Articles
<![CDATA[Preparation and Analysis of Dual-Property Coated Metal Foams for Potential Wick Structures in Heat Pipe Applications ]]>
<![CDATA[Bonardo, Doli]]>;
<![CDATA[Hollanda Arief Kusuma]]>;
<![CDATA[Muhammad Tanveer]]>;
<![CDATA[Dharma, Budi]]>;
<![CDATA[Amri, Fauzan]]>
<![CDATA[ EKSAKTA: Berkala Ilmiah Bidang MIPA Vol. 26 No. 01 (2025): Eksakta : Berkala Ilmiah Bidang MIPA (E-ISSN : 2549-7464) ]]>
Publisher : <![CDATA[Faculty of Mathematics and Natural Sciences (FMIPA), Universitas Negeri Padang, Indonesia ]]>
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DOI: 10.24036/eksakta/vol26-iss01/530
<![CDATA[Hydrophilic and hydrophobic coated metal foams have been successfully prepared via a cleaning procedure and a simple spraying technique to be used as a wick structure in a heat pipe. The main object of this work is to explore the effect of hydrophilic and hydrophobic layers on the metal foam and to study the properties of the metal foams. To achieve this goal, 3D-OM analyses were performed to identify the pore size of the metal foam. To observe the surface morphology and porosity of the metal foam, SEM analysis was carried out and succeeded in observing the changes in the surface roughness of the hydrophilic and hydrophobic coated metal foams. The pore diameter, porosity and density of metal foam were 633.38 µm, 48.46% and 4.62 g/cm3, respectively. FT-IR analysis was also performed with the results showing that the hydrophobic coating did not affect the overall molecular group composition. Contact angle analysis shown that the values were 74° and 112° (first day) on the hydrophilic and hydrophobic coated samples.]]>
<![CDATA[Evaluation of Coordinate Position Precision Using GNSS NEO SERIES and GSM SIM 7000E Modules ]]>
<![CDATA[Kusuma, Hollanda Arief]]>;
<![CDATA[Irnawati, Yunita]]>;
<![CDATA[Aflaha, Fadli Aulia]]>;
<![CDATA[Baihaque, Muhd. Ridho]]>
<![CDATA[ Journal of Applied Geospatial Information Vol. 8 No. 2 (2024): Journal of Applied Geospatial Information (JAGI) ]]>
Publisher : <![CDATA[Politeknik Negeri Batam ]]>
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DOI: 10.30871/jagi.v8i2.7780
<![CDATA[This study investigates the precision of coordinate positioning using Global Navigation Satellite System (GNSS) technology, focusing on GNSS Neo Series modules and the GSM SIM 7000E module. The research aims to address the lack of comparative studies evaluating these GNSS receivers simultaneously. A field test spanning 24 hours was conducted to collect data on satellite acquisition and Horizontal Dilution of Precision (HDOP). The GNSS systems were deployed in a controlled environment at the Class I Meteorological Station Hang Nadim, Batam. The system developed comprised GNSS modules (Neo 6M, Neo 7M, Neo 8M, and GSM SIM 7000E), an ESP32 microcontroller, Arduino UNO, and a Micro SD shield module. Data processing involved converting coordinates to meters and calculating longitude and latitude errors. Root Mean Square Error (RMSE) analysis and one-way ANOVA were performed to assess accuracy and compare the GNSS receivers. Results indicate that the GSM SIM 7000E demonstrated superior satellite acquisition, leading to higher accuracy in coordinate positioning compared to the Neo Series modules. The study also identified optimal data collection times for accurate dispersion. These findings provide valuable insights into selecting and deploying GNSS receivers, enhancing performance in location-based services and scientific applications.]]>
<![CDATA[Comparation Tidal Harmonic Based on IoT Instrument Using Admiralty Method in Tanjungpinang Waters ]]>
<![CDATA[Alajuri, M Hasbi Sidqi]]>;
<![CDATA[Kusuma, Hollanda Arief]]>;
<![CDATA[Suhendra, Tonny]]>;
<![CDATA[Setyono, Dwi Eny Djoko]]>
<![CDATA[ Journal of Applied Geospatial Information Vol. 8 No. 2 (2024): Journal of Applied Geospatial Information (JAGI) ]]>
Publisher : <![CDATA[Politeknik Negeri Batam ]]>
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DOI: 10.30871/jagi.v8i2.9042
