使用1602显示矩阵按键数字的方法1
#include "Keypad.h"
#include <LiquidCrystal.h>
unsigned char k=0;
unsigned char m=0;
LiquidCrystal lcd(8, 9, 10, 11, 12, 13);//RS E DB4 DB5 DB6 DB7
const byte ROWS = 4;
const byte COLS = 4;
char keys[ROWS][COLS] = {
{'1','2','3','A'},
{'4','5','6','B'},
{'7','8','9','C'},
{'*','0','#','D'}
};
byte rowPins[ROWS] = {0, 1, 2, 3};
byte colPins[COLS] = {4, 5, 6, 7};
Keypad keypad = Keypad( makeKeymap(keys), rowPins, colPins, ROWS, COLS );
void setup()
{
lcd.begin(16,2);
lcd.clear();
Serial.begin(9600);
}
void readKeyboard()
{
char key = keypad.getKey();
if (key!=NO_KEY){
switch(key)
{
case '1' : k=1;break;
case '2' : k=2;break;
case '3' : k=3;break;
case '4':k=4;break;
case '5':k=5;break;
case '6':k=6;break;
case '7':k=7;break;
case '8':k=8;break;
case '9':k=9;break;
case '*':k=10;break;
case '0':k=11;break;
case '#':k=12;break;
case 'A' : k=13;break;
case 'B' : k=14;break;
case 'C':k=15;break;
case 'D':k=16;m++;break;
default:break;
}
}
}
void loop()
{
readKeyboard();
lcd.setCursor(0,0);
lcd.print(k);
}