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All Journal Jurnal Teknik Elektro Universitas Tanjungpura ELKHA : Jurnal Teknik Elektro Jurnal Edukasi dan Penelitian Informatika (JEPIN) Jurnal Teknik Elektro dan Komputasi (ELKOM) Action Research Literate (ARL) JUSTIN (Jurnal Sistem dan Teknologi Informasi) Telecommunications, Computers, and Electricals Engineering Journal Journal of Electrical Engineering, Energy, and Information Technology
Elang Derdian Marindani
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Computer Science & IT Control & Systems Engineering Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Mathematics Mechanical Engineering Social Sciences

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Sistem Monitoring Hidroponik Pada Tanaman Pakcoy Dengan Metode Nutrient Film Technique (Nft) Berbasis Internet Of Things Huda, Zikril; Marindani, Elang Derdian; Bomo Wibowo Sanjaya
Action Research Literate Vol. 9 No. 10 (2025): Action Research Literate
Publisher : Ridwan Institute

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.46799/arl.v9i10.3035

Abstract

This research develops and implements an Internet of Things (IoT)-based hydroponic system designed to automatically monitor and control nutrient quality to ensure optimal plant growth. The system is capable of monitoring crucial parameters such as pH, Total Dissolved Solids (TDS), water temperature, ambient temperature, and ambient humidity, and possesses the capability to control pH and TDS levels in the nutrient solution. The implementation was conducted on pakcoy cultivation using the Nutrient Film Technique (NFT) hydroponic method, chosen for its suitability with IoT integration. The platform utilized is a website connected to a Firebase Database, where sensor data is processed by a microcontroller and transmitted to the database for real-time display. Testing results indicate sensor error percentages of 1.53% for water temperature, 6.31% for pH, 9.17% for TDS, 2.17% for ambient temperature, and 1.25% for ambient humidity. Overall, the sensor readings used in this system demonstrate satisfactory performance in measuring water quality and environmental parameters, thereby effectively supporting plant quality maintenance.
DESIGN OF ACTIVE ANALOG SUBWOOFER CROSSOVER FILTER LINKWITZ RILEY 24 IN AUDIO SYSTEM Hizkia, Dave Adonia; Suryadi, Dedy; Marindani, Elang Derdian
Telecommunications, Computers, and Electricals Engineering Journal (TELECTRICAL) Vol 3, No 2: October 2025
Publisher : Faculty of Engineering, Universitas Tanjungpura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26418/telectrical.v3i2.97440

Abstract

The quality of an audio system is greatly influenced by the accuracy of frequency distribution, especially in the low-frequency range managed by the subwoofer. To achieve optimal separation, this study presents the design and implementation of a fourth-order active analog Linkwitz–Riley crossover filter (LR24) for subwoofer applications. The LR24 topology was selected for its ability to provide smooth and symmetrical frequency transitions with a 24 dB/octave slope. The research covers filter and preamplifier design, component selection, and performance evaluation using pink noise. Measurements were carried out through spectrogram analysis, frequency spectrum observation, and oscilloscope testing. The resulting filter achieved a cutoff frequency of 126.8 Hz with an attenuation slope of 24 dB/octave at 249.4 Hz, effectively reducing high-frequency signals. Comparative analysis with fourth-order digital Butterworth and Bessel filters on the DBx 260 demonstrated that the proposed analog design delivers competitive performance. This work highlights that an analog LR24 filter built from basic components and general-purpose op-amps can serve as a reliable and cost-effective alternative to digital solutions in low-frequency audio processing, although its performance is still constrained by the limitations of standard op-amps compared to audio-grade devices.
Co-Authors Ade Elbani Adiguna, Muhamad Gilang Satria Ahmad Safarudin Ahmad Safarudin Aprilio Givano Arif Rohman Hakim Avianto, Yudi Azka, Achmad Rafiqi Azka, Achmad Rafiqi Bomo Wibowo Sanjaya Dedy Suryadi Dedy Suryadi Desyandri Desyandri Dewi, Suti Kurnia Eko Jatmiko F Trias Pontia Fitri Imansyah Hadary, Ferry Hadary, Ferry Hafiz Muhardi Hendro Priyatman Hendro Priyatman, Hendro Herry Sujaini Hidayatullah, Bagus Arif Hizkia, Dave Adonia Huda, Zikril Ikhwan, Sulthonik Infantri, Sasis Dedi Jannus Marpaung Jati, Dian Rahayu Jatmiko, Eko Kamel, Ahmad Kornelius Raya Frayos Kusumawardhani, Eka Muhammad Angga Muhammad Saleh Muhammad Saleh Nur Qumarni Pontia W, F. Trias Pradhesta, Lena Endriana Prayudi, Ari Putra, Rasmi Gumilang Redi Ratiandi Yacoub Rudy Dwi Nyoto, Rudy Dwi Sanjaya, Bomo Wibowo Sasis Dedi Infantri Seno Darmawan Panjaitan Seno Darmawan Panjaitan Setiawan, Septian Suyudi, - Tri Wahyudi W, F. Trias Pontia Yudi Avianto Zumiat, -