#define B1 13 //Corresponde a R (LED Vermelho)
#define B2 18 //Corresponde a G (LED verde)
#define B3 19 //Corresponde a B (LED azul)
To save yourself in future, think about including the comment in the literal name.
So, instead of B1, how about
#define LEDVermelho 13
.
In that way, your code is much easier to read.