描述

對于我的第一個 Arduino 項目，我決定制作一個 DM 控制臺作為生日禮物送給一位兒時的摯友。

對于那些希望看到最終產品的人，請點擊此鏈接。

它從功能和外觀的草圖開始：

中間有一個 LCD 屏幕，周圍有大約 13 個按鈕。1 個用于 D20 滾動的按鈕，1 個用于隨機金寶的按鈕，5 個用于從文件中生成隨機文本的按鈕（魔法物品、怪物、NPC、法術、DM 決定），6 個用于背景音樂的按鈕。

我從一個從未開始的項目中獲得了我需要的大部分硬件。所以首先我下載了?? Arduino Desktop IDE。我的電腦無法識別 Arduino——中國芯片所需的驅動程序。現在我可以開始了。

很快我就明白我需要一張用于文件的 SD 卡和一張用于音樂的 SD 卡。完畢。

第 1 步：連接 LCD 屏幕并進行打印。

使用此鏈接很容易。獲得更大的屏幕并使用此處步驟 1 中的代碼來計算 LCD 的正確地址。我寫了以下代碼：

//YWROBOT
//Compatible with the Arduino IDE 1.0
//Library version:1.1
#include  
#include 
LiquidCrystal_I2C lcd(0x3F,20,4);  // set the LCD address to 0x3F for a 20 chars and 4 line display
int i=0;
int n=0;
void setup()
{
 Serial.begin(9600);
 lcd.init();                      // initialize the lcd 
 // Print a message to the LCD.
 lcd.backlight();
 lcd.setCursor(1,0);
 lcd.print("Hello, world!");
 lcd.setCursor(0,1);
 lcd.print("Ywrobot Arduino!");
}
void loop()
{
 delay(1000);
 lcd.clear();
 n = i%7;
 if (n < 1)
 {
 lcd.setCursor(1,0);
 lcd.print("BOOOOM!!");
 Serial.println("BOOM!"); 
 }
 else 
 {
   Serial.println(i%7);
   lcd.setCursor(0,1);
   lcd.print(i);
 }
 i++;
} 

第二步：生成隨機數。

使用Random 函數，我編寫了一個測試代碼——在屏幕上生成 1 到 20 之間的隨機數，上面有文字：

#include  
#include 
LiquidCrystal_I2C lcd(0x3F,20,4);  // set the LCD address to 0x27 for a 16 chars and 2 line display
int i=0;
int n=0;
void setup()
{
 Serial.begin(9600);
 lcd.init();                      // initialize the lcd 
 // Print a message to the LCD.
 lcd.backlight();
 lcd.setCursor(1,0);
 lcd.print("Hello, world!");
 lcd.setCursor(0,1);
 lcd.print("Lets roll some D20s!");
}
void loop()
{
 delay(1000);
 lcd.clear();
 lcd.setCursor(1,0);
 lcd.print("5 X D20 roll");
 lcd.setCursor(0,1);
 lcd.print(random(1, 21));
 lcd.setCursor(3,1);
 lcd.print(random(1, 21));
 lcd.setCursor(6,1);
 lcd.print(random(1, 21));
 lcd.setCursor(9,1);
 lcd.print(random(1, 21));
 lcd.setCursor(12,1);
 lcd.print(random(1, 21));
} 

第 3 步：連接并編碼一個按鈕以使其工作。

我學會了如何使用這個鏈接做到這一點。

D20 的代碼就是這樣誕生的：

#include  
#include 
LiquidCrystal_I2C lcd(0x3F,20,4);  // set the LCD address to 0x3F for a 20
int i=0;
int n=0;
// constants won't change. They're used here to set pin numbers:
const int BUTTON_PIN_D20 = 7; // the number of the pushbutton pin
// this code shows on LCD 5 random D20 result when pushing a buuton!
// Variables will change:
int currentStateD20;    // the current reading from the input pin
void setup()
{
 // initialize serial communication at 9600 bits per second:
 Serial.begin(9600);
 lcd.init();                      // initialize the lcd 
 // Print a message to the LCD.
 lcd.backlight();
 lcd.setCursor(0,2);
 lcd.print("Hello, DM all mighty");
 // initialize the pushbutton pin as an pull-up input
 // the pull-up input pin will be HIGH when the switch is open and LOW when the switch is closed.
 pinMode(BUTTON_PIN_D20, INPUT_PULLUP);
}
void loop()
{
 // read the state of the switch/button:
 currentStateD20 = digitalRead(BUTTON_PIN_D20);
 if(currentStateD20 == LOW) 
 {
 lcd.clear();
 lcd.setCursor(1,0);
 lcd.print("5 X D20 roll");
 lcd.setCursor(0,2);
 lcd.print(random(1, 21));
 lcd.setCursor(3,2);
 lcd.print(random(1, 21));
 lcd.setCursor(6,2);
 lcd.print(random(1, 21));
 lcd.setCursor(9,2);
 lcd.print(random(1, 21));
 lcd.setCursor(12,2);
 lcd.print(random(1, 21));
  //delay(1000);
 }
}

