const int DriverA_1 = 0;
const int DriverA_2 = 1;
const int DriverB_1 = 2;
const int DriverB_2 = 3;

void setup() {
  pinMode(DriverA_1, OUTPUT);
  pinMode(DriverA_2, OUTPUT);
  pinMode(DriverB_1, OUTPUT);
  pinMode(DriverB_2, OUTPUT);

}

void loop() {
  motor( HIGH,  LOW, 1);
}

void motor(int a1, int a2, int d){
  digitalWrite(DriverA_1, a1);
  digitalWrite(DriverA_2, a2);
  delay(d);
  digitalWrite(DriverB_1, a1);
  digitalWrite(DriverB_2, a2);
  delay(d);  
  digitalWrite(DriverA_1, a2);
  digitalWrite(DriverA_2, a1);
  delay(d);  
  digitalWrite(DriverB_1, a2);
  digitalWrite(DriverB_2, a1);
  delay(d);

}