IoT Sensors Are Not Measuring What You Think They Measure
IoT devices are often described as “detecting people”, “measuring distance”, “checking air quality”, “measuring body fat”, or “detecting leaks”. That language is fine at the product level, but it can be misleading when you design, install, or debug a device.
Most sensors do not measure those business concepts directly.
They first measure lower-level physical changes: acoustic flight time, electromagnetic echoes, infrared heat changes, light intensity, resistance, pressure, magnetic field, strain, or body impedance. Distance, presence, air quality, body fat percentage, and leak alarms are interpretations built on top of conversion, compensation, thresholds, calibration, and algorithms.
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