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Journal : Jurnal Sains Teknologi dan Lingkungan (JSTL)

 1 
Rancang Bangun Sistem Kontrol dan Monitoring Tekanan Gas Pada Biodigester Berbasis IoT: Analisis Waktu dan Stabilitas Koneksi ESP32 dan ESP32-S3 (Lilygo T Display S3) Saputra, Oki; Khalil, Fakhrul Irfan; Widhiantari, Ida Ayu
JURNAL SAINS TEKNOLOGI & LINGKUNGAN Vol. 10 No. 4 (2024): JURNAL SAINS TEKNOLOGI & LINGKUNGAN
Publisher : LPPM Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jstl.v10i4.706

Abstract

This study explores the increasing demand for efficient gas pressure monitoring systems in biodigesters, which play a crucial role in renewable energy production. The primary objective of this research is to design and develop a control and monitoring system based on the Internet of Things (IoT) utilizing the ESP32 and ESP32-S3 (Lilygo T Display S3) microcontrollers. An analysis was conducted to assess the connection duration and stability of both microcontrollers, focusing on the time required to establish a WiFi connection and connect to the Arduino IoT Cloud. The results indicate that the ESP32 achieves an initial WiFi connection time of approximately 10 seconds, with total connection durations ranging from 1 minute 3 seconds to 1 minute 36 seconds, while the ESP32-S3 encounters challenges in maintaining stable connectivity, resulting in total connection times between 1 minute 7 seconds and 1 minute 21 seconds due to certificate validation issues. These findings underscore the importance of selecting the appropriate microcontroller to optimize IoT applications for gas pressure monitoring systems in biodigesters, providing insights for developers and researchers to enhance the efficiency and reliability of renewable energy technologies.
Analisis Kinerja Dome Solar Dryer Untuk Pengeringan Kopi Di Desa Karang Sidemen Kabupaten Lombok Tengah Ridho, Rosyid; Khalil, Fakhrul Irfan; Saputra, Oki; Widhiantari, Ida Ayu; Puspitasari, Isnaini; Zulfikar, Wahyudi; Antesty, Sella; Afriana, Tina; Anugerah, M. Titan; Yusuf, Ahmad Rahman
JURNAL SAINS TEKNOLOGI & LINGKUNGAN Vol. 11 No. 2 (2025): JURNAL SAINS TEKNOLOGI & LINGKUNGAN
Publisher : LPPM Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jstl.v11i2.735

Abstract

Coffee drying is a crucial stage that influences the final product's quality and flavor. This process must be performed correctly to maintain the quality of the coffee beans and prevent mold growth. This study aims to compare two coffee drying methods, using a Solar Dome Dryer and direct sun drying. The research was conducted in Karang Sidemen Village, Central Lombok, using 100 kg of coffee beans, divided into two groups of 50 kg each for the two drying methods. The results showed that both methods successfully reduced the moisture content to 0%, but the drying with the Solar Dome Dryer was faster (4,320 minutes) compared to direct sun drying (4,380 minutes). The Solar Dome Dryer maintained a more stable temperature (50-60°C) and produced a more consistent drying rate, making it more efficient in preserving the quality of the coffee beans and preventing microbial contamination. This study recommends the use of Solar Dome Dryer for coffee drying in areas with high humidity and variable weather conditions.
Rancang Bangun Sistem Pendingin Air Nutrisi Berbasis Peltier untuk Optimasi Pertumbuhan Tanaman Hidroponik Saputra, Oki; Abdullah, Sirajuddin H.; Sumarsono, Joko; Priyati, Asih; de Side, Gagassage Nanaluih; Putra, Guyup Mahardhian Dwi; Setiawati, Diah Ajeng; Amaliah, Wenny; Dewi, Endang Purnama; Nurrohman, Reza Kusuma; Zamzami, Muhammad Ilham; Sani, Nurwan
JURNAL SAINS TEKNOLOGI & LINGKUNGAN Vol. 11 No. 2 (2025): JURNAL SAINS TEKNOLOGI & LINGKUNGAN
Publisher : LPPM Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jstl.v11i2.856

Abstract

High ambient temperatures inside tropical greenhouses can significantly raise nutrient solution temperatures in vertical hydroponic systems, disrupting nutrient uptake and reducing plant productivity. This study focuses on the design and development of a nutrient cooling system (chiller) using two TEC1-12706 thermoelectric modules (Peltier) arranged in series to enhance heat dissipation performance. The nutrient solution is pumped from the reservoir to the cooling chamber using a 12 V DC pump and recirculated in a closed-loop configuration. The chiller system is fully automated, controlled by two DH48S digital timers operating simultaneously: one activates Peltier 1, while the other controls Peltier 2 via the NC output (5 minutes) and the pump via the NO output (30 seconds), enabling alternating programmed cooling and circulation. The entire chiller unit is active only from 08:00 to 18:00 WITA using a KG316T programmable timer, corresponding to peak thermal stress hours inside the greenhouse. Results showed that despite greenhouse temperatures reaching up to 39.4 °C with relative humidity dropping to 47.6%, the chiller system maintained nutrient solution temperatures within the optimal 27–30 °C range. This design proved effective in reducing and stabilizing nutrient temperature under high heat microclimates. With its simple, automated, and energy-efficient architecture, the chiller system offers a promising solution for small-scale vertical hydroponics and greenhouse-based urban farming in tropical regions.
Co-Authors Abdullah, Sirajuddin H. Afriana, Tina Amaliah, Wenny Amaliyah, Wenny Amaro, Moegiratul Amuddin Anggraini, Ines Marisya Dwi Anjelina, Ranti Ayu Antesty, Sella Anugerah, M. Titan Aries Saifudin Aristantia, Lisa Asih Priyati Baiq Rien Handayani, Baiq Rien Bambang Edison Begauvic, Eza Helyatha Cicilia, Siska De Side, Gagassage Nanaluih Dewi, Endang Purnama Diah Ajeng Setiawati, Diah Ajeng Dody Handito, Dody Dwiningsih, Eka Eko Fadilah, Muhamad Ilham Fakhrul Irfan Khalil Fuadi, Mi’raj Guyup Mahardhian Dwi Putra Haniah, Umi Joko Sumarsono Kurnia, Erlin Ady Kusuma Nurrohman, Reza Mardatillah, Sindi Mita Sari Ningsih Mi’raj Fuadi Murni, Esti Yustika Mutia Devi Ariyana, Mutia Devi Nehru Nehru Novitasari, Fitri Nurul Aen Paulia, Eliva Pawestri, Setyaning Perdana, Firman Fajar Perdhana, Firman Fajar Pertiwi, Made Gendis Putri Puspitasari, Isnaini Putri Sartika Putri Suryandari Qabul Dinanta Utama Raisa Amini Rasyda, Riezka Zuhriatika Reza Kusuma Nurrohman Rini Nofrida Rismalinda Rosyid Ridho S., Ince Siti Wardatullatifah Sani, Nurwan Sari, Ira Musfita Sirajuddin H. Abdullah, Sirajuddin SRI KURNIASIH Susnita, Yepi Syukron, Muhammad Unsunnidhal, Lalu Wahyudi Wahyudi Wahyudi Zulfikar Wardatullatifah , Ince Siti Wardatullatifah S., Ince Siti Widhiantari, Ida Ayu Yasa, I Wayan Sweca Yenasari, Sri Yesica Marcelina Romauli Sinaga Yusuf, Ahmad Rahman Zainuri Zamzami, Muhammad Ilham Zulfikar, Wahyudi