Simple clock that always shows the correct time. GPS reception is required. Selection between summer and winter time must be done manually. Only a few components and easy to build even on a breadboard.

Please follow the project guide in the attached files. 

The project is built around an ATMEGA328P chip or board, and to fit within the glass dome, it is recommended to use an Arduino Mini Pro 5V version since the ATMEGA328P chip requires a 5V supply and the LED matrix is not compatible with 3.3V. When using the ATMEGA328P chip, the proper settings are: Bootloader set to "No bootloader" and Clock set to "Internal 8MHz." This setup is cost-friendly, making it ideal for Arduino beginners, and supports various features such as serial, I2C, and SPI communication, as well as analog and digital input, interrupt subroutines, and the use of a two-dimensional array, all contributing to a nice end result.