电脑的设备管理器没有检测到板子USB

电脑的设备管理器没有检测到板子USB，是因为板子电路没有通的原因吗？但是电脑有一个电流上涌的警告

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• 帮你找了个相似的问题, 你可以看下: https://ask.csdn.net/questions/752589
• 你也可以参考下这篇文章：未隔离电源设备使用usb转串口调试导致串口模块爆炸烧坏事故记录
• 除此之外, 这篇博客: 如何把老式键盘转换成USB键盘并且自己编程？中的 完整代码 部分也许能够解决你的问题, 你可以仔细阅读以下内容或跳转源博客中阅读:
  

   

  #include "Keyboard.h"
  #include <PS2KeyAdvanced.h>
  
  //最新的，用于PS2转换到USB
  
  
  
  //sample以A为例:按下代码 释放代码
  //一般：     41 8041
  //CAPS LOCK下：    1041 9041
  //SHIFT按住情况下： 4041 C041
  //SHIFT按键：4106 8106
  
  
  
  /* Keyboard constants  Change to suit your Arduino
     define pins used for data and clock from keyboard */
  #define DATAPIN 2
  #define IRQPIN  3
  #define UPPER 40
  #define RELEASE_UPPER C0
  #define SHIFTMODE 0x40
  #define FUNCTION 0x80
  
  uint16_t c;
  
  PS2KeyAdvanced keyboard;
  
  
  void setup( )
  {
    // Configure the keyboard library
    keyboard.begin( DATAPIN, IRQPIN );
    Serial.begin( 115200 );
    Serial.println( "PS2 Advanced Key Simple Test:" );
    Keyboard.begin();
  }
  
  
  void loop( )
  {
    if ( keyboard.available( ) )
    {
      // read the next key
      c = keyboard.read( );
      //For DEBUG
      if ( c > 0 )
      {
        //  DisValue(c);//DEBUG用的，获取c的具体值，状态符号和按键值
      }
      //ACTION
      if ((c & 0xFF) > 0) //判断获取的按键值c有没有大于0
      {
        DisValue(c);
        switch (c >> 8)
        {
          case 0x10://大写锁定下按下字母
            UpperKey(c);
            break;
          case 0x90://大写锁定下释放字母
            UpperKey_Release(c);
            break;
          case 0x40://SHIFT大写按下
            UpperKey(c);
            break;
          case 0xC0://SHIFT大写释放
            UpperKey_Release(c);
            break;
          case 0x11:
            if (c == 0x111D)
            {
              Keyboard.press(KEY_TAB);
            }
            break;
          case 0x91:
            if (c == 0x911D)
            {
              Keyboard.release(KEY_TAB);
            }
            break;
  
          case 0x00://一般按键按下
            standardKey(c);
          case 0x80://一般按键释放
            standardKey_Release(c);
            break;
          case 0x01://功能按键
            FuncKey(c);
            break;
          case 0x81://功能键和SHIFT键释放
            Serial.println( "FUNC RELEASE" );
            FuncKey_Release(c);
  
            break;
          case 0x41://SHIFT键按下
  
            break;
            break;
          case 0x20://CTRL Press And
            Keyboard.press(KEY_LEFT_CTRL);
            standardKey(c);
            break;
          case 0xA0://CTRL Release
            Keyboard.release(KEY_LEFT_CTRL);
            standardKey_Release(c);
            break;
          case 0x21: //CTRL
            Serial.println( "CTRL PRESS" );
            Keyboard.press(KEY_LEFT_CTRL);
            break;
          case 0x9: //LEFT-ALT
            Serial.println( "L-ALT PRESS" );
            Keyboard.press(KEY_LEFT_ALT);
            break;
          case 0x5: //RIGHT-ALT
            Serial.println( "R-ALT PRESS" );
            Keyboard.press(KEY_RIGHT_ALT);
            break;
          default:
            Serial.print( " Unknow Higher code: " );
            Serial.println( c >> 8, HEX );
        }
        // Keyboard.press(c);
      }
    }
  }
  
