Created November 5, 2020 © LGPL
Eggtimer created using Arduino and millis function

I continue to experiment with millis function.
IntermediateFull instructions provided5,089
Eggtimer created using Arduino and millis function
Things used in this project

Hardware components

Arduino Nano R3
OLED SSD1306
Buzzer
Story

Few weeks back I posted a tutorial on millis function where I was using this function to multitask, process slice in Arduino Code.
In this Tutorial I am showing you how to create delayed trigger mechanism.
I use it to build the eggtimer but it can be used in the veriaty of projects
The full tutorial can be found here:
If you like this content and you want to support me in creating similar videos go to my Patreon webpagehttps://www.patreon.com/MariosIdeasOrhttps://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=7PD67JWZ9S3EJ&source=url
Code

Eggtimer
// Mario's Ideas
// Eggtimer created with Arduino and Millis
#include <SPI.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 32 // OLED display height, in pixels

#define Buzzer 12

int minutes_change=0;
int minutes=0;
int Current_Frame=1;

// State values 0 - setup 1- countdown
int State=0;
long Timestamp_Button_Pressed;

unsigned long Countdown_start;

// Declaration for SSD1306 display connected using software SPI 
#define OLED_MOSI   5
#define OLED_CLK   4
#define OLED_DC    7
#define OLED_CS    8
#define OLED_RESET 6
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT,OLED_MOSI, OLED_CLK, OLED_DC, OLED_RESET, OLED_CS);





// 'Marios_ideas', 128x32px
const unsigned char Logo [] PROGMEM = {
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x1f, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x1f, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x1f, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x1f, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x1f, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x1f, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x1f, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x1f, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 
  0x00, 0x00, 0x00, 0x00, 0x00, 0x0c, 0x00, 0x00, 0x00, 0x1f, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 
  0x00, 0x03, 0xce, 0x00, 0x00, 0x1e, 0x00, 0x04, 0x00, 0x1c, 0x7f, 0x8f, 0xff, 0xff, 0xff, 0xff, 
  0x00, 0x07, 0xff, 0x00, 0x00, 0x0c, 0x00, 0x0e, 0x00, 0x1c, 0x7f, 0x8f, 0xff, 0xff, 0xff, 0xff, 
  0x00, 0x0f, 0xff, 0x80, 0x00, 0x00, 0x00, 0x1c, 0x00, 0x1c, 0x7f, 0x8f, 0xff, 0xff, 0xff, 0xff, 
  0x00, 0x0e, 0x73, 0x87, 0x81, 0xdc, 0x1e, 0x08, 0x0c, 0x1c, 0x7c, 0x8f, 0x0f, 0xc3, 0xfc, 0xff, 
  0x00, 0x0e, 0x73, 0x8f, 0xc3, 0xdc, 0x7f, 0x00, 0x1c, 0x1c, 0x78, 0x8e, 0x07, 0x81, 0xf8, 0xff, 
  0x00, 0x0e, 0x73, 0x9f, 0xe3, 0x9c, 0x7f, 0x00, 0x3c, 0x1c, 0x70, 0x8c, 0x03, 0x00, 0xf0, 0xff, 
  0x00, 0x0e, 0x73, 0x9c, 0x63, 0x1c, 0xe3, 0x80, 0x3c, 0x1c, 0x71, 0x8c, 0x63, 0x1c, 0xf0, 0xff, 
  0x00, 0x0e, 0x73, 0x98, 0x63, 0x1c, 0xe3, 0x80, 0x38, 0x1c, 0x73, 0x8c, 0xc3, 0x3c, 0xf3, 0xff, 
  0x00, 0x0e, 0x73, 0x9c, 0x63, 0x1c, 0xe3, 0x80, 0x38, 0x1c, 0x71, 0x8c, 0x7f, 0x1c, 0xf3, 0xff, 
  0x00, 0x0e, 0x73, 0x9f, 0x63, 0x1c, 0x7f, 0x00, 0xf8, 0x1c, 0x70, 0x1c, 0x3f, 0x0c, 0xc3, 0xff, 
  0x00, 0x0e, 0x73, 0x8f, 0x63, 0x1c, 0x7f, 0x00, 0xf0, 0x1c, 0x78, 0x1e, 0x1f, 0x8c, 0xc7, 0xff, 
  0x00, 0x0e, 0x73, 0x87, 0x63, 0x1c, 0x1c, 0x00, 0xe0, 0x1c, 0x7c, 0x7f, 0x0f, 0xcc, 0xcf, 0xff, 
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x1f, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x1f, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x1f, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x1f, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x1f, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x1f, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x1f, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x1f, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x1f, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x1f, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x1f, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
};

