What does digital mean?

Let's define precisely what the digital term means here.

Digital and analog concepts

Digital, in the computer and electronic worlds, means discrete, which is the opposite of analog/continuous. It is also a mathematical definition. We often talk about domains to define the cases for use of digital and analog.

Usually, the analog domain is the domain related to physical measures. Our temperature can have all the values that are possible and that exist, even if our measuring equipment dosen't have an infinite resolution.

The digital domain is the one of computers. Because of the encoding and finite memory size, computers translates analog/continuous values into digital representations.

On a graph, this could be visualized as follows:

Inputs and outputs of Arduino

Arduino owns inputs and outputs. We can also distinguish analog and digital pins.

You have to remember the following points:

• Arduino provides digital pins that can be both an input or an output

• Arduino provides only analog...