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From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Newsgroups: comp.lang.ada
Subject: Re: Point a beginner in the right direction? Cheap bare-board to run
 with a RTOS for running ADA
Date: Wed, 10 Jul 2013 10:06:19 +0200
Organization: cbb software GmbH
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Date: 2013-07-10T10:06:19+02:00
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On Wed, 10 Jul 2013 00:23:01 +0200, Georg Bauhaus wrote:

> Connect a thermometer in a fridge to an LCD display, with a controller
> between them. Do I need tasking? TCP sockets? File systems?

Sure. E.g.

   http://www.beckhoff.de/english.asp?ethercat/et1100_et1200.htm 

The sensor is a PT100, an analogue input sampled independently on the I/O
protocol. In this case of ET1100 it is EtherCAT. The nature of the
communication is that I/O to the master and sampling can be asynchronous or
triggered by communication I/O etc. In short, it is tasking, shared memory,
barriers and other "nice" stuff.

This is clearly all over the top for a fridge right now. But this is not so
distant future. A telephone is already a personal computer with all bells
and whistles. So any household device will become. 

It may be funny, but yes, to service one bit of data of an actuator or
sensor you will have a whole computer attached to it wielding the power of
a workstation in early 90's.

-- 
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de