#include "oled.h"
#include "soft_i2c.h"
#include "MyTimer.h"
//------------------------------ Definitions ---------------------------------//

#define SSD1306_SETCONTRAST          0x81
#define SSD1306_DISPLAYALLON_RESUME  0xA4
#define SSD1306_DISPLAYALLON         0xA5
#define SSD1306_NORMALDISPLAY        0xA6
#define SSD1306_INVERTDISPLAY_       0xA7
#define SSD1306_DISPLAYOFF           0xAE
#define SSD1306_DISPLAYON            0xAF
#define SSD1306_SETDISPLAYOFFSET     0xD3
#define SSD1306_SETCOMPINS           0xDA
#define SSD1306_SETVCOMDETECT        0xDB
#define SSD1306_SETDISPLAYCLOCKDIV   0xD5
#define SSD1306_SETPRECHARGE         0xD9
#define SSD1306_SETMULTIPLEX         0xA8
#define SSD1306_SETLOWCOLUMN         0x00
#define SSD1306_SETHIGHCOLUMN        0x10
#define SSD1306_SETSTARTLINE         0x40
#define SSD1306_MEMORYMODE           0x20
#define SSD1306_COLUMNADDR           0x21
#define SSD1306_PAGEADDR             0x22
#define SSD1306_COMSCANINC           0xC0
#define SSD1306_COMSCANDEC           0xC8
#define SSD1306_SEGREMAP             0xA0
#define SSD1306_CHARGEPUMP           0x8D
#define SSD1306_EXTERNALVCC          0x01
#define SSD1306_SWITCHCAPVCC         0x02

// Scrolling #defines
#define SSD1306_ACTIVATE_SCROLL                      0x2F
#define SSD1306_DEACTIVATE_SCROLL                    0x2E
#define SSD1306_SET_VERTICAL_SCROLL_AREA             0xA3
#define SSD1306_RIGHT_HORIZONTAL_SCROLL              0x26
#define SSD1306_LEFT_HORIZONTAL_SCROLL               0x27
#define SSD1306_VERTICAL_AND_RIGHT_HORIZONTAL_SCROLL 0x29
#define SSD1306_VERTICAL_AND_LEFT_HORIZONTAL_SCROLL  0x2A



MyTimer timer;
int i=0;
void setup() {
  I2C_initiate();
  OLED_Init();
  OLED_Init_2();

  timer.setCallback([](){
    i++;if(i>99)i=0;
    timer.reset();
    });
  timer.setTimeout(500);
}

void loop() {
 oled_put_str(0, 0, "Entammede jimikki kammal song.mp3");
     OLED_number(i);
    //OLED_Display_CLear_Number();
 timer.run();
}


sketch.ino

diagram.json

# Wokwi Library List
# See https://docs.wokwi.com/guides/libraries

Adafruit SSD1306
HttpClient
ArduinoJson
WiFi

libraries.txt

#define SSID "Wokwi-GUEST"
#define WIFI_PASSWORD ""

secrets.h

font.h

oled.cpp

#ifndef oled_h
#define oled_h
#include <Arduino.h>
/******************************************************************************
                      SSD1306 ID and Command List
******************************************************************************/
#define SSD1306_ADDRESS		0x3C

#define SSD1306_COMMAND			0x00
#define SSD1306_DATA			0xC0
#define SSD1306_DATA_CONTINUE	0x40

#define SSD1306_SET_CONTRAST_CONTROL					0x81
#define SSD1306_DISPLAY_ALL_ON_RESUME					0xA4
#define SSD1306_DISPLAY_ALL_ON							0xA5
#define SSD1306_NORMAL_DISPLAY							0xA6
#define SSD1306_INVERT_DISPLAY							0xA7
#define SSD1306_DISPLAY_OFF								0xAE
#define SSD1306_DISPLAY_ON								0xAF
#define SSD1306_NOP										0xE3

#define SSD1306_HORIZONTAL_SCROLL_RIGHT					0x26
#define SSD1306_HORIZONTAL_SCROLL_LEFT					0x27
#define SSD1306_HORIZONTAL_SCROLL_VERTICAL_AND_RIGHT	0x29
#define SSD1306_HORIZONTAL_SCROLL_VERTICAL_AND_LEFT		0x2A
#define SSD1306_DEACTIVATE_SCROLL						0x2E
#define SSD1306_ACTIVATE_SCROLL							0x2F
#define SSD1306_SET_VERTICAL_SCROLL_AREA				0xA3

#define SSD1306_SET_LOWER_COLUMN						0x00
#define SSD1306_SET_HIGHER_COLUMN						0x10
#define SSD1306_MEMORY_ADDR_MODE						0x20
#define SSD1306_SET_COLUMN_ADDR							0x21
#define SSD1306_SET_PAGE_ADDR							0x22

