【自作】キーボードの作り方について解説してみる

#include <Mouse.h>
#include <Keyboard.h>

//エンコーダ設定
const int Encoder_phase_A=2;
const int Encoder_phase_B=3;

volatile int Encoder_pos = 0;               //何も操作しなかったとき(エンコーダを操作しなかったとき)にコンパイラに消されることを防ぐ
volatile uint8_t AB_prev = 0;
static int count_now=0;                      //スクロールの一度の操作量を制限

//Joystick設定
const int Joystick_switch = 9;
const int Joystick_x_Axis = A1;
const int Joystick_y_Axis = A0;

int range = 25;                   //XY軸動作範囲
int center = range / 2;           //Joystick中心位置
int threshold = range / 4;        //Joystickデッドゾーン


//Arduino入力ピン割り当て
const int Key1_input = 4;

const int Key2_input = 5;
const int Key3_input = 6;
const int Key4_input = 7;

const int Key5_input = 10;
const int Key6_input = 16;
const int Key7_input = 14;
const int Key8_input = 15;


//入力ピン-入力文字割り当て
const char Key1='w';

const char Key2='a';
const char Key3='s';
const char Key4='d';

const char Key5='1';
const char Key6='2';
const char Key7='3';
const char Key8='4';


//

#define Key1_Joystick_switch KEY_LEFT_CTRL      //ショートカット用：2つ入力
const char Key2_Joystick_switch = 'z';

//プロトタイプ宣言
void Encoder();
void readAxis();

void setup() {
  //エンコーダ信号入力：A/B
  pinMode(Encoder_phase_A,INPUT_PULLUP);                //プルアップ抵抗を有効化
  pinMode(Encoder_phase_B,INPUT_PULLUP);                //プルアップ抵抗を有効化

  //Joystick信号入力：X/Y,switch
  pinMode(Joystick_switch, INPUT_PULLUP);
  pinMode(Joystick_x_Axis, INPUT);
  pinMode(Joystick_y_Axis, INPUT);

  //キー入力
  pinMode(Key1_input,INPUT_PULLUP);                //Wキー
  
  pinMode(Key2_input,INPUT_PULLUP);                //Aキー
  pinMode(Key3_input,INPUT_PULLUP);                //Sキー
  pinMode(Key4_input,INPUT_PULLUP);                //Dキー

  pinMode(Key5_input,INPUT_PULLUP);                //1キー
  pinMode(Key6_input,INPUT_PULLUP);               //2キー
  pinMode(Key7_input,INPUT_PULLUP);               //3キー
  pinMode(Key8_input,INPUT_PULLUP);               //4キー
  

  //ロータリーエンコーダ入力
  attachInterrupt(0,Encoder,CHANGE);
  attachInterrupt(1,Encoder,CHANGE);
  
  //その他
  Mouse.begin();
  Keyboard.begin();

  Serial.begin(9600);
}

void loop() {
  //Serial.println(Encoder_pos);

  //*******エンコーダ設定*******
  if(Encoder_pos == 1){
    Mouse.move(0,0,1);
  }else if(Encoder_pos == -1)
  {
    Mouse.move(0,0,-1);
  }
  Encoder_pos=0;


  //*******Joystick設定*******
  if(digitalRead(Joystick_switch) == LOW){
    Keyboard.press(Key1_Joystick_switch);
    Keyboard.press(Key2_Joystick_switch);
  }else if(digitalRead(Joystick_switch) == HIGH){
    Keyboard.release(Key1_Joystick_switch);
    Keyboard.release(Key2_Joystick_switch);
  }

  Mouse.move(readAxis(Joystick_x_Axis), (-1*readAxis(Joystick_y_Axis)),0);


  //*******キー設定*******
  if (digitalRead(Key1_input) == LOW){
    Keyboard.press(Key1);
  }else{
    Keyboard.release(Key1);
  }

    if (digitalRead(Key2_input) == LOW){
    Keyboard.press(Key2);
  }else{
    Keyboard.release(Key2);
  }

    if (digitalRead(Key3_input) == LOW){
    Keyboard.press(Key3);
  }else{
    Keyboard.release(Key3);
  }

    if (digitalRead(Key4_input) == LOW){
    Keyboard.press(Key4);
  }else{
    Keyboard.release(Key4);
  }

    if (digitalRead(Key5_input) == LOW){
    Keyboard.press(Key5);
  }else{
    Keyboard.release(Key5);
  }

    if (digitalRead(Key6_input) == LOW){
    Keyboard.press(Key6);
  }else{
    Keyboard.release(Key6);
  }

    if (digitalRead(Key7_input) == LOW){
    Keyboard.press(Key7);
  }else{
    Keyboard.release(Key7);
  }

    if (digitalRead(Key8_input) == LOW){
    Keyboard.press(Key8);
  }else{
    Keyboard.release(Key8);
  }
}


void Encoder(){
  uint8_t A=digitalRead(2);             //A相の信号を読み取る：読み取り値 0 or 1
  uint8_t B=digitalRead(3);             //B相の信号を読み取る：読み取り値 0 or 1
  

  uint8_t AB = (A << 1) | B;            //A相の読み値を1bit上位に、B相の読み値を下位に配置：2bitの2進数表現
  uint8_t ABAB = (AB_prev << 2) | AB;   //最新の読み値を下位2bitに配置、[4321]の順に配置

  if(ABAB == 0b1101 || ABAB == 0b0100 || ABAB == 0b0010 || ABAB == 0b1011 )   //正回転
  {
    Encoder_pos=1;
  }else if(ABAB == 0b1110 || ABAB == 0b0111 || ABAB == 0b0001 || ABAB == 0b1000 ) //逆回転
  {
    Encoder_pos=-1;
  }

  AB_prev=AB;       //現在のA相とB相の組み合わせ（2進数2bit）を保存しておく
}

int readAxis(int thisAxis){
  int reading = analogRead(thisAxis);            //値を読み出す
  reading = map(reading, 0, 1023, 0, range);     //ADCの値を実際の範囲に変換
  int distance = reading -center;               //正負の値に変換

  if(abs(distance) < threshold){
    distance = 0;                               //閾値以下なら、Joystickは中心位置にあるものとする：誤作動防止のデッドゾーン
  }

  return distance;
}