第 4 步：從 SD 卡中讀取特定行。

首先，我學會了讀寫 SD 卡。但這就是讀取整個文件的方法，我只需要一個特定的行！幸運的是，我找到了這篇文章并使用了@septillion代碼：

voidprintLineN(unsigned int lineNumer){
 myFile.seek(0);
 char cr;
 for(unsigned int i = 0; i < (lineNumber -1);){
   cr = MyFile.read()
 if(cr == '\n'){
     i++;
   }
 }
 //Now we areat the right line
 while(true){
   cr = myFile.read();
   Serial.write(cr);
 if(cr == '\n'){
 break;
   }
 }
 //a for loopwith a read limit might be a good idea
}

我必須承認，我一開始并不理解代碼并且害怕使用它。尋找其他解決方案（甚至考慮構建一個服務器來與 Arduino 與 WIFI 通信），最終有勇氣使用這段代碼并將其用于我的項目 - 它就像魔術一樣工作。

另一位朋友 (Ofir Sofer) 幫助我處理了 TXT 文件的內容，而我正在攻克這一領域。我構建了以下函數，它工作正常，但有一個小錯誤——一個不需要的整理字符。

經過多次嘗試，我通過添加以下代碼行找到了此錯誤的解決方案：

//closing the string without \n\r which adds unwanted char in the end
rnd_string[j-2]= 0;

以及整個功能代碼：

// this function finds the needed line (lineNumber) in a txt file from 
//sd card (indecated by filenmber) and shows it on the lcd screen
void printLineN(unsigned int lineNumber, unsigned int filenumber ){
 char rnd_string[LCD_colums+1] = ""; 
 rnd_string[1] = 0; 
 char cr;
 //  SD card initialization
 while (!Serial) {
 ; // wait for serial port to connect. Needed for native USB port only
 }
 Serial.print(F("Initializing SD card..."));
 if (!SD.begin(10)) {
   Serial.println(F("initialization failed!"));
   while (1);
 }
 Serial.println(F("initialization done."));
 // finding the correct file to open
 switch (filenumber) {
   case 1: {myFile = SD.open("monsters.txt");
           break;}
   case 2: {myFile = SD.open("spells.txt");
           break;}
   case 3: {myFile = SD.open("DMD.txt");
           break;}
   case 4: {myFile = SD.open("item.txt");
           break;}
   case 5: {myFile = SD.open("NPCtrait.txt");
           break;}
 }
 myFile.seek(0);
 Serial.println(F("file opened sucssesfuly."));  
 // seeking the right line in the file
 for(unsigned int i = 0; i < (lineNumber -1);){
   cr = myFile.read();
   if(cr == '\n'){
     i++;
   }
 }
 int j=0; //string index
 cr = ' '; // initialization of cr to get inside while loop
 //Now we are at the right line
 while(cr != '\n'){ 
   cr = myFile.read();
   Serial.println(cr);
   rnd_string[j] = cr;
   j++;
   //if string is bigger than LCD max columns than print to LCD 
   //and move one row down
   if (j == LCD_colums) { 
     if (rnd_string[j] == '\n') 
        rnd_string[j-1] = 0;
     else if (rnd_string[j] == '\r') 
        rnd_string[j-1] = 0;
     lcd.setCursor(0,1);
     //print first row
     lcd.print(rnd_string);
     // zero the string and the counter
     rnd_string[0] = 0;
     j=0;
   }
 }
     //closing the string without \n\r which adds unwanted char in the end
     rnd_string[j-2] = 0;
     lcd.setCursor(0,2);
     //printing the string to LCD
     lcd.print(rnd_string);
     // close the file:
     myFile.close();
}

第 5 步：無法連接和使用 MP3 播放器模塊

我有這部分“HW-195-JL”：

這是一個有用的部分——有一個非常強大的放大器，作為一個獨立的工作——所以我需要弄清楚如何向它發送命令并繼續使用 Arduino 代碼。但它只有 3 個控件！返回 | 播放 | 固件。我希望它在觸發按鈕時播放特定文件。我決定嘗試使用固件跳過需要的文件并找到我希望播放的文件。編碼感覺很容易。與 Arduino 的連接是一個巨大的挑戰！

