16X2 LCD屏蔽板，带4x4矩阵键盘

Question

我有个小问题。我正在尝试使用连接到arduino uno的4x4键盘在我的16x2 LCD屏蔽板上显示字符。当我按下键盘按钮时，相应的字符在串行监视器上打印成功，但在显示器上打印失败。我还应该提到，在查找字符的ASCII表后，LCD上打印的错误字符对应于重复的ASCII字符，即按1键打印1111 1111，而另一个键可能打印对应于ASCII 1011 1011的字符。基本上，ascii表中的字符从右下角到左上角。此外，当我按下一个键时，它在串行监视器上打印一次，但在LCD上打印多次。我将在下面发布我的代码，以及我正在使用的键盘和液晶屏的链接。最后，当我在显示器上打印字符/单词时，与键盘无关，它们打印正常。

代码：

#include <Keypad.h>
#include <LiquidCrystal.h> // initialize the library with the numbers of the

LiquidCrystal lcd(8, 9, 4, 5, 6, 7); 


const byte ROWS = 4; //four rows
const byte COLS = 4; //four columns
char hexaKeys[ROWS][COLS] = {
{'1','2','3','A'},
{'4','5','6','B'}, //define the cymbols on the buttons of the keypads
{'7','8','9','C'},
{'*','0','#','D'}
};   
byte rowPins[ROWS] = {13, 12, 11, 10}; //connect to the row pinouts of the         keypad
byte colPins[COLS] = {9, 8, 7, 6}; //connect to the column pinouts of the     keypad


Keypad customKeypad = Keypad( makeKeymap(hexaKeys), rowPins, colPins, ROWS,    COLS); //initialize an instance of class NewKeypad

void setup()
{
lcd.begin(16, 2);
Serial.begin(9600);
}

void loop()
{
char customKey = customKeypad.getKey();

if (customKey)
{
//lcd.setCursor(1,1); 
lcd.print(customKey);
delay(500);
Serial.print(customKey);
}
}

液晶屏：http://www.maplin.co.uk/p/16x2-lcd-shield-for-arduino-n07dh

键盘：https://www.coolcomponents.co.uk/sealed-membrane-4-4-button-pad-with-sticker.html

谢谢，希望有人能帮上忙。

Answer 1

删除if条件，然后重试。

#include <Keypad.h>
#include <LiquidCrystal.h> // initialize the library with the numbers of the

LiquidCrystal lcd(8, 9, 4, 5, 6, 7); 


const byte ROWS = 4; //four rows
const byte COLS = 4; //four columns
char hexaKeys[ROWS][COLS] = {
{'1','2','3','A'},
{'4','5','6','B'}, //define the cymbols on the buttons of the keypads
{'7','8','9','C'},
{'*','0','#','D'}
};   
byte rowPins[ROWS] = {13, 12, 11, 10}; //connect to the row pinouts of the         keypad
byte colPins[COLS] = {9, 8, 7, 6}; //connect to the column pinouts of the     keypad


Keypad customKeypad = Keypad( makeKeymap(hexaKeys), rowPins, colPins, ROWS,    COLS); //initialize an instance of class NewKeypad

void setup()
{
lcd.begin(16, 2);
Serial.begin(9600);
}

void loop()
{
char customKey = customKeypad.getKey();
//lcd.setCursor(1,1); 
lcd.print(customKey);
delay(500);
Serial.print(customKey);

}