A simple esp32 based clock module. This clock connects to the internet via WIFI and synchronizes with NTP. Before the first use, set the time zone and WIFI access in the main.cpp file. You won't need to set the time anymore; it will always be accurate.

BOM:

• ESP32 module
• 4x8x8 (or 3x8x8) led matrix 
• USB charger/power supply

ESP32 firmware source code: https://github.com/Pethical/ESPClock