#include <LiquidCrystal.h> 
#include "Wire.h" 
#define DS1307_ADDRESS 0x68 
byte zero = 0x00; 
LiquidCrystal lcd(2, 3, 4, 5, 6, 7); 
int menu; 
byte second ,minute,hour, weekDay; 
byte monthDay,month,year; 
boolean up=false; 
boolean down=false; 

void setup() {
  // put your setup code here, to run once:
pinMode(8,INPUT); 
 pinMode(9,INPUT); 
 pinMode(10,INPUT); 
 pinMode(11,INPUT); 
 digitalWrite(8,HIGH); 
 digitalWrite(9,HIGH); 
 digitalWrite(10,HIGH); 
 digitalWrite(11,HIGH); 
 Wire.begin(); 
 lcd.begin(16, 2); 
 lcd.setCursor(0,0); 
 lcd.print("Kalender digital"); 
 delay(2000); 
 lcd.clear();
}

void loop() {
  // put your main code here, to run repeatedly:
 bacaRTC();
 lcdDisplay();
 cekTombol();
 delay(1000);
}
byte decToBcd(byte val){
 return ( (val/10*16) + (val%10) );
}
byte bcdToDec(byte val) {
 return ( (val/16*10) + (val%16) );
}
void bacaRTC(){
 Wire.beginTransmission(DS1307_ADDRESS);
 Wire.write(zero);
 Wire.endTransmission();
 Wire.requestFrom(DS1307_ADDRESS, 7);
 second = bcdToDec(Wire.read());
 minute = bcdToDec(Wire.read());
 hour = bcdToDec(Wire.read() & 0b111111);
 weekDay = bcdToDec(Wire.read());
 monthDay = bcdToDec(Wire.read());
 month = bcdToDec(Wire.read());
 year = bcdToDec(Wire.read());
}
void cekTombol(){
 if (digitalRead(8)==0){
 lcd.clear();
 lcd.print("Seting RTC");
 delay(2000);
 menu++;
 lcd.clear();
 lcdDisplay();
 lcd.blink();
 do{
 //------------------------next
 if (digitalRead(8)==0){
 delay(300);
 menu++;
 }
 //--------------------back
 else if (digitalRead(9)==0){
 delay(300);
 if (menu > 1){
 menu--;
 }
 }
 //---------------------------up
 else if(digitalRead(10)==0){
 delay(200);
 up=true;
 }
 
 //----------------------------down 
 else if(digitalRead(11)==0){
 delay(200);
 down=true;
 }
//-------------------------edit data jam 
 if (menu==1){
 if (up==true && hour < 24){
 hour++;
 lcdDisplay();
 }
 else if (down==true && hour>0){
 hour--;
 lcdDisplay();
 }
 up=false;
 down=false;
 if (hour<10){ 
 lcd.setCursor(5,0);
 }
 else { 
 lcd.setCursor(6,0);
 }
 }
 
//-------------------------edit data menit
 else if (menu==2){ 
 if (up==true && minute < 59){ 
 minute++;
 lcdDisplay();
 }
 else if (down==true && minute>0){
 minute--;
 lcdDisplay();
 }
 up=false;
 down=false;
 
 if (hour<10 && minute<10){ 
 lcd.setCursor(7,0);
 }
 else if (hour<10 && minute>9){ 
 lcd.setCursor(8,0);
 }
 else if (hour>9 && minute<10){ 
 lcd.setCursor(8,0);
 }
 else if (hour>9 && minute>9){ 
 lcd.setCursor(9,0);
 }
 }
 
//-------------------------edit data detik 
 else if (menu==3){
 if (up==true && second < 59){ 
 second++;
 lcdDisplay();
 }
 else if (down==true && second>0){
 second--;
 lcdDisplay();
 }
 up=false;
 down=false;
 
 if (hour<10 && minute<10 && second<10){ 
 lcd.setCursor(9,0);
 }
 else if (hour<10 && minute<10 && second>9){ 
 lcd.setCursor(10,0);
 }
 else if (hour<10 && minute>9 && second<10){ 
 lcd.setCursor(10,0);
 }
 else if (hour>9 && minute<10 && second<10){ 
 lcd.setCursor(10,0);
 }
 else if (hour<10 && minute>9 && second>9){ 
 lcd.setCursor(11,0); 
 } 
 else if (hour>9 && minute>9 && second<10){ 
 lcd.setCursor(11,0); 
 } 
 else if (hour>9 && minute<10 && second>9){ 
 lcd.setCursor(11,0); 
 } 
 else if (hour>9 && minute>9 && second>9){ 
 lcd.setCursor(12,0); 
 } 
 } 
 
