NodeMCU MP3 Player with Display and Buttons

Ever wanted to build an MP3 player yourself? It's easy. Put the parts together, flash the code, and be happy.

Jan 28, 2022

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Components and supplies

NodeMCU ESP8266 Breakout Board

Jumper wires (generic)

6x6x4.30mm Buttons

DFPlayer Mini

0,91 Zoll OLED I2C Display 128 x 32 Pixel

Apps and platforms

Arduino IDE

Project description

Code

NodeMCU MP3 Player with Display and buttons

c_cpp

Just Paste into your IDE and flash your NodeMCU

1#include "DFRobotDFPlayerMini.h"
2#include <SPI.h>
3#include <Wire.h>
4#include   <U8g2lib.h>
5
6#if !defined(UBRR1H)
7#include <SoftwareSerial.h>
8SoftwareSerial   mySerial(D7, D8); // RX, TX
9#endif
10
11#define BUTTON_PIN_pause  D3     //   Play_Pause Button
12#define BUTTON_PIN_playnext  D5     // Next Button
13#define   BUTTON_PIN_volumeUp  D4     // VolUp Button
14#define BUTTON_PIN_volumeDown  D6      // VolDown Button
15
16#define SCREEN_WIDTH 128 // OLED display width, in   pixels
17#define SCREEN_HEIGHT 32 // OLED display height, in pixels
18#define   OLED_RESET     -1 // Reset pin # (or -1 if sharing Arduino reset pin)
19#define   SCREEN_ADDRESS 0x3C ///< See datasheet for Address; 0x3D for 128x64, 0x3C for 128x32
20U8X8_SSD1306_128X32_UNIVISION_SW_I2C   u8x8(/* clock=D1*/ 5, /* data=D2*/ 4);
21
22boolean oldState_pause = HIGH;
23boolean   oldState_playnext = HIGH;
24boolean oldState_volumeUp = HIGH;
25boolean oldState_volumeDown   = HIGH;
26
27int mode     = 0;    // Currently-active action mode
28int playstate   = 0;
29int test = 0;
30int tracks = 0;
31int currtrack = 0;
32int currvol =   0;
33int volume = 0;
34int volumeunder = 0;
35int volumeover = 0;
36DFRobotDFPlayerMini   myDFPlayer;
37
38void setup()
39{
40  pinMode(BUTTON_PIN_pause, INPUT_PULLUP);
41   pinMode(BUTTON_PIN_playnext, INPUT_PULLUP);
42  pinMode(BUTTON_PIN_volumeUp,   INPUT_PULLUP);
43  pinMode(BUTTON_PIN_volumeDown, INPUT_PULLUP);
44  Serial.begin(115200);
45
46#if   !defined(UBRR1H)
47  mySerial.begin(9600);
48  myDFPlayer.begin(mySerial, true);
49#else
50   Serial1.begin(9600);
51  myDFPlayer.begin(Serial1, true);
52#endif
53  delay(1000);
54
55   myDFPlayer.outputDevice(DFPLAYER_DEVICE_SD);
56
57  u8x8.begin();
58  Serial.println(u8x8.getRows());
59   u8x8.setBusClock(400000);
60
61  Serial.println("Setting volume to 15");
62   myDFPlayer.volume(15);
63  delay(100);
64  currvol = myDFPlayer.readVolume();
65   Serial.println(currvol);
66  Lautstaerke();
67  Track();
68  delay(100);
69}
70
71void   loop()
72{
73  boolean newState_pause = digitalRead(BUTTON_PIN_pause);
74  boolean   newState_playnext = digitalRead(BUTTON_PIN_playnext);
75  boolean newState_volumeUp   = digitalRead(BUTTON_PIN_volumeUp);
76  boolean newState_volumeDown = digitalRead(BUTTON_PIN_volumeDown);
77
78   // Play_Pause Button
79  if ((newState_pause == LOW) && (oldState_pause == HIGH))   {
80    // Short delay to debounce button.
81    delay(20);
82    // Check if   button is still low after debounce.
83    newState_pause = digitalRead(BUTTON_PIN_pause);
84     if (newState_pause == LOW) {     // Yes, still low
85      mode = 1; // Set   mode for Switch
86    }
87  }
88  // Play Next Button
89  if ((newState_playnext   == LOW) && (oldState_playnext == HIGH)) {
90    // Short delay to debounce button.
91     delay(20);
92    // Check if button is still low after debounce.
93    newState_playnext   = digitalRead(BUTTON_PIN_playnext);
94    if (newState_playnext == LOW) {     //   Yes, still low
95      mode = 2; // Set mode for Switch
96    }
97  }
98  //   volumeDown Button
99  if ((newState_volumeDown == LOW) && (oldState_volumeDown   == HIGH)) {
100    // Short delay to debounce button.
101    delay(20);
102    //   Check if button is still low after debounce.
