Make sketch shorter, simply

Oke

Wel first this is the working code i already have, in this example there are 3 mp3 bank, but normaly its up to 10 or 11 banks, i think its to much to paste here, anyway the old code:

#include "LiquidCrystal_I2C.h"
#include "SoftwareSerial.h"
#include "DFRobotDFPlayerMini.h"

SoftwareSerial mySoftwareSerial(2, 3); // RX, TX
DFRobotDFPlayerMini myDFPlayer;
LiquidCrystal_I2C lcd(0x3F, 2, 1, 0, 4, 5, 6, 7, 3, POSITIVE);

  
#define butUp     12     
#define butDown   11     
#define butP      10       
#define butM      9     
#define btns A0        



void changeMenu();
void dispMenu();
void mp3Bank1();
void mp3Bank2();
void mp3Bank3();
char menu = 0x01;
char set1 = 0x00, set2 = 0x00 , set3 = 0x00;
boolean t_butUp, t_butDown, t_butP, t_butM;


void setup() {
 
 mySoftwareSerial.begin(9600);
  if (!myDFPlayer.begin(mySoftwareSerial)) {  //Use softwareSerial to communicate with mp3.
  while(true);
  }


  myDFPlayer.setTimeOut(500); //Set serial communictaion time out 500ms
  
  //----Set volume----
  myDFPlayer.volume(30);  //Set volume value (0~30).
   
  //----Set different EQ----
  myDFPlayer.EQ(DFPLAYER_EQ_ROCK);
  
  //----Set device we use SD as default----
  myDFPlayer.outputDevice(DFPLAYER_DEVICE_FLASH);
  
  for (char i=9; i<13; i++){        
  }
  t_butUp   = 0x00;             
  t_butDown = 0x00;
  t_butP  = 0x00;
  t_butM  = 0x00;
 
}

void loop() {
  
  changeMenu();               
  dispMenu();                 
}
//Functies

void changeMenu(){
  
  if(digitalRead(butUp) == 0x00){       // UP
    
    t_butUp = 0x01;
    
  }
  
   if(digitalRead(butDown) == 0x00){      //DOWN
    
    t_butDown = 0x01;
    
  }
  
  if(digitalRead(butUp) && t_butUp){
    
    t_butUp = 0x00;
    
    lcd.clear();     
    
    menu++;
     
    if(menu > 0x04){
      
      menu = 0x01;
    }
  }
  
  if(digitalRead(butDown) && t_butDown){
    
    t_butDown = 0x00;
    
    lcd.clear();
    
    menu--;
     
    if(menu < 0x01){
      
      menu = 0x04;
    }
  }    
  
}



void dispMenu(){
  
  switch(menu){
    
    case 0x01:
        mp3Bank1();              //Funzione controllo  led1
      break;
    case 0x02:
        mp3Bank2();             //Funzione controllo  led2
       break;
    case 0x03:
        mp3Bank3();             //Funzione controllo  led2
      break;

  }
}





/*begin mp3 bank1*/
void mp3Bank1(){

  lcd.setCursor(0,1);
  lcd.print("mp3 bank 1");

  val = analogRead(btns);

  if (val >= 400 && val <= 445)
  {
   myDFPlayer.playFolder(01, 1);
   lcd.setCursor(0, 4);
   lcd.print("Playing: Sound 1");
  }
  else if (val >= 445 && val <= 480)
  {
   myDFPlayer.playFolder(01, 2);
   lcd.setCursor(0, 4);
   lcd.print("Playing: Sound 2");
  }
  else if (val >= 480 && val <= 520)
  {
   myDFPlayer.playFolder(01, 3);
   lcd.setCursor(0, 4);
   lcd.print("Playing: Sound 3");
  }
  else if (val >= 520 && val <= 570)
  {
   myDFPlayer.playFolder(01, 4);
   lcd.setCursor(0, 4);
   lcd.print("Playing: Sound 4");
  }
  else if (val >= 570 && val <= 630)
  {
   myDFPlayer.playFolder(01, 5);
   lcd.setCursor(0, 4);
   lcd.print("Playing: Sound 5");
  }
  else if (val >= 630 && val <= 700)
  {
   myDFPlayer.playFolder(01, 6);
   lcd.setCursor(0, 4);
   lcd.print("Playing: Sound 6");
  }
  else if (val >= 700 && val <= 800)
  {
   myDFPlayer.playFolder(01, 7);
   lcd.setCursor(0, 4);
   lcd.print("Playing: Sound 7");
  }
  else if (val >= 800 && val <= 900)
  {
   myDFPlayer.playFolder(01, 8);
   lcd.setCursor(0, 4);
   lcd.print("Playing: Sound 8");
  

 if(digitalRead(butP) == 0x00){ 
    t_butP = 0x01;
  }
  if(digitalRead(butM) == 0x00){  
    t_butM = 0x01;
  }
  if(digitalRead(butP) && t_butP){ 
    t_butP = 0x00;
    set3++;
    if(set3 > 2){      
      set3 = 0x01;
    }
  }
  }
  }





