#include "LiquidCrystal.h"

// This defines the LCD wiring to the DIGITALpins
const int rs = 2, en = 3, d4 = 4, d5 = 5, d6 = 6, d7 = 7;
LiquidCrystal lcd(rs, en, d4, d5, d6, d7);

// Digital LCD Constrast setting
int pinContrast = 9;// pin 9 for contrast PWM
const int contrast = 1;// default contrast

// initial Time display is 12:59:45 PM
int varOra = 0;
int varMin = 0;
int varSec = 0;

// Time Set Buttons
int button1;
int button2;
int button3;

// Pins definition for Time Set Buttons
int pinOra = 0;// pin 0 for Hours Setting
int pinMin = 1;// pin 1 for Minutes Setting

// Backlight Time Out 
const int Time_light = 50;
int bl_TO = Time_light;// Backlight Time-Out
int pinBackLight = 10; // Backlight pin
const int backlight = 90; // no more then 7mA !!!

// For accurate Time reading, use Arduino Real Time Clock and not just delay()
static uint32_t last_time, now = 0; // RTC

int durataSunet = 1;
int pinDurataSunet = 8; // pin 8 pentru durata sunet
int pinSunet = 12;

void setup()
{
  lcd.begin(16,2);
  pinMode(pinOra, INPUT_PULLUP);// avoid external Pullup resistors for Button 1
  pinMode(pinMin, INPUT_PULLUP);// and Button 2
  analogWrite(pinContrast, contrast);// Adjust Contrast VO
  analogWrite(pinBackLight, backlight);// Turn on Backlight
  now = millis(); // read RTC initial value

  pinMode(pinDurataSunet, INPUT_PULLUP);
  pinMode(pinSunet, OUTPUT);
}

void loop()
{ 
  lcd.begin(16,2);// every second
  // Update LCD Display
  // Print TIME in Hour, Min, Sec + AM/PM
  lcd.setCursor(0,0);
  if(varOra < 10)
    lcd.print("0");// always 2 digits
  lcd.print(varOra);
  lcd.print(":");
  if(varMin < 10)
    lcd.print("0");
  lcd.print(varMin);
  lcd.print(":");
  if(varSec < 10)
    lcd.print("0");
  lcd.print(varSec);
  lcd.setCursor(0,1);// for Line 2
  lcd.print("Durata: ");
  lcd.print(durataSunet);
  lcd.print(" min ");

// make 5 time 200ms loop, for faster Button response
  for (int i = 0; i < 5; i++) {
     //delay200ms
    while ((now - last_time) < 200) { 
      now = millis();
    }
 
    // inner 200ms loop
    last_time = now; // prepare for next loop 

    // read Setting Buttons
    button1 = digitalRead(pinOra);// Read Buttons
    button2 = digitalRead(pinMin);
    button3 = digitalRead(pinDurataSunet);

    // Backlight time out 
    bl_TO--;
    if(bl_TO == 0) {
      analogWrite(pinBackLight, 0);// Backlight OFF
      bl_TO++;
    }
 
    // Hit any to activate Backlight 
    if(((button1 == 0)|(button2 == 0)|(button3 == 0)) && (bl_TO==1)) {
      bl_TO = Time_light;
      analogWrite(pinBackLight, backlight);

      // wait until Button released
      while ((button1 == 0)|(button2 == 0)|(button3 == 0)) {
          //Read Buttons
          button1 = digitalRead(pinOra);
          button2 = digitalRead(pinMin);
          button3 = digitalRead(pinDurataSunet);
      }
    } else {
      // Process Button 1, Button 2, Button 3 or Button 4 when hit while Backlight on 
      if(button1 == 0){
        varOra = varOra + 1;
        bl_TO = Time_light;
        analogWrite(pinBackLight, backlight);
      }

      if(button2 == 0){
        varSec = 0;
        varMin = varMin + 1;
        bl_TO = Time_light;
        analogWrite(pinBackLight, backlight);
      }

      if(button3 == 0) {
        durataSunet += 1;;
        bl_TO = Time_light;
        analogWrite(pinBackLight, backlight);
      }

      // manage durata sunet si delay sunet overflow
      if(durataSunet > 10)
        durataSunet = 1;

      // ---- manage seconds, minutes, hours am/pm overflow ----
      if(varSec == 60) {
        varSec = 0;
        varMin = varMin + 1;
      }

      if(varMin == 60) {
        varMin = 0;
        varOra = varOra + 1;
      }

      if(varOra == 24)
        varOra = 0;

      // Update display if time set button pressed
      if((button1 == 0)|(button2 == 0)) {
        lcd.begin(16,2);// every second
        // Update LCD Display
        // Print TIME in Hour, Min, Sec + AM/PM
        lcd.setCursor(0,0);
        if(varOra < 10)
          lcd.print("0");// always 2 digits
        lcd.print(varOra);
        lcd.print(":");
        if(varMin < 10)
          lcd.print("0");
        lcd.print(varMin);
        lcd.print(":");
        if(varSec < 10)
          lcd.print("0");
        lcd.print(varSec);
        lcd.setCursor(0,1);// for Line 2
        lcd.print("Durata: ");
        lcd.print(durataSunet);
        lcd.print(" min ");
      }
    }
  }

  // outer 1000ms loop
  varSec = varSec + 1; //increment varSec. counting
    
    
// manage seconds, minutes
  if(varSec == 60){
    varSec = 0;
    varMin = varMin + 1;
  }
  if(varMin == 60) {
    varMin = 0;
    varOra = varOra + 1;
  }
  if(varOra == 24)
    varOra = 0;
  if(durataSunet > 10) {
    durataSunet = 1;
  }

  // Programare sunet
  if((varOra >= 6) && (varOra <= 20)) {
    if(((varMin >= 0) && (varMin < durataSunet)) || ((varMin >= 30) && (varMin < 30 + durataSunet))) 
      digitalWrite(pinSunet, HIGH);
    else 
      digitalWrite(pinSunet, LOW);
  }
}