103    newState_volumeDown = digitalRead(BUTTON_PIN_volumeDown);
104     if (newState_volumeDown == LOW) {     // Yes, still low
105      mode = 3; //   Set mode for Switch
106    }
107  }
108  // volumeUp Button
109  if ((newState_volumeUp   == LOW) && (oldState_volumeUp == HIGH)) {
110    // Short delay to debounce button.
111     delay(20);
112    // Check if button is still low after debounce.
113    newState_volumeUp   = digitalRead(BUTTON_PIN_volumeUp);
114    if (newState_volumeUp == LOW) {     //   Yes, still low
115      mode = 4; // Set mode for Switch
116    }
117  }
118
119   switch (mode) {          // Start an action...
120    case 1:
121      if (playstate   == 1) {
122        myDFPlayer.start();
123        mode = 0;
124        playstate   = 2;
125        Serial.println("Resume");
126        Lautstaerke();
127        Weiter();
128         Track();
129        delay(200);
130        break;
131      }
132      else   if (playstate == 2) {
133        myDFPlayer.pause();
134        mode = 0;
135        playstate   = 1;
136        Serial.println("Pause");
137        Lautstaerke();
138        Pause();
139         Track();
140        delay(200);
141        break;
142      }
143      else   if (playstate == 0) {
144        myDFPlayer.play(1);
145        mode = 0;
146        playstate   = 2;
147        Serial.println("Play");
148        Lautstaerke();
149        Play();
150         Track();
151        delay(200);
152        break;
153      }
154    case   2:
155      myDFPlayer.next();
156      delay(100);
157      mode     = 0;
158      Serial.println("Next   Track");
159      tracks = myDFPlayer.readFileCounts();
160      currtrack = myDFPlayer.readCurrentFileNumber();
161       Serial.print(currtrack);
162      Serial.print("/");
163      Serial.print(tracks);
164       Lautstaerke();
165      Play();
166      Track();
167      break;
168    case   3:
169
170      myDFPlayer.volumeDown();
171      mode = 0;
172      Serial.println("Leiser");
173       delay(100);
174      test = myDFPlayer.readVolume();
175      Serial.println(test);
176       Lautstaerke();
177      Track();
178      if (playstate != 0) {
179        if   (playstate != 1) {
180          Weiter();
181        }
182      } 
183      break;
184     case 4:
185      myDFPlayer.volumeUp();
186      mode = 0;
187      Serial.println("Lauter");
188       delay(100);
189      test = myDFPlayer.readVolume();
190      Serial.println(test);
191       Lautstaerke();
192      Track();
193      if (playstate != 0) {
194        if   (playstate != 1) {
195          Weiter();
196        }
197      }
198      break;
199   }
200}
201void Lautstaerke()
202{
203  int volume = myDFPlayer.readVolume();
204   u8x8.setFont(u8x8_font_5x8_f);
205  u8x8.setCursor(2, 0);
206  volumeunder = volume   - 1,
207  u8x8.print(volumeunder);
208  u8x8.setCursor(0, 1);
209  u8x8.setFont(u8x8_font_8x13_1x2_f);
210   u8x8.print(volume);
211  u8x8.setFont(u8x8_font_5x8_f);
212  u8x8.setCursor(2,   3);
213  volumeover = volume + 1,
214  u8x8.print(volumeover);
215  for (int i =   0; i <= 5; i++) {
216    u8x8.setCursor(4, i);
217    u8x8.print("|");
218  }
219}
220void   Weiter()
221{
222  u8x8.setFont(u8x8_font_7x14_1x2_f);
223  u8x8.setCursor(6, 0);
224   u8x8.print("");
225  u8x8.print("Playing");
226}
227void Play()
228{
229  u8x8.setFont(u8x8_font_7x14_1x2_f);
230   u8x8.setCursor(6, 0);
231  u8x8.print("");
232  u8x8.print("Playing");
233}
234void   Pause()
235{
236  u8x8.setFont(u8x8_font_7x14_1x2_f);
237  u8x8.setCursor(6, 0);
238   u8x8.print("");
239  u8x8.print("Pause  ");
240}
241void Track()
242{
243   u8x8.setFont(u8x8_font_7x14_1x2_f);
244  u8x8.setCursor(6, 2);
245  u8x8.print(myDFPlayer.readCurrentFileNumber());
246   u8x8.print(" / ");
247  u8x8.print(myDFPlayer.readFileCounts());
248}

