Sensors and data logging
Lesson5
2011-2012
What is a sensor
A sensor is a piece of equipment that senses or monitors something.
Example : thermometer which is temperature sensors
There are two different types of sensor:
1- Analogue sensors 2- Digital sensors
Analogue sensorIt can measure over
continuous range and their readings may form a curve
Example mercury thermometer
Digital sensorIt jumps between values,
though if the steps are small, they may not be detected by the human eye.
Example: modern desk weather systems
Mercury thermometer
Weather systems
Analogue to digital convertorIf an analogue sensor is used as a computer input ,a device must be used to
convert the analogue signal to a digital format. This device is known as
Analogue to digital convertor
Datalogging
When sensors are attached to a computer that records readings at intervals over time, this is known as datalogging.
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