A led display taking advantage of the transparency of PCBs FR4 board charlieplexing a couple of leds with a ESP32 C3, it display time and temperature, auto time sync based on IP.
All files and information:
https://github.com/LED-BOY/PCB-Led-dispaly-wifi-clock
Both the github repo and this page has "display" spelled wrong. How is that even possible to do twice? :D