int pinarr[]={
2,3,4,5,

};

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


}

void loop() {
  // put your main code here, to run repeatedly:
for(int i = 0; i<4; i++)
{

digitalWrite(pinarr[i], HIGH);

delay(200);
}

}