Re: microcontrollers for process control


"a_edwards" <eecoding@xxxxxxxxxxx> wrote in message
news:uOOdnev-2JXo8EvanZ2dnUVZ_hudnZ2d@xxxxxxxxxxxxxxx
hi
i am trying to learn about practical microcontrollers for process
control
at my university and would like some real world examples from practising
engineers. For fire alarm systems for example you would have a control
panel with sounders connected. Are these the main components of the
control panel?

- a 16 bit microcontroller
- external memory
- LCD screen

can someone be give a more detailed explantion of these components if
true, eg what microcontroller?

many thanks
andrew



yes that is good thanks. But i want a example of what is currently used
ny a manufacturer. If the system was for a large building would not they
use a 16 bit micro?

Maybe a 32 bit micro.

Andrew, you need to specify your requirements better. You went from a
possible simple example to a potentially huge complex example. Martin
answered for a simple case which is adequate for a home or small office.
There is almost no end to the possible options that you could ask about. Is
a large building a 100 story office tower, or a single story warehouse?
The answer could take this from an 8-bit embedded application up to a very
complex system using multiple PCs, data collection processors, networks and
all kinds of sophisticated sensors.

Even on the small end, you have to decide whether a single or dual line
character display is what you mean by LCD, or is it a color graphics
display. What does it do when there is an alarm condition? Simply sound an
alarm or dial a telephone and send voice or data message?

Control panel with sounders does not cleary indicate an LCD. A simple
on/off switch and a LED would qualify as a control panel. There would be no
need for the LCD or even the processor. The unanswered question is what
does the control panel do?

Remember, the better you define the problem, the easier it will be to
determine the answer.

Scott


.

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