onoff

digitalWrite(2, HIGH);   // turn on LED on pin 2
delay(del);              // wait (length determined by value of ‘del’)
digitalWrite(2, LOW);    // turn it off
digitalWrite(3, HIGH);   // turn on LED on pin 3
delay(del);              // wait
digitalWrite(3, LOW);    // turn it off
digitalWrite(4, HIGH);   // turn on LED on pin 4
delay(del);              // wait
digitalWrite(4, LOW);    // turn it off
digitalWrite(5, HIGH);   // turn on LED on pin 5
delay(del);              // wait
digitalWrite(5, LOW);    // turn it off
digitalWrite(6, HIGH);   // turn on LED on pin 6
delay(del);              // wait
digitalWrite(6, LOW);    // turn it off
digitalWrite(7, HIGH);   // turn on LED on pin 7
delay(del);              // wait
digitalWrite(7, LOW);    // turn it off
digitalWrite(8, HIGH);   // turn on LED on pin 8
delay(del);              // wait
digitalWrite(8, LOW);    // turn it off
digitalWrite(9, HIGH);   // turn on LED on pin 9
delay(del);              // wait
digitalWrite(9, LOW);    // turn it off