使用C編程在Arduino微控制器上禁用鍵盤

Question

我們有一個原型，可以將大額賬單變成更小的賬單。我們使用一個帶鍵盤的Arduino微控制器，用戶應該按下鍵盤上的「0」按鈕以便機器開始一個事務。用戶可以輸入一個值來選擇他們的面值類型。例如，如果您在機器內插入100美元鈔票，用戶可以選擇是否將其作爲兩張50美元鈔票或五張20美元鈔票。

我們的原型的問題是，當機器檢測到沒有剩餘的交易金額時，用戶仍然可以使用機器進行其他交易。在我們的編碼中有一個「bug」，如果你隨機按下所有的鍵。用戶可以按「0」開始交易。如果機器檢測到沒有錢用於其他交易，我們希望禁用鍵盤。

以下是代碼，如果機器檢測到沒有帳單。如果沒有賬單，它也會通知店主。

void SupChkU(){ 
    sLBill5H = digitalRead(LBill5H); 
    if (sLBill5H == HIGH){ 
     lcd.setCursor(0, 0); 
     lcd.print("Low in resources"); 
     lcd.setCursor(0, 1); 
     lcd.print("Please see owner"); 
     delay(100); 
     Serial.println("500 Bills is empty "); 
     if (SLvlBill5H == false){ 
      SLvlBill5H = true; 
      textForSMS = "500 Bills is empty, please refill "; 
      sendSMS(textForSMS); 
     } 
     readkeyboard(); 
     if (keypressed == 11){ 
      RefillS(); 
     } 
    } 

    sLBill1H = digitalRead(LBill1H); 
    if (sLBill1H == HIGH){ 
     lcd.setCursor(0, 0); 
     lcd.print("Low in resources"); 
     lcd.setCursor(0, 1); 
     lcd.print("Please see owner"); 
     delay(100); 
     Serial.println("100 Bills is empty "); 
     if (SLvlBill1H == false){ 
      SLvlBill1H = true; 
      textForSMS = "100 Bills is empty, please refill "; 
      sendSMS(textForSMS); 
     } 
     readkeyboard(); 
     if (keypressed == 11){ 
      RefillS(); 
     } 
    } 

    sLBill50 = digitalRead(LBill50); 
    if (sLBill50 == HIGH){ 
     lcd.setCursor(0, 0); 
     lcd.print("Low in resources"); 
     lcd.setCursor(0, 1); 
     lcd.print("Please see owner"); 
     delay(100); 
     Serial.println("50 Bills is empty "); 
     if (SLvlBill50 == false){ 
      SLvlBill50 = true; 
      textForSMS = "50 Bills is empty, please refill "; 
      sendSMS(textForSMS); 
     } 
     readkeyboard(); 
     if (keypressed == 11){ 
      RefillS(); 
     } 
    } 

    if (CntB5H < 10){ 
     lcd.setCursor(0, 0); 
     lcd.print("Low in resources"); 
     lcd.setCursor(0, 1); 
     lcd.print("Please see owner"); 
     delay(100); 
     Serial.println("PhP 500 Bills Low Level"); 
     if (SLvlBill5H == false){ 
      SLvlBill5H = true; 
      textForSMS = " Low Level on PhP 500 Bills, please refill "; 
      sendSMS(textForSMS); 
     } 
     readkeyboard(); 
     if (keypressed == 11){ 
      RefillS(); 
     } 
    } 

    if (CntB1H < 10){ 
     lcd.setCursor(0, 0); 
     lcd.print("Low in resources"); 
     lcd.setCursor(0, 1); 
     lcd.print("Please see owner"); 
     delay(100); 
     Serial.println("PhP 100 Bills Low Level"); 
     if (SLvlBill1H == false){ 
      SLvlBill1H = true; 
      textForSMS = " Low Level on PhP 100 Bills, please refill "; 
      sendSMS(textForSMS); 
     } 
     readkeyboard(); 
     if (keypressed == 11){ 
      RefillS(); 
     } 
    } 

    if (CntB50 < 10){ 
     lcd.setCursor(0, 0); 
     lcd.print("Low in resources"); 
     lcd.setCursor(0, 1); 
     lcd.print("Please see owner"); 
     delay(100); 
     Serial.println("PhP 50 Bills Low Level"); 
     if (SLvlBill50 == false){ 
      SLvlBill50 = true; 
      textForSMS = " Low Level on PhP 50 Bills, please refill "; 
      sendSMS(textForSMS); 
     } 
     readkeyboard(); 
     if (keypressed == 11){ 
      RefillS(); 
     } 
    } 

    sLCoin1 = digitalRead(LCoin1); 
    if (sLCoin1 == HIGH){ 
     LvlC1 = true; 
     lcd.setCursor(0, 0); 
     lcd.print("Low for 1 Peso "); 
     lcd.setCursor(0, 1); 
     lcd.print("Please see owner"); 
     Serial.println(" Low Level for 1 Peso Bin "); 
     delay(1000); 
     if (SLvlC1 == false){ 
      SLvlC1 = true; 
      textForSMS = " Low Level for 1 Peso Bin "; 
      sendSMS(textForSMS); 
     } 
    } 
    if (sLCoin1 == LOW){ 
     SLvlC1 = false; 
    } 

    sLCoin5 = digitalRead(LCoin5); 
    if (sLCoin5 == HIGH){ 
     LvlC5 = true; 
     lcd.setCursor(0, 0); 
     lcd.print("Low for 5 Peso "); 
     lcd.setCursor(0, 1); 
     lcd.print("Please see owner"); 
     Serial.println(" Low Level for 5 Peso Bin "); 
     delay(1000); 
     if (SLvlC5 == false){ 
      SLvlC5 = true; 
      textForSMS = " Low Level for 5 Peso Bin "; 
      sendSMS(textForSMS); 
     } 
    } 
    if (sLCoin5 == LOW){ 
     SLvlC5 = false; 
    } 

    sLCoin10 = digitalRead(LCoin10); 
    if (sLCoin10 == HIGH){ 
     LvlC10 = true; 
     lcd.setCursor(0, 0); 
     lcd.print("Low for 10 Peso "); 
     lcd.setCursor(0, 1); 
     lcd.print("Please see owner"); 
     Serial.println(" Low Level for 10 Peso Bin "); 
     delay(1000); 
     if (SLvlC10 == false){ 
      SLvlC10 = true; 
      textForSMS = " Low Level for 10 Peso Bin "; 
      sendSMS(textForSMS); 
     } 
    }  
    if (sLCoin10 == LOW){ 
     SLvlC10 = false; 
    } 
} 

Answer 1

如果鍵盤連接在SPI（MISO，MOSI，SCK，...）（https://de.wikipedia.org/wiki/Serial_Peripheral_Interface），您可以通過禁用接口禁用它：

1）設置PRSPI（）位在SPCR寄存器（在PRR（功率減少寄存器）爲 '1'

2）未設置（設定 '0'）SPE位（SPI使能）？）（SPI控制寄存器）

看到您的處理器的數據表爲此，也許寄存器和位命名變化

同樣的方法（禁用接口）的工作，如果鍵盤連接在UART，...