byte btn, lastBtn = 1, led;
void setup()
{
DDRD = DDRD | B11110000;
}
void loop()
{
btn = (PIND & B00001100) >> 2;
if(lastBtn != btn)
{
lastBtn = btn;
switch(btn)
{
case 0:
PORTD = B00010000;
break;
case 1:
PORTD = B00100000;
break;
case 2:
PORTD = B01000000;
break;
case 3:
PORTD = B10000000;
break;
}
}
}