#include "DFRobotDFPlayerMini.h"
#include <SPI.h>
#include <Wire.h>
#include   <U8g2lib.h>

#if !defined(UBRR1H)
#include <SoftwareSerial.h>
SoftwareSerial   mySerial(D7, D8); // RX, TX
#endif

#define BUTTON_PIN_pause  D3     //   Play_Pause Button
#define BUTTON_PIN_playnext  D5     // Next Button
#define   BUTTON_PIN_volumeUp  D4     // VolUp Button
#define BUTTON_PIN_volumeDown  D6      // VolDown Button

#define SCREEN_WIDTH 128 // OLED display width, in   pixels
#define SCREEN_HEIGHT 32 // OLED display height, in pixels
#define   OLED_RESET     -1 // Reset pin # (or -1 if sharing Arduino reset pin)
#define   SCREEN_ADDRESS 0x3C ///< See datasheet for Address; 0x3D for 128x64, 0x3C for 128x32
U8X8_SSD1306_128X32_UNIVISION_SW_I2C   u8x8(/* clock=D1*/ 5, /* data=D2*/ 4);

boolean oldState_pause = HIGH;
boolean   oldState_playnext = HIGH;
boolean oldState_volumeUp = HIGH;
boolean oldState_volumeDown   = HIGH;

int mode     = 0;    // Currently-active action mode
int playstate   = 0;
int test = 0;
int tracks = 0;
int currtrack = 0;
int currvol =   0;
int volume = 0;
int volumeunder = 0;
int volumeover = 0;
DFRobotDFPlayerMini   myDFPlayer;

void setup()
{
  pinMode(BUTTON_PIN_pause, INPUT_PULLUP);
   pinMode(BUTTON_PIN_playnext, INPUT_PULLUP);
  pinMode(BUTTON_PIN_volumeUp,   INPUT_PULLUP);
  pinMode(BUTTON_PIN_volumeDown, INPUT_PULLUP);
  Serial.begin(115200);

#if   !defined(UBRR1H)
  mySerial.begin(9600);
  myDFPlayer.begin(mySerial, true);
#else
   Serial1.begin(9600);
  myDFPlayer.begin(Serial1, true);
#endif
  delay(1000);

   myDFPlayer.outputDevice(DFPLAYER_DEVICE_SD);

  u8x8.begin();
  Serial.println(u8x8.getRows());
   u8x8.setBusClock(400000);

  Serial.println("Setting volume to 15");
   myDFPlayer.volume(15);
  delay(100);
  currvol = myDFPlayer.readVolume();
   Serial.println(currvol);
  Lautstaerke();
  Track();
  delay(100);
}

void   loop()
{
  boolean newState_pause = digitalRead(BUTTON_PIN_pause);
  boolean   newState_playnext = digitalRead(BUTTON_PIN_playnext);
  boolean newState_volumeUp   = digitalRead(BUTTON_PIN_volumeUp);
  boolean newState_volumeDown = digitalRead(BUTTON_PIN_volumeDown);

