What the leak detector taught me about real-world noise

Before I built the leak detector, I thought sensors just worked. You connect them, they give you data, you use that data. Simple. That is not how it goes. The problem The SW-420 vibration sensor is a small, cheap component. When something vibrates near it, the output goes HIGH. When it stops, it goes LOW. On paper this is exactly what you need to detect a leaking pipe — the leak creates a constant vibration, the sensor picks it up, you trigger an alarm. In reality, everything vibrates. A truck d