Music Player With OLED Screen

1#include <Wire.h>
2#include <Adafruit_GFX.h>
3#include <Adafruit_SSD1306.h>
4#include <SoftwareSerial.h>
5#include <DFRobotDFPlayerMini.h>
6
7/******** OLED ********/
8#define SCREEN_WIDTH 128
9#define SCREEN_HEIGHT 64
10#define OLED_RESET -1
11#define OLED_ADDR 0x3C
12
13Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);
14
15/******** DFPLAYER ********/
16SoftwareSerial dfSerial(10, 11); // TX, RX
17DFRobotDFPlayerMini dfPlayer;
18
19/******** BUTTONS ********/
20const int btnNext = 2;
21const int btnPlayPause = 3;
22const int btnPrev = 4;
23
24/******** STATE ********/
25bool isPlaying = false;
26int currentTrack = 1;
27
28/******** BUTTON EDGE STATES ********/
29bool lastNextState = HIGH;
30bool lastPrevState = HIGH;
31bool lastPlayState = HIGH;
32
33/******** SETUP ********/
34void setup() {
35  pinMode(btnNext, INPUT_PULLUP);
36  pinMode(btnPlayPause, INPUT_PULLUP);
37  pinMode(btnPrev, INPUT_PULLUP);
38
39  Serial.begin(9600);
40  dfSerial.begin(9600);
41
42  // OLED
43  if (!display.begin(SSD1306_SWITCHCAPVCC, OLED_ADDR)) {
44    while (true);
45  }
46
47  // DFPlayer
48  if (!dfPlayer.begin(dfSerial)) {
49    showError("DFPlayer FAIL");
50    while (true);
51  }
52
53  dfPlayer.volume(20);
54  delay(500);
55
56  dfPlayer.play(1);
57  isPlaying = true;
58  delay(300);
59
60  currentTrack = dfPlayer.readCurrentFileNumber();
61  updateOLED();
62}
63
64/******** LOOP ********/
65void loop() {
66  handleButtons();
67}
68
69/******** BUTTON HANDLING ********/
70void handleButtons() {
71  bool nextState = digitalRead(btnNext);
72  bool prevState = digitalRead(btnPrev);
73  bool playState = digitalRead(btnPlayPause);
74
75  if (lastNextState == HIGH && nextState == LOW) {
76    nextTrack();
77  }
78
79  if (lastPrevState == HIGH && prevState == LOW) {
80    prevTrack();
81  }
82
83  if (lastPlayState == HIGH && playState == LOW) {
84    togglePlayPause();
85  }
86
87  lastNextState = nextState;
88  lastPrevState = prevState;
89  lastPlayState = playState;
90}
91
92/******** PLAYER CONTROLS ********/
93void nextTrack() {
94  dfPlayer.next();
95  delay(300); // DFPlayer needs time
96  currentTrack = dfPlayer.readCurrentFileNumber();
97  isPlaying = true;
98  updateOLED();
99}
100
101void prevTrack() {
102  dfPlayer.previous();
103  delay(300);
104  currentTrack = dfPlayer.readCurrentFileNumber();
105  isPlaying = true;
106  updateOLED();
107}
108
109void togglePlayPause() {
110  if (isPlaying) {
111    dfPlayer.pause();
112    isPlaying = false;
113  } else {
114    dfPlayer.start();
115    isPlaying = true;
116  }
117  updateOLED();
118}
119
120/******** OLED ********/
121void updateOLED() {
122  display.clearDisplay();
123  display.setTextSize(1);
124  display.setTextColor(SSD1306_WHITE);
125
126  display.setCursor(0, 0);
127  display.println("DFPlayer Mini");
128
129  display.setCursor(0, 20);
130  display.print("Track: ");
131  display.println(currentTrack);
132
133  display.setCursor(0, 40);
134  display.print("Status: ");
135  display.println(isPlaying ? "Playing" : "Paused");
136
137  display.display();
138}
139
140void showError(const char* msg) {
141  display.clearDisplay();
142  display.setCursor(0, 30);
143  display.println(msg);
144  display.display();
145}