Keybad with i2c

رسم بياني

The Code

#include <Keypad.h> //The keypad and LCD i2c libraries

#include <Wire.h>//by hussain alarabe

#include <LCD.h>

#include <LiquidCrystal_I2C.h>

#define I2C_ADDR 0x27 //defining the LCD pins

#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

LiquidCrystal_I2C lcd(I2C_ADDR,En_pin,Rw_pin,Rs_pin,D4_pin,D5_pin,D6_pin,D7_pin);

const byte numRows= 4; //number of rows on the keypad

const byte numCols= 4; //number of columns on the keypad3.300

char keymap[numRows][numCols]=

{

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

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

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

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

};

byte rowPins[numRows] = {9,8,7,6}; //Rows 0 to 3 //if you modify your pins you should modify this too

byte colPins[numCols]= {5,4,3,2}; //Columns 0 to 3

Keypad myKeypad= Keypad(makeKeymap(keymap), rowPins, colPins, numRows, numCols);

void setup()

           {

            Serial.begin(9600);

            lcd.begin (16,2);

            lcd.setBacklightPin(BACKLIGHT_PIN,POSITIVE);

            lcd.setBacklight(HIGH);

            lcd.home ();

            lcd.print("Pressy");

            delay(2000);

           }

void loop()

{

         char keypressed = myKeypad.getKey();

         if (keypressed != NO_KEY)

             {

              lcd.clear();

              lcd.print(keypressed);

         Serial.println(keypressed); //Uncomment this to show it on the serial monitor too

              }

}

thank you