#include <ESP8266WiFi.h>
#include <WiFiUdp.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
const char *ssid = "your ssid here";
const char *password = "password (leave it balnk for open network)";
const long utcOffsetInSeconds = 19800; //UTC offset in seconds
char days[7][12] = {"SUN", "MON", "TUE", "WED", "THU", "FRI", "SAT"};
char month[12][4] = {"Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"};
WiFiUDP ntpUDP;
NTPClient timeClient(ntpUDP, "pool.ntp.org", utcOffsetInSeconds); //create object of NTP client
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1); //create object of ssd1306 -1 no hardware rest pin
void setup()
{
Serial.begin(115200);
if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) { // Address for 128x64
Serial.println(F("SSD1306 allocation failed"));
for(;;);
}
delay(2000);
/*intialize OLED display*/
display.clearDisplay();
display.setCursor(0,0);
display.setTextSize(1);
display.setTextColor(WHITE);
display.setCursor(10,28);
display.setTextSize(2);
display.print("saMvidita");
delay(2500);
display.display();
display.clearDisplay();
display.setCursor(3,28);
display.setTextSize(2);
display.setTextColor(WHITE);
/*Connect to the WiFi*/
WiFi.begin(ssid, password);
display.print("Connecting");
while (WiFi.status() != WL_CONNECTED)
{
delay(800);
//Serial.print (".");
display.print(".");
display.display();
}
display.setCursor(0,0);
display.setTextSize(1);
display.clearDisplay();
timeClient.begin();
}
void loop()
{
timeClient.update(); //upadte time
displayTimeDate(); //display time on OLED
delay(100);
}
void displayTimeDate()
{
String meridiem;
int hour;
/*Calculate time and date*/
unsigned long epochTime = timeClient.getEpochTime();
struct tm *ptm = gmtime ((time_t *)&epochTime);
int date = ptm->tm_mday;
int monthNum = ptm->tm_mon+1;
int year = ptm->tm_year+1900;
String day = days[timeClient.getDay()];
int minute = timeClient.getMinutes();
int second = timeClient.getSeconds();
/*Convert 24hr format to 12hr format*/
if(timeClient.getHours() >= 12)
{
meridiem = "PM";
hour = timeClient.getHours() - 12;
}
else
{
meridiem = "AM";
hour = timeClient.getHours();
}
if(hour == 0)
{
hour = 12;
}
/*Display time on OLED display*/
display.clearDisplay();
display.setTextSize(2);
display.setCursor(5,10);
display.print(day);
display.setTextSize(3);
display.setCursor(58,6);
if(date < 10) display.print(0);
display.print(date);
display.setTextSize(1);
display.setCursor(97,8);
display.print(month[monthNum-1]);
display.setCursor(97,20);
display.print(year);
display.setCursor(5,39);
display.setTextSize(3);
if(hour < 10) display.print(0);
display.print(hour);
display.print(":");
if(minute < 10) display.print(0);
display.print(minute);
display.setTextSize(2);
display.setCursor(100,37);
if(second < 10) display.print(0);
display.print(second);
display.setTextSize(1);
display.setCursor(100,55);
display.print(meridiem);
display.display();
}
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