Hello guys!
I´ve been grinding on this project for the last few days, and as always, my projects consists of cut&paste from things I need.
So you can view this code as a "bastard" code 
The code is running perfectly with the computer plugged into the arduino and as long as the serial monitor i opened/up.
If I recycle power to the arduino the code refuses to print anything to the LCD if the serial monitor is not opened.
As soon as I open the Serial Monitor, the LCD shows the desired data, and I can close down the serial monitor and even disconnect the computer entirely, and the code still works.
As per now, I need to open up the serial monitor Each time I recycle the power on the arduino.
This is very frustrating for me, so please help.
See code for troubleshooting.
Thanks in advance
/*
Doorbell immobilizer dependent on clock-time
*/
/////////////PIN CONFIG ARDUINO MICRO////////////////
//RTC Pin MICRO PIN
// SCL <--> 3
// SDA <--> 2
/////////////PIN CONFIG ARDUINO UNO////////////////
//RTC Pin UNO PIN
// SCL <--> A5
// SDA <--> A4
//DS1307 from Adafruit has I2C address 0x68
//====================================================================================//
// include the library code:
// Date and time functions using a DS1307 RTC connected via I2C and Wire lib
#include <Wire.h>
#include "RTClib.h"
#include <LiquidCrystal.h>
// initialize the library with the numbers of the interface pins
LiquidCrystal lcd(12, 11, 5, 4, 9, 8);
RTC_DS1307 rtc;
char daysOfTheWeek[7][12] = {"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"};
const int ledPin = 13; // pin that the LED is attached to
int Relay_out = 7; //define pin 7 as Relay_out static
//int RelayStateOpen = 5; //too be used if LED is the indication
//int RelayStateClosed = 6; //too be used if LED is the indication
//====================================================================================//
// the setup function runs once when you press reset or power the board
void setup() {
// RELAY output/////////////////////////////////
// initialize digital pin Relay_out as an output.
pinMode(Relay_out, OUTPUT);
// LED OUT FROM STATE//////////////////////////
// initialize the LED pin as an output:
pinMode(ledPin, OUTPUT);
//pinMode(RelayStateOpen, OUTPUT);
//pinMode(RelayStateClosed, OUTPUT);
// initialize serial///////////////////////////
// Serial is neccessary for RTC Monitoring
while (!Serial); // for Leonardo/Micro/Zero
Serial.begin(57600);
if (! rtc.begin()) {
//Serial.println("Couldn't find RTC");
while (1);
}
if (! rtc.isrunning()) {
//Serial.println("RTC is NOT running!");
// following line sets the RTC to the date & time this sketch was compiled
// rtc.adjust(DateTime(F(__DATE__), F(__TIME__))); //remove comment for activating
// This line sets the RTC with an explicit date & time, for example to set
// January 21, 2014 at 3am you would call:
//rtc.adjust(DateTime(2017,04,06,22,44,00)); // rtc.adjust(DateTime(yyyy,mm,dd,hh,mm,ss));remove comment for activating
}
// set up the LCD's number of columns and rows:
lcd.begin(16, 2);
}
//====================================================================================//
// the loop function runs over and over again forever
void loop() {
// READ RTC TIME
DateTime now = rtc.now();
//USE RTC TIME TO DO LOGIC OPERATION
if (now.hour() >= 17) {
digitalWrite(Relay_out, HIGH);
digitalWrite(ledPin, HIGH);
digitalWrite(RelayStateOpen, HIGH);
digitalWrite(RelayStateClosed, LOW);
//print string, status and time to LCD if condition is met
lcd.clear(); //Flash LCD screen
lcd.setCursor(0, 0); //set cursor to top line
lcd.print("Doorbell Status:"); //write to lcd
lcd.setCursor(0, 1); //set cursor to bottom line
lcd.print ("ISOLATE"); //write to lcd
lcd.setCursor(8, 1); //set cursor to bottom line at column 8
lcd.print(now.hour(), DEC); //write hours to lcd
lcd.print(':'); //write : to lcd
lcd.print(now.minute(), DEC); //write minutes to lcd
lcd.print(':'); //write : to lcd
lcd.print(now.second(), DEC); //write seconds to lcd
}
else {
digitalWrite(Relay_out, LOW);
digitalWrite(ledPin, LOW);
digitalWrite(RelayStateOpen, LOW);
digitalWrite(RelayStateClosed, HIGH);
//print string, status and time to LCD if condition is NOT met
lcd.clear(); //Flash LCD
lcd.setCursor(0, 0); //set cursor to top line
lcd.print("Doorbell Status:"); //write to lcd
lcd.setCursor(0, 1); //set cursor to bottom line
lcd.print ("NORMAL"); //write to lcd
lcd.setCursor(8, 1); //set cursor to bottom line
lcd.print(now.hour(), DEC); //write hours to lcd
lcd.print(':'); //write : to lcd
lcd.print(now.minute(), DEC); //write minutes to lcd
lcd.print(':'); //write : to lcd
lcd.print(now.second(), DEC); //write seconds to lcd
}
// write RTC time to serial for debugging purposes
Serial.print(now.year(), DEC);
Serial.print('/');
Serial.print(now.month(), DEC);
Serial.print('/');
Serial.print(now.day(), DEC);
Serial.print(" (");
Serial.print(daysOfTheWeek[now.dayOfTheWeek()]);
Serial.print(") ");
Serial.print(" ");
Serial.print(now.hour(), DEC);
Serial.print(':');
Serial.print(now.minute(), DEC);
Serial.print(':');
Serial.print(now.second(), DEC);
Serial.println();
delay(1000);
}