<![CDATA[Tides are the rising and falling movement of sea level caused by the gravitational force of celestial bodies such as the moon and sun on the mass of seawater on earth. The aim of this research is to compare the use of time series of harmonic constant parameters obtained from tidal data stored in the tool using the admiralty method. Research activities were carried out at the international port of Dompak Island, Tanjungpinang City, Riau Islands. This tidal data is analyzed by admiralty. This method is used to analyze harmonic constants and identify patterns and sea level levels. Based on the results obtained, the type of tide in Tanjungpinang waters is a mixed tide (single dominant) with an F value of 2.01 to 2.07. The sea level elevation values "‹"‹obtained (MSL) from each time series ranged from 75.83 cm to 76.60 cm, (MHWL) ranged from 97.17 cm to 98.24 cm. Then (MLWL) ranges from 58.77 cm to 59.39 cm. Meanwhile, (HHWL) ranges from 153.98 cm to 154.73 cm, and (LLWL) ranges from -2.77 cm to -1.96 cm. With a confidence interval of 5 percent, is obtained. The difference in each time series seen from the data (MSL) is 7cm. Therefore, Tidal data from each time series has no significant differences.]]>
<![CDATA[Spectral Characterization in Seaweed, Kappaphycus alvarezii, using AS7285x Spectroscopy Sensor Device ]]>
<![CDATA[Kusuma, Hollanda Arief]]>;
<![CDATA[Suhendra, Tonny]]>;
<![CDATA[Ilhamdy, Aidil Fadli]]>;
<![CDATA[Ilhami, Carel Candigia Sahid]]>;
<![CDATA[Setyono, Dwi Eny Djoko]]>;
<![CDATA[Lubis, Muhammad Zainuddin]]>
<![CDATA[ ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 30, No 2 (2025): Ilmu Kelautan ]]>
Publisher : <![CDATA[Marine Science Department Diponegoro University ]]>
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DOI: 10.14710/ik.ijms.30.2.183-191
<![CDATA[This study explores the spectral characterization of seaweed, Kappaphycus alvarezii, using the SparkFun Triad Spectroscopy Sensor AS7265x to assess the relationship between water content and light intensity. This research aims to provide a foundation for non-destructive monitoring of post-harvest seaweed quality using spectral techniques. The SeaSpec device was constructed using an ESP32 microcontroller, a TFT display, and the AS7265x sensor. Seaweed samples were collected from the coastal area of Karimun Islands and subjected to a controlled drying process at 40°C to determine the water content in the seaweed. The spectral data were recorded across 18 channels in the visible and infrared spectra, highlighting distinct patterns that correlate with varying moisture levels. A multiple linear regression analysis was employed to determine the contributions of individual spectral channels to water content prediction, revealing that each channel has its own unique contribution to the model. Coefficient of determination (R²), percentage error (%), and percentage accuracy (%) were also used to assess model performance. The results indicated that higher water content corresponds to increased light intensity. The analysis indicated that the visible spectrum outperformed the infrared spectrum in predictive accuracy, with an R² value of 0.79 compared to 0.61 for the infrared spectrum. This indicates that the visible light spectrum is more effective in predicting water content in K. alvarezii. The findings underscore the potential of spectral analysis as a reliable method for assessing the physico-chemical properties of seaweeds, advancing the use of optical sensors in aquaculture and environmental monitoring while paving the way for future research.]]>
<![CDATA[Design of Time Out Devices for Amateur Volleyball Games Using ESP32 Microcontroller ]]>
<![CDATA[Bonardo, Doli]]>;
<![CDATA[Kusuma, Hollanda Arief]]>;
<![CDATA[Hofur, Viki Dima]]>;
<![CDATA[Yunianto, Anton Hekso]]>
<![CDATA[ SITEKIN: Jurnal Sains, Teknologi dan Industri Vol 22, No 2 (2025): June 2025 ]]>
Publisher : <![CDATA[Fakultas Sains dan Teknologi Universitas Islam Negeri Sultan Syarif Kasim Riau ]]>
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DOI: 10.24014/sitekin.v22i2.36169
<![CDATA[This study presents the development of a wireless time-out device for amateur volleyball games, utilizing ESP32 microcontrollers and ESP-NOW communication. The device aims to improve the efficiency and accuracy of time-out requests, eliminating delays caused by traditional manual signaling. The functional and field tests confirmed that the device enables seamless communication between coaches and referees, ensuring that time-out requests are processed promptly. Performance evaluations included TFT display readability, push button responsiveness, and communication stability over different distances. The TFT screen demonstrated clear visibility at night but faced readability issues under direct sunlight, suggesting the need for brightness optimization. The distance test showed reliable ESP-NOW communication within a 20-100 meter range, with signal degradation and packet loss beyond this threshold. These findings emphasize the importance of optimizing system placement and display readability to enhance usability in various match conditions. This research provides a practical, cost-effective solution for time-out management in volleyball games. Future improvements may include real-time game analytics, mobile app connectivity, and expanded application to other sports. By addressing key challenges in referee-coach communication, this device contributes to the advancement of sports officiating technology.]]>
