Smart Easter Egg with ESP32

1#include <Arduino.h>
2#include <U8g2lib.h>
3#include <Wire.h>
4#include <WiFi.h>
5#include <NTPClient.h>
6#include <WiFiUdp.h>
7
8// --- CONFIGURATION ---
9const char* ssid     = "Zeno-Modiff";
10const char* password = "Crack_it@990";
11
12// Target: April 5, 2026, 00:00:00 (Easter Sunday)
13const long targetEpoch = 1775413800; 
14const long utcOffset   = 19800; // IST (UTC +5:30)
15
16U8G2_SSD1306_128X64_NONAME_F_HW_I2C u8g2(U8G2_R0);
17WiFiUDP ntpUDP;
18NTPClient timeClient(ntpUDP, "pool.ntp.org", utcOffset);
19
20// --- 32x32 BOOT ICON ---
21static const unsigned char big_egg_32x32[] = {
22  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xf0, 0x0f, 0x00, 
23  0x00, 0xfc, 0x3f, 0x00, 0x00, 0xff, 0xff, 0x00, 0x80, 0xff, 0xff, 0x01, 
24  0x80, 0xff, 0xff, 0x01, 0xc0, 0xff, 0xff, 0x03, 0xc0, 0xff, 0xff, 0x03, 
25  0xe0, 0x0f, 0xf0, 0x07, 0xe0, 0x07, 0xe0, 0x07, 0xf0, 0x67, 0xe6, 0x0f, 
26  0xf0, 0xf3, 0xcf, 0x0f, 0xf0, 0xf3, 0xcf, 0x0f, 0xf0, 0x67, 0xe6, 0x0f, 
27  0xf0, 0xff, 0xff, 0x0f, 0xf0, 0xff, 0xff, 0x0f, 0xf0, 0xff, 0xff, 0x0f, 
28  0xf0, 0xff, 0xff, 0x0f, 0xf0, 0xff, 0xff, 0x0f, 0xe0, 0xff, 0xff, 0x07, 
29  0xe0, 0xff, 0xff, 0x07, 0xc0, 0xff, 0xff, 0x03, 0xc0, 0xff, 0xff, 0x03, 
30  0x80, 0xff, 0xff, 0x01, 0x00, 0xff, 0xff, 0x00, 0x00, 0xfc, 0x3f, 0x00, 
31  0x00, 0xf0, 0x0f, 0x00, 0x00, 0xc0, 0x03, 0x00, 0x00, 0x00, 0x00, 0x00, 
32  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 
33};
34
35void showBootIcon() {
36  float y = 0; float velocity = 0; float gravity = 0.4; float bounce = -0.7;
37  int groundLevel = 32;
38  unsigned long startTime = millis();
39  while (millis() - startTime < 4000) {
40    u8g2.clearBuffer();
41    velocity += gravity; y += velocity;
42    if (y > groundLevel) { y = groundLevel; velocity *= bounce; }
43    u8g2.drawXBM(48, (int)y, 32, 32, big_egg_32x32);
44    u8g2.sendBuffer();
45    delay(10); 
46  }
47}
48
49void setup() {
50  u8g2.begin();
51  showBootIcon();
52
53  WiFi.begin(ssid, password);
54  while (WiFi.status() != WL_CONNECTED) {
55    u8g2.clearBuffer();
56    u8g2.drawXBM(48, 16, 32, 32, big_egg_32x32); // Static egg while connecting
57    u8g2.sendBuffer();
58    delay(500);
59  }
60  timeClient.begin();
61}
62
63void loop() {
64  timeClient.update();
65  unsigned long currentEpoch = timeClient.getEpochTime();
66  u8g2.clearBuffer();
67
68  if (targetEpoch > currentEpoch) {
69    unsigned long diff = targetEpoch - currentEpoch;
70    
71    int days = diff / 86400;
72    int hours = (diff % 86400) / 3600;
73    int mins = (diff % 3600) / 60;
74    int secs = diff % 60;
75
76    char dayStr[15];
77    char timeStr[15];
78    sprintf(dayStr, "%d DAYS", days);
79    sprintf(timeStr, "%02d:%02d:%02d", hours, mins, secs);
80
81    // --- LINE 1: Header ---
82    u8g2.setFont(u8g2_font_6x12_tr);
83    u8g2.drawStr(36, 12, "EASTER IN");
84
85    // --- LINE 2: Days ---
86    u8g2.setFont(u8g2_font_logisoso18_tr);
87    u8g2.drawStr(25, 40, dayStr);
88
89    // --- LINE 3: Time + Small "Hrs" ---
90    u8g2.setFont(u8g2_font_7x14_tr);
91    u8g2.drawStr(30, 62, timeStr); 
92
93    u8g2.setFont(u8g2_font_5x7_tr);
94    u8g2.drawStr(90, 62, "Hrs"); 
95
96  } else {
97    u8g2.setFont(u8g2_font_logisoso18_tr);
98    u8g2.drawStr(10, 42, "HAPPY EASTER!");
99  }
100
101  u8g2.sendBuffer();
102  delay(1000); 
103}