AcidClock

Minimalist RTC (DS3231) clock.
Displaying in two MAX7219 led matrices.
Feedback of complete date and temperature from Serial (USB).
All based on Arduino Nano (see diagram bellow).

Fonts used:

Made by me, "square" and "round" font.

Pic.1 - Square Matrix

Pic.2 - Dot Matrix

Wiring:

USE A GENERIC DS3231 CLOCK MODULE.

Final Result: