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All Journal International Journal of Applied Power Engineering (IJAPE) Integrated Science Education Journal Journal of Creative Student Research
Tindyo Prasetyo
Universitas Muhammadiyah Surakarta
Humanities Decision Sciences, Operations Research & Management Education Electrical & Electronics Engineering Languange, Linguistic, Communication & Media Social Sciences Transportation

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Hydroelectric power generator using vertical axis turbine with adaptive blades Rizki Nurilyas Ahmad; Soraya Komala Firdaus; Mohammad Nasrul Mubin; Hasyim Asy'ari; Tindyo Prasetyo; Iqbal Reza Pradana
International Journal of Applied Power Engineering (IJAPE) Vol 15, No 2: June 2026
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijape.v15.i2.pp636-645

Abstract

The implementation of micro-hydro power plants (MHPPs) offers a strategic solution for achieving energy independence, particularly within remote communities. This study proposes the development of a hydroelectric power generator with a vertical axis turbine, designed not only as a source of clean energy but also to minimize visual pollution. The system maximizes submerged components, thereby reducing its visual impact. Although MHPPs technology is widely applied to address electrification challenges in remote areas, the system proposed in this study, with its components predominantly submerged below the water surface, offers a visually unobtrusive solution that is also well-suited for urban environments. However, conventional locked-blade turbines often experience significant efficiency losses due to counter-flow pressure acting on blades moving against the water stream, highlighting the need for an adaptive mechanism to minimize drag and optimize energy capture. The hydroelectric power generator using vertical axis turbine with adaptive blades consistently demonstrated better performance than a system using locked blades. The adaptive-blade configuration outperformed the locked-blade system, exhibiting a 5.1% increase in average turbine efficiency and a 3.5% improvement in overall system efficiency.
Analysis of the TDS Sensor Reading Accuracy Between Arduino Uno and ESP32 Microcontrollers for Water Clarity Measurement Abdul Rahman; Tindyo Prasetyo
Integrated Science Education Journal Vol 7 No 4 (2026): July
Publisher : Cahaya Ilmu Cendekia Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37251/isej.v7i4.3531

Abstract

Purpose of the study: This study aims to evaluate and compare the reading accuracy of a TDS sensor when interfaced with Arduino UNO and ESP32 microcontrollers, specifically in the context of water clarity measurement applications, by assessing voltage reading precision, data acquisition stability, and measurement consistency across varying dissolved solids concentrations. Methodology: Hardware used includes a TDS sensor, Arduino UNO (ATmega328P, 10-bit ADC), ESP32 NodeMCU (12-bit ADC), and a calibrated TDS meter as the reference instrument. The study employs the Waterfall methodology with direct laboratory observation, potentiometer testing, and voltage measurement across water samples at concentrations of 101, 201, 300, 406, and 515 PPM, each repeated three times at room temperature (~20–21°C). Main Findings: Arduino UNO demonstrated superior accuracy with average voltage errors ranging from 0.21% to 2.12% across all TDS concentrations, compared to ESP32's errors of 13.1% to 54.32%. The ESP32 critically misread a 101 PPM water sample as 48 PPM, yielding a 54.32% error — a failure that would result in a misclassification of water clarity category. Arduino UNO's standard deviation was 0.064 ADC versus ESP32's 2.019 ADC, confirming 31.5 times greater measurement stability. Novelty/Originality of this study: This study offers a direct, multi-parameter comparison of Arduino UNO and ESP32 specifically for TDS-based water clarity measurement, exposing a critical non-linearity flaw in the ESP32's ADC performance at low-voltage ranges (<10% Vref) that has not been previously documented in this application context.
Asesmen Kinerja Sistem Pembangkit Solar Fotovoltaik Terintegrasi Jala Jala 3 Fasa Arafi Adi Mussalam; Tindyo Prasetyo
Journal of Creative Student Research Vol. 4 No. 3 (2026): Juni : Journal of Creative Student Research
Publisher : Lembaga Pengembangan Kinerja Dosen

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55606/jcsr-politama.v4i3.6358

Abstract

This study aims to analyze the performance of a three-phase grid-connected solar photovoltaic (PV) power system with a capacity of 8.72 kWp installed at MA Darul Ihsan Muhammadiyah, Sragen, Central Java, Indonesia. The system comprises 16 monocrystalline modules (545 Wp each, configured in 2 strings × 8 series) connected to a 10 kW Sungrow string inverter. Data were collected over one month (April) using a quantitative-experimental method, covering solar irradiance, module temperature, DC input power, AC output power, system efficiency, daily energy production, and load sharing between the PV system and the PLN utility grid. Results show a peak irradiance of 730 W/m², a maximum output power of 6,050 W, and a mean system efficiency of 94.32%. Total energy production in April reached 1,096.5 kWh (average 36.55 kWh/day), with a Performance Ratio (PR) of 83.22%, classified as good performance under IEC 61724. Load sharing analysis indicates that the PV system contributed 22.28% while the utility grid supplied 77.72% of the total building consumption of 4,920.5 kWh. This study confirms that grid-connected PV integration in educational facilities is technically viable and capable of reducing grid energy consumption by approximately one-fifth of total building energy demand.
Co-Authors Abdul Rahman Arafi Adi Mussalam Hasyim Asyari Iqbal Reza Pradana Mohammad Nasrul Mubin Rizki Nurilyas Ahmad Soraya Komala Firdaus