[ arduino ] 키패드를 사용해서 비밀번호 확인하기 > arduino

#include <Keypad.h>

const byte ROWS = 4; //four rows

const byte COLS = 3; //three columns

char keys[ROWS][COLS] = {

  {'1', '2', '3'},

  {'4', '5', '6'},

  {'7', '8', '9'},

  {'*', '0', '#'}

};

byte rowPins[ROWS] = {7, 2, 3, 5}; //connect to the row pinouts of the keypad

byte colPins[COLS] = {6, 8, 4}; //connect to the column pinouts of the keypad

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

void setup() {

  Serial.begin(9600);

  pinMode(11, OUTPUT);

  pinMode(12, OUTPUT);

  pinMode(13, OUTPUT);

}

String a = "3333";

String b = "";

boolean state = false;

void loop() {

  char key = keypad.getKey();

  if (key) {

    Serial.print(key);

    if (key == '*') {

      if (b == a) {

        //Serial.print(b);

        Serial.println("OK");

        digitalWrite(11, HIGH);

        digitalWrite(12, HIGH);

        digitalWrite(13, HIGH);

        b = "";

      } else {

        //Serial.print(b);

        Serial.println("NO");

        b = "";

      }

    } else {

      b += key;

    }

  }

}