The Dew-Point Margin — Catch the Cold Wall That's Going to Grow Mold, Weeks Before It Does
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What you'll do
A two-sensor watcher on the coldest surface in one room that Claude Code built with you — a Raspberry Pi Pico W reading the room's air temperature and humidity with an SHT4x and the surface's own temperature with a DS18B20 probe, computing the dew point and the surface relative humidity from the Magnus equation on the board itself, alerting your phone when that surface comes within a degree and a half of sweating, logging a row every fifteen minutes to a file you pull down over your own network, and a report Claude Code regenerates on demand that scores the surface against the three running-average mold criteria in ASHRAE Standard 160, projects the week the 30-day average crosses 80 percent, and refuses to project anything when the clock was unsynced or the data is too thin to support it.