Here's a great 6 LED chaser effect from HERE:

#include <avr/io.h> #include "../libnerdkits/delay.h" #define F_CPU 14745600 // 6 led chaser - PC0-5 main() { int i; DDRC = 0x3F; while(1) { for (i=0; i <= 5; i++) { PORTC = (1 << i); // so PORTC = 0,1,2,4 delay_ms(50); } for (i=5; i >= 0; i--) { PORTC = (1 << i); // so PORTC = 0,1,2,4 delay_ms(50); } } }