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All Journal Jurnal Sains Student Research Jurnal Ilmiah Nusantara
Muhammad Ikbal
Universitas Negeri Medan
Computer Science & IT Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Languange, Linguistic, Communication & Media Social Sciences Other

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PERANCANGAN SISTEM SMART ATTENDANCE DAN MONITORING RUANGAN KELAS BERBASIS ESP32 Roihan Parli Lubis; Rianda Sapitra Lubis; Muhammad Ikbal; Dian Putra Saragi; Eka Dodi Suryanto
JOURNAL SAINS STUDENT RESEARCH Vol. 4 No. 2 (2026): April: Jurnal Sains Student Research
Publisher : CV. KAMPUS AKADEMIK PUBLISING

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61722/jssr.v4i2.9460

Abstract

The rapid development of Internet of Things (IoT) and embedded systems has significantly transformed conventional manual systems into automated and integrated solutions. One of the critical applications is in attendance systems and environmental monitoring, which are still commonly implemented manually and prone to errors, data manipulation, and inefficiency. This study aims to design and implement a smart attendance system integrated with classroom environmental monitoring using the ESP32 microcontroller. The system utilizes an RFID RC522 module for user identification, a DHT11 sensor for temperature and humidity monitoring, a PIR sensor for motion detection, and an LDR sensor for light intensity measurement. The collected data are processed by the ESP32 and displayed in real-time through a 16×2 LCD interface, while actuators such as a DC fan, buzzer, and LED indicators respond automatically based on system conditions. The research methodology includes hardware and software design, system integration, and performance testing. A threshold-based control algorithm with hysteresis is implemented to ensure stable fan operation and avoid frequent switching. Experimental results indicate that the system successfully performs accurate RFID-based attendance recording, real-time environmental monitoring, and automatic fan control when the temperature exceeds the defined threshold. The integration of multiple sensors enhances system functionality and improves energy efficiency. Therefore, the proposed system can be considered a reliable prototype for smart classroom applications that combines attendance automation and environmental control in a single platform.
STUDI STARTING DAN RESISTANSI STATOR TERHADAP SLIP, ARUS AWAL, DAN KUALITAS DAYA MOTOR INDUKSI Irenius Aditya Lumbangaol; Andira; Muhammad Ikbal; Desman Jonto Sinaga; Arwadi Sinuraya
JURNAL ILMIAH NUSANTARA Vol. 3 No. 1 (2026): Jurnal Ilmiah Nusantara Januari 2026
Publisher : CV. KAMPUS AKADEMIK PUBLISING

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61722/jinu.v3i1.7519

Abstract

This study presents a literature review on the influence of starting methods and stator resistance on slip characteristics, inrush current, and power quality performance of three-phase induction motors. Several starting strategies including direct-on-line (DOL), star–delta, autotransformer, soft-starter, and voltage–frequency (V/f) control using inverter-based drives are reviewed to evaluate their effect on initial current surge and electromagnetic torque development. Findings indicate that conventional starting methods such as DOL produce high inrush current and voltage sag, while soft-starter and inverter-based methods provide smoother torque transition and reduced starting current. Variation of stator resistance demonstrates a proportional effect on slip characteristics and torque, where higher resistance increases slip and reduces starting efficiency. In addition, starting methods may influence power quality parameters such as harmonic distortion, power factor, and voltage drop depending on the applied control strategy. The study concludes that integrating appropriate starting control with stator resistance adjustments can improve dynamic performance of induction motors and reduce power disturbances in industrial systems.
Co-Authors Andira Arwadi Sinuraya Desman Jonto Sinaga Eka Dodi Suryanto Irenius Aditya Lumbangaol Rianda Sapitra Lubis Roihan Parli Lubis Saragi, Dian Putra