const int l293bPin[] =  {2,3,4,5};
int ledpin =13;
void setup()   {
 for (int i=0;i<4;i++){
  pinMode(l293bPin[i], OUTPUT);
 }
}
void loop()
{
destrA();
digitalWrite(ledpin,HIGH);//serve per discriminare le varie sequenze :D
delay(1000);
fermo();
digitalWrite(ledpin,LOW);
delay(1000);
sinistrA();
delay(1000);
fermo();
delay(1000);
destrO();
delay(1000);
fermo();
delay(1000);
sinistrO();
delay(1000);
fermo();
delay(1000);
avanti();
delay(1000);
fermo();
delay(1000);
indietro();
delay(1000);
fermo();
delay(1000);

}
void controllo(int a,int b, int c, int d){
  analogWrite(l293bPin[0],a);
  analogWrite(l293bPin[1],b);
  analogWrite(l293bPin[2],c);
  analogWrite(l293bPin[3],d);
}

void destrA(){
  controllo(1023,0,0,0);// destra antiorario
 }
void sinistrO(){
  controllo(0,0,1023,0);// sinistro orario
 }
void sinistrA(){
  controllo(0,0,0,1023);// sinistro antiorario
}
void destrO(){
  controllo(0,1023,0,0);// destro orario
 }

void fermo(){
  controllo(0,0,0,0);// fermo
}
void avanti(){
  controllo(1023,0,0,1023);
}
void indietro(){
  controllo(0,1023,1023,0);
}