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	- Project: LED MP3 Controller
	- Source Code NOT compiled for: Arduino Nano
	- Source Code created on: 2024-08-02 11:51:47

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/****** SYSTEM REQUIREMENTS *****/
/****** SYSTEM REQUIREMENT 1 *****/
	/* On button, fire led rapidly 3 times and trigger an */
	/* mp3 . Don’t use easy button */
/****** END SYSTEM REQUIREMENTS *****/

/****** DEFINITION OF LIBRARIES *****/
#include <SoftwareSerial.h>
#include <DFRobotDFPlayerMini.h>  // https://github.com/DFRobot/DFRobotDFPlayerMini

/****** FUNCTION PROTOTYPES *****/
void setup(void);
void loop(void);
void updateOutputs(void);
void handleButtonPress(void);

/***** DEFINITION OF DIGITAL INPUT PINS *****/
const uint8_t Button_PushButton_PIN_D2 = 2;

/***** DEFINITION OF DIGITAL OUTPUT PINS *****/
const uint8_t Led_LED_PIN_D3 = 3;

/***** DEFINITION OF Software Serial *****/
const uint8_t Player_DFPlayerMini_Serial_PIN_SERIAL_TX_A0 = A0;
const uint8_t Player_DFPlayerMini_Serial_PIN_SERIAL_RX_A1 = A1;
SoftwareSerial Player_DFPlayerMini_Serial(Player_DFPlayerMini_Serial_PIN_SERIAL_RX_A1, Player_DFPlayerMini_Serial_PIN_SERIAL_TX_A0);

/****** DEFINITION OF OUTPUT RAW VARIABLES *****/
/***** used to store raw data *****/
bool Led_LED_PIN_D3_rawData = 0;

/****** DEFINITION OF LIBRARIES CLASS INSTANCES *****/
DFRobotDFPlayerMini myDFPlayer;  // Instance of the DFPlayer Mini class

void setup(void)
{
    // put your setup code here, to run once:
    pinMode(Button_PushButton_PIN_D2, INPUT_PULLUP); // Set button pin as input with pull-up resistor
    pinMode(Led_LED_PIN_D3, OUTPUT); // Set LED pin as output

    // Initialize the software serial for the DFPlayer Mini
    Player_DFPlayerMini_Serial.begin(9600);

    // Initialize the DFPlayer Mini
    if (!myDFPlayer.begin(Player_DFPlayerMini_Serial, true, true)) {  // Use serial to communicate with mp3
        Serial.println(F("Unable to begin:"));
        Serial.println(F("1. Please recheck the connection!"));
        Serial.println(F("2. Please insert the SD card!"));
        while (true);  // Stay here if initialization fails
    }
    Serial.println(F("DFPlayer Mini online."));

    myDFPlayer.setTimeOut(500); // Set serial communication timeout to 500ms
    myDFPlayer.volume(10);  // Set volume value (0~30)
}

void loop(void)
{
    // put your main code here, to run repeatedly:
    updateOutputs(); // Refresh output data
    handleButtonPress(); // Check for button press
}

void updateOutputs()
{
    digitalWrite(Led_LED_PIN_D3, Led_LED_PIN_D3_rawData); // Update LED state
}

void handleButtonPress()
{
    // Check if the button is pressed (active low)
    if (digitalRead(Button_PushButton_PIN_D2) == LOW) {
        // Fire LED rapidly 3 times
        for (int i = 0; i < 3; i++) {
            Led_LED_PIN_D3_rawData = HIGH; // Turn on LED
            updateOutputs(); // Update LED state
            delay(100); // Wait for 100 milliseconds
            Led_LED_PIN_D3_rawData = LOW; // Turn off LED
            updateOutputs(); // Update LED state
            delay(100); // Wait for 100 milliseconds
        }
        // Trigger an MP3 file (e.g., play the first mp3)
        myDFPlayer.play(1); // Play the first mp3
        delay(1000); // Debounce delay to prevent multiple triggers
    }
}

/* END CODE */