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Some time ago I realized that
at some point almost every home would have an Ethernet connection to the internet. This simple fact opens some interesting
possibilities.
I am sure you have heard
about "web appliances". The concept of having your toaster or
your dish washer connected to the web does not offer much value. However,
the fact that you can have a low cost connection to your home to switch on
the lights, receive an SMS on your cell phone in case of an alarm or to set the room
temperature before you get home from work may be a much more interesting
concept.
In order for this
solution to be low cost, robust and maintenance free, we have not gone for
a PC based solution. Of course it would be a much more easy approach but
to have a PC running 100% of the time for a system like this is not
desirable.
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General
System Layout
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The I/O Webserver
in this diagram is only there to present the actual I/O points on
the web. It is a small embedded microprocessor system with some
basic I/O and RS232 communication. However, there are several
possibilities to extend the system. Of course, it is also
possible to add more I/O Webservers on the home network. Here you
can see what is really in the I/O
Server.
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