Abstract
This study covers a self-powered wireless communication system that is powered using a piezoelectric energy harvester (PEH) in a shoe. The lead-zirconate-titanate (PZT) ceramic of the PEH was coated with UV resin, which (after curing under UV light) allowed it to withstand periodic pressure. The PEH was designed with a simple structure and placed under the sole of a shoe. The durability of the PEH was tested using a pushing tester and its applicability in shoes was examined. With periodic compression of 60 kg, the PEH produced 52 μW of energy at 280 kΩ. The energy generated by the PEH was used to power a wireless transmitter. A step-down converter with an under-voltage lockout function was used to gather enough energy to operate the wireless transmitter. The transmitter can be operated initially after walking 24 steps. After the transmitter has been activated, it can be operated again after 8 steps. Because a control center receives signals from the transmitter, it is possible to check the status of workers who work outside at night or mostly alone, to detect emergencies.
Highlights
Accepted: 27 December 2021As technology advances, people are more able to address concerns about their safety and health
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Summary
People are more able to address concerns about their safety and health. To meet these needs, various products including wearable devices are being released, and these devices are used to collect and process user information like bio-signals, location, and momentum. Due to the limited hours of any battery, users cannot avoid the constant struggle of recharging or replacing batteries. For this reason, low-power circuits have been developed to reduce battery consumption over extended periods of time [1,2,3]. For wearable devices, this design problem gets worse because the space available for a battery is very limited
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