Step5.1：焊接和理解mp3播放器

在電源連接處使用電容器以減少靜態噪聲。

音頻輸出是單聲道的，我將它連接到 3.5 毫米母插孔并將 RNG 連接到 TIP 以獲得半立體聲輸出：

Step5.2：通過Arduino推薦控制mp3模塊。

這幾乎讓我崩潰了。觸發器僅適用于 3v 信號。無論我嘗試什么，我都找不到從 Arduino 發送這樣一個信號的方法。

然后它擊中了我！我需要使用晶體管來控制 mp3 模塊。

讓我自己 3 個 2n2222晶體管連接到 E 到 GND，B 到 Arduino 引腳，C 到另一個連接，并嘗試了一下。沒用?。經過一番谷歌搜索，我知道我需要一個 1KΩ 的電阻器（為了替換 2n2222，我可能會用 5V 燒毀）。最后，它奏效了！

[然后我決定把所有東西都焊接得更好，但它不再起作用了——我放棄了這部分，買了另一個模塊]

Step5.3：編寫代碼。

畢竟，到目前為止，我了解到，這部分的代碼感覺非常簡單。

因此，我編寫了代碼，并在循環代碼開始運行時聽到了可怕的跳過聲音。經過一小時的逐個檢查代碼和硬件連接后，我認為 Arduino 中的 PIN 3 是導致它的原因，并將一個按鈕移到另一個引腳。有效！直到它不起作用?

const int transistor_back = 6;      // back connected to digital pin 6
const int transistor_play = 4;      // back connected to digital pin 4
const int transistor_FW = 5;      // back connected to digital pin 5
const int BUTTON_PIN_city = 7;    // activation city button connected to digital pin 7
const int BUTTON_PIN_tavern = 12;    // activation tavern button connected to digital pin 12
const int BUTTON_PIN_nature = 11;    // activation nature button connected to digital pin 11
const int BUTTON_PIN_rain = 10;    // activation rain button connected to digital pin 10
const int BUTTON_PIN_battle = 9;    // activation battle button connected to digital pin 9
const int BUTTON_PIN_general = 8;    // activation general button connected to digital pin 8
int currentState1 = 0;
int currentState2 = 0;
int currentState3 = 0;
int currentState4 = 0;
int currentState5 = 0;
int currentState6 = 0;
int currentSong = 1;
void setup() {
   // initialize serial communication at 9600 bits per second:
 Serial.begin(9600);
 // initialize the pushbutton pin as an pull-up input
 // the pull-up input pin will be HIGH when the switch is open and LOW when the switch is closed.
 pinMode(BUTTON_PIN_city, INPUT_PULLUP);
 pinMode(BUTTON_PIN_tavern, INPUT_PULLUP);
 pinMode(BUTTON_PIN_nature, INPUT_PULLUP);
 pinMode(BUTTON_PIN_rain, INPUT_PULLUP);
 pinMode(BUTTON_PIN_battle, INPUT_PULLUP);
 pinMode(BUTTON_PIN_general, INPUT_PULLUP);
 pinMode(transistor_back, OUTPUT);  // sets the transistor pin as output
 pinMode(transistor_play, OUTPUT);  // sets the transistor pin as output
 pinMode(transistor_FW, OUTPUT);  // sets the transistor pin as output
 digitalWrite (transistor_back, LOW);
 digitalWrite (transistor_FW, LOW);
 Serial.println("playing the greetings sound");
 delay(19000);
 // at this moment I returned to the point that I'm unable to send the right massage to the MP3 player
 digitalWrite (transistor_play, HIGH);
 delay(100);
 digitalWrite (transistor_play, LOW);
 Serial.println("done play");
 }
void FW(int k) {
 Serial.println("start FW");
 if (k < 0) k = k+7;
 for (int i = 0 ; i < k ; i++){
   digitalWrite (transistor_FW, HIGH);
   delay(100);
   digitalWrite (transistor_FW, LOW);
   delay(100);
 }
}
void back(int k) {
 Serial.println("start back");
 if (k < 0) k = k+7;
 for (int i = 0 ; i < k ; i++){
   digitalWrite (transistor_back, HIGH);
   delay(100);
   digitalWrite (transistor_back, LOW);
   delay(100);
 }
}
void play() {
 digitalWrite (transistor_play, HIGH);
 delay(100);
 digitalWrite (transistor_play, LOW);
}
void loop() {
  Serial.println("start loop");
  //read city button
  currentState1 = digitalRead(BUTTON_PIN_city);
  if(currentState1 == LOW) 
  { 
   if (currentSong == 2) play();
   FW(2 - currentSong);
   currentSong = 2;
  }
  //read tavern button
  currentState2 = digitalRead(BUTTON_PIN_tavern);
  if(currentState2 == LOW) 
  { 
   if (currentSong == 3) play();
   FW(3 - currentSong);
   currentSong = 3;
  }
  //read Nature button
  currentState3 = digitalRead(BUTTON_PIN_nature);
  if(currentState3 == LOW) 
  { 
   if (currentSong == 4) play();
   FW(4 - currentSong);
   currentSong = 4;
  }
  //read Rain button
  currentState4 = digitalRead(BUTTON_PIN_rain);
  if(currentState4 == LOW) 
  { 
   if (currentSong == 5) play();
   FW(5 - currentSong);
   currentSong = 5;
  }
  //read Battle button
  currentState5 = digitalRead(BUTTON_PIN_battle);
  if(currentState5 == LOW) 
  { 
   if (currentSong == 6) play();
   FW(6 - currentSong);
   currentSong = 6;
  }
  //read General button
  currentState6 = digitalRead(BUTTON_PIN_general);
  if(currentState6 == LOW) 
  { 
   if (currentSong == 7) play();
   FW(7 - currentSong);
   currentSong = 7;
  }
}

