Search

Internet of Thing (IoT) makes the monitoring and controlling process become accessible everywhere and every time. In this paper, the IoT is used to control the speed of a DC Motor remotely through smartphone apps. The proposed system uses the 50Wp solar panel and DC-DC Converter to provide 24V dc to the motor. In specific, a PID algorithm is applied to control motor speed from the measured back EMF. There are 3 experiments that have been done. The first is controlling motor speed through a smart phone, the second is the relationship between EMF and DC Motor speed, the third experiment was monitoring motor speed on Thingspeak and Blynk apps.

Dye-sensitized solar cells (DSSC) made of TiO2 have received considerable attention from many researchers for the last three decades. Rapid theoretical and experimental studies have been conducted to improve the performance of DSSC. To understand the DSSC internal parameters, we need to fine-tune each component and identify the suitable conditions in optimizing the performance of assembled devices. In this work, we analyzed and calculated of several parameters the DSSC photoanode, e.g. electron diffusion and photon absorption coefficients. The experimental I-V data from solar simulator measurements were fitted base on electron diffusion model using Microcal Origin software. We compared the photon absorption coefficient values from this calculation method with the result of UV-Vis measurement and compared the electron diffusion coefficient values with the result of the SEM image data fitting calculation method. It was apparent that the results of I-V data fitting calculation method were comparable with the results of two other techniques.

Solar energy can be converted into hydrogen fuel using photoelectrochemical (PEC) cell through split water molecules. Among semiconductor metal oxide materials, ZnO material has shown promising potential as PEC cells due to the large band gap value (3.37 eV), high excitation energy (60 meV), abundant material, and non-toxic. ZnO in the form of nanorods (NRs) can increase the conversion efficiency of the PEC performance because of the large surface area. In this research, we investigated the influence of zinc nitrate concentrations on the morphology of ZnO NRs on the stainless steel substrate and its PEC performance. Stainless steel was chosen as a substrate because of high conductivity, excellent corrosion resistance, and inexpensive. ZnO NRs are synthesized by the hydrothermal method. The structure and morphology of ZnO NRs were characterized by XRD and SEM. While PEC performances were studied using two probe method. The graph of current versus times was fitted by an exponential equation to determine time response and time decay of ZnO NRs. We found that ZnO NRs has good photoresponse but the current value is low.

Photo-supercapacitor is a combination of solar cells and supercapacitor which intensively being developed. Photo-supercapacitor performance is influenced by the efficiency of solar cells and storing and releasing capacity of supercapacitors. Any types of either solar section or supercapacitor sections could be used. In the DSSC solar cell, one of the influential variables is the performance of the photoanode. The photoanode with semiconducting metal oxides play a role in charges mobility and light absorption process, which are influenced by crystal morphology and structures. The common metal oxides used are ZnO and TiO2 which show high electron mobility, wide band gap, and good optical properties. This work is designed to investigate the effect of annealing temperature of the composite layer of ZnO and mesoporous TiO2 on structure, morphology, optical absorption, and photo-supercapacitor performance. The ZnO compact layer was deposited onto the FTO substrate by a spin coating method with various annealing temperature. The mesoporous TiO2 layer was deposited on top of the ZnO compact layer by means of screen printing method. The construction of photo-supercapacitor model comprises DSSC and BaTiO3-PVDF symmetric supercapacitor which integrated by using aluminum substrate. Characterization was done using XRD, SEM, UV-Vis, and I-V solar simulators for the performance of photo-supercapacitor.