A modular, feature-rich LED clock with alarms, menu navigation, and startup animations – all running on an Arduino!
- Real-time clock (DS3231)
- LED or 7-segment display (MAX7219/TM1637)
- Alarm with EEPROM storage
- Button-based settings menu
- 12/24h support and animated startup
| RTC Pin | Arduino Pin |
|---|---|
| SDA | A4 (Uno) |
| SCL | A5 (Uno) |
| VCC | 5V |
| GND | GND |
| Button | Arduino Pin |
|---|---|
| Mode Button | 2 |
| Up Button | 3 |
| Down Button | 4 |
Refer to your display's documentation; connect via SPI or DIO/CLK as required.
| Buzzer Lead | Arduino Pin |
|---|---|
| + | 13 |
| - | GND |