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

LiquidCrystal lcd(23, 25, 27, 29, 31, 33);

const uint8_t ROWS = 4;
const uint8_t COLS = 4;

const int Led[] = {35, 37, 39, 41, 43, 45}; 
int len = sizeof(Led) / sizeof(int);

char keys[ROWS][COLS] = {
  { '1', '2', '3', 'A' },
  { '4', '5', '6', 'B' },
  { '7', '8', '9', 'C' },
  { '*', '0', '#', 'D' }
};

uint8_t colPins[COLS] = { 5, 4, 3, 2 }; // Pins connected to C1, C2, C3, C4
uint8_t rowPins[ROWS] = { 9, 8, 7, 6 }; // Pins connected to R1, R2, R3, R4

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

int Num = 0;

void setup() {
  for(int i = 0; i < len; i++){
    pinMode(Led[i], OUTPUT);
  }

  Serial.begin(9600);
}

void loop() {
  char key = keypad.getKey();
  
  if (key != NO_KEY && key != 'D') {
    if(Num == 0){
      lcd.begin(16, 2);
    }
    lcd.print(key);
    Num *= 10;
    Num += (int)(key - '0');

  }
  else if(key == 'D'){
    Serial.println(Num);
    int i;
    for(i = 0; i < 2 * (100 - Num); i += 2){
      digitalWrite(Led[i], HIGH);
      digitalWrite(Led[i + 1], LOW);
 
    }
    for(i; i < 2 * len; i += 2){
      digitalWrite(Led[i], LOW);
      digitalWrite(Led[i + 1], HIGH);
    }

    Num = 0;

  }  
}