//https://docs.arduino.cc/built-in-examples/control-structures/Arrays/


int timer = 250;

void setup() {
  // for loop initializing each pin as an output
  for (int ledPin = 2; ledPin <8; ledPin++){
    pinMode(ledPin, OUTPUT);
  }

}

void loop() {
  // for loop to output from lowest pin to highest
  for (int ledPin = 2; ledPin < 8; ledPin++){
    //turn the pin on:
    digitalWrite(ledPin, HIGH);
    delay(timer);
    //turn the pin off:
    digitalWrite(ledPin, LOW);
  }

}