Internet based analog clock using OLED display and ESP8266

 

Circuit Diagram:

Program Code:

#include <ESP8266WiFi.h>

#include <time.h>

 

#include <SPI.h>

#include <Wire.h>

#include <Adafruit_GFX.h>

#include <Adafruit_SSD1306.h>

 

#define OLED_RESET LED_BUILTIN //4

Adafruit_SSD1306 display(OLED_RESET);

 

const char* ssid = "*******";

const char* password = "**********";

 

int ledPin = 13;

 

int timezone = 5.5 * 3600;

int dst = 0;

#define SSD1306_LCDHEIGHT 64 

#if (SSD1306_LCDHEIGHT != 64)

#error("Height incorrect, please fix Adafruit_SSD1306.h!");

#endif

 

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);

int r = 35;

// Now draw the clock face

 

display.drawCircle(display.width()/2, display.height()/2, 2, WHITE);

//

//hour ticks

for( int z=0; z < 360;z= z + 30 ){

//Begin at 0° and stop at 360°

float angle = z ;

 

angle=(angle/57.29577951) ; //Convert degrees to radians

int x2=(64+(sin(angle)*r));

int y2=(32-(cos(angle)*r));

int x3=(64+(sin(angle)*(r-5)));

int y3=(32-(cos(angle)*(r-5)));

display.drawLine(x2,y2,x3,y3,WHITE);

}

// 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.setTextSize(1);

display.setCursor((display.width()/2)+10,(display.height()/2) - 3);

display.print(p_tm->tm_mday);

 

// update display with all data

display.display();

delay(100);

display.clearDisplay();

 

}