按键 com接vcc
    up，dwn，LFT,RHT,MID,SET,RST接数字引脚 1，2，3

    1. /*
    2.  *      五轴按键          Arduino
    3.  *        COM             GND
    4.  *        UP               4
    5.  *        DWN              5
    6.  *        LFT              6
    7.  *        RHT              7
    8.  *        MID              8
    9.  *        SET              9
    10.  *        RST              10
    11.  *        RGB灯           Arduino
    12.  *        R                11 
    13.  *        G                12
    14.  *        B                13
    15.  *        -                GND
    16.  * 
    17.  */
    18. #define UP 4
    19. #define DWN 5
    20. #define LFT 6
    21. #define RHT 7
    22. #define MID 8
    23. #define SET 9
    24. #define RST 10
    25. #define LED_R 11
    26. #define LED_G 12
    27. #define LED_B 13
    28. void setup()
    29. {
    30.     //上键初始化
    31.     pinMode(UP,INPUT_PULLUP);
    32.     //中间键初始化
    33.     pinMode(MID,INPUT_PULLUP);
    34.     //下键初始化
    35.     pinMode(DWN,INPUT_PULLUP);
    36.     //LED引脚初始化
    37.     pinMode(LED_R,OUTPUT);
    38.     pinMode(LED_B,OUTPUT);
    39.     pinMode(LED_G,OUTPUT);
    40.     //串口初始化
    41.     Serial.begin(9600);
    42. }
    44. void loop()
    45. {
    46.     int data_UP = digitalRead(UP);
    47.     int data_MID = digitalRead(MID);
    48.     int data_DWN = digitalRead(DWN);
    49.     if(data_UP == 0)
    50.     {
    51.         digitalWrite(LED_R,HIGH);
    52.         Serial.println("UP键被按下");
    53.         delay(200);
    54.     }
    55.     if(data_MID == 0)
    56.     {
    57.         Serial.println("中间键被按下");
    58.         digitalWrite(LED_G,!digitalRead(LED_G));
    59.         while(!data_MID)data_MID = digitalRead(MID);
    60.     }
    61.     if(data_DWN == 0)
    62.     {
    63.         Serial.println("下键被按下");
    64.         digitalWrite(LED_B,HIGH);
    65.         delay(2000);
    66.         digitalWrite(LED_B,LOW);
    67.     }
    68. }