   // Play_Pause Button
  if ((newState_pause == LOW) && (oldState_pause == HIGH))   {
    // Short delay to debounce button.
    delay(20);
    // Check if   button is still low after debounce.
    newState_pause = digitalRead(BUTTON_PIN_pause);
     if (newState_pause == LOW) {     // Yes, still low
      mode = 1; // Set   mode for Switch
    }
  }
  // Play Next Button
  if ((newState_playnext   == LOW) && (oldState_playnext == HIGH)) {
    // Short delay to debounce button.
     delay(20);
    // Check if button is still low after debounce.
    newState_playnext   = digitalRead(BUTTON_PIN_playnext);
    if (newState_playnext == LOW) {     //   Yes, still low
      mode = 2; // Set mode for Switch
    }
  }
  //   volumeDown Button
  if ((newState_volumeDown == LOW) && (oldState_volumeDown   == HIGH)) {
    // Short delay to debounce button.
    delay(20);
    //   Check if button is still low after debounce.
    newState_volumeDown = digitalRead(BUTTON_PIN_volumeDown);
     if (newState_volumeDown == LOW) {     // Yes, still low
      mode = 3; //   Set mode for Switch
    }
  }
  // volumeUp Button
  if ((newState_volumeUp   == LOW) && (oldState_volumeUp == HIGH)) {
    // Short delay to debounce button.
     delay(20);
    // Check if button is still low after debounce.
    newState_volumeUp   = digitalRead(BUTTON_PIN_volumeUp);
    if (newState_volumeUp == LOW) {     //   Yes, still low
      mode = 4; // Set mode for Switch
    }
  }

   switch (mode) {          // Start an action...
    case 1:
      if (playstate   == 1) {
        myDFPlayer.start();
        mode = 0;
        playstate   = 2;
        Serial.println("Resume");
        Lautstaerke();
        Weiter();
         Track();
        delay(200);
        break;
      }
      else   if (playstate == 2) {
        myDFPlayer.pause();
        mode = 0;
        playstate   = 1;
        Serial.println("Pause");
        Lautstaerke();
        Pause();
         Track();
        delay(200);
        break;
      }
      else   if (playstate == 0) {
        myDFPlayer.play(1);
        mode = 0;
        playstate   = 2;
        Serial.println("Play");
        Lautstaerke();
        Play();
         Track();
        delay(200);
        break;
      }
    case   2:
      myDFPlayer.next();
      delay(100);
      mode     = 0;
      Serial.println("Next   Track");
      tracks = myDFPlayer.readFileCounts();
      currtrack = myDFPlayer.readCurrentFileNumber();
       Serial.print(currtrack);
      Serial.print("/");
      Serial.print(tracks);
       Lautstaerke();
      Play();
      Track();
      break;
    case   3:

      myDFPlayer.volumeDown();
      mode = 0;
      Serial.println("Leiser");
       delay(100);
      test = myDFPlayer.readVolume();
      Serial.println(test);
       Lautstaerke();
      Track();
      if (playstate != 0) {
        if   (playstate != 1) {
          Weiter();
        }
      } 
      break;
     case 4:
      myDFPlayer.volumeUp();
      mode = 0;
      Serial.println("Lauter");
       delay(100);
      test = myDFPlayer.readVolume();
      Serial.println(test);
       Lautstaerke();
      Track();
      if (playstate != 0) {
        if   (playstate != 1) {
          Weiter();
        }
      }
      break;
   }
}
void Lautstaerke()
{
  int volume = myDFPlayer.readVolume();
   u8x8.setFont(u8x8_font_5x8_f);
  u8x8.setCursor(2, 0);
  volumeunder = volume   - 1,
  u8x8.print(volumeunder);
  u8x8.setCursor(0, 1);
  u8x8.setFont(u8x8_font_8x13_1x2_f);
   u8x8.print(volume);
  u8x8.setFont(u8x8_font_5x8_f);
  u8x8.setCursor(2,   3);
  volumeover = volume + 1,
  u8x8.print(volumeover);
  for (int i =   0; i <= 5; i++) {
    u8x8.setCursor(4, i);
    u8x8.print("|");
  }
}
void   Weiter()
{
  u8x8.setFont(u8x8_font_7x14_1x2_f);
  u8x8.setCursor(6, 0);
   u8x8.print("");
  u8x8.print("Playing");
}
void Play()
{
  u8x8.setFont(u8x8_font_7x14_1x2_f);
   u8x8.setCursor(6, 0);
  u8x8.print("");
  u8x8.print("Playing");
}
void   Pause()
{
  u8x8.setFont(u8x8_font_7x14_1x2_f);
  u8x8.setCursor(6, 0);
   u8x8.print("");
  u8x8.print("Pause  ");
}
void Track()
{
   u8x8.setFont(u8x8_font_7x14_1x2_f);
  u8x8.setCursor(6, 2);
  u8x8.print(myDFPlayer.readCurrentFileNumber());
   u8x8.print(" / ");
  u8x8.print(myDFPlayer.readFileCounts());
}