/*begin mp3 bank2*/
void mp3Bank2(){
 

  lcd.setCursor(0,1);
  lcd.print("mp3 bank 2");

   val = analogRead(btns);

  if (val >= 400 && val <= 445)
  {
   myDFPlayer.playFolder(02, 1);
   lcd.setCursor(0, 4);
   lcd.print("Playing: Sound 1");
  }
  else if (val >= 445 && val <= 480)
  {
   myDFPlayer.playFolder(02, 2);
   lcd.setCursor(0, 4);
   lcd.print("Playing: Sound 2");
  }
  else if (val >= 480 && val <= 520)
  {
   myDFPlayer.playFolder(02, 3);
   lcd.setCursor(0, 4);
   lcd.print("Playing: Sound 3");
  }
  else if (val >= 520 && val <= 570)
  {
   myDFPlayer.playFolder(02, 4);
   lcd.setCursor(0, 4);
   lcd.print("Playing: Sound 4");
  }
  else if (val >= 570 && val <= 630)
  {
   myDFPlayer.playFolder(02, 5);
   lcd.setCursor(0, 4);
   lcd.print("Playing: Sound 5");
  }
  else if (val >= 630 && val <= 700)
  {
   myDFPlayer.playFolder(02, 6);
   lcd.setCursor(0, 4);
   lcd.print("Playing: Sound 6");
  }
  else if (val >= 700 && val <= 800)
  {
   myDFPlayer.playFolder(02, 7);
   lcd.setCursor(0, 4);
   lcd.print("Playing: Sound 7");
  }
  else if (val >= 800 && val <= 900)
  {
   myDFPlayer.playFolder(02, 8);
   lcd.setCursor(0, 4);
   lcd.print("Playing: Sound 8");

 if(digitalRead(butP) == 0x00){ 
    t_butP = 0x01;
  }
  if(digitalRead(butM) == 0x00){  
    t_butM = 0x01;
  }
  if(digitalRead(butP) && t_butP){ 
    t_butP = 0x00;
    set3++;
    if(set3 > 2){      
      set3 = 0x01;
    }
        

  }
}
}



/*Begin mp3 bank3*/
void mp3Bank3(){

    lcd.setCursor(0,1);
  lcd.print("mp3 bank 3");
  
  val = analogRead(btns);

  if (val >= 400 && val <= 445)
  {
   myDFPlayer.playFolder(03, 1);
   lcd.setCursor(0, 4);
   lcd.print("Playing: Sound 1");
  }
  else if (val >= 445 && val <= 480)
  {
   myDFPlayer.playFolder(03, 2);
   lcd.setCursor(0, 4);
   lcd.print("Playing: Sound 2");
  }
  else if (val >= 480 && val <= 520)
  {
   myDFPlayer.playFolder(03, 3);
   lcd.setCursor(0, 4);
   lcd.print("Playing: Sound 3");
  }
  else if (val >= 520 && val <= 570)
  {
   myDFPlayer.playFolder(03, 4);
   lcd.setCursor(0, 4);
   lcd.print("Playing: Sound 4");
  }
  else if (val >= 570 && val <= 630)
  {
   myDFPlayer.playFolder(03, 5);
   lcd.setCursor(0, 4);
   lcd.print("Playing: Sound 5");
  }
  else if (val >= 630 && val <= 700)
  {
   myDFPlayer.playFolder(03, 6);
   lcd.setCursor(0, 4);
   lcd.print("Playing: Sound 6");
  }
  else if (val >= 700 && val <= 800)
  {
   myDFPlayer.playFolder(03, 7);
   lcd.setCursor(0, 4);
   lcd.print("Playing: Sound 7");
  }
  else if (val >= 800 && val <= 900)
  {
   myDFPlayer.playFolder(03, 8);
   lcd.setCursor(0, 4);
   lcd.print("Playing: Sound 8");
  
  if(digitalRead(butP) == 0x00){
   
    t_butP = 0x01;
  }
  
  if(digitalRead(butM) == 0x00){
   
    t_butM = 0x01;
    
  }
  
  if(digitalRead(butP) && t_butP){
    
    t_butP = 0x00;
    set3++;
    
    if(set3 > 2){
      
      set3 = 0x01;
    }
    

  }

  }
}