// 'Marios_ideas', 128x32px
const unsigned char Logo1 [] PROGMEM = {
  0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xe0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
  0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xe0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
  0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xe0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
  0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xe0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
  0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xe0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
  0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xe0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
  0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xe0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
  0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xe0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
  0xff, 0xff, 0xff, 0xff, 0xff, 0xf3, 0xff, 0xff, 0xff, 0xe0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
  0xff, 0xfc, 0x31, 0xff, 0xff, 0xe1, 0xff, 0xfb, 0xff, 0xe3, 0x80, 0x70, 0x00, 0x00, 0x00, 0x00, 
  0xff, 0xf8, 0x00, 0xff, 0xff, 0xf3, 0xff, 0xf1, 0xff, 0xe3, 0x80, 0x70, 0x00, 0x00, 0x00, 0x00, 
  0xff, 0xf0, 0x00, 0x7f, 0xff, 0xff, 0xff, 0xe3, 0xff, 0xe3, 0x80, 0x70, 0x00, 0x00, 0x00, 0x00, 
  0xff, 0xf1, 0x8c, 0x78, 0x7e, 0x23, 0xe1, 0xf7, 0xf3, 0xe3, 0x83, 0x70, 0xf0, 0x3c, 0x03, 0x00, 
  0xff, 0xf1, 0x8c, 0x70, 0x3c, 0x23, 0x80, 0xff, 0xe3, 0xe3, 0x87, 0x71, 0xf8, 0x7e, 0x07, 0x00, 
  0xff, 0xf1, 0x8c, 0x60, 0x1c, 0x63, 0x80, 0xff, 0xc3, 0xe3, 0x8f, 0x73, 0xfc, 0xff, 0x0f, 0x00, 
  0xff, 0xf1, 0x8c, 0x63, 0x9c, 0xe3, 0x1c, 0x7f, 0xc3, 0xe3, 0x8e, 0x73, 0x9c, 0xe3, 0x0f, 0x00, 
  0xff, 0xf1, 0x8c, 0x67, 0x9c, 0xe3, 0x1c, 0x7f, 0xc7, 0xe3, 0x8c, 0x73, 0x3c, 0xc3, 0x0c, 0x00, 
  0xff, 0xf1, 0x8c, 0x63, 0x9c, 0xe3, 0x1c, 0x7f, 0xc7, 0xe3, 0x8e, 0x73, 0x80, 0xe3, 0x0c, 0x00, 
  0xff, 0xf1, 0x8c, 0x60, 0x9c, 0xe3, 0x80, 0xff, 0x07, 0xe3, 0x8f, 0xe3, 0xc0, 0xf3, 0x3c, 0x00, 
  0xff, 0xf1, 0x8c, 0x70, 0x9c, 0xe3, 0x80, 0xff, 0x0f, 0xe3, 0x87, 0xe1, 0xe0, 0x73, 0x38, 0x00, 
  0xff, 0xf1, 0x8c, 0x78, 0x9c, 0xe3, 0xe3, 0xff, 0x1f, 0xe3, 0x83, 0x80, 0xf0, 0x33, 0x30, 0x00, 
  0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xe0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
  0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xe0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
  0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xe0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
  0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xe0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
  0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xe0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
  0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xe0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
  0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xe0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
  0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xe0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
  0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xe0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
  0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xe0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
  0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xe0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
};