  ///////////////////////
  /*
    Descript: For DEBUG
  
  *///////////////////////
  void DisValue(unsigned int c)
  {
    Serial.print( "Value " );
    Serial.print( c, HEX );
    Serial.print( " - Status Bits " );
    Serial.print( c >> 8, HEX );
    Serial.print( "  Code " );
    Serial.println( c & 0xFF, HEX );
  }
  
  
  ///////////////////////
  /*
    Descript: abcde and so on,main key
  
  *///////////////////////
  #define LEFT_WIN 0x008B//press
  #define CAPELOCK 0x00FA//press
  void standardKey(unsigned int c)
  {
    int key = c << 8;
    Serial.print("Stand press :");
    if(remap(c)!=0)
    {
      Keyboard.press(remap(c));
      return;
    }
    if (((key >> 8) >= '@') && ((key >> 8) <= 'Z'))
    {
      Serial.write((key >> 8) + (97 - 65)); //输出小写字符
      Keyboard.press(c + ' ');
    }
  
    else
    {
      Serial.write((key >> 8)); //输出其他的字符
      Keyboard.press(c);
    }
  
    Serial.println("");
  
  
  }
  
  //return 0: not found
  unsigned char remap(unsigned int c)
  {
    unsigned int key = c << 8;
    unsigned char remap_char=0; 
    switch (key>>8)
    {
      case 0x3E:
      remap_char = '/';
      break;
      case 0x3B:
      remap_char = ',';
      break;
      case 0x3A:            //按键[']
      remap_char = 0x27;
      break;
      case 0x8B:
      remap_char = KEY_LEFT_GUI;
      break;
      case 0x3D:
      remap_char = '.';
      break;
      case 0xFA:
      remap_char = KEY_CAPS_LOCK;
      break;
      default:
      break;
    }
    return remap_char;
  }
  
  //CODE:0x 80??
  void standardKey_Release(unsigned int c)
  {
    int key = c << 8;
    Serial.print("Stand Release :");
    if(remap(c)!=0)
    {
      Keyboard.release(remap(c));
      return;
    }
    if (((key >> 8) >= 'A') && ((key >> 8) <= 'Z'))
    {
      Serial.write((key >> 8) + (97 - 65)); //输出小写字符
      Keyboard.release(c + ' ');
    }
  
    else
    {
      Serial.write((key >> 8)); //输出其他的字符
      Keyboard.release(c);
    }
  
    Serial.println("");
  
  }
  void UpperKey(unsigned int c)
  {
    int key = c << 8;
    unsigned int chara;
    Serial.print("Upper press :");
    if (c == 0x403A) //["]
    {
      Keyboard.press(0x22);
      return;
    }
    if ((key >> 8) >= '0' && (key >> 8) <= '9')
    {
      switch (key >> 8)
      {
        case '0':
          chara = ')';
          break;
        case '1':
          chara = '!';
          break;
        case '2':
          chara = '@';
          break;
        case '3':
          chara = '#';
          break;
        case '4':
          chara = '$';
          break;
        case '5':
          chara = '%';
          break;
        case '6':
          chara = '^';
          break;
        case '7':
          chara = '&';
          break;
        case '8':
          chara = '*';
          break;
        case '9':
          chara = '(';
          break;
        default:
  
          break;
      }
      Serial.write(chara);
      Serial.println("");
      Keyboard.press(chara);
    }
    else
    {
  
      Serial.write(key >> 8);
      Serial.println("");
      Keyboard.press(key >> 8);
    }
  
  }
  
  void UpperKey_Release(unsigned int c)
  {
    int key = c << 8;
    Serial.print("Upper release :");
    Serial.write(key >> 8);
    if (c == 0xC03A) //["]
    {
      Keyboard.release(0x22);
      return;
    }
    Serial.println("");
    Keyboard.releaseAll();
  }
  void rep(String s)
  {
    Serial.print("Func press:");
    Serial.println(s);
  }
  void FuncKey(unsigned int c)
  {
    int key = c << 8;
    switch (key >> 8)
    {case 0x1B :
        rep("ESC");
  
