c - 带 4x4 矩阵键盘的 16X2 LCD 屏蔽

Question

我有一个小问题。我试图在我的 16x2 LCD 屏蔽上显示字符，带有连接到 arduino uno 的 4x4 键盘。当我按下键盘按钮时，相应的字符在串行监视器上成功打印，但不是 dsplay。 我还应该提到，在查找字符的 ASCII 表后，LCD 上打印的不正确字符对应于重复的 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.本质上是ascii表中的字符从右下角到左上角。此外，当我按下一个键时，它会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 LCD 屏蔽的链接。最后一点，当我在显示器上打印字符/单词时，它们与键盘无关，它们打印得很好。

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，希望有人能帮忙。

Answer 1

移除 if 条件并尝试。

#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);

}