The $12 Flood Insurance Policy — Auto-Shutoff Before a Pipe Bursts

You'll walk away with: A guardian on your water main that Claude Code built — leak-detection rope on the floor, a motorized brass ball valve on the main line, and ESPHome firmware that CLOSES the valve the instant water touches the rope, then CONFIRMS via position feedback that the valve actually reached closed (not just that it was told to), refuses to reopen until a human resets it, and watchdogs itself so the motor can never stall-burn.

🔒 This walkthrough is part of the full training. Choose a plan to unlock it.