This one was written as it happened, in six parts, over about three months in 2023. It starts with a wrist-mounted flamethrower that never got built and ends with six propane cannisters in the front yard taking their cues over ESP-NOW.
Read the parts in order; the mistakes are half the story. Part III is where I finally designed a real PCB, and Part V is the one where things went wrong on camera. If you only want the working code and the final wiring, skip to Part VI. It’s the longest of the six for a reason.