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Program Studi Teknik Elektro Fakultas Teknik, Universitas Udayana Jl. Kampus Bukit Jimbaran
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INDONESIA
Jurnal SPEKTRUM
Published by Universitas Udayana
ISSN : 23023163     EISSN : 26849186     DOI : https://doi.org/10.24843/SPEKTRUM
Core Subject : Science, Engineering,
Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Energy Engineering
Jurnal SPEKTRUM is peer review journal, published four times a year by the Department of Electrical Engineering, Faculty of Engineering, Universitas Udayana. This journal discusses the scientific works containing results of research in the field of electrical, include: power systems, telecommunications, computers, informatics, controls, and electronics. Authors are expected to include original scientific papers in accordance with the scope of the discussion of this journal including all aspects of the theory and practice are used.
Arjuna Subject : Teknik (semua kategori) - Teknik Listrik dan Elektro
Articles 25 Documents
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Search results for , issue "Vol. 12 No. 3 (2025): Jurnal SPEKTRUM" : 25 Documents clear
IMPLEMENTASI SISTEM KONTROL OTOMATIS PADA PROTOTIPE ALAT PENERANGAN JALAN BERBASIS INTERNET OF THINGS SEBAGAI UPAYA EFISIENSI ENERGI DI JALAN BUKIT DHARMA RAYA JIMBARAN I N. B. T. Putra; C. G. I. Partha; I W. Sukerayasa
Jurnal SPEKTRUM Vol. 12 No. 3 (2025): Jurnal SPEKTRUM
Publisher : Program Studi Teknik Elektro UNUD

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/SPEKTRUM.2025.v12.i03.p1

Abstract

The implementation of an AC Light Dimmer and Relay 2 Channel as an automatic lamp control system on a Street Lighting (APJ) prototype based on the Internet of Things (IoT) is used to support energy efficiency on Jalan Bukit Dharma Raya Jimbaran. This system is designed to automatically adjust light intensity based on time and the presence of road users detected by an ultrasonic sensor. Monitoring and control are performed in real-time via the Telegram platform, with energy consumption monitored using the PZEM-004T module. The prototype is built using an ESP32 microcontroller, which controls the lamp activation, brightness through the AC Light Dimmer, and ON/OFF status via the Relay 2 Channel. Test results show that the system can improve energy efficiency by up to 43.75% and save electricity costs by Rp132.56 during 2 hours of operation. This system implementation has proven to be effective, adaptive to environmental conditions, and supports the application of intelligent and energy-efficient street lighting systems.
IMPLEMENTASI API TELEGRAM SEBAGAI ANTARMUKA MANUSIA-MESIN UNTUK SISTEM MONITORING DAN NOTIFIKASI KONDISI REAL-TIME INFRASTRUKTUR PUBLIK Joni Wijaya Fathoni; Ngurah Indra ER; I Wayan Sukerayasa
Jurnal SPEKTRUM Vol. 12 No. 3 (2025): Jurnal SPEKTRUM
Publisher : Program Studi Teknik Elektro UNUD

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/SPEKTRUM.2025.v12.i03.p2

Abstract

Public Street Lighting (PJU) is a crucial component of public infrastructure, but ineffective real-time maintenance often leads to slow damage detection, resulting in energy waste, high maintenance costs, and increased safety risks. Previous research has highlighted the importance of proactive monitoring systems based on the Internet of Things (IoT) for PJU energy efficiency. However, conventional Human-Machine Interface (HMI) solutions such as custom mobile applications are often expensive and inflexible. This research proposes the implementation of the Telegram API as a low-cost HMI for a real-time monitoring and damage notification system for PJU. This system integrates an ESP32 microcontroller with an LDR sensor, ultrasonic sensor, and PZEM-004T module for acquiring data on light intensity, traffic activity, and electricity consumption. The Telegram Bot is utilized to send monitoring data and damage notifications in real-time to operators without requiring additional applications or dedicated servers. The main innovation lies in using Telegram as the primary communication medium, which is fast, secure, and efficient. Test results show that the system successfully detects and notifies light conditions and monitors energy consumption accurately, with notifications received within 1-2 seconds as long as the internet connection is stable. This implementation proves that the Telegram API is a functional, responsive, secure, and cost-effective HMI solution for public infrastructure management, offering flexibility and ease of access across various platforms.
RANCANG BANGUN SISTEM MONITOR KONDISI AIR DAN PAKAN BERBASIS IOT DENGAN CATU DAYA PLTS PADA KOLAM LELE I Komang Alit Astawa; Putu Ananta Sastra Wijaya; I Made Aditya Wirawan; IGAP Raka Agung; I N Setiawan; I W Shandyasa; Pratolo Rahardjo; Yoga Divayana
Jurnal SPEKTRUM Vol. 12 No. 3 (2025): Jurnal SPEKTRUM
Publisher : Program Studi Teknik Elektro UNUD

