#include <Keypad.h>

const uint8_t LEDS = 12;
const uint8_t ROWS = 4;
const uint*_t COLS = 4;

char keys[ROWS][COLS] ={
    {'1', '2', '3', 'A' },
    {'4', '5', '6', 'B' },
    {'7', '8', '9', 'C' },
    {'*', '0', '#', 'D' }
};
//Pins connected to LED1, LED2, LED3, ...LED12
uint8_t ledPins[LEDS] = {11,10,9,8,7,6,5,4,3,2,28,27};
uint8_t rowpins[ROWS] = {26,22,21,20}; //Pins connected to R1, R2, R3, R4
uint8_t colPins[COLS] = {19, 18, 17, 16 }; //Pins connected to C1, C2, C3, C4
keypad keypad = keypad(makekeymap(keys), roePins, colPins, ROWS, COLS);

void setup()
{
    char key = keypad.getkey();
   
    if(key ! = NO_KEY){
        switch (key){
            case '1': digitalWrite(ledPins[0], HIGH);
            break;
            case '2': digitalWrite(ledPins[1], HIGH);
            break;
            case '3': digitalWrite(ledPins[2], HIGH);
            break;
            case '4': digitalWrite(ledPins[3], HIGH);
            break;
            case '5': digitalWrite(ledPins[4], HIGH);
            break;
            case '6': digitalWrite(ledPins[5], HIGH);
            break;
            case '7': digitalWrite(ledPins[6], HIGH);
            break;
            case '8': digitalWrite(ledPins[7], HIGH);
            break
            case '9':
              for (uint8_t 1 = 0; 1 < 8; 1++){
                  digitalWrite(ledPins[1], LOW);
              }
              break;
            case '0' :
              for (uint8_t 1 = 0; 1 < 8; 1++){
                  digitalWrite(ledPins[1], LOW);
              }
            case 'A': digitalWrite(ledPins[8], HIGH);
            break;
            case 'B': digitalWrite(ledPins[9], HIGH);
            break;
            case 'C': digitalWrite(ledPins[10], HIGH);
            break;
            case 'D': digitalWrite(ledPins[11], HIGH);
            break;
            case '*':
              for (uint8_t 1 = 8; 1 < 12; 1++){
                  digitalWrite(ledPins[1], HIGH);
              }
              break;
            case '#' :
              for (uint8_t 1 = 0; 1 < 12; 1++){
                  digitalWrite(ledPins[1], LOW);
                  }
            break;
        }
    }
    delay(10);