// 'Bell1', 58x32px
const unsigned char Bell1 [] PROGMEM = {
  0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xc0, 0xff, 0xff, 0xff, 0xc3, 0xff, 0xff, 0xff, 0xc0, 
  0xff, 0xff, 0xff, 0xdb, 0xff, 0xff, 0xff, 0xc0, 0xff, 0xff, 0xff, 0x99, 0xff, 0xff, 0xff, 0xc0, 
  0xff, 0xff, 0xff, 0x00, 0xff, 0xff, 0xff, 0xc0, 0xff, 0xff, 0xfc, 0x00, 0x3f, 0xff, 0xff, 0xc0, 
  0xff, 0xff, 0xf8, 0x00, 0x1f, 0xff, 0xff, 0xc0, 0xff, 0xff, 0xf8, 0x00, 0x1f, 0xff, 0xff, 0xc0, 
  0xff, 0xff, 0xf8, 0x00, 0x0f, 0xff, 0xff, 0xc0, 0xff, 0xff, 0xf0, 0x00, 0x0f, 0xff, 0xff, 0xc0, 
  0xff, 0xff, 0xf0, 0x00, 0x0f, 0xff, 0xff, 0xc0, 0xff, 0xff, 0xf0, 0x00, 0x0f, 0xff, 0xff, 0xc0, 
  0xff, 0xff, 0xe0, 0x00, 0x0f, 0xff, 0xff, 0xc0, 0xff, 0xff, 0xe0, 0x00, 0x07, 0xff, 0xff, 0xc0, 
  0xff, 0xff, 0xe0, 0x00, 0x07, 0xff, 0xff, 0xc0, 0xff, 0xff, 0xe0, 0x00, 0x07, 0xff, 0xff, 0xc0, 
  0xff, 0xff, 0xe0, 0x00, 0x07, 0xff, 0xff, 0xc0, 0xff, 0xff, 0xe0, 0x00, 0x07, 0xff, 0xff, 0xc0, 
  0xff, 0xff, 0xc0, 0x00, 0x03, 0xff, 0xff, 0xc0, 0xff, 0xff, 0xc0, 0x00, 0x03, 0xff, 0xff, 0xc0, 
  0xff, 0xff, 0x80, 0x00, 0x01, 0xff, 0xff, 0xc0, 0xff, 0xfe, 0x00, 0x00, 0x00, 0x7f, 0xff, 0xc0, 
  0xff, 0xfe, 0x00, 0x00, 0x00, 0x7f, 0xff, 0xc0, 0xff, 0xfc, 0x00, 0x00, 0x00, 0x3f, 0xff, 0xc0, 
  0xff, 0xfc, 0x00, 0x00, 0x00, 0x3f, 0xff, 0xc0, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xc0, 
  0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xc0, 0xff, 0xff, 0xff, 0x00, 0xff, 0xff, 0xff, 0xc0, 
  0xff, 0xff, 0xff, 0x00, 0xff, 0xff, 0xff, 0xc0, 0xff, 0xff, 0xff, 0x81, 0xff, 0xff, 0xff, 0xc0, 
  0xff, 0xff, 0xff, 0xe7, 0xff, 0xff, 0xff, 0xc0, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xc0
};
// 'Bell2', 58x32px
const unsigned char Bell2 [] PROGMEM = {
  0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xc0, 0xff, 0xff, 0xff, 0xc3, 0xff, 0xff, 0xff, 0xc0, 
  0xff, 0xff, 0xff, 0xdb, 0xff, 0xff, 0xff, 0xc0, 0xff, 0xff, 0xff, 0x99, 0xff, 0xff, 0xff, 0xc0, 
  0xff, 0xff, 0xff, 0x00, 0xff, 0xff, 0xff, 0xc0, 0xff, 0xff, 0xfc, 0x00, 0x3f, 0xff, 0xff, 0xc0, 
  0xff, 0xff, 0xf8, 0x00, 0x1f, 0xff, 0xff, 0xc0, 0xff, 0xff, 0xf8, 0x00, 0x1f, 0xff, 0xff, 0xc0, 
  0xff, 0xff, 0xf8, 0x00, 0x0f, 0xff, 0xff, 0xc0, 0xff, 0xff, 0xf0, 0x00, 0x0f, 0xff, 0xff, 0xc0, 
