How data is logged

A sensor can be attached...

1. to a data collection device that stores data directly to a computer
2. to a transmitter

The data may be strored and processed later. The processing can be carried by using either spreadsheet or special software.

Telemetry is the use of telecommunications to transmit live data. Readings can easily be taken in remite or fast-moving locations and the results obtained immediately. In motor races, sensors on the cars transmit live data to the engineers about many things such as tyre temperatures , fuel, speed and gear canges.
The software that processes recorded data can display it in an easy-to-understand way. This is visualisation. The data can be used instantly to plot charts and create tables.

Advantages & desadvantages of data logging

Data logging is particulary useful in scientificnand envviromental research. It can be used to detect earthquakes and warn of possible tsunamis.
Data loggin can be combined with GPS technology to monitor the migratuins of animals such as walruses. It can also monitor changes in temperature and pressure in a explosion.
Advantages:

• More acurate than human data recording
• Can monitor data 24/7
• Can feed straight into a computer system for processing or storage
• Can collect data in difficult, dangerous or remote locations.

Disadvantages

• Can be inflexible
• Might miss new opportunities if the system is not prograammed for them

Data logging

Computers can take their input from all sorts of devices. They use input from sensors  in control applications. They can store and process data which us carry investigations.

Sensors take physical data and convert it to electrical signals. The electrical signals can then be converted into digital signals and fed into a computer.

Physical Data type and some examples

There are sensors for every type of physical data.
This makes it posible to record most events:
  
Physical Data type             Example of data Logging

Electrical                            Taxi meter, Traffic lights.

Pressure                              Burglar alarm, Traffic census.

pH                                      Adicity of a chemical in manufacturing.

Light                                  Biometrics-authentication at airports, counting preople.

Magnetic                           Security door access crontrol.

Temperature                      Weather station.