NodeMCU MP3 Player with Display and buttons

c_cpp

Just Paste into your IDE and flash your NodeMCU

1#include "DFRobotDFPlayerMini.h"
2#include <SPI.h>
3#include <Wire.h>
4#include  <U8g2lib.h>
5
6#if !defined(UBRR1H)
7#include <SoftwareSerial.h>
8SoftwareSerial  mySerial(D7, D8); // RX, TX
9#endif
10
11#define BUTTON_PIN_pause  D3     //  Play_Pause Button
12#define BUTTON_PIN_playnext  D5     // Next Button
13#define  BUTTON_PIN_volumeUp  D4     // VolUp Button
14#define BUTTON_PIN_volumeDown  D6     // VolDown Button
15
16#define SCREEN_WIDTH 128 // OLED display width, in  pixels
17#define SCREEN_HEIGHT 32 // OLED display height, in pixels
18#define  OLED_RESET     -1 // Reset pin # (or -1 if sharing Arduino reset pin)
19#define  SCREEN_ADDRESS 0x3C ///< See datasheet for Address; 0x3D for 128x64, 0x3C for 128x32
20U8X8_SSD1306_128X32_UNIVISION_SW_I2C  u8x8(/* clock=D1*/ 5, /* data=D2*/ 4);
21
22boolean oldState_pause = HIGH;
23boolean  oldState_playnext = HIGH;
24boolean oldState_volumeUp = HIGH;
25boolean oldState_volumeDown  = HIGH;
26
27int mode     = 0;    // Currently-active action mode
28int playstate  = 0;
29int test = 0;
30int tracks = 0;
31int currtrack = 0;
32int currvol =  0;
33int volume = 0;
34int volumeunder = 0;
35int volumeover = 0;
36DFRobotDFPlayerMini  myDFPlayer;
37
38void setup()
39{
40  pinMode(BUTTON_PIN_pause, INPUT_PULLUP);
41  pinMode(BUTTON_PIN_playnext, INPUT_PULLUP);
42  pinMode(BUTTON_PIN_volumeUp,  INPUT_PULLUP);
43  pinMode(BUTTON_PIN_volumeDown, INPUT_PULLUP);
44  Serial.begin(115200);
45
46#if  !defined(UBRR1H)
47  mySerial.begin(9600);
48  myDFPlayer.begin(mySerial, true);
49#else
50  Serial1.begin(9600);
51  myDFPlayer.begin(Serial1, true);
52#endif
53  delay(1000);
54
55  myDFPlayer.outputDevice(DFPLAYER_DEVICE_SD);
56
57  u8x8.begin();
58  Serial.println(u8x8.getRows());
59  u8x8.setBusClock(400000);
60
61  Serial.println("Setting volume to 15");
62  myDFPlayer.volume(15);
63  delay(100);
64  currvol = myDFPlayer.readVolume();
65  Serial.println(currvol);
66  Lautstaerke();
67  Track();
68  delay(100);
69}
70
71void  loop()
72{
73  boolean newState_pause = digitalRead(BUTTON_PIN_pause);
74  boolean  newState_playnext = digitalRead(BUTTON_PIN_playnext);
75  boolean newState_volumeUp  = digitalRead(BUTTON_PIN_volumeUp);
76  boolean newState_volumeDown = digitalRead(BUTTON_PIN_volumeDown);
77
78  // Play_Pause Button
79  if ((newState_pause == LOW) && (oldState_pause == HIGH))  {
80    // Short delay to debounce button.
81    delay(20);
82    // Check if  button is still low after debounce.
83    newState_pause = digitalRead(BUTTON_PIN_pause);
84    if (newState_pause == LOW) {     // Yes, still low
85      mode = 1; // Set  mode for Switch
86    }
87  }
88  // Play Next Button
89  if ((newState_playnext  == LOW) && (oldState_playnext == HIGH)) {
90    // Short delay to debounce button.
91    delay(20);
92    // Check if button is still low after debounce.
93    newState_playnext  = digitalRead(BUTTON_PIN_playnext);
94    if (newState_playnext == LOW) {     //  Yes, still low
95      mode = 2; // Set mode for Switch
96    }
97  }
98  //  volumeDown Button
99  if ((newState_volumeDown == LOW) && (oldState_volumeDown  == HIGH)) {
100    // Short delay to debounce button.
101    delay(20);
102    //  Check if button is still low after debounce.
103    newState_volumeDown = digitalRead(BUTTON_PIN_volumeDown);
104    if (newState_volumeDown == LOW) {     // Yes, still low
105      mode = 3; //  Set mode for Switch
106    }
107  }
108  // volumeUp Button
