Piezoelectric Based Self-Powered Force Detection System With Wireless Communication

Ho, Wen Quan (2016) Piezoelectric Based Self-Powered Force Detection System With Wireless Communication. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

This project is about a piezoelectric based energy harvesting system that able to harvest energy from force produced by human footstep to power up a radio frequency transmitter to transmitter signal to receiver station and trigger nearby electronic devices. The purpose of this project is to design an energy harvesting circuit and integrate it with a wireless module. In this project, three different rectifier circuits were designed, developed and experiment had been carried out to determine the most efficient rectifier circuit. Afterwards,drop test was carried out to determine the optimum resistance of the piezoelectric cantilever used in this project. Next, a piezoelectric energy harvesting circuit was designed to convert the AC voltage that generated by the piezoelectric, into DC voltage for powering RF transmitter which transmits signal to a receiver station within a few meters away.Therefore, piezoelectric was being used as sensor and generator. Full wave bridge rectifier that made of Schottky Diodes was found to be the efficient rectifier circuit with 3% to 6% of voltage drop to be used in this project. On the other hand, the proposed system can produced power up to 8mW at resistance of 2kΩ according to the result of drop test. The system has been proven to function as expected, which can be seen that the security siren and interactive advertisement slides are triggered when the system is being tested by stepping on the piezoelectric harvester unit.

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