#include <LiquidCrystal_I2C.h>
#include <Keypad.h>

LiquidCrystal_I2C lcd(0x27,20,4);  // set the LCD address to 0x27 for a 16 chars and 2 line display
unsigned long cas = 0;  //premenna pre cas
int led = 10; // PWM pin pre LED
float per = 0;  //Nastavenie percent /100

// Rozlozenie klavesnice (4x4)
const byte ROWS = 4; // four rows
const byte COLS = 4; // four columns

// definovanie klavesov
char hexaKeys[ROWS][COLS] = {
  {'1', '2', '3', 'A'},
  {'4', '5', '6', 'B'},
  {'7', '8', '9', 'C'},
  {'*', '0', '#', 'D'}
};
  //Matica znakov
int znak[11][8] = {
  {1,1,1,1,1,1,0,1},
  {0,1,1,0,0,0,0,1},
  {1,1,0,1,1,0,1,1},
  {1,1,1,1,0,0,1,1},
  {0,1,1,0,0,1,1,1},
  {1,0,1,1,0,1,1,1},
  {1,0,1,1,1,1,1,1},
  {1,1,1,0,0,0,0,1},
  {1,1,1,1,1,1,1,1},
  {1,1,1,0,0,1,1,1},
  {1,0,0,0,1,1,1,0}
};

byte colPins[ROWS] = {5, 4, 3, 2}; // Pins used for the rows of the keypad
byte rowPins[COLS] = {9, 8, 7, 6}; // Pins used for the columns of the keypad

// inicializovanie klavesnice
Keypad customKeypad = Keypad(makeKeymap(hexaKeys), rowPins, colPins, ROWS, COLS);


void setup()
{
  pinMode(led, OUTPUT); //Nastav pin pre led na vystup
  Serial.begin(9600);
  lcd.init();                      // initialize the lcd
  // Print a message to the LCD.
  lcd.backlight();
  lcd.setCursor(0,0);
  lcd.print("Zadanie 2");
  lcd.setCursor(2,1);
  lcd.print("Samuel");
  delay(2000);
  lcd.clear();
}

void zobraz(String(btt))
{
    //Vykreslenie znaku
  delay(50);  //Oneskorenie pred zmenou stavu led (min. 30)
  float led1=255*(per/10);  //Prepocet intenzity led
  lcd.setCursor(0,1);
  lcd.print("        ");
  lcd.setCursor(0,1);
  lcd.print(per*10);
  lcd.print(" %");
  delay(50);  //Oneskorenie pred zmenou stavu led (min. 30)
  Serial.print("Tlacidlo ");
  Serial.print(btt); //Vypis na seriovy port
  Serial.print(" Hodnota "); //Vypis na seriovy port
  Serial.println(led1); //Vypis na seriovy port
  analogWrite(led,led1);  //Zmena stavu led
}

void loop()
{
lcd.setCursor(0,0);   //nastavy kurzor 
cas  = millis()/60/10;  //prepocet na sekundy
lcd.print("Cas ");
lcd.print(cas); //zobrazi cas 
lcd.print(" s");

char button = customKeypad.getKey(); //Nacita stlacene tlacidlo
  if (String(button)=="0") {  //Ak je stlacene tlacidlo "0"
    per = 0;  //Nastavenie percent /100
    zobraz(String(button)); //Zobrazenie znaku a zmena stavu led
  }
  else if (String(button)=="1") {
    per = 1;
    zobraz(String(button));
  }
  else if (String(button)=="2") {
    per = 2;
    zobraz(String(button));
  }
  else if (String(button)=="3") {
    per = 3;
    zobraz(String(button));
  }
  else if (String(button)=="4") {
    per = 4;
    zobraz(String(button));
  }
  else if (String(button)=="5") {
    per = 5;
    zobraz(String(button));
  }
  else if (String(button)=="6") {
    per = 6;
    zobraz(String(button));
  }
  else if (String(button)=="7") {
    per = 7;
    zobraz(String(button));
  }
  else if (String(button)=="8") {
    per = 8;
    zobraz(String(button));
  }
  else if (String(button)=="9") {
    per = 9;
    zobraz(String(button));
  }
  else if (String(button)=="A" || String(button)=="B" || String(button)=="C" || String(button)=="D") {  //Ak je stlacene tlacidlo "ABCD"
    per = 10;
    zobraz(String(button));
  }
  else if (String(button)=="*") { //Ak je stlacene tlacidlo "*"
    if (per!=10){per += 1;};  //Pripocitaj percenta /100
    zobraz(String(button));
  }
  else if (String(button)=="#") { //Ak je stlacene tlacidlo "#"
    if (per!=0){per -= 1;}; //Odpocitaj percenta /100
    zobraz(String(button));
  }
}