#define plus A0
#define minus A5
#include <LiquidCrystal.h>

LiquidCrystal lcd(10,9,5,4,3,2); //RS,E,D4,D5,D6,D7
bool p_pressed = true;
bool m_pressed = true;

void print_time(uint8_t time){
    Serial.print(time);
    Serial.println(":00");
}

void setup() {
  Serial.begin(9600);
  lcd.begin(16,2);
  digitalWrite(A0, HIGH);
  digitalWrite(A5, HIGH);
}

uint8_t i = 0;
uint8_t max_i = 23;
uint8_t min_i = 0;

void loop() {

  lcd.setCursor(0,0);

  if(digitalRead(plus) == LOW && p_pressed == true){
    if(i<max_i){
      i++;
    }
    lcd.print(i);
    lcd.print(":00");
    print_time(i);

    p_pressed = false;
  }
  else if(digitalRead(plus) == HIGH && p_pressed == false){
    p_pressed = true;
  }

  if(digitalRead(minus) == LOW && m_pressed == true){
    if(i>min_i){
      i--;
    }
    if(i == 9){
      lcd.clear();
      lcd.print(i);
      lcd.print(":00");
      print_time(i);

    }else{
      lcd.print(i);
      lcd.print(":00");
      print_time(i);
    }
    
    m_pressed = false;
  }
  else if(digitalRead(minus) == HIGH && m_pressed == false){
    m_pressed = true;
  }

}