House ECG

Every building has its own vibration rhythm. House ECG uses the motion sensors in a dedicated iPhone to observe that rhythm over time—much like a long-term ECG for a house. Mount an iPhone 8 or newer at a fixed structural point, connect continuous power, place the screen face up, and keep House ECG open in the foreground. The app measures motion 50 times per second, establishes an initial reading for that exact installation point, and compares later stable observations with the same point. House ECG includes: - Three-direction vibration measurement, with north–south and east–west directions shown only when the phone's direction reading is reliable. - Welch spectral averaging with Hann windows and 50% overlap to reduce the influence of incidental bumps and noise. - A low-cost continuous watcher that performs fuller analysis only after a candidate vibration is detected. - Local…