int dt=200;
void setup()
{
pinMode(2, OUTPUT);
pinMode(3, OUTPUT);
pinMode(4, OUTPUT);
pinMode(5, OUTPUT);
pinMode(6, OUTPUT);
pinMode(7, OUTPUT);
pinMode(8, OUTPUT);
pinMode(9, OUTPUT);
}
void loop()
{
digitalWrite(9,1);
delay(dt);
digitalWrite(8,1);
delay(dt);
digitalWrite(7,1);
delay(dt);
digitalWrite(6,1);
delay(dt);
digitalWrite(9,0);
delay(dt);
digitalWrite(8,0);
delay(dt);
digitalWrite(7,0);
delay(dt);
digitalWrite(6,0);
delay(dt);
digitalWrite(5,1);
delay(dt);
digitalWrite(4,1);
delay(dt);
digitalWrite(3,1);
delay(dt);
digitalWrite(2,1);
delay(dt);
digitalWrite(5,0);
delay(dt);
digitalWrite(4,0);
delay(dt);
digitalWrite(3,0);
delay(dt);
digitalWrite(2,0);
delay(dt);























}