void setup() {
  // put your setup code here, to run once:
Serial.begin(9600);
pinMode(2, OUTPUT);
pinMode(3, OUTPUT);
pinMode(4, OUTPUT);
pinMode(5, OUTPUT);

 //for (int i = 0; i <5; i++) {
  int i = 0;
  while(i<5){
   Serial.print("i รอบที่ :");  
   Serial.println(i);
   i=i+1;
 }

  
}

void loop() {
  // put your main code here, to run repeatedly:

}