int ledler[]= {D2,D3,D4,D5,D6}; void setup() { for(int i=0; i<6; i++){ pinMode(ledler[i], OUTPUT); } } void loop() { for(int i=0; i<6; i++){ digitalWrite(ledler[i], HIGH); delay(100); digitalWrite(ledler[i], LOW); } for(int x=5; x>-1; x--){ digitalWrite(ledler[x], HIGH); delay(100); digitalWrite(ledler[x], LOW); } }