Energy harvester in Trampoline using piezoelectric

Piezoelectric energy harvester (PEH) is emerging as a novel device which can generate electrical energy by utilizing repetitive vibration or pressure. It is mainly used to collect ambient vibration energy to power sensors, chips and some other small applications. The objective of this research to propose an innovative method using trampoline and piezoelectric to produce low-power electrical energy. A trampoline design of the energy harvesting structure is proposed in this paper and tested using two types of balls in various elevation of falling ball namely 50, 60, 70, 80, 90, 100 cm. Ball is one of the components that can produce vibrations or pressure when reflected on the base. Futsal balls and volleyball balls are often used by people of various ages especially children. Where these two balls have almost the same dimension areas. Futsal ball and volley ball used in this research to measure the voltage generated by piezoelectric that mount in trampoline. The result show that maximum elevation in 100 cm generate the highest voltage in both of futsal ball and volley ball namely 2.36 volt and 1.95 volt. Futsal ball generate more voltage than volley ball due to their mass larger than volley ball. The higher mass of the ball that collision with trampoline mattress can generate the higher voltage due to the higher deflection in momentum. Therefore, this research is suitable on a children's playground to be able to produce a low power energy harvester.