再次第 5 步 – 從頭開始?? MP3 播放器

我又買了一個模塊——YX6300 UART TTL串口MP3音樂播放模塊

這個模塊要簡單得多，但缺少放大器。

發現這篇文章讓一切變得簡單。我很快就編寫了代碼，唯一的挑戰是弄清楚模塊如何對文件進行排序——按創建日期。

該模塊能夠通過 Arduino 和模塊之間的通信來播放特定文件以及更多功能（通信功能在我鏈接的帖子中的代碼中）。

壓軸 MP3 代碼：

// COPYIED FROM: https://create.arduino.cc/projecthub/moreirarobotics/how-to-use-the-yx5300-mp3-module-catalex-with-arduino-171a23
// Edited by Dror Moshe Aharoni
// pins connection: 7-12 - music buttons, 5 to mp3 TX, 6 to MP3 RX
#include 
#define ARDUINO_RX 5  //should connect to TX of the Serial MP3 Player module
#define ARDUINO_TX 6  //connect to RX of the module
SoftwareSerial mp3(ARDUINO_RX, ARDUINO_TX);
//#define mp3 Serial3    // Connect the MP3 Serial Player to the Arduino MEGA Serial3 (14 TX3 -> RX, 15 RX3 -> TX)
static int8_t Send_buf[8] = {0}; // Buffer for Send commands.  
static uint8_t ansbuf[10] = {0}; // Buffer for the answers.    
String mp3Answer;           // Answer from the MP3.
String sanswer(void);
String sbyte2hex(uint8_t b);
int BUTTON_PIN;
int last_pushed;
int buttonState;
int currentSong = 1;
int pause = 0;
/************ Command byte **************************/
#define CMD_NEXT_SONG     0X01  // Play next song.
#define CMD_PREV_SONG     0X02  // Play previous song.
#define CMD_PLAY_W_INDEX  0X03
#define CMD_VOLUME_UP     0X04
#define CMD_VOLUME_DOWN   0X05
#define CMD_SET_VOLUME    0X06
#define CMD_SNG_CYCL_PLAY 0X08  // Single Cycle Play.
#define CMD_SEL_DEV       0X09
#define CMD_SLEEP_MODE    0X0A
#define CMD_WAKE_UP       0X0B
#define CMD_RESET         0X0C
#define CMD_PLAY          0X0D
#define CMD_PAUSE         0X0E
#define CMD_PLAY_FOLDER_FILE 0X0F
#define CMD_STOP_PLAY     0X16
#define CMD_FOLDER_CYCLE  0X17
#define CMD_SHUFFLE_PLAY  0x18 //
#define CMD_SET_SNGL_CYCL 0X19 // Set single cycle.
#define CMD_SET_DAC 0X1A
#define DAC_ON  0X00
#define DAC_OFF 0X01
#define CMD_PLAY_W_VOL    0X22
#define CMD_PLAYING_N     0x4C
#define CMD_QUERY_STATUS      0x42
#define CMD_QUERY_VOLUME      0x43
#define CMD_QUERY_FLDR_TRACKS 0x4e
#define CMD_QUERY_TOT_TRACKS  0x48
#define CMD_QUERY_FLDR_COUNT  0x4f
/************ Opitons **************************/
#define DEV_TF            0X02
/*********************************************************************/
void setup()
{
 // starting the serial communication through the mp3 object
 // The mp3 module is controlled through commands received by the Arduino serial. In this process, we used the SoftwareSerial library and emulated a serial on the Arduino digital pins.
 // Thus, you will be able to use the Arduino to control the MP3 module through commands sent to it.
 Serial.begin(9600);
 mp3.begin(9600);
 delay(500);
 // initialization of the MP3 Card module
 sendCommand(CMD_SEL_DEV, 0, DEV_TF);
 delay(500);
 // initialize the pushbutton pins as an pull-up input
 // the pull-up input pin will be HIGH when the switch is open and LOW when the switch is closed.
 for (BUTTON_PIN = 7; BUTTON_PIN < 13; BUTTON_PIN++){
   //BUTTON_PIN is the number of the pushbutton pin
   pinMode(BUTTON_PIN, INPUT_PULLUP); 
 }
 sendCommand(0x06, 0 , 30);
 Serial.println("playing the greetings sound");
 sendCommand(0x03, 0 , 1);
 //delay(19000);
 delay(1000);
 last_pushed = 1;
}
//starting loop
void loop() {
 //Serial.println("start loop");
 buttonState = HIGH;
 BUTTON_PIN = 6;
 // read the state of the switch/button:
 while (buttonState == HIGH){
   BUTTON_PIN++;
   if (BUTTON_PIN == 13) BUTTON_PIN = 7;
   buttonState = digitalRead(BUTTON_PIN);
   // print out the button's state
   //Serial.println(BUTTON_PIN);
   //Serial.println(buttonState);
}
//
delay(500); 
//Serial.println("DM pushed button:");
 //Serial.println(BUTTON_PIN);
 if (BUTTON_PIN == last_pushed){
   switch (pause) {
     case 0:
       sendCommand(0x0E);
       last_pushed = BUTTON_PIN;
       pause = 1;
       sanswer();
       break;
     case 1:
       pause = 0;
       sendCommand(0x03, 0, BUTTON_PIN-5);
       if (mp3.available()) Serial.println(decodeMP3Answer());
       break;
   }
 }
 else 
 {
   // saving the last pushed button in order to enable music pause
   last_pushed = BUTTON_PIN;
   // playing the desired music file
   sendCommand(0x03, 0, BUTTON_PIN-5);
   //delay(3000);
   // Check for the answer.
 if (mp3.available()) Serial.println(decodeMP3Answer());
 }
}
/********************************************************************************/
/*Function sendMP3Command: seek for a 'c' command and send it to MP3  */
/*Parameter: c. Code for the MP3 Command, 'h' for help.                                                                                                         */
/*Return:  void                                                                */
void sendMP3Command(char c) {
 switch (c) {
   case '?':
   case 'h':
     Serial.println("HELP  ");
     Serial.println(" p = Play");
     Serial.println(" P = Pause");
     Serial.println(" > = Next");
     Serial.println(" < = Previous");
     Serial.println(" s = Stop Play"); 
     Serial.println(" + = Volume UP");
     Serial.println(" - = Volume DOWN");
     Serial.println(" c = Query current file");
     Serial.println(" q = Query status");
     Serial.println(" v = Query volume");
     Serial.println(" x = Query folder count");
     Serial.println(" t = Query total file count");
     Serial.println(" f = Play folder 1.");
     Serial.println(" S = Sleep");
     Serial.println(" W = Wake up");
     Serial.println(" r = Reset");
     break;
   case 'p':
     Serial.println("Play ");
     sendCommand(CMD_PLAY);
     break;
   case 'P':
     Serial.println("Pause");
     sendCommand(CMD_PAUSE);
     break;
   case '>':
