Code for a project

bigg_project.ino

#include <Arduino.h>
#include <TimeLib.h>
#include <LiquidCrystal.h>
#include <Wire.h>
#define CURRENT_TIMESTAMP 1631014463

LiquidCrystal lcd(12, 11, 5, 4, 3, 2);

byte smile[8] = { 0b00000, 0b00000, 0b01010, 0b00000, 0b10001, 0b01110, 0b00000, 0b00000 }; // :)
byte no_smile[8] = { 0b00000, 0b00000, 0b01010, 0b00000, 0b01110, 0b10001, 0b00000 ,0b00000 }; // :(

const unsigned short cups_to_drink_per_day = 6; // 1/4 L * 6 = 1.5L
short times[cups_to_drink_per_day] = {9, 11, 14, 16, 18, 20};
boolean times_drunk[cups_to_drink_per_day] = {false, false, false, false, false, false};
unsigned short cups_you_should_drink = 5;

const unsigned short green = 6;
const unsigned short red = 9;
const unsigned short buzzer = 8;
const unsigned short button = 7;

void alarm() {
    for (unsigned short i = 444; i <= 700; ++i) {
        tone(buzzer, i);
        delay(1);
    }
    for (unsigned short i = 700; i >= 444; --i) {
        tone(buzzer, i);
        delay(1);
    }
}

void panic(boolean panic = false) {
    if (panic) {
        analogWrite(green, 0);
        analogWrite(red, 255);
    } else {
        analogWrite(red, 0);
        analogWrite(green, 255);
    }
}

void setup_lcd(unsigned short col = 0, unsigned short row = 0) {
    lcd.clear();
    lcd.setCursor(col, row);
}

void log_cups_to_drink(unsigned short amount_of_cups = 0) {
    if (amount_of_cups == 0) {
        panic(false);
        setup_lcd();
        lcd.print("You drank enough");
        lcd.setCursor(7, 1);
        lcd.write(1); // Happy :)
    } else {
        panic(true);
        setup_lcd(0, 0);
        lcd.print("You should ");
        lcd.print("drink ");
        lcd.setCursor(1, 1);
        lcd.print(amount_of_cups);
        lcd.print(" more");
        lcd.print(amount_of_cups > 1 ? " cups " : " cup  ");
        lcd.write(2);
    }
    delay(300);
}

void input_buttons() {
    if (digitalRead(button) && cups_you_should_drink > 0) {
        delay(10);
        --cups_you_should_drink;
        log_cups_to_drink(cups_you_should_drink);
        delay(10);
    }
}

void setup()  {
    setTime(CURRENT_TIMESTAMP);

    Serial.begin(9600);

    lcd.begin(16, 2);
    lcd.createChar(1, smile);
    lcd.createChar(2, no_smile);

    pinMode(green, OUTPUT);
    pinMode(red, OUTPUT);
    pinMode(button, INPUT);
    pinMode(buzzer, OUTPUT);

    log_cups_to_drink(0);
}

void check_to_add_cup_to_drink() {
    for (unsigned short i = 0; i < 8; ++i) {
        if (hour() == times[i] && !(times_drunk[i])) {
            times_drunk[i] = true;
            ++cups_you_should_drink;
            log_cups_to_drink(cups_you_should_drink);
            for (unsigned short j = 0; j < 5; ++j) {
                alarm();
            }
            return;
        }
    }
}

void loop() {
}