        Keyboard.press(KEY_ESC);
        break;
      case PS2_KEY_ENTER :
        rep("ENTER");
  
        Keyboard.press(0x28);
        break;
      case PS2_KEY_SPACE:
        rep("SPACE");
        Keyboard.press(0x20);
        break;
      case PS2_KEY_TAB :
        rep("TAB");
        Keyboard.press(KEY_TAB);
        break;
      case PS2_KEY_DELETE :
        rep("DELETE");
        Keyboard.press(KEY_DELETE);
        break;
      case PS2_KEY_INSERT :
        Keyboard.press(KEY_INSERT);
        rep("INSERT");
        break;
      case PS2_KEY_UP_ARROW :
        rep("UP");
        Keyboard.press(KEY_UP_ARROW);
        break;
      case PS2_KEY_DN_ARROW :
        Keyboard.press(KEY_DOWN_ARROW     );
        rep("DOWN");
        break;
      case PS2_KEY_L_ARROW :
        Keyboard.press(KEY_LEFT_ARROW   );
        rep("L_ARROW");
        break;
      case PS2_KEY_R_ARROW :
        Keyboard.press(KEY_RIGHT_ARROW);
        rep("R_ARROW");
        break;
      case PS2_KEY_PGDN :
        Keyboard.press(KEY_PAGE_DOWN   );
  
        rep("PGDN");
        break;
      case PS2_KEY_PGUP :
        Keyboard.press(KEY_PAGE_UP    );
        rep("PGUP");
        break;
      case PS2_KEY_END :
        Keyboard.press(KEY_END     );
        rep("END");
        break;
      case PS2_KEY_HOME:
        Keyboard.press(KEY_HOME  );
        rep("HOME");
        break;
      case PS2_KEY_SYSRQ :
        Keyboard.press(PS2_KEY_SYSRQ);
        rep("SYSRQ");
        break;
      case PS2_KEY_BACK:
        Keyboard.press(PS2_KEY_BACK);
        rep("BACK");
        break;
      case 0x04:
        rep("PRINT SCREEN");
        break;
      case PS2_KEY_F1 :
        rep("F1");
        Keyboard.press(KEY_F1);
        break;
      case PS2_KEY_F2 :
        rep("F2");
        Keyboard.press(KEY_F2);
        break;
      case PS2_KEY_F3 :
        rep("F3");
        Keyboard.press(KEY_F3);
        break;
      case PS2_KEY_F4 :
        rep("F4");
        Keyboard.press(KEY_F4);
        break;
      case PS2_KEY_F5 :
        rep("F5");
        Keyboard.press(KEY_F5);
        break;
      case PS2_KEY_F6 :
        rep("F6");
        Keyboard.press(KEY_F6);
        break;
      case PS2_KEY_F7 :
        rep("F7");
        Keyboard.press(KEY_F7);
        break;
      case PS2_KEY_F8 :
        rep("F8");
        Keyboard.press(KEY_F8);
        break;
      case PS2_KEY_F9 :
        rep("F9");
        Keyboard.press(KEY_F9);
        break;
      case PS2_KEY_F10 :
        rep("F10");
        Keyboard.press(KEY_F10);
        break;
      case PS2_KEY_F11 :
        rep("F11");
        Keyboard.press(KEY_F11);
        break;
      case PS2_KEY_F12 :
        rep("F12");
        Keyboard.press(KEY_F12);
        break;
      case PS2_KEY_F13 :
        rep("F13");
        break;
      case 0x1C:
        Keyboard.press(KEY_BACKSPACE);
        break;
      default:
        Serial.print("UNKNOW CODE:");
        Serial.println(c, HEX);
  
    }
  }
  void FuncKey_Release(unsigned int c)
  {
  
    // Keyboard.release(c);
    Keyboard.releaseAll();
  }
  void KeyBoard_Press(unsigned int c)
  {
    Keyboard.press(c);
  }
  void KeyBoard_Release(unsigned int c)
  {
    Keyboard.release(c);
  }

   

   

   

   

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