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); }