109  if ((newState_volumeUp  == LOW) && (oldState_volumeUp == HIGH)) {
110    // Short delay to debounce button.
111    delay(20);
112    // Check if button is still low after debounce.
113    newState_volumeUp  = digitalRead(BUTTON_PIN_volumeUp);
114    if (newState_volumeUp == LOW) {     //  Yes, still low
115      mode = 4; // Set mode for Switch
116    }
117  }
118
119  switch (mode) {          // Start an action...
120    case 1:
121      if (playstate  == 1) {
122        myDFPlayer.start();
123        mode = 0;
124        playstate  = 2;
125        Serial.println("Resume");
126        Lautstaerke();
127        Weiter();
128        Track();
129        delay(200);
130        break;
131      }
132      else  if (playstate == 2) {
133        myDFPlayer.pause();
134        mode = 0;
135        playstate  = 1;
136        Serial.println("Pause");
137        Lautstaerke();
138        Pause();
139        Track();
140        delay(200);
141        break;
142      }
143      else  if (playstate == 0) {
144        myDFPlayer.play(1);
145        mode = 0;
146        playstate  = 2;
147        Serial.println("Play");
148        Lautstaerke();
149        Play();
150        Track();
151        delay(200);
152        break;
153      }
154    case  2:
155      myDFPlayer.next();
156      delay(100);
157      mode     = 0;
158      Serial.println("Next  Track");
159      tracks = myDFPlayer.readFileCounts();
160      currtrack = myDFPlayer.readCurrentFileNumber();
161      Serial.print(currtrack);
162      Serial.print("/");
163      Serial.print(tracks);
164      Lautstaerke();
165      Play();
166      Track();
167      break;
168    case  3:
169
170      myDFPlayer.volumeDown();
171      mode = 0;
172      Serial.println("Leiser");
173      delay(100);
174      test = myDFPlayer.readVolume();
175      Serial.println(test);
176      Lautstaerke();
177      Track();
178      if (playstate != 0) {
179        if  (playstate != 1) {
180          Weiter();
181        }
182      } 
183      break;
184    case 4:
185      myDFPlayer.volumeUp();
186      mode = 0;
187      Serial.println("Lauter");
188      delay(100);
189      test = myDFPlayer.readVolume();
190      Serial.println(test);
191      Lautstaerke();
192      Track();
193      if (playstate != 0) {
194        if  (playstate != 1) {
195          Weiter();
196        }
197      }
198      break;
199  }
200}
201void Lautstaerke()
202{
203  int volume = myDFPlayer.readVolume();
204  u8x8.setFont(u8x8_font_5x8_f);
205  u8x8.setCursor(2, 0);
206  volumeunder = volume  - 1,
207  u8x8.print(volumeunder);
208  u8x8.setCursor(0, 1);
209  u8x8.setFont(u8x8_font_8x13_1x2_f);
210  u8x8.print(volume);
211  u8x8.setFont(u8x8_font_5x8_f);
212  u8x8.setCursor(2,  3);
213  volumeover = volume + 1,
214  u8x8.print(volumeover);
215  for (int i =  0; i <= 5; i++) {
216    u8x8.setCursor(4, i);
217    u8x8.print("|");
218  }
219}
220void  Weiter()
221{
222  u8x8.setFont(u8x8_font_7x14_1x2_f);
223  u8x8.setCursor(6, 0);
224  u8x8.print("");
225  u8x8.print("Playing");
226}
227void Play()
228{
229  u8x8.setFont(u8x8_font_7x14_1x2_f);
230  u8x8.setCursor(6, 0);
231  u8x8.print("");
232  u8x8.print("Playing");
233}
234void  Pause()
235{
236  u8x8.setFont(u8x8_font_7x14_1x2_f);
237  u8x8.setCursor(6, 0);
238  u8x8.print("");
239  u8x8.print("Pause  ");
240}
241void Track()
242{
243  u8x8.setFont(u8x8_font_7x14_1x2_f);
244  u8x8.setCursor(6, 2);
245  u8x8.print(myDFPlayer.readCurrentFileNumber());
246  u8x8.print(" / ");
247  u8x8.print(myDFPlayer.readFileCounts());
248}

