IoT-Analog-Clock.ino

#include <SPI.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

#include <WiFi.h>
#include <time.h>

#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64

#define OLED_MOSI   23
#define OLED_CLK    18
#define OLED_DC     16
#define OLED_CS     5
#define OLED_RESET  17

Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, OLED_MOSI, OLED_CLK, OLED_DC, OLED_RESET, OLED_CS);

const char* ssid = "REPLACE_WITH_YOUR_WIFI_SSID";
const char* password = "REPACE_WITH_YOUR_WIFI_PASSWORD";
int timezone = 5.5 * 3600;
int dst = 0;

void setup()
{
Serial.begin(115200); 

  WiFi.begin(ssid, password);
  Serial.println("Connecting");
  while(WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("");
  Serial.print("Connected to WiFi network with IP Address: ");
  Serial.println(WiFi.localIP());

  if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C))
  {
    Serial.println(F("SSD1306 allocation failed"));
    for(;;);
  }
  
  display.clearDisplay();
  display.display();
  delay(1000);

  configTime(timezone, dst, "pool.ntp.org","time.nist.gov");
  while(!time(nullptr)){
  Serial.print("*");
  delay(1000);
  }
  Serial.println("\nTime response....OK"); 
}

void loop()
{
time_t now = time(nullptr);
struct tm* p_tm = localtime(&now);
Serial.println(p_tm);
int r = 30;

// Now draw the clock face
display.drawCircle(display.width()/2, display.height()/2, 2, WHITE);

//hour ticks
display.setTextSize(1);
display.setTextColor(SSD1306_WHITE);
display.setCursor(64, -2);
display.print("12");
display.setCursor(79, 2);
display.print("1");
display.setCursor(89, 13);
display.print("2");
display.setCursor(94, 28);
display.print("3");
display.setCursor(89, 43);
display.print("4");
display.setCursor(79, 53);
display.print("5");
display.setCursor(63, 58);
display.print("6");
display.setCursor(49, 53);
display.print("7");
display.setCursor(38, 42);
display.print("8");
display.setCursor(34, 28);
display.print("9");
display.setCursor(38, 13);
display.print("10");
display.setCursor(48, 2);
display.print("11");

// display second hand
float angle = p_tm->tm_sec*6 ;
angle=(angle/57.29577951) ; //Convert degrees to radians
int x3=(64+(sin(angle)*(r)));
int y3=(32-(cos(angle)*(r)));
display.drawLine(64,32,x3,y3,WHITE);
//
// display minute hand
angle = p_tm->tm_min * 6 ;
angle=(angle/57.29577951) ; //Convert degrees to radians
x3=(64+(sin(angle)*(r-3)));
y3=(32-(cos(angle)*(r-3)));
display.drawLine(64,32,x3,y3,WHITE);

// display hour hand
angle = p_tm->tm_hour * 30 + int((p_tm->tm_min / 12) * 6 );
angle=(angle/57.29577951) ; //Convert degrees to radians
x3=(64+(sin(angle)*(r-11)));
y3=(32-(cos(angle)*(r-11)));
display.drawLine(64,32,x3,y3,WHITE);
 
display.setCursor(0,0);
String monthname[12] = {"JAN", "FEB", "MAR", "APR", "MAY", "JUN", "JUL", "AUG", "SEP", "OCT", "NOV", "DEC"};
display.print(monthname[p_tm->tm_mon]);
display.print(" ");
display.print(p_tm->tm_mday); 

display.setCursor(100,0);
String dayname[7] = {"MON", "TUE", "WED", "THUR", "FRI", "SAT", "SUN"};
display.print(dayname[p_tm->tm_wday - 1]);

//update display with all data
display.display();
delay(100);
display.clearDisplay();
}