// LCD1602 to Arduino Uno connection example

#include <LiquidCrystal.h>

LiquidCrystal lcd(12, 11, 10, 9, 8, 7);

int led1 = 1;
int led2 = 2;
int led3 = 3;
int led4 = 4;



int btnUp = 5;
int buttonStateUp;
int lastButtonStateUp = LOW;
unsigned long lastDebounceTime = 0;
unsigned long debounceDelay = 50;
int readingUp;

int btnDown = 6;
int buttonStateDown;
int lastButtonStateDown = HIGH;
unsigned long lastDebounceTime1 = 0;
unsigned long debounceDelay1 = 50;
int readingDown;

int led1State = 0; 
int led1Current; 

int led2State = 0;
int led2Current;

int led3State = 0;
int led3Current;

int led4State = 0;
int led4Current;

int men = 1;







void setup() {
for(int x = 1; x <= 4; x++){
  pinMode(x, OUTPUT);
}
  pinMode(btnUp, INPUT);
  pinMode(btnDown, INPUT);
  lcd.begin(16, 2);
}

void loop() {
  bttns();
  menu();
   treshold_btn();
}


// THIS IS THE MENU FUNCTION //
void menu () {

switch(men){

case 1:
  lcd.setCursor(0,0);
  lcd.print(">LED1");
 lcd.setCursor(0,1);
  lcd.print(" LED2");
  lcd.setCursor(8,0);
  lcd.print(" LED3");
  lcd.setCursor(8,1);
  lcd.print(" LED4");


 
break;


case 2:
  lcd.setCursor(0,0);
  lcd.print(" LED1");
 lcd.setCursor(0,1);
  lcd.print(">LED2");
  lcd.setCursor(8,0);
  lcd.print(" LED3");
  lcd.setCursor(8,1);
  lcd.print(" LED4");

break;


case 3:
  lcd.setCursor(0,0);
  lcd.print(" LED1");
 lcd.setCursor(0,1);
  lcd.print(" LED2");
  lcd.setCursor(8,0);
  lcd.print(">LED3");
  lcd.setCursor(8,1);
  lcd.print(" LED4");

break;


case 4:
  lcd.setCursor(0,0);
  lcd.print(" LED1");
 lcd.setCursor(0,1);
  lcd.print(" LED2");
  lcd.setCursor(8,0);
  lcd.print(" LED3");
  lcd.setCursor(8,1);
  lcd.print(">LED4");

break;


default:
break;



}

}


// THIS IS THE BUTTONS FUNCTION //
void bttns(){
//////////////////up///////////////////////
readingUp = digitalRead(btnUp);
 if (readingUp != lastButtonStateUp) {
    lastDebounceTime = millis();
  }

  if ((millis() - lastDebounceTime) > debounceDelay) {
    if (readingUp != buttonStateUp) {
      buttonStateUp = readingUp;
      if (buttonStateUp == HIGH) {

     men++;

       
      }
    }
    lastButtonStateUp = readingUp;
  }

  lastButtonStateUp = readingUp;

///////////////////////ok////////////////////////
readingDown = digitalRead(btnDown);

  if (readingDown != lastButtonStateDown) {
    lastDebounceTime1 = millis();
  }

  if ((millis() - lastDebounceTime1) > debounceDelay1) {
    if (readingDown != buttonStateDown) {
      buttonStateDown = readingDown;
      if (buttonStateDown == HIGH) {

        if (men == 1 and led1State == 0){ //switch case 
        led1State = 1 ; // 1
        led1Current = led1State;
            digitalWrite(led1, led1Current);
           
        }else if (men == 1 and led1State == 1){ //switch case 
        led1State = 0 ; // 0
         led1Current = led1State;
            digitalWrite(led1, led1Current);
              
        }else if (men == 2 and led2State == 0){ //switch case 
        led2State = 1 ; // 1
        led2Current = led2State;
            digitalWrite(led2, led2Current);
           
        }else if (men == 2 and led2State == 1){ //switch case 
        led2State = 0 ; // 0
         led2Current = led2State;
            digitalWrite(led2, led2Current);
              
        }else if (men == 3 and led3State == 0){ //switch case 
        led3State = 1 ; // 1
        led3Current = led3State;
            digitalWrite(led3, led3Current);
           
        }else if (men == 3 and led3State == 1){ //switch case 
        led3State = 0 ; // 0
         led3Current = led3State;
            digitalWrite(led3, led3Current);
              
        }else if (men == 4 and led4State == 0){ //switch case 
        led4State = 1 ; // 1
        led4Current = led4State;
            digitalWrite(led4, led4Current);
           
        }else if (men == 4 and led4State == 1){ //switch case 
        led4State = 0 ; // 0
         led4Current = led4State;
            digitalWrite(led4, led4Current);
              
        }

      
      

        
      }
    }
    lastButtonStateDown = readingDown;
  }

  lastButtonStateDown = readingDown;
}




void treshold_btn() {

  if (men == 0) {
    men = 1;

  }

  if (men == 5) {
    men = 1;

  }

}