  0xff, 0xfb, 0xf0, 0x00, 0x0f, 0xdf, 0xff, 0xc0, 0xff, 0xfb, 0xf0, 0x00, 0x0f, 0xdf, 0xff, 0xc0, 
  0xff, 0xf3, 0xe0, 0x00, 0x0f, 0xcf, 0xff, 0xc0, 0xff, 0xf3, 0xe0, 0x00, 0x07, 0xcf, 0xff, 0xc0, 
  0xff, 0xf3, 0xe0, 0x00, 0x07, 0xcf, 0xff, 0xc0, 0xff, 0xfb, 0xe0, 0x00, 0x07, 0xdf, 0xff, 0xc0, 
  0xff, 0xfb, 0xe0, 0x00, 0x07, 0xdf, 0xff, 0xc0, 0xff, 0xff, 0xe0, 0x00, 0x07, 0xff, 0xff, 0xc0, 
  0xff, 0xff, 0xc0, 0x00, 0x03, 0xff, 0xff, 0xc0, 0xff, 0xff, 0xc0, 0x00, 0x03, 0xff, 0xff, 0xc0, 
  0xff, 0xff, 0x80, 0x00, 0x01, 0xff, 0xff, 0xc0, 0xff, 0xfe, 0x00, 0x00, 0x00, 0x7f, 0xff, 0xc0, 
  0xff, 0xfe, 0x00, 0x00, 0x00, 0x7f, 0xff, 0xc0, 0xff, 0xfc, 0x00, 0x00, 0x00, 0x3f, 0xff, 0xc0, 
  0xff, 0xfc, 0x00, 0x00, 0x00, 0x3f, 0xff, 0xc0, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xc0, 
  0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xc0, 0xff, 0xff, 0xff, 0x00, 0xff, 0xff, 0xff, 0xc0, 
  0xff, 0xff, 0xff, 0x00, 0xff, 0xff, 0xff, 0xc0, 0xff, 0xff, 0xff, 0x81, 0xff, 0xff, 0xff, 0xc0, 
  0xff, 0xff, 0xff, 0xe7, 0xff, 0xff, 0xff, 0xc0, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xc0
};
// 'Bell3', 58x32px
const unsigned char Bell3 [] PROGMEM = {
  0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xc0, 0xff, 0xff, 0xff, 0xc3, 0xff, 0xff, 0xff, 0xc0, 
  0xff, 0xff, 0xff, 0xdb, 0xff, 0xff, 0xff, 0xc0, 0xff, 0xff, 0xff, 0x99, 0xff, 0xff, 0xff, 0xc0, 
  0xff, 0xff, 0xff, 0x00, 0xff, 0xff, 0xff, 0xc0, 0xff, 0xff, 0xfc, 0x00, 0x3f, 0xff, 0xff, 0xc0, 
  0xff, 0xff, 0xf8, 0x00, 0x1f, 0xff, 0xff, 0xc0, 0xff, 0xdf, 0xf8, 0x00, 0x1f, 0xfb, 0xff, 0xc0, 
  0xff, 0x9f, 0xf8, 0x00, 0x0f, 0xf9, 0xff, 0xc0, 0xff, 0x1f, 0xf0, 0x00, 0x0f, 0xf8, 0xff, 0xc0, 
  0xfe, 0x3b, 0xf0, 0x00, 0x0f, 0xdc, 0x7f, 0xc0, 0xfe, 0x3b, 0xf0, 0x00, 0x0f, 0xdc, 0x7f, 0xc0, 
  0xfe, 0x73, 0xe0, 0x00, 0x0f, 0xce, 0x7f, 0xc0, 0xfe, 0x73, 0xe0, 0x00, 0x07, 0xce, 0x7f, 0xc0, 
  0xfe, 0x73, 0xe0, 0x00, 0x07, 0xce, 0x7f, 0xc0, 0xfe, 0x7b, 0xe0, 0x00, 0x07, 0xde, 0x7f, 0xc0, 
  0xfe, 0x3b, 0xe0, 0x00, 0x07, 0xdc, 0x7f, 0xc0, 0xff, 0x3f, 0xe0, 0x00, 0x07, 0xfc, 0xff, 0xc0, 
  0xff, 0x9f, 0xc0, 0x00, 0x03, 0xf9, 0xff, 0xc0, 0xff, 0x9f, 0xc0, 0x00, 0x03, 0xf9, 0xff, 0xc0, 
  0xff, 0xff, 0x80, 0x00, 0x01, 0xff, 0xff, 0xc0, 0xff, 0xfe, 0x00, 0x00, 0x00, 0x7f, 0xff, 0xc0, 
