Shenanigans with pulling sword out of stone. Only the chosen one['s] are fit to be a king.
As a part of sword exibition, we made artifitial stone to hold a sword. Sword was locked in stone by mechanism, and by random chance, relesased. Participant of exibition could then try and pull the sword out of stone, if GOD of random was on their side, they would then become Kings.
https://github.com/marcelicmateo/king_arthur_sword
Run platformio and compile.
This was builded and tested on Espressif, ESP8266 based dev board, Nodemcu v1.
Project details and development decisions are described on WIKI.