LiquidSense: Liquid Level Sensing Using Commodity WiFi in a Smart Home Environment
summary
System uses commodity WiFi and a low-cost surface-mounted transducer to induce container resonance and detect liquid level from subtle CSI phase shifts, extracting the first resonance via PCA + STFT and mapping frequency to level with piecewise cubic curve fitting (continuous) and linear-kernel SVM (discrete). Implemented with two laptops (5GHz, 2kpps) and four common containers and six liquids in homes, it achieves 97% continuous accuracy and 0.968 F-score for discrete prediction, working in NLOS. uses commodity WiFi low-cost transducer
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