//This arduino sketch blinks red, green, then blue every time the button is pressed

//Note that in this software the RGB LED has a common "anode",
//meaning the common pin goes to positive rather than negative.
//In this case HIGH turns the LED off and LOW turns it on
//In your kits, the RGB LED is common "cathode", meaning
//the common pin goes to negative (GND pin). 

//This is the same sketch as before, but we are going to use variables
//in order to make it more readable.

//Here we declare the variables:
int red = 5;
int green = 6;
int blue = 7;

int button = 2;


void setup() {
  pinMode(red, OUTPUT); //Instead of using numbers to refer to the LED pins,
  pinMode(green, OUTPUT); //We use the variables we just declared
  pinMode(blue, OUTPUT);

  digitalWrite(red, HIGH);  //Turn the LEDs off to start with
  digitalWrite(green, HIGH);
  digitalWrite(blue, HIGH);

  pinMode(button, INPUT_PULLUP); //The button is attached to pin 2, so we set pin 2 as input
}

void loop() {

  if(digitalRead(button) == LOW)   //If the button is pushed:
  {
    digitalWrite(red, LOW);     //Turn red LED on
    delay(300);               //Wait 300ms
    digitalWrite(red, HIGH);    //Turn red LED off
    digitalWrite(green, LOW);     //Turn blue LED on
    delay(300);               //Wait 300ms
    digitalWrite(green, HIGH);    //Turn blue LED off
    digitalWrite(blue, LOW);     //Turn green LED on
    delay(300);               //Wait 300ms
    digitalWrite(blue, HIGH);    //Turn green LED off
  }

}