Build an LED Sequencer

In this lesson we will build an LED Sequencer

This circuit connects 4 digital output pins to LEDs. When the digital output connected to an LED is set high, the LED lights up.

Above is a picture of the circuit on a breadboard. At the moment this photo was taken, output D3 on the microcontroller was set high, and the second LED from the left is lit up.

Here is a program you can use to test the LED sequencer.

void setup()

{

  pinMode(2, OUTPUT);

  pinMode(3, OUTPUT);

  pinMode(4, OUTPUT);

  pinMode(5, OUTPUT);

}

int position;

void loop()

{

  digitalWrite(position + 2, HIGH);

  delay(100);

  digitalWrite(position + 2, LOW);

  delay(100);

  position = position + 1;

  if (position > 3)

  {

    position = 0;

  }

}

Can you add another LED to the sequencer? What steps do you need to take?