[Year 12 SofDev] sofdev Digest, Vol 135, Issue 2

[Vella, James]

Hi guys

I didn't think that entities could receive "data flows" directly from other entities as Michael has suggested. It would have to go via the system...

JV


James Vella
Digital Technologies Learning Area Leader eLearning Leader
MacKillop College
Russell Street Werribee VIC 3030

T:  +61387345200
F:  +61387345261

http://www.mackillop.vic.edu.au

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Today's Topics:

   1. Re: Data Flow: Can a machine / sensor be an entity?
      (Walker, Michael A)
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Message: 1
Date: Wed, 1 Jun 2016 03:27:46 +0000
From: "Walker, Michael A" <walker.michael.a at edumail.vic.gov.au>
Subject: Re: [Year 12 SofDev] Data Flow: Can a machine / sensor be an
entity?
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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

keep on coding

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