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All Journal Jurnal Sains Student Research Jurnal Ilmiah Nusantara
Roihan Parli Lubis
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Analisis Respons Transien Motor DC terhadap Perubahan Beban Menggunakan Kontrol PI Michael Oklando Sihotang; Takwa Padang; Roihan Parli Lubis; 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.v3i1.7422

Abstract

. This study analyzes the transient response of a DC motor to load variations using a Proportional-Integral (PI) controller implemented through MATLAB/Simulink simulation. The DC motor is modeled using a transfer function and tested under three conditions: without controller, with PI controller tuned by PID Tune (PI1 and PI2), and with a step load disturbance applied at seconds. Performance is evaluated based on rise time, peak time, overshoot, settling time, steady-state error, and recovery time. The results show that the system without control is highly sensitive to load changes, exhibiting a large steady-state error and a significant speed drop. The application of PI control improves system stability and accuracy; PI1 reduces the steady-state error to 1.65% (no-load) and 2.71% (with load) with minimal overshoot, while PI2 provides faster response with very low steady-state error (0.28% no-load and 0.27% with load) at the expense of slightly higher overshoot. Overall, PID Tune is effective in generating stable PI parameters, where PI2 achieves the best performance in response speed and accuracy, and PI1 is more favorable in minimizing overshoot.
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
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.
Co-Authors Arwadi Sinuraya Dian Putra Saragi Eka Dodi Suryanto Michael Oklando Sihotang Muhammad Ikbal Rianda Sapitra Lubis SINAGA, DESMAN JONTO Takwa Padang