Arduino clock project whit 0.96 inch OLED display

One of the coolest things you can do with an Arduino is building an OLED clock. It's really easy to do and the results are really cool. First, you'll need an Arduino and an OLED display. The Arduino doesn't need to be very powerful, but it does need to have some USB capabilities. You can find OLED displays at many electronics stores. Next, you'll need to download the Arduino library for OLED displays. The library is free and can be found on the Arduino website. Once you have the library installed, you can use it to create your clock. To create your clock, first, start by creating a new sketch. The sketch will contain the code that controls the display. Once the sketch is created, you'll need to add the library to the Arduino. To do this, open the Arduino software and click on the Sketch tab. Then, click on the Include Library button and select the OLED Library file that you downloaded earlier.

Making Video:

Circuit Diagram :

connect the all the components as shown in the below circuit 

code:

 #include <SPI.h>

  #include <Wire.h>

  #include "RTClib.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

// Declaration for an SSD1306 display connected to I2C (SDA, SCL pins)

#define OLED_RESET     4 // Reset pin # (or -1 if sharing Arduino reset pin)

Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

// Setup RTC

  RTC_DS1307 RTC;

  char monthString[37]= {"JanFebMarAprMayJunJulAugSepOctNovDec"};

  int  monthIndex[122] ={0,3,6,9,12,15,18,21,24,27,30,33};

void setup() {

  Serial.begin(9600);

  // If you want to set the aref to something other than 5v

  analogReference(EXTERNAL);

  Wire.begin();

  RTC.begin();

  if (! RTC.isrunning()) {

    Serial.println("RTC is NOT running!");

    // following line sets the RTC to the date & time this sketch was compiled

    RTC.adjust(DateTime(__DATE__, __TIME__));

  }

  // by default, we'll generate the high voltage from the 3.3v line internally! (neat!)

  // Use I2C Scanner to check the address, if necessary change the 0x3C in the line below

  display.begin(SSD1306_SWITCHCAPVCC, 0x3C);  // initialize with the I2C addr 0x3C (for the 128x64)

  // init done

  // set font size

  display.setTextSize(1);  // small font size

  display.setTextColor(WHITE);

  display.clearDisplay();

  

}

void loop() {

 //***** RTC **********

  DateTime now = RTC.now();

  display.setCursor(32,57);  

  display.print(now.day(), DEC);

  display.print('/');

  for (int i=0; i<=2; i++){

    display.print(monthString[monthIndex[now.month()-1]+i]);

  }

  display.print('/');

  display.print(now.year(), DEC);   

 // ********************* 

  //

  // display time in digital format

  display.setCursor(10,2); 

  display.print(now.hour(), DEC);

  printDigits(now.minute());

  printDigits(now.second());

  //

  // Now draw the clock face

  display.drawCircle(display.width()/2, display.height()/2, 20, WHITE);

  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)*20));

    int y2=(32-(cos(angle)*20));

    int x3=(64+(sin(angle)*(20-5)));

    int y3=(32-(cos(angle)*(20-5)));

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

  }

  // display second hand

  float angle = now.second()*6 ;

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

  int x3=(64+(sin(angle)*(20)));

  int y3=(32-(cos(angle)*(20)));

  display.drawLine(64,32,x3,y3,WHITE);

  //

  // display minute hand

  angle = now.minute() * 6 ;

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

  x3=(64+(sin(angle)*(20-3)));

  y3=(32-(cos(angle)*(20-3)));

  display.drawLine(64,32,x3,y3,WHITE);

  //

  // display hour hand

  angle = now.hour() * 30 + int((now.minute() / 12) * 6 )   ;

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

  x3=(64+(sin(angle)*(20-11)));

  y3=(32-(cos(angle)*(20-11)));

  display.drawLine(64,32,x3,y3,WHITE);

}

// **************** End Main Loop *****************

void printDigits(int digits){

  // utility function for digital clock display: prints preceding colon and leading 0

  display.print(":");

  if(digits < 10)

    display.print('0');

    display.print(digits);

  }