/*wokat-project "led running light ard_nano_1"*/
int d = 75;
void setup()
{ pinMode(2, OUTPUT);
  pinMode(3, OUTPUT);
  pinMode(4, OUTPUT);
  pinMode(5, OUTPUT);
  pinMode(6, OUTPUT);
  pinMode(7, OUTPUT);
  pinMode(8, OUTPUT);}
void loop()
{ for ( int a = 2; a < 9 ; a++ )
{ digitalWrite(a, HIGH);
  delay(d);
  digitalWrite(a, LOW);
  delay(d);}
{ for ( int a = 7; a > 2 ; a-- )
{ digitalWrite(a, HIGH);
  delay(d);
  digitalWrite(a, LOW);
  delay(d);}
  }}