Arduino 4X3键盘 AD模拟分量实现

//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);                  

 }

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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);                    

                     }