#define SSD1306_SET_START_LINE							0x40
#define SSD1306_SET_SEGMENT_REMAP						0xA0
#define SSD1306_SET_MULTIPLEX_RATIO						0xA8
#define SSD1306_COM_SCAN_DIR_INC						0xC0
#define SSD1306_COM_SCAN_DIR_DEC						0xC8
#define SSD1306_SET_DISPLAY_OFFSET						0xD3
#define SSD1306_SET_COM_PINS							0xDA
#define SSD1306_CHARGE_PUMP								0x8D

#define SSD1306_SET_DISPLAY_CLOCK_DIV_RATIO				0xD5
#define SSD1306_SET_PRECHARGE_PERIOD					0xD9
#define SSD1306_SET_VCOM_DESELECT						0xDB

/***************************************************************************************************
                             Commonly used OLED macros/Constants
***************************************************************************************************/
#define C_DefaultDigits     10

#define C_OledFirstLine_U8 0x00u
#define C_OledLastLine_U8  0x07u

#define C_FirstLineAddress_U8 0xB8
#define C_LastLineAddress_U8  0xBF

#define C_DisplayDefaultDigits_U8            0xffu // Will display the exact digits in the number
#define C_MaxDigitsToDisplay_U8              10u   // Max decimal/hexadecimal digits to be displayed
#define C_NumOfBinDigitsToDisplay_U8         16u   // Max bits of a binary number to be displayed
#define C_MaxDigitsToDisplayUsingPrintf_U8   C_DisplayDefaultDigits_U8 /* Max dec/hexadecimal digits to be displayed using printf */

#define C_MaxBarGraphs_U8     4
/**************************************************************************************************/


/***************************************************************************************************
                 PreCompile configurations to enable/disable the functions
****************************************************************************************************/
#define    Enable_OLED_DisplayString          0
#define    Enable_OLED_ScrollMessage          0
#define    Enable_OLED_DisplayNumber          0
#define    Enable_OLED_DisplayFloatNumber     0
#define    Enable_OLED_Printf                 0
#define    Enable_OLED_DisplayLogo            1
#define    Enable_OLED_EnableInversion        0
#define    Enable_OLED_DisableInversion       0
#define    ENABLE_OLED_VerticalGraph          0
#define    ENABLE_OLED_HorizontalGraph        0
#define    Enable_OLED_SetBrightness          0
#define    Enable_OLED_GoToLine               0


/***************************************************************************************************
                             Function Prototypes
 ***************************************************************************************************/
void OLED_Init(void);
void OLED_DisplayChar(uint8_t ch);
void SSD1306_PutC(uint8_t c);
void oled_put_str(char x, char y, String str);
void OLED_Clear(void);
void OLED_GoToPage(uint8_t );
void OLED_GoToLine(uint8_t );
void OLED_GoToNextLine(void);
void OLED_SetCursor(uint8_t lineNumber,uint8_t CursorPosition);
void OLED_SetBrightness(uint8_t brightnessValue);
void OLED_number(uint8_t dist);
void OLED_Disply_letter(uint8_t ch);
void OLED_Disply_Small(uint8_t ch);
void OLED_Disply_Small_Clear();
void OLED_Display_CLear_Number();
void OLED_clr();
void oledSendCommand(uint8_t cmd);
void OLED_loud(uint8_t ch);
/////-------------OLED_2------------------////
void OLED_Init_2(void);
void OLED_DisplayChar_2(uint8_t ch);
void OLED_Clear_2(void);
void OLED_GoToPage_2(uint8_t );
void OLED_GoToLine_2(uint8_t );
void OLED_GoToNextLine_2(void);
void OLED_SetCursor_2(uint8_t lineNumber,uint8_t CursorPosition);
void OLED_number_2(uint8_t dist);
void oledSendCommand_2(uint8_t cmd);
void OLED_loud_2(uint8_t ch);
void OLED_Disply_letter_2(uint8_t ch);
/**************************************************************************************************/   
#endif

oled.h

#include <Arduino.h>
#include "soft_i2c.h"

#define SCL_PIN 9
#define SDA_PIN 8
#define SCL_PIN1 16

void I2C_initiate() {
pinMode(SCL_PIN,OUTPUT);
pinMode(SCL_PIN1,OUTPUT);
pinMode(SDA_PIN,OUTPUT);
}

void I2C_Start(int add) {
  digitalWrite(SCL_PIN, 0);
  digitalWrite(SDA_PIN, 1);
  digitalWrite(SCL_PIN, 1);
  digitalWrite(SDA_PIN, 0);
  digitalWrite(SCL_PIN, 0);
  I2C_SendData(add);
}
void I2C_Start_1(int add) {
  digitalWrite(SCL_PIN1, 0);
  digitalWrite(SDA_PIN, 1);
  digitalWrite(SCL_PIN1, 1);
  digitalWrite(SDA_PIN, 0);
  digitalWrite(SCL_PIN1, 0);
  I2C_SendData_1(add);
}