#include "DFRobotDFPlayerMini.h"
#include <SPI.h>
#include <Wire.h>
#include  <U8g2lib.h>

#if !defined(UBRR1H)
#include <SoftwareSerial.h>
SoftwareSerial  mySerial(D7, D8); // RX, TX
#endif

#define BUTTON_PIN_pause  D3     //  Play_Pause Button
#define BUTTON_PIN_playnext  D5     // Next Button
#define  BUTTON_PIN_volumeUp  D4     // VolUp Button
#define BUTTON_PIN_volumeDown  D6     // VolDown Button

#define SCREEN_WIDTH 128 // OLED display width, in  pixels
#define SCREEN_HEIGHT 32 // OLED display height, in pixels
#define  OLED_RESET     -1 // Reset pin # (or -1 if sharing Arduino reset pin)
#define  SCREEN_ADDRESS 0x3C ///< See datasheet for Address; 0x3D for 128x64, 0x3C for 128x32
U8X8_SSD1306_128X32_UNIVISION_SW_I2C  u8x8(/* clock=D1*/ 5, /* data=D2*/ 4);

boolean oldState_pause = HIGH;
boolean  oldState_playnext = HIGH;
boolean oldState_volumeUp = HIGH;
boolean oldState_volumeDown  = HIGH;

int mode     = 0;    // Currently-active action mode
int playstate  = 0;
int test = 0;
int tracks = 0;
int currtrack = 0;
int currvol =  0;
int volume = 0;
int volumeunder = 0;
int volumeover = 0;
DFRobotDFPlayerMini  myDFPlayer;

void setup()
{
  pinMode(BUTTON_PIN_pause, INPUT_PULLUP);
  pinMode(BUTTON_PIN_playnext, INPUT_PULLUP);
  pinMode(BUTTON_PIN_volumeUp,  INPUT_PULLUP);
  pinMode(BUTTON_PIN_volumeDown, INPUT_PULLUP);
  Serial.begin(115200);

#if  !defined(UBRR1H)
  mySerial.begin(9600);
  myDFPlayer.begin(mySerial, true);
#else
  Serial1.begin(9600);
  myDFPlayer.begin(Serial1, true);
#endif
  delay(1000);

  myDFPlayer.outputDevice(DFPLAYER_DEVICE_SD);

  u8x8.begin();
  Serial.println(u8x8.getRows());
  u8x8.setBusClock(400000);

  Serial.println("Setting volume to 15");
  myDFPlayer.volume(15);
  delay(100);
  currvol = myDFPlayer.readVolume();
  Serial.println(currvol);
  Lautstaerke();
  Track();
  delay(100);
}

void  loop()
{
  boolean newState_pause = digitalRead(BUTTON_PIN_pause);
  boolean  newState_playnext = digitalRead(BUTTON_PIN_playnext);
  boolean newState_volumeUp  = digitalRead(BUTTON_PIN_volumeUp);
  boolean newState_volumeDown = digitalRead(BUTTON_PIN_volumeDown);

  // Play_Pause Button
  if ((newState_pause == LOW) && (oldState_pause == HIGH))  {
    // Short delay to debounce button.
    delay(20);
    // Check if  button is still low after debounce.
    newState_pause = digitalRead(BUTTON_PIN_pause);
    if (newState_pause == LOW) {     // Yes, still low
      mode = 1; // Set  mode for Switch
    }
  }
  // Play Next Button
  if ((newState_playnext  == LOW) && (oldState_playnext == HIGH)) {
    // Short delay to debounce button.
    delay(20);
    // Check if button is still low after debounce.
    newState_playnext  = digitalRead(BUTTON_PIN_playnext);
    if (newState_playnext == LOW) {     //  Yes, still low
      mode = 2; // Set mode for Switch
    }
  }
  //  volumeDown Button
  if ((newState_volumeDown == LOW) && (oldState_volumeDown  == HIGH)) {
    // Short delay to debounce button.
    delay(20);
    //  Check if button is still low after debounce.
    newState_volumeDown = digitalRead(BUTTON_PIN_volumeDown);
    if (newState_volumeDown == LOW) {     // Yes, still low
      mode = 3; //  Set mode for Switch
    }
  }
  // volumeUp Button
  if ((newState_volumeUp  == LOW) && (oldState_volumeUp == HIGH)) {
    // Short delay to debounce button.
    delay(20);
    // Check if button is still low after debounce.
    newState_volumeUp  = digitalRead(BUTTON_PIN_volumeUp);
    if (newState_volumeUp == LOW) {     //  Yes, still low
      mode = 4; // Set mode for Switch
    }
  }