<![CDATA[A Smart Web Application for Real-Time Indoor Temperature and Humidity Monitoring ]]>
<![CDATA[Hasbi, M. Hasbi Sidqi Alajuri]]>;
<![CDATA[Hollanda Arief Kusuma]]>;
<![CDATA[Marisha Pertiwi]]>;
<![CDATA[Tonny Suhendra]]>;
<![CDATA[Gilang Satria Wahyu Dewantara]]>
<![CDATA[ EKSAKTA: Berkala Ilmiah Bidang MIPA Vol. 26 No. 03 (2025): Eksakta : Berkala Ilmiah Bidang MIPA (E-ISSN : 2549-7464) ]]>
Publisher : <![CDATA[Faculty of Mathematics and Natural Sciences (FMIPA), Universitas Negeri Padang, Indonesia ]]>
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DOI: 10.24036/eksakta/vol26-iss03/606
<![CDATA[Learning comfort is influenced by the environment, including temperature and humidity. This study validates the temperature and humidity monitoring device (DHT 22) in the dashboard system of the Department of Electrical Engineering. The results show high accuracy, with 98.96% for temperature and 98.93% for humidity, and an average error rate of 1.04%. Validation was conducted at BMKG Tanjungpinang for four days, with data recorded every minute for 24 hours. User satisfaction evaluation using the System Usability Scale (SUS) yielded an average score of 57, categorized as "Not Acceptable." Nevertheless, users still provided relatively positive feedback. These findings emphasize the need for improvements in dashboard design, user experience, and additional training. Recommendations include utilizing third-party platforms and evaluating the hardware and interface to enhance system usability.]]>
<![CDATA[Development of an IoT-Based Tidal Gauge With Ultrasonic Sensors ]]>
<![CDATA[Alajuri, M Hasbi Sidqi]]>;
<![CDATA[Kusuma, Hollanda Arief]]>;
<![CDATA[Bavitra, Bavitra]]>;
<![CDATA[Harahap, Basyaruddin Ismail]]>
<![CDATA[ Jambura Journal of Electrical and Electronics Engineering Vol 7, No 2 (2025): Juli - Desember 2025 ]]>
Publisher : <![CDATA[Electrical Engineering Department Faculty of Engineering State University of Gorontalo ]]>
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DOI: 10.37905/jjeee.v7i2.29143
<![CDATA[Tides are the periodic rise and fall of sea levels caused by the gravitational effects of the moon and the sun. This tidal phenomenon can be measured manually or automatically using instruments. The objective of this study is to design and develop a tide gauge instrument using the JSN-SR04T sensor based on the Internet of Things (IoT). The research method includes hardware design, electrical design, firmware development, and dashboard creation. Once the system design is completed, the components are assembled. Functional and laboratory tests are conducted to ensure that each component operates properly, followed by field testing. The tide gauge instrument is capable of operating for 7 days with good accuracy in the measurement range of 25 cm to 200 cm (with an error between 0.02 and 0.16 cm). Field observations indicate that the type of tide corresponds to previous studies, which is a mixed tide. The DS18B20 sensor produced temperature readings that matched those of a standard thermometer.Pasang surut merupakan gerak naik turun muka air laut secara periodik yang disebabkan oleh efek gravitasi bulan dan matahari. Fenomena pasang surut ini bisa diukur secara manual dan otomatis menggunakan instrumen. Tujuan penelitian ini yaitu membuat rancang bangun instrumen pengukur pasang surut dengan sensor JSN-SR04T berbasis IoT. Metode penelitian dimulai dari perancangan hardware, perancangan electrical, perancangan firmware, dan perancangan dashboard. Setelah perancangan sistem selesai maka dilakukan perakitan komponen. Uji fungsionalitas dan uji laboratorium dilakukan untuk memastikan setiap komponen berfungsi dengan baik. selanjutnya, diakukan uji lapangan. Instrumen pasang surut ini dapat bekerja selama 7 hari dengan akurasi yang baik pada rentang pengukuran 25 cm hingga 200 cm (Error 0.02 hingga 0.16). Berdasarkan hasil pengamatan di lapangan menunjukkan bahwa jenis pasang surut sesuai dengan peneliti sebelumnya yaitu campuran. Hasil pengukuran sensor DS18B20 memiliki nilai suhu yang sama dengan pengukuran termometer. ]]>
<![CDATA[Testing the Range and Analysis of WSN LoRa Sx1278 Parameters in Coastal Areas ]]>
