Simple code to make a LED chaser
int i; void setup() { for(i=5;i<=8;i++) pinMode(i,OUTPUT);
}
void loop() { for(i=5;i<=8;i++) { if(i!=8) { digitalWrite(i,HIGH); digitalWrite(i+1,HIGH); delay(500); digitalWrite(i,LOW); digitalWrite(i+1,LOW); } else { digitalWrite(i,HIGH); digitalWrite(i-3,HIGH); delay(500); digitalWrite(i,LOW); digitalWrite(i-3,LOW); } } }