receve_num_from_serial_port

int brightness = 0; // LEDの明るさを入れる
int fadeAmount = 5; // 明るさの変更スピードを設定

int received = 0; // 受け取った値(asciiコード)
int final_value = 0; // 変換後の数字

void reset_led(){

  digitalWrite(2, LOW);
  digitalWrite(3, LOW);
  digitalWrite(4, LOW);
  digitalWrite(5, LOW);
  digitalWrite(6, LOW);
  digitalWrite(7, LOW);
}

void reset_left(){
  digitalWrite(2, LOW);
  digitalWrite(3, LOW);
  digitalWrite(4, LOW);

}

void reset_right(){
  digitalWrite(5, LOW);
  digitalWrite(6, LOW);
  digitalWrite(7, LOW);
}


void all_led(){
  digitalWrite(2, HIGH);
  digitalWrite(3, HIGH);
  digitalWrite(4, HIGH);
  digitalWrite(5, HIGH);
  digitalWrite(6, HIGH);
  digitalWrite(7, HIGH);
}

void setup() {
  Serial.begin(9600); // シリアルポートを9600bpsで開く

  //1-6番のピンを使う

  // 左
  pinMode(2, OUTPUT); //R
  pinMode(3, OUTPUT); //G
  pinMode(4, OUTPUT); //B

  // 右
  pinMode(5, OUTPUT); //R
  pinMode(6, OUTPUT); //G
  pinMode(7, OUTPUT); //B

  reset_led();
}





void loop() {

  while(Serial.available()){
    received= Serial.read(); // 1(B), 2(G), 3(R)のどれか+0(右)or1(左)をシリアル通信で受け取る
    //Serial.println(received);
    
    if (isDigit(received)) { // 数字を受け取る                     
      final_value=(final_value*10)+(received-48);
      //Serial.println(final_value);  
    }else if(received == 165){  // ¥を押すと、入力終わり                           
      Serial.println(final_value);  

       
      switch (final_value) {  // 受け取った数字に応じてLED光らせる
          case 1:
            // 左 R
            reset_left();
            digitalWrite(2, HIGH); 
            
            break;
          case 2:
            // 左 G
            reset_left();
            digitalWrite(3, HIGH); 
            break;
          case 3:
            // 左 B
            reset_left();
            digitalWrite(4, HIGH); 
            break;
          case 4:
            // 右 R
            reset_right();
            digitalWrite(5, HIGH); 
            break;
          case 5:
            // 右 G
            reset_right();
            digitalWrite(6, HIGH); 
            break;
          case 6:
            // 右 B
            reset_right();
            digitalWrite(7, HIGH); 
            break;
          default:
            all_led(); // 全部つける
        }
        final_value = 0;

        received = 999;
    }                       
              
  }
 
}