It is the usage of the computers or microprocessor – based
devices to monitor or measure physical variables over a
period of time.
a device or arrangement for
observing, detecting, or
recording the operation of a
machine or system, especially
an automatic control system.
the extent, dimensions,
quantity, etc., of something,
ascertained especially by
comparison with a standard
In this section you should know
what type of sensors you will be
using , to check out the various
physical variables :
• Blood pressure
• Ph scale ( acidity )
Ph sensor Sound sensor
Sensors , are input devices
used to input data about the
physical changes in the
environment , that has been
monitored / detected.
* You should know that
monitoring and measuring
systems are not like control
The computer is continually monitoring the
sensors , in this case the sensors are sending
the data continually . This data is in the form of
analogue type , thus , it will be converted to
digital data , through …..
ADC “ ANALOGUE – TO –
Which as a result the interface box is biult , and
the sensor is plugged to it , and both are plugged
to the computer.
Output on a printer or speakers if the output is sound.
• Measuring software
• Data logging software.
• The systems in total are called data logging
Monitoring systems are highly used in hospitals. The
monitor is attached to the patient , and then attached to
the computer .
• Pulse rate
• Rate of breathing
• Blood pressure
• Body temperature
• Amount of oxygen in the blood.
Each patient is having its own monitor , which is
connected to the main display monitor for the nurses.
In these monitors various ranges are given , and if
the range of the patient is below or above those
ranges , the alarm will start ringing.
The monitors are used in this field , through
which the computers are used to collect data
• Wind speed , using the rotor to generate
pulses , proportional to the wind speed.
• Wind direction , using angel sensor.
• Temperature , using temperature sensor
• Barometric pressure , using pressure
• Rainfall , using tipping mechanism
• Humidity , humidity sensor
• Sunshine , light sensor.
Data is collected in the database , or in
spreadsheet. It helps in observing global
warming , and forecast the weather.
Climate is measured over a very long period
of time. The collected data will be plotted in a
graph for different variables over a period of
This is used to warn the public , or
authorities of a very high level of
pollutants. Noise levels are monitored,
and river monitored :
• Ph of the river
• Temperature of the stream
• Dissolved oxygen
• Turbidity and water levels.
There are many scientific experiments take place ,
with the presence of the monitors, espicially the
chemical experiments , which last for few seconds or
over a long period of time. Using sensors provide :
• More accuracy
• Enables automatic or immediate processes.
The data collected from the experiment , will be in the
spreadsheet , to make graphs , so it can be imported
into word – processing or desktop – publishing
software for the inclusion in the txt report in the