#include <SoftwareSerial.h>
#include <DFRobotDFPlayerMini.h>

#define DFPLAYER_RX 2  // PA1 - connect to DFPlayer TX
#define DFPLAYER_TX 3  // PA2 - connect to DFPlayer RX
#define TILT_PIN 4     // PA3 - one leg to GND
#define LED_PIN 0      // PA7 - LED anode, cathode to GND via resistor

SoftwareSerial mySerial(DFPLAYER_RX, DFPLAYER_TX);
DFRobotDFPlayerMini dfplayer;

bool playing = false;

void setup() {
  pinMode(TILT_PIN, INPUT_PULLUP);  // Tilt switch with internal pull-up
  pinMode(LED_PIN, OUTPUT);         // LED pin
  digitalWrite(LED_PIN, HIGH);      // LED on by default

  mySerial.begin(9600);
  if (!dfplayer.begin(mySerial)) {
    // DFPlayer failed to initialize
    while (true);  // Halt here, maybe blink LED if needed
  }

  dfplayer.volume(20);  // Set volume (0 to 30)
}

void loop() {
  bool tilted = digitalRead(TILT_PIN) == LOW;

  if (tilted && !playing) {
    dfplayer.play(1);           // Play 001.mp3
    digitalWrite(LED_PIN, LOW); // Turn off LED
    playing = true;
  } else if (!tilted && playing) {
    dfplayer.stop();            // Stop music
    digitalWrite(LED_PIN, HIGH); // Turn on LED
    playing = false;
  }

  delay(200);  // debounce delay
}