////////////////////////////////////////////////////////////////////////////////////////////
// DEFINES AND MACROS AND CONSTANTS
////////////////////////////////////////////////////////////////////////////////////////////

//pins for buttons
const int BLUE_BUTTON_PIN = 7;
const int GREEN_BUTTON_PIN = 6;
const int RED_BUTTON_PIN = 5;
const int YELLOW_BUTTON_PIN = 4;

//pins for LEDS
const int BLUE_LED_PIN = 13;
const int GREEN_LED_PIN = 12;
const int RED_LED_PIN = 11;
const int YELLOW_LED_PIN = 10;

//pins for buzzer
const int BUZZER_PIN = 2;

//tones for colors
const unsigned short BLUE_TONE = 415;
const unsigned short GREEN_TONE = 310;
const unsigned short RED_TONE = 252;
const unsigned short YELLOW_TONE = 209;

////////////////////////////////////////////////////////////////////////////////////////////
// GLOBALS
////////////////////////////////////////////////////////////////////////////////////////////



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

void setup() {
  // put your setup code here, to run once:

  //initialize LEDs pins
  pinMode(BLUE_LED_PIN, OUTPUT);
  pinMode(GREEN_LED_PIN, OUTPUT);
  pinMode(RED_LED_PIN, OUTPUT);
  pinMode(YELLOW_LED_PIN, OUTPUT);

  //initialize button pins
  pinMode(BLUE_BUTTON_PIN, INPUT);
  pinMode(GREEN_BUTTON_PIN, INPUT);
  pinMode(RED_BUTTON_PIN, INPUT);
  pinMode(YELLOW_BUTTON_PIN, INPUT);

  //initialize buzzer pin
  pinMode(BUZZER_PIN, OUTPUT);

  //init serial port
  Serial.begin(115200);

  Serial.write("\n\rPINs initialized");
}

void loop() {
  // put your main code here, to run repeatedly:

  //read blue button input
  if (!digitalRead(BLUE_BUTTON_PIN)) {
    digitalWrite(BLUE_LED_PIN, HIGH);
    Serial.write("\n\rBlue button pressed");
    //play tone
    tone(BUZZER_PIN, BLUE_TONE, 500);    
  } else {
    digitalWrite(BLUE_LED_PIN, LOW);
  }

  //read green button input
  if (!digitalRead(GREEN_BUTTON_PIN)) {
    digitalWrite(GREEN_LED_PIN, HIGH);
    Serial.write("\n\rGreen button pressed");
    //play tone
    tone(BUZZER_PIN, GREEN_TONE, 500);    
  } else {
    digitalWrite(GREEN_LED_PIN, LOW);
  }

  //read red button input
  if (!digitalRead(RED_BUTTON_PIN)) {
    digitalWrite(RED_LED_PIN, HIGH);
    Serial.write("\n\rRed button pressed");
    //play tone
    tone(BUZZER_PIN, RED_TONE, 500);    
  } else {
    digitalWrite(RED_LED_PIN, LOW);
  }

  //read yellow button input
  if (!digitalRead(YELLOW_BUTTON_PIN)) {
    digitalWrite(YELLOW_LED_PIN, HIGH);
    Serial.write("\n\rYellow button pressed");
    //play tone
    tone(BUZZER_PIN, YELLOW_TONE, 500);
  } else {
    digitalWrite(YELLOW_LED_PIN, LOW);
  }

}