seven_segment_clock_with_ESP32_and_NTP.ino

//include necessary library
#include <WiFi.h>         // WiFi library for network
#include <TimeLib.h>      // Time library for time
#include <NtpClientLib.h> // NTP Client library fot network time

//define pin in/out
#define b 0   //b segment
#define a 2   //a segment
#define f 4   //f segment
#define g 5   //g segment
#define c 12  //c segment
#define d 13  //d segment
#define e 14  //e segment
#define d1 15 //1st digit
#define d2 16 //2nd digit
#define d3 17 //3rd digit
#define d4 18 //4th digit

//declaring variables and constants
const char* ssid     = "Your_WiFi_SSID";       // wifi SSD
const char* password = "WiFi_Password";        // wifi password

String NTPServer = "NTP_Server";               // NTP server address
int8_t minutesTimeZone = 0;
int8_t timeZone = 1;                           // timezone in central europe (hour)

String hour1, hour2, minute1, minute2, timer, number;
byte digit = 1;                                //digit (display counter)

void setup() {

  Serial.begin(115200);                        //initilaising serial port for debug

  WiFi.begin(ssid, password);                  //initialize WiFi

  Serial.print("Connecting to Wifi:");         //show connecting status on debug port

  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }

  Serial.print("Connected!!!");

  NTP.begin (NTPServer, timeZone, true, minutesTimeZone);   // initialize NTP
  NTP.setInterval (1200);                                   // sync interval

//set pin to output
  pinMode(a, OUTPUT);
  pinMode(b, OUTPUT);
  pinMode(c, OUTPUT);
  pinMode(d, OUTPUT);
  pinMode(e, OUTPUT);
  pinMode(f, OUTPUT);
  pinMode(g, OUTPUT);
  pinMode(d1, OUTPUT);
  pinMode(d2, OUTPUT);
  pinMode(d3, OUTPUT);
  pinMode(d4, OUTPUT);
}

void loop ()                                                    //entering to loop
{

  timer = NTP.getTimeDateString ();     //get current time
  hour1 = (timer.substring(0,1));       //parsing from data hour 1st digit
  hour2 = (timer.substring(1,2));       //parsing from data hour 2nd digit
  minute1 = (timer.substring(3,4));     //parsing from data minute 1st digit
  minute2 = (timer.substring(4,5));     //parsing from data minute 2nd digit


  if (digit == 1)                                           //if digit(display) is 1, then set 1st digit active other inactive
  {
  digitalWrite(d1,HIGH);
  digitalWrite(d2,LOW);
  digitalWrite(d3,LOW);
  digitalWrite(d4,LOW);
  number = hour1;
  displaydigit();                                           //call seven segment driver
  }

    if (digit == 2)                                         //if digit(display) is 2, then set 2nd digit active other inactive
  {
  digitalWrite(d1,LOW);
  digitalWrite(d2,HIGH);
  digitalWrite(d3,LOW);
  digitalWrite(d4,LOW);
  number = hour2;
  displaydigit();                                           //call seven segment driver
  }

    if (digit == 3)                                         //if digit(display) is 3, then set 3rd digit active other inactive
  {
  digitalWrite(d1,LOW);
  digitalWrite(d2,LOW);
  digitalWrite(d3,HIGH);
  digitalWrite(d4,LOW);
  number = minute1;
  displaydigit();                                           //call seven segment driver
  }

    if (digit == 4)                                         //if digit(display) is 4, then set 4nd digit active other inactive
  {
  digitalWrite(d1,LOW);
  digitalWrite(d2,LOW);
  digitalWrite(d3,LOW);
  digitalWrite(d4,HIGH);
  number = minute2;
  displaydigit();                                           //call seven segment driver
  digit=0;                                                  //reset digit(display) counter
  }

  digit = digit+1;                                          //increasing digit(display)counter
}

void displaydigit()                                         //seven segment driver
{
  if (number == "0" & digit == 1 )                          //no displaying 0(zero) if first digit is 0 (expample: morning 08:42)
  {
    digitalWrite(a,LOW);
    digitalWrite(b,LOW);
    digitalWrite(c,LOW);
    digitalWrite(d,LOW);
    digitalWrite(e,LOW);
    digitalWrite(f,LOW);
    digitalWrite(g,LOW);
    }

    if (number == "0" & digit > 1 )                         //else display 0(zero)
    {
    digitalWrite(a,HIGH);
    digitalWrite(b,HIGH);
    digitalWrite(c,HIGH);
    digitalWrite(d,HIGH);
    digitalWrite(e,HIGH);
    digitalWrite(f,HIGH);
    digitalWrite(g,LOW);
    }
      if (number == "1")
  {
    digitalWrite(a,LOW);
    digitalWrite(b,HIGH);
    digitalWrite(c,HIGH);
    digitalWrite(d,LOW);
    digitalWrite(e,LOW);
    digitalWrite(f,LOW);
    digitalWrite(g,LOW);
    }
      if (number == "2")
  {
    digitalWrite(a,HIGH);
    digitalWrite(b,HIGH);
    digitalWrite(c,LOW);
    digitalWrite(d,HIGH);
    digitalWrite(e,HIGH);
    digitalWrite(f,LOW);
    digitalWrite(g,HIGH);
    }
      if (number == "3")
  {
    digitalWrite(a,HIGH);
    digitalWrite(b,HIGH);
    digitalWrite(c,HIGH);
    digitalWrite(d,HIGH);
    digitalWrite(e,LOW);
    digitalWrite(f,LOW);
    digitalWrite(g,HIGH);
    }
      if (number == "4")
  {
    digitalWrite(a,LOW);
    digitalWrite(b,HIGH);
    digitalWrite(c,HIGH);
    digitalWrite(d,LOW);
    digitalWrite(e,LOW);
    digitalWrite(f,HIGH);
    digitalWrite(g,HIGH);
    }
  if (number == "5")
  {
    digitalWrite(a,HIGH);
    digitalWrite(b,LOW);
    digitalWrite(c,HIGH);
    digitalWrite(d,HIGH);
    digitalWrite(e,LOW);
    digitalWrite(f,HIGH);
    digitalWrite(g,HIGH);
    }
      if (number == "6")
  {
    digitalWrite(a,HIGH);
    digitalWrite(b,LOW);
    digitalWrite(c,HIGH);
    digitalWrite(d,HIGH);
    digitalWrite(e,HIGH);
    digitalWrite(f,HIGH);
    digitalWrite(g,HIGH);
    }
      if (number == "7")
  {
    digitalWrite(a,HIGH);
    digitalWrite(b,HIGH);
    digitalWrite(c,HIGH);
    digitalWrite(d,LOW);
    digitalWrite(e,LOW);
    digitalWrite(f,LOW);
    digitalWrite(g,LOW);
    }
      if (number == "8")
  {
    digitalWrite(a,HIGH);
    digitalWrite(b,HIGH);
    digitalWrite(c,HIGH);
    digitalWrite(d,HIGH);
    digitalWrite(e,HIGH);
    digitalWrite(f,HIGH);
    digitalWrite(g,HIGH);
    }
      if (number == "9")
  {
    digitalWrite(a,HIGH);
    digitalWrite(b,HIGH);
    digitalWrite(c,HIGH);
    digitalWrite(d,HIGH);
    digitalWrite(e,LOW);
    digitalWrite(f,HIGH);
    digitalWrite(g,HIGH);
    }
}