//ArduinoIDEにコピーして使います。　by Paradise
  1. #include <Wire.h> //Include the Wire.h library so we can communicate with the Nunchuck
  2. #define I2C_SDA 21 // Nuncuck SDA input ESP32=21 C3=8
  3. #define I2C_CLK 22 // Nuncuck CLK input ESP32=22 C3=9
  4. uint8_t nunbuff[12];
  5. int cnt = 0;
  6. int x_val = 0; // 1byte Data
  7. int y_val = 0; // 1byte Data
  8. int z_val = 0; // 1byte Data
  10. void setup () {
  11.   Serial.begin (115200);
  12.   Wire.begin();
  13.   nunchuck_init();
  14. }
  16. void nunchuck_init() {
  17.   Wire.beginTransmission(0x52); // transmit to device 0x52
  18.   Wire.write(0x40); // sends memory address *(blackNunchuck:0xF0）
  19.   Wire.write(0x00); // sends sent a zero. *(blackNunchuck:0x55）
  20.   Wire.endTransmission(); // stop transmitting
  21. }
  23. void send_zero() {
  24.   Wire.beginTransmission(0x52); // transmit to device 0x52
  25.   Wire.write(0x00); // sends one byte
  26.   Wire.endTransmission(); // stop transmitting
  27. }
  28. void loop () {
  29.   Wire.requestFrom(0x52, 6); // request data from nunchuck
  30.   while (Wire.available()) {
  31.     nunbuff[cnt] = nunchuk_decode_byte(Wire.read());
  32.     cnt++;
  33.   }
  34.   int z = 0;
  35.   int c = 0;
  37.   if (cnt >= 5) {
  38.     x_val = nunbuff[0];
  39.     y_val = nunbuff[1];
  40.     x_val = x_val + 4; //最初に誤差補正をして置くこと
  41.     y_val = y_val - 6; //最初に誤差補正をして置くこと
  42.     Serial.print(" x_val = ");
  43.     Serial.print(x_val);
  44.     Serial.print(" y_val = ");
  45.     Serial.print(y_val);
  46.     Serial.print(" z_val = ");
  47.     Serial.println(z_val);
  49.     if ((nunbuff[5] >> 0) & 1) z = 1; // The first bit of data of the 5byte (Nuncuck Z-button)
  50.     if ((nunbuff[5] >> 1) & 1) c = 1; // The second bit of data of the 5byte (Nuncuck C-button)
  51.     if ((z == 1) & (c == 1)) z_val = 0;
  52.     if ((z == 0) & (c == 1)) z_val = 1;
  53.     if ((z == 1) & (c == 0)) z_val = 2;
  54.     if ((z == 0) & (c == 0)) z_val = 3;
  55.     delay(1);
  56.   }
  57.   cnt = 0;
  58.   send_zero(); // send the request for next bytes
  59.   delay(10);
  60. }
  62. char nunchuk_decode_byte (char x) {
  63.   x = (x ^ 0x17) + 0x17;
  64.   return x;
  65. }