4X4 鍵盤鍵入實驗區

第一個程式碼

#include <Keypad.h>

#include <Wire.h>

#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27,16,2); // 設定 LCD 位置為 0x27 並設為 16 X2

//顯示模式

const byte ROWS = 4; //four rows

const byte COLS = 4; //three columns

char keys[ROWS][COLS] = {

{'1','2','3','A'},

{'4','5','6','B'},

{'7','8','9','C'},

{'*','0','#','D'}

};

byte rowPins[ROWS] = {2,3,4,5};

byte colPins[COLS] = {6,7,8,9};

Keypad keypad = Keypad( makeKeymap(keys), rowPins, colPins, ROWS, COLS );

void setup(){

lcd.init(); // 初始化 lcd

lcd.backlight();

lcd.print("Your pressedkey=>");

}

void loop(){

char key = keypad.getKey();

if (key != NO_KEY){

lcd.setCursor(0, 1);

lcd.print(key);

}

}

第二個程式碼

#include <Wire.h>

#include <LiquidCrystal_I2C.h>

#include <Keypad.h>

//constants for LEDs

int greenLED = 12;

int redLED = 13;

//set our code

char* ourCode = "1234";

int currentPosition = 0;

//define the keypad

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] = {2,3,4,5};

byte colPins[cols] = {6,7,8,9};

Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, rows, cols);

LiquidCrystal_I2C lcd(0x27,16,2); // set the LCD address to 0x27 for a 16 chars and 2 line display

void setup()

{

lcd.init(); //初始化LCD

lcd.backlight();

displayCodeEntryScreen(); //LCD顯示輸入密碼訊息

pinMode(redLED, OUTPUT);

pinMode(greenLED, OUTPUT);

digitalWrite(redLED, LOW);

digitalWrite(greenLED, LOW);

}

void loop()

{

int l;

char key = keypad.getKey(); //擷取按鍵狀況

if (int(key) != 0) { //若有按鍵狀況發生時

lcd.setCursor(0,1);

lcd.print(" ");

lcd.setCursor(0,1);

for (l=0; l<=currentPosition; ++l)

{

lcd.print("*");

}

if (key == ourCode[currentPosition])

{

++currentPosition;

if (currentPosition == 4)

{

unlockDoor();

currentPosition = 0;

}

} else {

invalidCode();

currentPosition = 0;

}

}

}

void invalidCode()

{

digitalWrite(redLED, HIGH);

clearScreen();

lcd.setCursor(0,0);

lcd.print("*ACCESS DENIED!*");

lcd.setCursor(0,1);

lcd.print("**INVALID CODE**");

delay(5000);

digitalWrite(redLED, LOW);

displayCodeEntryScreen();

}

void unlockDoor()

{

digitalWrite(greenLED, HIGH);

clearScreen();

lcd.setCursor(0,0);

lcd.print("*ACCESS GRANTED*");

lcd.setCursor(0,1);

lcd.print("** WELCOME!! **");

//add any code to unlock the door here

delay(5000);

digitalWrite(greenLED, LOW);

displayCodeEntryScreen();

}

void displayCodeEntryScreen()

{

clearScreen();

lcd.setCursor(0,0);

lcd.print("Please EnterCode");

lcd.setCursor(0,1);

lcd.print("");

}

void clearScreen()

{

lcd.setCursor(0,0);

lcd.print(" ");

lcd.setCursor(0,1);

lcd.print(" ");

}