/*
Youtube.com/LeimanGoVlog
Tokopedia.com/tridipiproject
saweria.co/leimangovlog
instagram/tridipi.project
github.com/leiman07
leimanilmu.blogspot.com
*/

//Cara membuat jam digital NTP IOT

#include <ESP8266WiFi.h>
#include <time.h>
#include <SPI.h>
#include <Wire.h>

#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#define SCREEN_WIDTH 128 		// OLED display width, in pixels
#define SCREEN_HEIGHT 64 		// OLED display height, in pixels
#define OLED_RESET -1
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

const char* ssid = "nama_wifi_anda";
const char* password = "password_wifi_anda";

int ledPin = D5;

int timezone = 7 * 3600;
int dst = 0;

void setup() {

  display.begin(SSD1306_SWITCHCAPVCC, 0x3C);

  // Clear the buffer.
  display.clearDisplay();
  display.display();
  
  pinMode(ledPin,OUTPUT);
  digitalWrite(ledPin,LOW);

  Serial.begin(115200);

  display.setTextSize(1);
  display.setTextColor(WHITE);
  
  display.setCursor(0,0);
  display.println("Wifi connecting to ");
  display.println( ssid );

  WiFi.begin(ssid,password);
 
  display.println("\nConnecting");

  display.display();

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

  // Clear the buffer.
  display.clearDisplay();
  display.display();
  display.setCursor(0,0);
  
  display.println("Wifi Connected!");
  display.print("IP:");
  display.println(WiFi.localIP() );

  display.display();

  configTime(timezone, dst, "pool.ntp.org","time.nist.gov");
  display.println("\nWaiting for NTP...");

  while(!time(nullptr)){
     Serial.print("*");
     
     delay(1000);
  }
  display.println("\nTime response....OK"); 
  display.display();  
  delay(1000);

  display.clearDisplay();
  display.display();
}

void loop() {
  
  time_t now = time(nullptr);
  struct tm* p_tm = localtime(&now);
  
  Serial.print(p_tm->tm_mday);
  Serial.print("/");
  Serial.print(p_tm->tm_mon + 1);
  Serial.print("/");
  Serial.print(p_tm->tm_year + 1900);
  
  Serial.print(" ");
  
  Serial.print(p_tm->tm_hour);
  Serial.print(":");
  Serial.print(p_tm->tm_min);
  Serial.print(":");
  Serial.println(p_tm->tm_sec);
  
  // Clear the buffer.
  display.clearDisplay();
 
  display.setTextSize(3);
  display.setTextColor(WHITE);
  
  display.setCursor(0,16);
  display.print(p_tm->tm_hour);
  display.print(":");
  if( p_tm->tm_min <10)
    display.print("0"); 
  display.print(p_tm->tm_min);
  
  display.setTextSize(2);
  display.setCursor(90,23);
  display.print(".");
  if( p_tm->tm_sec <10)
    display.print("0"); 
  display.print(p_tm->tm_sec);

  display.setTextSize(2);
  display.setCursor(5,0);
  display.print(p_tm->tm_mday);
  display.print("/");
  display.print(p_tm->tm_mon + 1);
  display.print("/");
  display.print(p_tm->tm_year + 1900);

  display.setTextSize(1);
  display.setCursor(25,44);
  display.print("Tridipi.project");
  
  display.setTextSize(1);
  display.setCursor(2,55);
  display.print("-----------------------------------");
  display.display();

  delay(1000); // update every 1 sec
}

//PROJECT : Cara membuat jam digital NTP IOT
//DIBUAT  : TRIDIPI.PROJECT
//TANGGAL : 07/12/2021