/////////////////////////////////////
////////////// RGB LED //////////////
/////////////////////////////////////

//////////////////////////////
//VARIABLES AND DEFINITIONS //
//////////////////////////////
#define RED 1
#define GREEN 5
#define BLUE 9

///////////
// SETUP //
///////////

void setup() {
  // put your setup code here, to run once:
  Serial1.begin(115200);
  Serial1.println("Hello, Raspberry Pi Pico!");
  pinMode(RED, OUTPUT);
  pinMode(GREEN, OUTPUT);
  pinMode(BLUE, OUTPUT);
}

///////////////
// FUNCTIONS //
///////////////

void off() {
  digitalWrite(RED, LOW);
  digitalWrite(GREEN, LOW);
  digitalWrite(BLUE, LOW);
}

void red() {
  digitalWrite(RED, HIGH);
}

void yellow() {
  digitalWrite(RED, HIGH);
  digitalWrite(GREEN, HIGH);
}

void green() {
  digitalWrite(GREEN, HIGH);
}

void blue() {
  digitalWrite(BLUE, HIGH);
}

//////////
// LOOP //
//////////

void loop() {
  // put your main code here, to run repeatedly:
  off();
  red();
  delay(100);
  off();
  yellow();
  delay(100);
  off();
  green();
  delay(100);
  off();
  blue();
  delay(100);
}