Arduino Code #3

int redPin = 12; // Red LED connected to digital pin 12
int greenPin = 13; // Green LED connected to digital pin 11

void setup() // run once, when the sketch starts
{
pinMode(redPin, OUTPUT); // sets the digital pin as output
pinMode(greenPin, OUTPUT); // sets the digital pin as output
}

void loop() // run over and over again
{
digitalWrite(redPin, HIGH); // sets the Red LED on
digitalWrite(greenPin, HIGH); // sets the Green LED on
delay(500); // waits for half a second
digitalWrite(redPin, HIGH); // sets the Red LED on
digitalWrite(greenPin, LOW); // sets the Green LED off
delay(500); // waits for half a second
digitalWrite(redPin, LOW); // sets the Red LED off
digitalWrite(greenPin, LOW); // sets the Green LED off
delay(500); // waits for half a second
digitalWrite(redPin, LOW); // sets the Red LED off
digitalWrite(greenPin, HIGH); // sets the Green LED on
delay(500); // waits for half a second
}

This is a more refined version of the LED blinking program that we made. It blinks 2 LEDs in an alternating on/off sequence.