  0xff, 0xfe, 0x00, 0x00, 0x00, 0x7f, 0xff, 0xc0, 0xff, 0xfc, 0x00, 0x00, 0x00, 0x3f, 0xff, 0xc0, 
  0xff, 0xfc, 0x00, 0x00, 0x00, 0x3f, 0xff, 0xc0, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xc0, 
  0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xc0, 0xff, 0xff, 0xff, 0x00, 0xff, 0xff, 0xff, 0xc0, 
  0xff, 0xff, 0xff, 0x00, 0xff, 0xff, 0xff, 0xc0, 0xff, 0xff, 0xff, 0x81, 0xff, 0xff, 0xff, 0xc0, 
  0xff, 0xff, 0xff, 0xe7, 0xff, 0xff, 0xff, 0xc0, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xc0
};
// 'Bell4', 58x32px
const unsigned char Bell4 [] PROGMEM = {
  0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xc0, 0xff, 0xff, 0xff, 0xc3, 0xff, 0xff, 0xff, 0xc0, 
  0xff, 0xff, 0xff, 0xdb, 0xff, 0xff, 0xff, 0xc0, 0xff, 0xff, 0xff, 0x99, 0xff, 0xff, 0xff, 0xc0, 
  0xfd, 0xff, 0xff, 0x00, 0xff, 0xff, 0xbf, 0xc0, 0xf8, 0xff, 0xfc, 0x00, 0x3f, 0xff, 0x1f, 0xc0, 
  0xf1, 0xff, 0xf8, 0x00, 0x1f, 0xff, 0x8f, 0xc0, 0xf3, 0xdf, 0xf8, 0x00, 0x1f, 0xfb, 0xcf, 0xc0, 
  0xe3, 0x9f, 0xf8, 0x00, 0x0f, 0xf9, 0xc7, 0xc0, 0xe7, 0x1f, 0xf0, 0x00, 0x0f, 0xf8, 0xe7, 0xc0, 
  0xc6, 0x3b, 0xf0, 0x00, 0x0f, 0xdc, 0x63, 0xc0, 0xc6, 0x3b, 0xf0, 0x00, 0x0f, 0xdc, 0x63, 0xc0, 
  0xc6, 0x73, 0xe0, 0x00, 0x0f, 0xce, 0x63, 0xc0, 0xc6, 0x73, 0xe0, 0x00, 0x07, 0xce, 0x63, 0xc0, 
  0xc6, 0x73, 0xe0, 0x00, 0x07, 0xce, 0x63, 0xc0, 0xc6, 0x7b, 0xe0, 0x00, 0x07, 0xde, 0x63, 0xc0, 
  0xc6, 0x3b, 0xe0, 0x00, 0x07, 0xdc, 0x63, 0xc0, 0xe7, 0x3f, 0xe0, 0x00, 0x07, 0xfc, 0xe7, 0xc0, 
  0xe3, 0x9f, 0xc0, 0x00, 0x03, 0xf9, 0xc7, 0xc0, 0xf3, 0x9f, 0xc0, 0x00, 0x03, 0xf9, 0xcf, 0xc0, 
  0xf1, 0xff, 0x80, 0x00, 0x01, 0xff, 0x8f, 0xc0, 0xf8, 0xfe, 0x00, 0x00, 0x00, 0x7f, 0x1f, 0xc0, 
  0xfd, 0xfe, 0x00, 0x00, 0x00, 0x7f, 0xbf, 0xc0, 0xff, 0xfc, 0x00, 0x00, 0x00, 0x3f, 0xff, 0xc0, 
  0xff, 0xfc, 0x00, 0x00, 0x00, 0x3f, 0xff, 0xc0, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xc0, 
  0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xc0, 0xff, 0xff, 0xff, 0x00, 0xff, 0xff, 0xff, 0xc0, 
  0xff, 0xff, 0xff, 0x00, 0xff, 0xff, 0xff, 0xc0, 0xff, 0xff, 0xff, 0x81, 0xff, 0xff, 0xff, 0xc0, 
  0xff, 0xff, 0xff, 0xe7, 0xff, 0xff, 0xff, 0xc0, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xc0
};