     Serial.println("Next");
     sendCommand(CMD_NEXT_SONG);
     sendCommand(CMD_PLAYING_N); // ask for the number of file is playing
     break;
   case '<':
     Serial.println("Previous");
     sendCommand(CMD_PREV_SONG);
     sendCommand(CMD_PLAYING_N); // ask for the number of file is playing
     break;
   case 's':
     Serial.println("Stop Play");
     sendCommand(CMD_STOP_PLAY);
     break;
   case '+':
     Serial.println("Volume Up");
     sendCommand(CMD_VOLUME_UP);
     break;
   case '-':
     Serial.println("Volume Down");
     sendCommand(CMD_VOLUME_DOWN);
     break;
   case 'c':
     Serial.println("Query current file");
     sendCommand(CMD_PLAYING_N);
     break;
   case 'q':
     Serial.println("Query status");
     sendCommand(CMD_QUERY_STATUS);
     break;
   case 'v':
     Serial.println("Query volume");
     sendCommand(CMD_QUERY_VOLUME);
     break;
   case 'x':
     Serial.println("Query folder count");
     sendCommand(CMD_QUERY_FLDR_COUNT);
     break;
   case 't':
     Serial.println("Query total file count");
     sendCommand(CMD_QUERY_TOT_TRACKS);
     break;
   case 'f':
     Serial.println("Playing folder 1");
     sendCommand(CMD_FOLDER_CYCLE, 1, 0);
     break;
   case 'S':
     Serial.println("Sleep");
     sendCommand(CMD_SLEEP_MODE);
     break;
   case 'W':
     Serial.println("Wake up");
     sendCommand(CMD_WAKE_UP);
     break;
   case 'r':
     Serial.println("Reset");
     sendCommand(CMD_RESET);
     break;
 }
}
/********************************************************************************/
/*Function decodeMP3Answer: Decode MP3 answer.                                  */
/*Parameter:-void                                                               */
/*Return: The                                                  */
String decodeMP3Answer() {
 String decodedMP3Answer = "";
 decodedMP3Answer += sanswer();
 switch (ansbuf[3]) {
   case 0x3A:
     decodedMP3Answer += " -> Memory card inserted.";
     break;
   case 0x3D:
     decodedMP3Answer += " -> Completed play num " + String(ansbuf[6], DEC);
     //sendCommand(CMD_NEXT_SONG);
     //sendCommand(CMD_PLAYING_N); // ask for the number of file is playing
     break;
   case 0x40:
     decodedMP3Answer += " -> Error";
     break;
   case 0x41:
     decodedMP3Answer += " -> Data recived correctly. ";
     break;
   case 0x42:
     decodedMP3Answer += " -> Status playing: " + String(ansbuf[6], DEC);
     break;
   case 0x48:
     decodedMP3Answer += " -> File count: " + String(ansbuf[6], DEC);
     break;
   case 0x4C:
     decodedMP3Answer += " -> Playing: " + String(ansbuf[6], DEC);
     break;
   case 0x4E:
     decodedMP3Answer += " -> Folder file count: " + String(ansbuf[6], DEC);
     break;
   case 0x4F:
     decodedMP3Answer += " -> Folder count: " + String(ansbuf[6], DEC);
     break;
 }
 return decodedMP3Answer;
}
/********************************************************************************/
/*Function: Send command to the MP3                                             */
/*Parameter: byte command                                                       */
/*Parameter: byte dat1 parameter for the command                                */
/*Parameter: byte dat2 parameter for the command                                */
void sendCommand(byte command){
 sendCommand(command, 0, 0);
}
void sendCommand(byte command, byte dat1, byte dat2){
 delay(20);
 Send_buf[0] = 0x7E;    //
 Send_buf[1] = 0xFF;    //
 Send_buf[2] = 0x06;    // Len
 Send_buf[3] = command; //
 Send_buf[4] = 0x01;    // 0x00 NO, 0x01 feedback
 Send_buf[5] = dat1;    // datah
 Send_buf[6] = dat2;    // datal
 Send_buf[7] = 0xEF;    //
 Serial.print("Sending: ");
 for (uint8_t i = 0; i < 8; i++)
 {
   mp3.write(Send_buf[i]) ;
   Serial.print(sbyte2hex(Send_buf[i]));
 }
 Serial.println();
}
/********************************************************************************/
/*Function: sbyte2hex. Returns a byte data in HEX format.                       */
/*Parameter:- uint8_t b. Byte to convert to HEX.                                */
/*Return: String                                                                */
String sbyte2hex(uint8_t b)
{
 String shex;
 shex = "0X";
 if (b < 16) shex += "0";
 shex += String(b, HEX);
 shex += " ";
 return shex;
}
/********************************************************************************/
/*Function: shex2int. Returns a int from an HEX string.                         */
/*Parameter: s. char *s to convert to HEX.                                      */
/*Parameter: n. char *s' length.                                                */
/*Return: int                                                                   */
int shex2int(char *s, int n){
 int r = 0;
 for (int i=0; i    if(s[i]>='0' && s[i]<='9'){
     r *= 16; 
     r +=s[i]-'0';
    }else if(s[i]>='A' && s[i]<='F'){
     r *= 16;
     r += (s[i] - 'A') + 10;
    }
 }
 return r;
}
/********************************************************************************/
/*Function: sanswer. Returns a String answer from mp3 UART module.          */
/*Parameter:- uint8_t b. void.                                                  */
/*Return: String. If the answer is well formated answer.                        */
String sanswer(void)
{
 uint8_t i = 0;
 String mp3answer = "";
 // Get only 10 Bytes
 while (mp3.available() && (i < 10))
 {
   uint8_t b = mp3.read();
   ansbuf[i] = b;
   i++;
   mp3answer += sbyte2hex(b);
 }
 // if the answer format is correct.
 if ((ansbuf[0] == 0x7E) && (ansbuf[9] == 0xEF))
 {
   return mp3answer;
 }
 return "???: " + mp3answer;
} 

