Analog Demystified
To get our heads around the concept of what analog is, we should compare the difference between analog and digital signals beginning with Figure 6-1.
Figure 6-1. Digital versus analog signals
Looking at these two graphs that show the effect of the different signals types over time, you can see that where a digital signal abruptly shifts from high to low, an analog signal can gradually move through a multitude of steps in between these two extremes. This varying, or analog signal, is what we can use to determine how cold it is, how much pressure is being exerted, or to change the brightness of a light or the speed of a motor. ...
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