//-------------------------edit data hari 
 else if (menu==4){ 
 if (up==true && weekDay < 6){ 
 weekDay++; 
 lcdDisplay(); 
 } 
 else if (down==true && weekDay>0){ 
 weekDay--; 
 lcdDisplay(); 
 } 
 up=false; 
 down=false; 
 lcd.setCursor(0,1); 
 } 
 
//-------------------------edit data tanggal 
 else if (menu==5){ 
 if (up==true && monthDay < 31){ 
 monthDay++; 
 lcdDisplay(); 
 } 
 else if (down==true && monthDay>1){ 
 monthDay--; 
 lcdDisplay(); 
 } 
 up=false; 
 down=false; 
 if (monthDay<10){ 
 lcd.setCursor(5,1); 
 } 
 else { 
 lcd.setCursor(6,1); 
 } 
 }
 
//-------------------------edit data bulan
 else if (menu==6){ 
 if (up==true && month < 12){ 
 month++;
 lcdDisplay();
 }
 else if (down==true && month>1){
 month--;
 lcdDisplay();
 }
 up=false;
 down=false;
 
 if (monthDay<10 && month<10){ 
 lcd.setCursor(7,1);
 }
 else if (monthDay<10 && month>9){ 
 lcd.setCursor(8,1);
 }
 else if (monthDay>9 && month<10){ 
 lcd.setCursor(8,1);
 }
 else if (monthDay>9 && month>9){ 
 lcd.setCursor(9,1);
 }
 }
 
//-------------------------edit data tahun
 else if (menu==7){
 if (up==true && year < 99){ 
 year++;
 lcdDisplay();
 }
 else if (down==true && year>0){
 year--;
 lcdDisplay();
 }
 up=false;
 down=false;
 
 if (monthDay<10 && month<10 && year<10){ 
 lcd.setCursor(11,1);
 }
 else if (monthDay<10 && month<10 && year>9){ 
 lcd.setCursor(12,1);
 }
 else if (monthDay<10 && month>9 && year<10){ 
 lcd.setCursor(12,1);
 }
 else if (monthDay>9 && month<10 && year<10){ 
 lcd.setCursor(12,1);
 }
 else if (monthDay<10 && month>9 && year>9){ 
 lcd.setCursor(13,1);
 }
 else if (monthDay>9 && month>9 && year<10){ 
 lcd.setCursor(13,1);
 }
 else if (monthDay>9 && month<10 && year>9){ 
 lcd.setCursor(13,1);
 }
 else if (monthDay>9 && month>9 && year>9){ 
 lcd.setCursor(14,1);
 }
 }
 
//-------------------------simpan data RTC 
 if (menu==8)setingRTC();
 }
 while(menu < 8);
 lcd.clear();
 lcd.noBlink();
 lcd.print("Seting RTC OK!");
 delay(1000);
 lcd.clear();
 menu=0;
 }
}
void lcdDisplay(){
 lcd.setCursor(0,0);
 lcd.print("Jam:");
 lcd.setCursor(5,0);
 lcd.print(hour);
 lcd.print(":");
 lcd.print(minute);
 lcd.print(":");
 lcd.print(second);
 lcd.print(" ");
 
 lcd.setCursor(0,1);
 hari();
 lcd.setCursor(5,1);
 lcd.print(monthDay);
 lcd.print("/");
 lcd.print(month);
 lcd.print("/20");
 lcd.print(year);
 lcd.print(" ");
} 
void hari(){
 if (weekDay==0){
 lcd.print("Ming, ");
 }
 else if (weekDay==1){
 lcd.print("Sen,");
 }
 else if (weekDay==2){
 lcd.print("Sel,");
 }
 else if (weekDay==3){
 lcd.print("Rab,");
 }
 else if (weekDay==4){
 lcd.print("Kam,");
 }
 else if (weekDay==5){
 lcd.print("Jum,");
 }
 else if (weekDay==6){
 lcd.print("Sab,");
 }
}
void setingRTC(){
 Wire.beginTransmission(DS1307_ADDRESS);
 Wire.write(zero); //stop RTC
 Wire.write(decToBcd(second));
 Wire.write(decToBcd(minute));
 Wire.write(decToBcd(hour));
 Wire.write(decToBcd(weekDay));
 Wire.write(decToBcd(monthDay));
 Wire.write(decToBcd(month));
 Wire.write(decToBcd(year));
 Wire.write(zero); //start 
 Wire.endTransmission();
}