Writing code to react to a press

Before we go into the details of the programming of such a circuit, we'll have to decide what behavior we will unchain in our project once the event of a press is detected. For the sake of simplicity, we will make an LED blink or fade depending on the press of the button.

This way, we can test all that we have already learned in a simple example and this will also lead us to meet another very important control structure of any programming language, called a conditional bifurcation, which some say is the basic structure that makes any program a logical structure and not a simple sequence of instructions.

Once the circuit is assembled, let's take a look at the code we are going to write to detect and react to the button press as a digital input. Here, you have the complete code for this example:

/*
 Chapter 05 - Sensing the real world through digital inputs
 Sensing a switch
 By Francis Perea for Packt Publishing
*/

// Global variables we will use
int led = 9...