#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27,20,4);

#define BUTTON1 2
#define BUTTON2 3
#define BUTTON3 4
#define LED1 5
#define LED2 6
#define LED3 7

bool ledState1 = LOW;
bool ledState2 = LOW;
bool ledState3 = LOW;

//button1
int buttonState1 = LOW;
int lastButtonState1 = LOW;
long lastDebounceTime1 = 0;
long debounceDelay = 50;

//button2
int buttonState2 = LOW;
int lastButtonState2 = LOW;
long lastDebounceTime2 = 0;

//button3
int buttonState3 = LOW;
int lastButtonState3 = LOW;
long lastDebounceTime3 = 0;

void setup() {
  lcd.init();
  lcd.backlight();
  pinMode(BUTTON1, INPUT);
  pinMode(BUTTON2, INPUT);
  pinMode(BUTTON3, INPUT);
  pinMode(LED1, OUTPUT);
  pinMode(LED2, OUTPUT);  
  pinMode(LED3, OUTPUT);
  Serial.begin(9600);
  lcd.setCursor(0,0);
  lcd.print("kontrola stavu TL:");
}

void loop() {
  //LED1
  int reading1 = digitalRead(BUTTON1);
  if (reading1 != lastButtonState1) {
    lastDebounceTime1 = millis();
  }
  if ((millis() - lastDebounceTime1) > debounceDelay) {
    if (reading1 != buttonState1) {
      buttonState1 = reading1;
      if (buttonState1 == HIGH) {
        ledState1 = !ledState1;
        digitalWrite(LED1, ledState1);
        zobraz();
      }
    }
  }
  lastButtonState1 = reading1;

  //LED2
  int reading2 = digitalRead(BUTTON2);
  if (reading2 != lastButtonState2) {
    lastDebounceTime2 = millis();
  }
  if ((millis() - lastDebounceTime2) > debounceDelay) {
    if (reading2 != buttonState2) {
      buttonState2 = reading2;
      if (buttonState2 == HIGH) {
        ledState2 = !ledState2;
        digitalWrite(LED2, ledState2);
        zobraz();
      }
    }
  }
  lastButtonState2 = reading2;

  //LED3
  int reading3 = digitalRead(BUTTON3);
  if (reading3 != lastButtonState3) {
    lastDebounceTime3 = millis();
  }
  if ((millis() - lastDebounceTime3) > debounceDelay) {
    if (reading3 != buttonState3) {
      buttonState3 = reading3;
      if (buttonState3 == HIGH) {
        ledState3 = !ledState3;
        digitalWrite(LED3, ledState3);
        zobraz();
      }
    }
  }
  lastButtonState3 = reading3;
}

void zobraz() {
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("kontrola stavu TL:");

  lcd.setCursor(0, 1);
  if (ledState1) {
    lcd.print("TL1 - stlacene");
  }
  lcd.setCursor(0, 2);
  if (ledState2) {
    lcd.print("TL2 - stlacene");
  }
  lcd.setCursor(0, 3);
  if (ledState3) {
    lcd.print("TL3 - stlacene");
  }
}