Piezoelectric is a device that can harvest energy in the form of electrical energy when it experiences deflection, an energy harvester that converts vibrations into electrical energy. Piezoelectricity is an interesting energy harvester to research and develop because it can be implemented directly and is environmentally friendly. However, piezoelectricity also has weaknesses such as the small and thin dimensions of the piezoelectric, causing a small deflection produced by the piezoelectric, the voltage produced is relatively small and the material is still relatively expensive. How to overcome this problem: research is being carried out to develop environmentally friendly energy harvesting machines that can be placed in public facilities. This research was carried out using real research methods, in a wind tunnel equipped with a bluff body at an angle of 40°, as well as a mini windmill as a contact area to cause collisions on the piezoelectric coated fins. The independent variables in this study are ceramic piezoelectric material and PVDF piezoelectric material, and wind speeds of 5 m/s, 7 m/s, and 9 m/s. Piezoelectric and mini windmills are installed in wind tunnels with bluff bodies. Electrical energy measurements use a data acquisition system, namely DATAQ, DataQ settings are carried out for 60 seconds. The test results showed that the highest voltage from the piezoelectric ceramic material produced the highest voltage, the maximum test data was 10.37 volts at a speed of 9 m/s, and the lowest voltage, the maximum test data was 4.50 volts at a speed of 5 m/s, which used plastic material fins.. The test results showed that the highest voltage from the piezoelectric PVDF material produced the highest voltage, the maximum test data was 0.387 volts at a speed of 9 m/s, and the lowest voltage, the maximum test data was 0.153 volts at a speed of 5 m/s, which used plastic material fins.
Keywords: Energy harvesters, piezoelectric ceramics, piezoelectric PVDF speed, windmills, electric voltage wind tunnels.