第 6 步：電源

我買了一個電源模塊，不知道真名是什么“MB-102 MB102”（？）

我將兩個 Arduino 都連接到該模塊，因此 DM 控制臺只需要一個電源輸入。

完美運行，并最大限度地減少了到控制臺的連接插座。

第7步：化妝品=^）

步驟 7.1：前面板。一位好朋友 (Benny Klingman) 使用他的Fusion 360技能獲得了很多幫助，并在該項目的其他部分擔任顧問。他為我們工作的 FAB-LAB 中碰巧擁有的激光切割機創建了“dxf”文件（我只在角落添加了我的徽標），并為所有按鈕創建了“STL”文件（我們使用了 thenounproject.com圖標）。這是添加所有電子設備之前的樣子：

在這里您可以看到按鈕布局的計劃。我使用焊接面包板來安裝按鈕并直接從另一側焊接跳線。在該設備的開發過程中多次重新焊接電線是一個錯誤的決定——更好的做法是焊接電線連接器。我將物理按鈕的 3D 打印部分粘合（用快速膠水）到電子按鈕上。我用激光切割了一塊額外的木板，并將焊接的面包板夾在兩塊木板之間，這樣在按下按鈕時就會產生反作用力。側面需要一些緩沖木部件，以防止不必要的按鈕點擊。

?

