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Embedded Web Technology (EWT)
• This is a new technology that uses the Internet in real
time to control/interact with a device which contains
an embedded system/microprocessor. The user needs
to be authorised to do this and can control a device
anywhere using a web browser (e.g. from a computer
or even a mobile phone which is web-enabled).
• Example: An oven contains an embedded processor.
The owner can use a web-ready mobile phone
anywhere to control the oven remotely. By accessing a
web site he is able to send instructions to control the
oven.
Global Positioning Satellites (GPS)
• Global positioning satellite (GPS) systems are
used to determine the exact location of a car,
airplane, ship or any conveyance which travels
from one place to another. In vehicles these
systems are often referred to as satellite
navigation systems (sat nav).
Satellites in outer space transmit signals to the
Earth. Computers in vehicles (e.g. car, airplane or
ship) receive and interpret these signals. Positioning
depends on very accurate timing – atomic clocks
are used because of their accuracy to within a
fraction of a second per day. Each satellite transmits
data indicating its position and time. The computer
in the vehicle calculates its location based on the
information from at least three satellites