void Press_A_Button(){
  if (millis() - Timestamp_Button_Pressed>200){
    if (State==0) minutes = minutes+1;
    Timestamp_Button_Pressed=millis();
  }
}

void Press_B_Button(){
  if (millis() - Timestamp_Button_Pressed>200){
    if (State==0){
      Countdown_start=millis();
      State=1; 
    }
    else{
      State=0;
      minutes =0;
    }
  }
}

void setup() {
  attachInterrupt(digitalPinToInterrupt(2), Press_A_Button,RISING);
  attachInterrupt(digitalPinToInterrupt(3), Press_B_Button,RISING);
  
  Timestamp_Button_Pressed=millis();

  pinMode(Buzzer, OUTPUT);
  digitalWrite(Buzzer,LOW);
  
  // SSD1306_SWITCHCAPVCC = generate display voltage from 3.3V internally
  if(!display.begin(SSD1306_SWITCHCAPVCC)) {
    Serial.println(F("SSD1306 allocation failed"));
    for(;;); // Don't proceed, loop forever
  }
   Serial.begin(9600);
  // Show initial display buffer contents on the screen --
  // the library initializes this with an Adafruit splash screen.
  display.display();
  delay(2000); // Pause for 2 seconds

  // Displaying My Channel Logo
  // Displaying 4x Positive and Negative of the Channel Logo in sequence 
  
  for (int i=1 ; i<5; i++){
    display.clearDisplay();
    display.drawBitmap(0,0,Logo, 128, 32, 1);
    display.display();
    delay(500);
    display.clearDisplay();
    display.drawBitmap(0,0,Logo1, 128, 32, 1);
    display.display();
    delay(500);
  }
  display.clearDisplay();
  display.setTextSize(2);            
  display.setCursor(5,0);
  display.setTextColor(SSD1306_WHITE);
  display.println((String)minutes+" min");
  display.display();
}

void Ring_Bell(int Frame){
  display.clearDisplay();
  display.fillRect(0, 0, 30, 32, SSD1306_WHITE);
  display.fillRect(88, 0, 30, 32, SSD1306_WHITE);
  if (Frame==1)display.drawBitmap(30,0,Bell1, 58, 32, 1);
  if (Frame==2)display.drawBitmap(30,0,Bell2, 58, 32, 1);
  if (Frame==3)display.drawBitmap(30,0,Bell3, 58, 32, 1);
  if (Frame==4)display.drawBitmap(30,0,Bell4, 58, 32, 1);
  display.display();
  if (Frame>1){
    delay(200);
    digitalWrite(Buzzer,HIGH);
  }
  else {
    digitalWrite(Buzzer,LOW);
    delay(1000); 
  }
}

String TimeLeft(unsigned long MsLeft){
  String Result;
  int M;
  int S;
  M=(long)MsLeft/60000;
  Serial.print(MsLeft);
  Serial.print(";");
  Serial.println(M);
  if (M<10) Result=(String)"0"+ M + ":";else Result=(String)M+":";
  S=(long)((MsLeft-M*60000)/1000);
  if (S<10) Result=(String)Result + "0"+ S ;else Result=(String)Result +S;
  return Result;
  
}

void loop() {
  
  if (State==0 ){
    digitalWrite(Buzzer,LOW);
    display.clearDisplay();
    display.setTextSize(2);            
    display.setCursor(5,0);
    display.setTextColor(SSD1306_WHITE);
    display.println((String)minutes+" min");
    display.display();
  }
  if(State==1){
    if(minutes*60000 >(millis()-Countdown_start)){
      display.clearDisplay();
      display.setCursor(5,0);
      display.setTextSize(4);            
      display.setTextColor(SSD1306_WHITE);
      display.println(TimeLeft((minutes*60000-(millis()-Countdown_start)))); 
      display.display();
    } 
    else {
     Ring_Bell(Current_Frame); 
     Current_Frame=Current_Frame+1;
     if (Current_Frame==5) Current_Frame=1;
    }
  }
}
Eggtimer created using Arduino and millis function

Things used in this project

Hardware components

Story

Schematics

Schematics

Code

Eggtimer

Credits

mdraber

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Eggtimer created using Arduino and millis function

Eggtimer created using Arduino and millis function

Things used in this project

Hardware components

Story

Schematics

Schematics

Code

Eggtimer

Credits

mdraber

Comments

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