키패드

회로

https://www.tinkercad.com/things/8FmaHgzlfAF-/editel

소스코드

#include <Keypad.h>

const byte ROWS = 4; //four rows
const byte COLS = 3;  //four columns
//define the cymbols on the buttons of the keypads
char hexaKeys[ROWS][COLS] = {
{'1','2','3'},
{'4','5','6'},
{'7','8','9'},
{'#','0','*'}
};

byte rowPins[ROWS] = {
  5, 4, 3, 2}; //connect to the row pinouts of the keypad
byte colPins[COLS] = {
  6, 7, 8}; //connect to the column pinouts of the keypad

//initialize an instance of class NewKeypad
Keypad customKeypad = Keypad( makeKeymap(hexaKeys), rowPins, colPins, ROWS, COLS); 

void setup(){
  Serial.begin(9600);
}
  
void loop(){
  char customKey = customKeypad.getKey();
  
  if (customKey){
    Serial.println(customKey);
  }
}

키패드 - LCD

회로

https://www.tinkercad.com/things/jA9j2JZrHdZ-lcd/editel

소스코드

#include <Keypad.h>
#include <LiquidCrystal.h>

LiquidCrystal lcd(5, 4, 3, 2, A4, A5);


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] = {A0, A1, 11, 10}; //connect to the row pinouts of the keypad
byte colPins[COLS] = {9, 8, 7, 6}; //connect to the column pinouts of the keypad
int LCDRow = 0;


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


void setup(){
   Serial.begin(9600);
   lcd.begin(16, 2);
   lcd.setCursor(LCDRow, 0);
   }
  
void loop(){
  char key = keypad.getKey();
  
  if (key){
    Serial.println(key);
    lcd.print(key);
    lcd.setCursor (++LCDRow, 0);
  }
}