第 7.2 部分：洞穴箱。

我有一個書本形狀的盒子，所以我用黑色噴漆涂了封面，然后用激光雕刻了一些圖形。我需要切割和更換后面板的一部分，以便為所有外部連接（電源、音頻）安排一個合適的位置。

在確定如何通過外部連接穩定模塊時遇到了一些挑戰。

最后，我再次使用激光切割機切割了一塊有機玻璃，從內部鎖定模塊，從外部鎖定 3 毫米白楊木。

第 8 部分：壓軸組裝和功能

壓軸液晶代碼：

// this code is a DM consul - 1 button shows on LCD 5 random D20 result , 2nd button shows a random speel (from SD card), 3rd button shows a random monster (from SD card).
// 4 - random DM decision, 5 -random magic item, 6 -random NPC (race + trait), 7 - random gold treasure (1-500)
#include  
#include 
#include 
#include 
File myFile;
int LCD_colums = 20;
int LCD_rows = 4;
LiquidCrystal_I2C lcd(0x3F,LCD_colums,LCD_rows);  // set the LCD address to 0x27 for a 16 chars and 2 line display
int n=0;
int rnd=0;
int DLY=0;
// defining string arrays of races
char *race[22] = {"Dwarf", "Elf", "Halfling" , "Human" , "Gnome" ,"Half-orc" , "Dragonborn", "Tiefling", "Aasimar", "Warforged", 
             "Yuan-ti-Pureblood", "Triton", "Goliath", "Tabaxi", "Half-Elf" , "LizardFolk", "Genasi" , "Aarakocra" ,"Bugbear" , "Kenku", "Githyanki", "Tortle"};
// constants won't change. They're used here to set pin numbers:
const int BUTTON_PIN_D20 = 7; // the number of the d20 pushbutton pin
const int BUTTON_PIN_SPELL = 6; // the number of the spell pushbutton pin
const int BUTTON_PIN_MONSTER = 8; // the number of the monster pushbutton pin
const int BUTTON_PIN_DM = 9; // the number of the DM decision pushbutton pin
const int BUTTON_PIN_item = 5; // the number of the Magic items pushbutton pin
const int BUTTON_PIN_NPC = 4; // the number of the NPC characters pushbutton pin
const int BUTTON_PIN_gold = 3; // the number of the NPC characters pushbutton pin
// Variables will change:
int currentStateD20;    // the current reading from the input pin
int currentStateSPELL;    // the current reading from the input pin
int currentStateMONSTER;
int currentStateDM;    // the current reading from the input pin
int currentStateitem;    // the current reading from the input pin
int currentStateNPC;    // the current reading from the input pin
int currentStategold;    // the current reading from the input pin
void setup()
{
 // initialize serial communication at 9600 bits per second:
 Serial.begin(9600);
 lcd.init();                      // initialize the lcd 
 // Print a message to the LCD.
 lcd.backlight();
 lcd.setCursor(0,1);
 lcd.print(F("Hello, DM Yoni Zabow"));
   // initialize the pushbutton pin as an pull-up input
 // the pull-up input pin will be HIGH when the switch is open and LOW when the switch is closed.
 pinMode(BUTTON_PIN_D20, INPUT_PULLUP);
 pinMode(BUTTON_PIN_SPELL, INPUT_PULLUP);
 pinMode(BUTTON_PIN_MONSTER, INPUT_PULLUP);
 pinMode(BUTTON_PIN_DM, INPUT_PULLUP);
 pinMode(BUTTON_PIN_item, INPUT_PULLUP);
 pinMode(BUTTON_PIN_NPC, INPUT_PULLUP);
 pinMode(BUTTON_PIN_gold, INPUT_PULLUP);
}
// this function finds the needed line (lineNumber) in a txt file from sd card (indecated by filenmber) and shows it on the lcd screen
void printLineN(unsigned int lineNumber, unsigned int filenumber ){
 char rnd_string[LCD_colums+1] = ""; 
 rnd_string[1] = 0; 
 char cr;
 //  SD card initialization
 while (!Serial) {
 ; // wait for serial port to connect. Needed for native USB port only
 }
 Serial.print(F("Initializing SD card..."));
 if (!SD.begin(10)) {
   Serial.println(F("initialization failed!"));
   while (1);
 }
 Serial.println(F("initialization done."));
 // finding the correct file to open
 switch (filenumber) {
   case 1: {myFile = SD.open("monsters.txt");
           break;}
