int main ()
{
    gpioInitialise();
    Motor front (18);
	Motor left (23);
	Motor right (24);
	Motor back (25);
    sleep(1);
    
	int i = 40;
	
    front.set(i);
    left.set(i);
    right.set(i);
    back.set(i);
    cout << "speed:" << i << "\n";
    sleep(2);

	i = 20;
	
    front.set(i);
    left.set(i);
    right.set(i);
    back.set(i);
    cout << "speed:" << i << "\n";
    sleep(2);

    front.set(0);
    left.set(0);
    right.set(0);
    back.set(0);
    gpioTerminate();
	sleep(1);
}