//This code (1) illuminates the specified on-board LED for the Seeed Studio Xiao RP2040, (2) prints the specified phrase, and (3) prints user-specified characters

//Code produced by Shea Landeene for HTMAA 2023

// define LED pin [green=16; red=17; blue=25]
#define PIN 25

// define time to initiate chip:program communication (arbitrary when physically connected by cable)
#define BEGIN_SPEED 9600

// define time delay between commands (arbitrary when physically connected by cable)
#define DELAY_SPEED 500

// uncomment following line to run command for printing specified phrase 
// #define PRINT_PHRASE

// uncomment following line to run command for printing letters based on user input
// #define PRINT_LETTERS


void setup() {
  // put your setup code here, to run once:
  pinMode(PIN, OUTPUT);
  Serial.begin(BEGIN_SPEED);

}

void loop() {
  // put your main code here, to run repeatedly:
  // turn LED on
  digitalWrite(PIN, HIGH);
  delay(DELAY_SPEED);
  // turn LED off
  digitalWrite(PIN, LOW);
  delay(DELAY_SPEED);

  #ifdef PRINT_PHRASE
  // print specified phrase 
  Serial.println("hello world");
  #endif

  #ifdef PRINT_LETTERS
  // print specified letters based on user input 
  if (Serial.available()) {
    char c = Serial.read();
    Serial.print("Letter:");
    Serial.println(c);
    Serial.println("Please enter next letter");
  }
  #endif

}