   case 2: {myFile = SD.open("spells.txt");
           break;}
   case 3: {myFile = SD.open("DMD.txt");
           break;}
   case 4: {myFile = SD.open("item.txt");
           break;}
   case 5: {myFile = SD.open("NPCtrait.txt");
           break;}
 }
 myFile.seek(0);
 Serial.println(F("file opened sucssesfuly."));  
 // seeking the right line in the file
 for(unsigned int i = 0; i < (lineNumber -1);){
   cr = myFile.read();
   if(cr == '\n'){
     i++;
   }
 }
 int j=0; //string index
 cr = ' '; // initialization of cr to get inside while loop
 //Now we are at the right line
 while(cr != '\n'){ 
   cr = myFile.read();
   Serial.println(cr);
   rnd_string[j] = cr;
   j++;
   //if string is bigger than LCD max columns than print to LCD and move one row down
   if (j == LCD_colums) { 
     if (rnd_string[j] == '\n') 
        rnd_string[j-1] = 0;
     else if (rnd_string[j] == '\r') 
        rnd_string[j-1] = 0;
     lcd.setCursor(0,1);
     //print first row
     lcd.print(rnd_string);
     // zero the string and the counter
     rnd_string[0] = 0;
     j=0;
   }
 }
     //closing the string without \n\r which adds unwanted char in the end
     rnd_string[j-2] = 0;
     lcd.setCursor(0,2);
     //printing the string to LCD
     lcd.print(rnd_string);
     // close the file:
     myFile.close();
}
void loop()
{
 if (DLY == 7000){
   DLY = 0;
   lcd.clear();
   lcd.setCursor(0,1);
   lcd.print(F("Hello, DM Yoni Zabow"));
 }
 // read the state of the switch/button:
 currentStateD20 = digitalRead(BUTTON_PIN_D20);
 if(currentStateD20 == LOW) 
 {
 lcd.clear();
 lcd.setCursor(1,0);
 lcd.print(F("5 X D20 roll"));
 lcd.setCursor(0,2);
 lcd.print(random(1, 21));
 lcd.setCursor(3,2);
 lcd.print(random(1, 21));
 lcd.setCursor(6,2);
 lcd.print(random(1, 21));
 lcd.setCursor(9,2);
 lcd.print(random(1, 21));
 lcd.setCursor(12,2);
 lcd.print(random(1, 21));
 DLY = 0;
 }
 // read the state of the switch/button:
 currentStateSPELL = digitalRead(BUTTON_PIN_SPELL);
 if(currentStateSPELL == LOW)
 {
  lcd.clear();
  lcd.setCursor(0,0); 
  lcd.print(F("RND Spell Name&LVL:"));
  rnd = random(1, 460);
  Serial.println(rnd);
  printLineN(rnd,2);
  DLY = 0;
 }
currentStateMONSTER = digitalRead(BUTTON_PIN_MONSTER);
if(currentStateMONSTER == LOW)
 {
  lcd.clear();
  lcd.setCursor(0,0); 
  lcd.print(F("Monster Name|AC|HP:"));
  rnd = random(1, 507);
  Serial.println(rnd);
  printLineN(rnd,1);
  DLY = 0;
 }
  currentStateDM = digitalRead(BUTTON_PIN_DM);
if(currentStateDM == LOW)
 {
  lcd.clear();
  lcd.setCursor(0,0); 
  lcd.print(F("RND DM Decision:"));
  rnd = random(1, 25);
  Serial.println(rnd);
  printLineN(rnd,3);
  DLY = 0;
 }
  currentStateitem = digitalRead(BUTTON_PIN_item);
if(currentStateitem == LOW)
 {
  lcd.clear();
  lcd.setCursor(0,0); 
  lcd.print(F("RND Magic item:"));
  rnd = random(1, 240);
  Serial.println(rnd);
  printLineN(rnd,4);
  DLY = 0;
 }
    currentStateNPC = digitalRead(BUTTON_PIN_NPC);
if(currentStateNPC == LOW)
 {
  lcd.clear();
  lcd.setCursor(0,0); 
  lcd.print(F("RND NPC Trait:"));
  rnd = random(1, 1389);
  Serial.println(rnd);
  printLineN(rnd,5);
  lcd.setCursor(0,3); 
  lcd.print("Race: ");
  lcd.setCursor(6,3);
  rnd = random(0, 21); 
  lcd.print(race[rnd]);
  DLY = 0;
 }
 currentStategold = digitalRead(BUTTON_PIN_gold);
if(currentStategold == LOW)
 {
  lcd.clear();
  lcd.setCursor(0,0); 
  lcd.print(F("RND Gold treature:"));
  rnd = random(1, 501);
  Serial.println(rnd);
  lcd.setCursor(0,2); 
  lcd.print(rnd);
  DLY = 0;
 }
 DLY++;
 Serial.println(DLY);
} 

看起來：

演示：

?