michael A]

My understanding was that if it is an external person, organisation or other system entering data into, or receiving data from your system, then it is an entity external to your system and needs to be represented.

The example I give students is that Centrelink requires data from the bank about your bank accounts, balances, etc. The banking system therefore is an entity entering data into the Centrelink system for them to cross check with what you have told Centrelink about your income. Equally, Centrelink is an entity receiving a data flow from the banking system, so would be represented as an entity in the banking system data flow diagram.

Hope this helps, and happy to be corrected,
Michael Walker,
Doncaster Secondary College.

From: sofdev-bounces at edulists.com.au [mailto:sofdev-bounces at edulists.com.au] On Behalf Of Ciappara, Anthony A
Sent: Wednesday, 1 June 2016 9:34 AM
To: Year 12 Software Development Teachers' Mailing List <sofdev at edulists.com.au>
Subject: Re: [Year 12 SofDev] Data Flow: Can a machine / sensor be an entity?


Daryl



How did you deal with it in the context diagram?  As an entity that sends data to the system or as part of the system?



Anthony

________________________________
From: sofdev-bounces at edulists.com.au<mailto:sofdev-bounces at edulists.com.au> [sofdev-bounces at edulists.com.au] on behalf of Croke, Daryl D [croke.daryl.d at edumail.vic.gov.au]
Sent: Tuesday, 31 May 2016 9:03 PM
To: Year 12 Software Development Teachers' Mailing List ‎[sofdev at edulists.com.au]‎
Subject: [Year 12 SofDev] Data Flow: Can a machine / sensor be an entity?
Hi all

Can a machine / devise / sensor be an entity in a data flow diagram?

I want to model an Arduino home project I have been working on for my students.  Three temperature sensors inside a solar heater will determine the fan speed of an output fan blowing warm air into my house during winter.  The user will be able to view temperature, fan speed, watts generated, minimum/maximum temperatures and be able to change fan trip levels and CMF ratings.

It would be easy if I could treat the Arduino device and sensors as being an entity that has inputs and the code to be viewed as the process.  Level One and Two drawings would break up the sub-processes. Not sure if this technically correct?
Cheers

Daryl Croke

Mount Ridley College
8338 3600
http://mountridleycollege.vic.edu.au/<https://www.edumail.vic.gov.au/owa/redir.aspx?REF=IDWvJcYrweRr7xgWuy-BsCzeCk038uWbHFyfrlWzthp5MPDIq4nTCAFodHRwOi8vbW91bnRyaWRsZXljb2xsZWdlLnZpYy5lZHUuYXUv>

keep on coding
http://geekstuff.global2.vic.edu.au/<https://www.edumail.vic.gov.au/owa/redir.aspx?REF=VmCEdGwd_yD4ZC4zcv_p4VTUZ-3K8wlZumMbPBGh6lZ5MPDIq4nTCAFodHRwOi8vZ2Vla3N0dWZmLmdsb2JhbDIudmljLmVkdS5hdS8.>
http://physicalcomputing.global2.vic.edu.au/<https://www.edumail.vic.gov.au/owa/redir.aspx?REF=zJjXq1ev_2DB5cE30EuE6yXw9YAiao9K9WPNTlTT--Z5MPDIq4nTCAFodHRwOi8vcGh5c2ljYWxjb21wdXRpbmcuZ2xvYmFsMi52aWMuZWR1LmF1Lw..>



Important - This email and any attachments may be confidential. If received in error, please contact us and delete all copies. Before opening or using attachments check them for viruses and defects. Regardless of any loss, damage or consequence, whether caused by the negligence of the sender or not, resulting directly or indirectly from the use of any attached files our liability is limited to resupplying any affected attachments. Any representations or opinions expressed are those of the individual sender, and not necessarily those of the Department of Education and Training.

Important - This email and any attachments may be confidential. If received in error, please contact us and delete all copies. Before opening or using attachments check them for viruses and defects. Regardless of any loss, damage or consequence, whether caused by the negligence of the sender or not, resulting directly or indirectly from the use of any attached files our liability is limited to resupplying any affected attachments. Any representations or opinions expressed are those of the individual sender, and not necessarily those of the Department of Education and Training.

Important - This email and any attachments may be confidential. If received in error, please contact us and delete all copies. Before opening or using attachments check them for viruses and defects. Regardless of any loss, damage or consequence, whether caused by the negligence of the sender or not, resulting directly or indirectly from the use of any attached files our liability is limited to resupplying any affected attachments. Any representations or opinions expressed are those of the individual sender, and not necessarily those of the Department of Education and Training.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://www.edulists.com.au/pipermail/sofdev/attachments/20160601/2a713403/attachment.html