// Old title: CPE Elective 1 - Final Activity Keypad

#include <Keypad.h>
const uint8_t ROWS = 4;
const uint8_t COLS = 4;
char keys[ROWS][COLS] = {
  { '1', '2', '3', 'A' },
  { '4', '5', '6', 'B' },
  { '7', '8', '9', 'C' },
  { 'F', '0', 'E', 'D' }
};
uint8_t colPins[COLS] = { 6, 7, 8, 9 }; // Pins connected to C1, C2, C3, C4
uint8_t rowPins[ROWS] = { 2, 3, 4, 5 }; // Pins connected to R1, R2, R3, R4
Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);

#define LED_1 13
#define LED_2 12
#define LED_3 11
#define LED_4 10

void setup() {
  for(int i = 10; i <= 13; i++){
    pinMode(i, OUTPUT);
  }
  Serial.begin(9600);
  Serial.println("Ponteras, John Apollo S. | BSCPE 03-01-01\nCounting Binary using Keypad\nButtons are in Hexidecimal Notation");
}

void allOff() {
  for(int i = 10; i <= 13; i++){
      digitalWrite(i, LOW);
    }
}

void litLED(char keyChar) {
  switch (keyChar) {
    case '1':
      digitalWrite(LED_1, HIGH);
      break;
    case '2':
      digitalWrite(LED_2, HIGH);
      break;
    case '3':
      digitalWrite(LED_1, HIGH);
      digitalWrite(LED_2, HIGH);
      break;
    case '4':
      digitalWrite(LED_3, HIGH);
      break;
    case '5':
      digitalWrite(LED_1, HIGH);
      digitalWrite(LED_3, HIGH);
      break;
    case '6':
      digitalWrite(LED_2, HIGH);
      digitalWrite(LED_3, HIGH);
      break;
    case '7':
      digitalWrite(LED_1, HIGH);
      digitalWrite(LED_2, HIGH);
      digitalWrite(LED_3, HIGH);
      break;
    case '8':
      digitalWrite(LED_4, HIGH);
      break;
    case '9':
      digitalWrite(LED_1, HIGH);
      digitalWrite(LED_4, HIGH);
      break;
    case 'A':
      digitalWrite(LED_2, HIGH);
      digitalWrite(LED_4, HIGH);
      break;
    case 'B':
      digitalWrite(LED_1, HIGH);
      digitalWrite(LED_2, HIGH);
      digitalWrite(LED_4, HIGH);
      break;
    case 'C':
      digitalWrite(LED_3, HIGH);
      digitalWrite(LED_4, HIGH);
      break;
    case 'D':
      digitalWrite(LED_1, HIGH);
      digitalWrite(LED_3, HIGH);
      digitalWrite(LED_4, HIGH);
      break;
    case 'E':
      digitalWrite(LED_2, HIGH);
      digitalWrite(LED_3, HIGH);
      digitalWrite(LED_4, HIGH);
      break;
    case 'F':
      digitalWrite(LED_1, HIGH);
      digitalWrite(LED_2, HIGH);
      digitalWrite(LED_3, HIGH);
      digitalWrite(LED_4, HIGH);
      break;
  }
}
char key;
void loop() {
  key = keypad.getKey();
  if(key != NO_KEY){
    allOff();
    litLED(key);
  }
}