<![CDATA[Kusuma, Hollanda Arief]]>;
<![CDATA[Hanafi, M Fadzil]]>;
<![CDATA[Suhendra, Tonny]]>;
<![CDATA[Oktaviani, Nadya]]>
<![CDATA[ TELKA - Telekomunikasi Elektronika Komputasi dan Kontrol Vol 10, No 2 (2024): TELKA ]]>
Publisher : <![CDATA[Jurusan Teknik Elektro UIN Sunan Gunung Djati Bandung ]]>
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DOI: 10.15575/telka.v10n2.168-177
<![CDATA[This research discusses the testing of the range and analysis of other parameters of Wireless Sensor Network (WSN) technology using LoRa technology at 433 MHz frequency in coastal areas. This study aims to provide important information for the development of WSN and LoRa technology, especially in coastal areas. The research method used is the design of the device, the creation of transmitter and receiver firmware, and field testing using the continuous method in Teluk Sebong, Berakit on May 26, 2022. The results showed that the maximum range achieved by the receiver was 7.3 km with a packet loss of 56.84%. Data transmission using LoRa experienced a significant delay, especially at a range of 4.2 km with a delay time of up to 18 seconds. In addition, the study also analyzed the LoRa network performance, such as the map of measurement and data loss points, the distribution of RSSI values, and the distribution of SNR values divided into several distance ranges. This research is expected to provide important information for the development of WSN and LoRa technology, especially in coastal areas]]>
<![CDATA[Rancang Bangun Perangkat Akuisisi Data Gas Emisi Karbon Monoksida Pada Kendaraan Sepeda Motor ]]>
<![CDATA[Saputra, Irwan]]>;
<![CDATA[Suhendra, Tonny]]>;
<![CDATA[Arief Kusuma, Hollanda]]>
<![CDATA[ Sustainable Vol 12 No 1 (2023): Jurnal Sustainable : Jurnal Hasil Penelitian dan Industri Terapan ]]>
Publisher : <![CDATA[Fakultas Teknik Universitas Maritim Raja Ali Haji ]]>
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DOI: 10.31629/sustainable.v12i1.5244
<![CDATA[Exhaust emissions can cause air pollution. Carbon monoxide is one of the air pollution comes from motor vehicle gas emissions. From current technological developments, low-cost gas sensors have been widely used. In research, data acquisition devices have been successfully developed using the MQ-7 sensor, ESP32, micro SD card, TFT display, and keypad. The results of the sensor calibration get 10 motorcycle data with a coefficient of determination (R2) of 0.9273 with a percentage of 92.73%. The average accuracy of the MQ-7 sensor is 91.23% with an error percentage of 1.82% and an RMSE of 0.379. From the results of the sensor calibration, it can be seen that the MQ-7 sensor has a fairly good level of accuracy. From field test, 30 motorcycles has been test. From the results of the field test of 30 motorcycles, factors that affect the value of carbon monoxide gas in motorcycles include dirty air filters, fuel used, and motorbike maintenance. As for the year of the vehicle does not affect the value of carbon monoxide gas.]]>
<![CDATA[Rancang Bangun Prototipe Kapal Katamaran Glass Bottom Ekowisata Laut ]]>
<![CDATA[Yunianto, Anton Hekso]]>;
<![CDATA[Kusuma, Hollanda Arief]]>
<![CDATA[ Sustainable Vol 12 No 1 (2023): Jurnal Sustainable : Jurnal Hasil Penelitian dan Industri Terapan ]]>
Publisher : <![CDATA[Fakultas Teknik Universitas Maritim Raja Ali Haji ]]>
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DOI: 10.31629/sustainable.v12i1.5540
<![CDATA[A glass-bottom catamaran is a vessel with two hulls with a layer of glass at the bottom of the boat, allowing passengers to view underwater scenery. This research focused on the planning stage in designing a prototype of a glass bottom catamaran, intending to determine the optimal main dimensions and produce a high-quality vessel. The results showed that determining the main dimensions of the prototype vessel is highly influenced by the aspect ratio, particularly the L/B ratio. This ratio is used as a reference in designing the prototype vessel as it affects vessel parameters such as resistance, maneuverability, and cost. Additionally, dividing the process of manufacturing the prototype vessel into several stages, including conceptual design, system design, structural design, steering system design, and electrical system design, is crucial to ensure the quality and safety of the prototype vessel. The visual depiction of the shape and characteristics of the glass bottom catamaran prototype indicates that the prototype vessel has two demi hulls and an asymmetrical hull shape..]]>
