4x4 Matrix 16 Keypad Keyboard Module [S025]

4x4 Matrix 16 Keypad Keyboard Module [S025]

https://www.youtube.com/watch?v=VQytr1awNRM

*GitHub : https://github.com/rdiot/rdiot-s025.git

* Specs

4x4 Matrix

Keypad Keyboard module 16 Button

Size: Approx.42mmX42mm / 1.65x1.65

* Contents

1) row = (1, 2, 3, 4) PIN

2) column = (5, 6, 7, 8) PIN 

- Connect

1 ----- D2

2 ----- D3

3 ----- D4

4 ----- D5

5 ----- D6

6 ----- D7

7 ----- D8

8 ----- D9

- Library : ttp://playground.arduino.cc/uploads/Code/keypad.zip

- Key Code

#include <Wire.h> 

#include <LiquidCrystal_I2C.h>

#include <Keypad.h>

LiquidCrystal_I2C lcd(0x27,20,4);  // LCD2004

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

const byte numCols= 4; //number of columns on the keypad

//keymap defines the key pressed according to the row and columns just as appears on the keypad

char keymap[numRows][numCols]= 

{

  {'0','1','2','3'},

  {'4','5','6','7'},

  {'8','9','A','B'},

  {'C','D','E','F'}

};

byte rowPins[numRows] = {2,3,4,5}; //Rows 0 to 3

byte colPins[numCols]= {6,7,8,9}; //Columns 0 to 3

//initializes an instance of the Keypad class

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

void setup()

{

  lcd.init();  // initialize the lcd 

  lcd.backlight();

  lcd.print("start LCD2004");

  delay(1000);

  lcd.clear();

}

void loop()

{

 

  lcd.setCursor(0,0);

  lcd.print("S025:4x4 16 keypad");

  char keypressed = myKeypad.getKey();

  if (keypressed != NO_KEY)

  {

   // Serial.print(keypressed);

    lcd.setCursor(0,1);

    lcd.print("keypressed=" + (String)keypressed + "  ");

    switch (keypressed)

    {

      case '0':

           lcd.setCursor(0,2);

           lcd.print("if=0, then action");      

        break;

      case 'F':

           lcd.setCursor(0,2);

           lcd.print("if=F, then action");      

        break;  

      default:

          lcd.setCursor(0,2);

           lcd.print("if=defulat       "); 

        break;

    }

  }

}