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Analogue Data

Many electronic sensors provide signals in analogue form. For example, a microphone provides an electrical 'copy' of a sound wave.

Here is the circuit diagram for a temperature sensor.

The output voltage from this increases when the temperature increases. It is an analogue signal because the voltage copies the behaviour of the temperature.

The analogue signal can have any voltage value, limited only by the power supply used.

In this case, the output of the temperature sensor could, in theory, go as high as 5V, or as low as 0V with many readings in between.

Over a period of time, the output voltage could change as follows:

This is an analogue signal.