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Data Logging
· Data logging is the automatic capture and
storage of data
· There is little or no human involvement in this
process
· Sensors are used to capture data from the
environment
­ The sensors are usually connected to a data logger
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Examples of Data Logging
· Weather conditions
­ Amount of rainfall
­ Maximum and minimum temperatures
­ Wind speed
· Temperature inside an active volcano
· Number of cars in a car park
­ Stops cars from entering if the car park is full
­ Allow cars to enter in if there are spaces available
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Types of Sensors
· Light sensor
­ Detects if light is present
­ Measures the amount of light
­ Street lamps use light sensors to switch on when it
gets dark, and to switch off when it is light enough
· Temperature
­ Measures the current temperature of an object or
situation
­ Used in weather stations and central heating systems
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Types of Sensors
· Pressure sensors
­ Detects pressure as it touches an object
­ Can measure the number of cars entering a car park
because there are sensors at the entry point
· Passive Infra Red (PIR) sensors
­ Detects movement in an area
­ PIR sensors are used in burglar alarms as they can
sense if someone is present is a room
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Types of Sensors
· Contact sensor/switch
­ A switch has two parts that need to be in contact with
each other
­ Contact between the two parts is broken if they are
moved too far apart
­ Used in burglar alarms and security systems
· Geiger counters can be used to measure the
amount of radioactivity
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