  switch (mode) {          // Start an action...
    case 1:
      if (playstate  == 1) {
        myDFPlayer.start();
        mode = 0;
        playstate  = 2;
        Serial.println("Resume");
        Lautstaerke();
        Weiter();
        Track();
        delay(200);
        break;
      }
      else  if (playstate == 2) {
        myDFPlayer.pause();
        mode = 0;
        playstate  = 1;
        Serial.println("Pause");
        Lautstaerke();
        Pause();
        Track();
        delay(200);
        break;
      }
      else  if (playstate == 0) {
        myDFPlayer.play(1);
        mode = 0;
        playstate  = 2;
        Serial.println("Play");
        Lautstaerke();
        Play();
        Track();
        delay(200);
        break;
      }
    case  2:
      myDFPlayer.next();
      delay(100);
      mode     = 0;
      Serial.println("Next  Track");
      tracks = myDFPlayer.readFileCounts();
      currtrack = myDFPlayer.readCurrentFileNumber();
      Serial.print(currtrack);
      Serial.print("/");
      Serial.print(tracks);
      Lautstaerke();
      Play();
      Track();
      break;
    case  3:

      myDFPlayer.volumeDown();
      mode = 0;
      Serial.println("Leiser");
      delay(100);
      test = myDFPlayer.readVolume();
      Serial.println(test);
      Lautstaerke();
      Track();
      if (playstate != 0) {
        if  (playstate != 1) {
          Weiter();
        }
      } 
      break;
    case 4:
      myDFPlayer.volumeUp();
      mode = 0;
      Serial.println("Lauter");
      delay(100);
      test = myDFPlayer.readVolume();
      Serial.println(test);
      Lautstaerke();
      Track();
      if (playstate != 0) {
        if  (playstate != 1) {
          Weiter();
        }
      }
      break;
  }
}
void Lautstaerke()
{
  int volume = myDFPlayer.readVolume();
  u8x8.setFont(u8x8_font_5x8_f);
  u8x8.setCursor(2, 0);
  volumeunder = volume  - 1,
  u8x8.print(volumeunder);
  u8x8.setCursor(0, 1);
  u8x8.setFont(u8x8_font_8x13_1x2_f);
  u8x8.print(volume);
  u8x8.setFont(u8x8_font_5x8_f);
  u8x8.setCursor(2,  3);
  volumeover = volume + 1,
  u8x8.print(volumeover);
  for (int i =  0; i <= 5; i++) {
    u8x8.setCursor(4, i);
    u8x8.print("|");
  }
}
void  Weiter()
{
  u8x8.setFont(u8x8_font_7x14_1x2_f);
  u8x8.setCursor(6, 0);
  u8x8.print("");
  u8x8.print("Playing");
}
void Play()
{
  u8x8.setFont(u8x8_font_7x14_1x2_f);
  u8x8.setCursor(6, 0);
  u8x8.print("");
  u8x8.print("Playing");
}
void  Pause()
{
  u8x8.setFont(u8x8_font_7x14_1x2_f);
  u8x8.setCursor(6, 0);
  u8x8.print("");
  u8x8.print("Pause  ");
}
void Track()
{
  u8x8.setFont(u8x8_font_7x14_1x2_f);
  u8x8.setCursor(6, 2);
  u8x8.print(myDFPlayer.readCurrentFileNumber());
  u8x8.print(" / ");
  u8x8.print(myDFPlayer.readFileCounts());
}

Downloadable files

Fritzing of the complete setup

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