void I2C_Stop() {
  digitalWrite(SCL_PIN, 0);
  digitalWrite(SDA_PIN, 0);
  digitalWrite(SCL_PIN, 1);
  digitalWrite(SDA_PIN, 1);
}
void I2C_Stop_1() {
  digitalWrite(SCL_PIN1, 0);
  digitalWrite(SDA_PIN, 0);
  digitalWrite(SCL_PIN1, 1);
  digitalWrite(SDA_PIN, 1);
}


void I2C_SendData(uint8_t v_i2cData_u8) {
  uint8_t i;

  for (i = 0; i < 8; i++) {
    digitalWrite(SDA_PIN,v_i2cData_u8 & 0x80);
    digitalWrite(SCL_PIN, 1);
    digitalWrite(SCL_PIN, 0);
    v_i2cData_u8 = v_i2cData_u8 << 1;
  }
  digitalWrite(SDA_PIN,0);
  digitalWrite(SCL_PIN, 1);
  digitalWrite(SCL_PIN, 0);
}
void I2C_SendData_1(uint8_t v_i2cData_u8) {
  uint8_t i;

  for (i = 0; i < 8; i++) {
    digitalWrite(SDA_PIN,v_i2cData_u8 & 0x80);
    digitalWrite(SCL_PIN1, 1);
    digitalWrite(SCL_PIN1, 0);
    v_i2cData_u8 = v_i2cData_u8 << 1;
  }
  digitalWrite(SDA_PIN, 0);
  digitalWrite(SCL_PIN1, 1);
  digitalWrite(SCL_PIN1, 0);
}

uint8_t I2C_Read() {
  pinMode(SDA_PIN,INPUT_PULLUP);
  uint8_t i, read;
  read = 0;
  for (i = 0; i < 8; i++) 
  {
    read = read << 1;
    digitalWrite(SCL_PIN1,1);
    if (digitalRead(SDA_PIN) == 1)
      read++;
    digitalWrite(SCL_PIN1 ,0);
  }
  pinMode(SDA_PIN,OUTPUT);
  digitalWrite(SDA_PIN,0);
  return read; 
}


soft_i2c.cpp

#ifndef soft_i2c_h
#define soft_i2c_h
#include <Arduino.h>
void I2C_initiate();

void I2C_Start(int add);
void I2C_Start_1(int add);

void I2C_Stop();
void I2C_Stop_1();

void I2C_SendData(uint8_t v_i2cData_u8);
void I2C_SendData_1(uint8_t v_i2cData_u8);

uint8_t I2C_Read();
#endif

soft_i2c.h

//Code written by Vijil Joy//

#ifndef MyTimer_h
#define MyTimer_h

class MyTimer {
  private:
    long hours, seconds, minutes, milliseconds;
    short int h, m, s, ms;
    unsigned long mls, ticks;
    bool flag = false, flag2 = false, flag3 = false;
    void (*callback)();
    void (*ont)(unsigned long ticks);

  public:
    void setCallback(void (*y)()) {
      callback = y;
    }
    
    void setOnTickCallback(void (*y)(unsigned long ticks)) {
      ont = y;
      flag3 = true;
    }

    void setTimeout(String str) {
      short int firstColon = str.indexOf(':');
      short int secondColon = str.indexOf(':', firstColon + 1);
      short int thirdColon = str.indexOf(':', secondColon + 1);

      h = str.substring(0, firstColon).toInt();
      m = str.substring(firstColon + 1, secondColon).toInt();
      s = str.substring(secondColon + 1, thirdColon).toInt();
      ms = str.substring(thirdColon + 1).toInt();

      flag = true;
      flag2 = true;
    }

    void setTimeout(long time_ms) {
      milliseconds = time_ms;
      flag = true;
      flag2 = false;
    }

    void run() {
      if (millis() - mls >= (flag2 ? 1000 : milliseconds) && flag == true) {
        ticks++;
        mls = millis();
        if (flag2) {
          if (flag3) ont(ticks);
          seconds++;
          if (seconds > 59) {
            seconds = 0;
            minutes++;
            if (minutes > 59) {
              minutes = 0;
              hours++;
            }
          }
        } else {
          flag = false;
          callback();
        }
      }

      if (seconds == s && minutes == m && hours == h && flag == true && flag2 == true) {
        flag = false;
        callback();
      }
    }

    void reset() {
      flag = true;
      seconds = minutes = hours = ticks = 0;
    }
};

String Time(int sec, int mnt = 0, int hrs = 0) {
  return (String(hrs) + ":" + String(mnt) + ":" + String(sec));
}

#endif
