Browsing by Subject "Kinetic energy harvesting"

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    Design of a batteryless sensor for human activity recognition
    (2024-05) Huang, Tianda; Marculescu, Radu (Electrical engineer); Lu, Nanshu
    Recent advancements in sensing technology coupled with the proliferation of cheap, low power computing have enabled the growing popularity of wearable sensors in everyday activities. Inertial sensing, particularly for human activity recognition (HAR), has emerged as a ubiquitous tool across fitness, healthcare, and entertainment applications. However, conventional wearable sensors rely on batteries, introducing limitations in cost, environmental impact, and user burden. This thesis explores a solution to the limitations of battery-powered operation with the design and implementation of a wearable, kinetic energy harvesting (KEH) powered wireless inertial sensor for batteryless HAR. The KEH-powered sensor is energy optimized to require only 140µJ per set of accelerometer samples, translating to an average power draw of 90µJ during continuous operation. The idle power consumption is only 9.2µJ while connected over Bluetooth. Energy harvesting is achieved by a rotational unbalanced mass electromagnetic harvester with a peak power output of 1.3mW.