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All Journal Buletin Poltanesa Bulletin of Engineering Science, Technology and Industry
Heryanto
Institut Teknologi PLN
Agriculture, Biological Sciences & Forestry Civil Engineering, Building, Construction & Architecture Computer Science & IT Education Electrical & Electronics Engineering Engineering

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Integrated Mobile Solar Cell-Based Nutrient Monitoring and Control System Eliza; Heryanto
Poltanesa Vol 26 No 2 (2025): December 2025
Publisher : P3KM Politeknik Pertanian Negeri Samarinda

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Abstract

The rapid advancement of digital technology and the Internet of Things (IoT) has transformed the agricultural sector by enabling higher efficiency, precision, and sustainability through automation, sensor integration, and renewable energy utilization. This study presents the development of a Green Smart Hydroponic system powered by an 800 Wp solar photovoltaic unit and equipped with IoT-based monitoring to strengthen renewable energy and green technology education at SMK Negeri 1 Majalaya. Using a systems engineering approach combined with experimental testing, the system integrates solar panels, an ESP32 microcontroller, sensors for pH, TDS, and temperature, and an automatic nutrient pump to maintain optimal growing conditions. Field testing demonstrated stable system performance, consistently maintaining ideal hydroponic parameters including pH (5.07), TDS (1071 ppm), and temperature (24.1°C). The IoT-based real-time dashboard enhanced user accessibility and improved project-based learning outcomes for students by allowing direct observation of data-driven plant management. Findings indicate that the integration of renewable energy and IoT not only supports efficient hydroponic operation but also promotes environmental awareness and technological competence among vocational students. This research highlights the system’s potential as an effective educational tool that other schools can adopt to improve teacher competency, foster student engagement in green technology, and support the broader implementation of sustainable smart agriculture practices.
TKDN SELF-ASSESSMENT OF REVERSE-ENGINEERED COAL PIPE FABRICATION AT PLN PUSHARLIS: A CASE STUDY Elviena Farizka; Muhamad Habibi; Heryanto
Bulletin of Engineering Science, Technology and Industry Vol. 4 No. 3 (2026): September - ON PROGESS
Publisher : PT. Radja Intercontinental Publishing

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Abstract

Dependence on imported spare parts in coal-fired power plants increases procurement cost and delivery time, while critical components such as the Coal Pipe are exposed to abrasive wear and elevated operating temperatures. This study evaluates the Domestic Component Level (Tingkat Komponen Dalam Negeri/TKDN) of an SS400 Coal Pipe fabricated by PLN Pusharlis through reverse engineering. A case-study self-assessment was conducted by integrating engineering documents, manufacturing flow, shop drawings, bill of materials, procurement realization, labor, and factory-overhead data with the cost-classification approach required by Indonesian Ministry of Industry Regulation No. 16/M-IND/PER/2/2011. The fabrication approach references ASTM G65 for abrasion-related material considerations and ASME Section IX for welding qualification. The detailed production-cost structure totals IDR 39,571,487.44, consisting of IDR 24,551,412.26 domestic components and IDR 15,020,075.18 foreign components, resulting in a TKDN value of 62.04%. The foreign share is concentrated mainly in primary raw materials, whereas direct labor, indirect labor, and most overhead are domestically sourced. The case demonstrates that reverse engineering can support import substitution while providing an auditable basis for domestic-content accountability
Co-Authors Eliza Elviena Farizka Muhamad Habibi