Watch the two following videos, here is the code. int led1Pin=1; int led2Pin=2; int led3Pin=3; int led4Pin=4; int led5Pin=5; int led6Pin=6; int led7Pin=7; int led8Pin=8; int led9Pin=9; voidsetup() { pinMode(led1Pin, OUTPUT); pinMode(led2Pin, OUTPUT); pinMode(led3Pin, OUTPUT); pinMode(led4Pin, OUTPUT); pinMode(led5Pin, OUTPUT); pinMode(led6Pin, OUTPUT); pinMode(led7Pin, OUTPUT); pinMode(led8Pin, OUTPUT); pinMode(led9Pin, OUTPUT); } voidloop() { digitalWrite(led1Pin, HIGH); delay(100); digitalWrite(led1Pin, LOW); digitalWrite(led2Pin, HIGH); delay(100); digitalWrite(led2Pin, LOW); digitalWrite(led3Pin, HIGH); delay(100); digitalWrite(led3Pin, LOW); digitalWrite(led4Pin, HIGH); delay(100); digitalWrite(led4Pin, LOW); digitalWrite(led5Pin, HIGH); delay(100); digitalWrite(led5Pin, LOW); digitalWrite(led6Pin, HIGH); delay(100); digitalWrite(led6Pin, LOW); digitalWrite(led7Pin, HIGH); delay(100); digitalWrite(led7Pin, LOW); digitalWrite(led8Pin, HIGH); delay(100); digitalWrite(led8Pin, LOW); digitalWrite(led9Pin, HIGH); delay(100); digitalWrite(led9Pin, LOW); }