//读分量测试----------------int keyboardPin = 0;    //模拟口0 int keyboardValue = 0;   // 取得键AD模拟分量 void setup() {   //通信波特率   Serial.begin(9600);  } void loop() {   keyboardValue = analogRead(keyboardPin); // read the pot value     Serial.println(keyboardValue);      // 串口打印   delay(1000);                   }---------------------------------------------------------int keypressed = 0;int keyboardPin = 0;    int keyboardValue = 0;  void setup(){  Serial.begin(9600); }void loop(){  keyboardValue = analogRead(keyboardPin); //AD分量范围2的10次方 while (keyboardValue < 25){   //监听模拟口 keyboardValue = analogRead(keyboardPin);  delay(50);              readkeyboard();  }void readkeyboard(){   keyboardValue = analogRead(keyboardPin);   if (keyboardValue <25){keypressed = 0;}   if ((keyboardValue >25) && (keyboardValue < 67)){keypressed = 1;}   if ((keyboardValue >67) && (keyboardValue < 108)){keypressed = 2;}   if ((keyboardValue >108) && (keyboardValue < 162)){keypressed = 3;}   if ((keyboardValue >162) && (keyboardValue < 253)){keypressed = 4;}   if ((keyboardValue >253) && (keyboardValue < 361)){keypressed = 5;}   if ((keyboardValue >361) && (keyboardValue < 479)){keypressed = 6;}   if ((keyboardValue >479) && (keyboardValue < 619)){keypressed = 7;}   if ((keyboardValue >619) && (keyboardValue < 765)){keypressed = 8;}   if ((keyboardValue >765) && (keyboardValue < 819)){keypressed = 9;}   if ((keyboardValue >819) && (keyboardValue < 889)){keypressed = 0;}   if ((keyboardValue >889) && (keyboardValue < 938)){keypressed = 0;}   if (keyboardValue >938){keypressed = 0;}   while (keyboardValue > 25) {     delay (100);     keyboardValue = analogRead(keyboardPin);   }   Serial.println(keypressed);        delay(1000);                                         }