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這是4*4鍵盤及LCD螢幕顯示器的程式
#include <Keypad.h>
#include <Wire.h>
#include <LCD.h>
#include <LiquidCrystal_I2C.h>
//#define LCMIIC1
//#define LCMIIC2
#define LCMIIC3
/*-----( Declare Constants )-----*/
#if defined(LCMIIC1)
#define I2C_ADDR 0x20 // Define I2C Address
#define BACKLIGHT_PIN 7
#define En_pin 4
#define Rw_pin 5
#define Rs_pin 6
#define D4_pin 0
#define D5_pin 1
#define D6_pin 2
#define D7_pin 3
#define BACKLIGHT_FLAG NEGATIVE
#elif defined(LCMIIC2)
#define I2C_ADDR 0x27 // Define I2C Address
#define BACKLIGHT_PIN 3
#define En_pin 2
#define Rw_pin 1
#define Rs_pin 0
#define D4_pin 4
#define D5_pin 5
#define D6_pin 6
#define D7_pin 7
#define BACKLIGHT_FLAG POSITIVE
#elif defined(LCMIIC3)
#define I2C_ADDR 0x20 // Define I2C Address
#define BACKLIGHT_PIN 3
#define En_pin 2
#define Rw_pin 1
#define Rs_pin 0
#define D4_pin 4
#define D5_pin 5
#define D6_pin 6
#define D7_pin 7
#define BACKLIGHT_FLAG POSITIVE
#else // error
#error LCM not defined
#endif
#define LED_OFF 0
#define LED_ON 1
// initialize the library with the numbers of the interface pins
LiquidCrystal_I2C lcd(I2C_ADDR,En_pin,Rw_pin,Rs_pin,D4_pin,D5_pin,D6_pin,D7_pin);
// 3x4 Keypad
const byte ROWS = 4; // 4 Rows
const byte COLS = 4; // 3 Columns
// 定義 Keypad 的按鍵
char keys[ROWS][COLS] = {
{'1','2','3','A'},
{'4','5','6','B'},
{'7','8','9','C'},
{'*','0','#','D'}
};
// 定義 Keypad 連到 Arduino 的接腳
byte rowPins[ROWS] = {2, 3,4, 5}; // 連到 Keypad 的 4 個 Rows: Row0, Row1, Row2, Row3
byte colPins[COLS] = {6, 7,8, 9}; // 連到 Keypad 的 3 個 Columns: Column0, Column1, Column2
// 建立 Keypad 物件
Keypad keypad = Keypad( makeKeymap(keys), rowPins, colPins, ROWS, COLS );
void setup()
{
Serial.begin(9600);
lcd.begin (16,2);
lcd.print("password:");
lcd.setBacklightPin(BACKLIGHT_PIN,BACKLIGHT_FLAG);
lcd.setBacklight(LED_ON);
lcd.setCursor(0, 1);
lcd.cursor(); // 顯示游標
lcd.blink(); // 讓游標閃爍
}
void loop() {
// 讀取 Keypad 的輸入
char key = keypad.getKey();
// NO_KEY 代表沒有按鍵被按下
if (key != NO_KEY){
Serial.println(key);
lcd.print(key);
}
if(key == '*'){
lcd.clear();
lcd.print("Password:");
lcd.setCursor(0, 1);
}
} |
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