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/SPEKTRUM.2025.v12.i03.p3

Abstract

Catfish farming requires proper monitoring of pond water quality and feed management. Limited time for farmers to monitor ponds directly poses challenges in maintaining water quality and feeding schedule accuracy. This study aims to implement a water quality monitoring device using sensors and an automated scheduled feeding system. This research uses a system development method based on the ADDIE model, consisting of five stages: Analysis, Design, Development, Implementation, and Evaluation. The developed device consists of sensors and actuators. Sensor data is displayed through the Firebase platform and OLED screen on the panel box. The system uses a 120 Wp solar panel with a LiFePO4 12V 22Ah battery as a power source. Testing for 3 days (May 18-20, 2025) showed an average pond water temperature of 25.1°C using DS18B20 sensor, average pH value of 7.7 using pH-4502c sensor, feed volume decreased from 6 kg to 4.9 kg (from 100% to 83%) measured using HC-SR04 sensor, and battery voltage between 13.2-13.8V measured using INA219 sensor. Automated feeding is carried out using a combination of a DC motor and servo motor. The results indicate that the system successfully integrates water quality monitoring and scheduled automated feeding using the Firebase platform. This system has the potential to be applied by fish farmers to overcome time constraints in direct pond monitoring.
REKAYASA SISTEM PRESENSI KLINIK KESEHATAN BERBASIS APLIKASI MOBILE I Made Cakra Pustaka1; I Ketut Putra Swastika; I Kadek Agung Bagus Satria Bumi Kelana; Made Sudarma; I Made Arsa Suyadnya; Duman Care Khrisne
Jurnal SPEKTRUM Vol. 12 No. 3 (2025): Jurnal SPEKTRUM
Publisher : Program Studi Teknik Elektro UNUD

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/SPEKTRUM.2025.v12.i03.p4

Abstract

Manual attendance systems in health clinics are often ineffective, reducing service quality, and increasing operational costs. This study designed an integrated digital attendance system with a mobile application for medical personnel and an admin website aimed at improving the efficiency and accuracy of attendance management. Development followed the Waterfall SDLC model, while testing included Black-Box Testing, Cognitive Walkthrough (CW), and System Usability Scale (SUS). The mobile application supports in-clinic/out-of-clinic attendance (Wi-Fi validation, geolocation, selfie photos, documents), leave requests, work schedules, attendance recaps, and pay slips. The admin website facilitates employee data management, attendance and leave validation, work schedule creation, and salary and attendance recaps. Black-Box Testing results showed success in all functional scenarios; CW recorded 96% effectiveness (mobile) and 98% (website) with very fast efficiency; SUS scores of 76.42 and 76.07, respectively, indicating good usability; and API testing proved smooth data integration. This system has been proven to be functional, effective, efficient, and ready to be implemented in health clinics.
RANCANG BANGUN LAMPU OTOMATIS UNTUK TANAMAN BUAH NAGA BERBASIS SMART AGRICULTURE Abdul Qodir; Lie Jasa; Wayan Gede Ariastina
Jurnal SPEKTRUM Vol. 12 No. 3 (2025): Jurnal SPEKTRUM
Publisher : Program Studi Teknik Elektro UNUD

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/SPEKTRUM.2025.v12.i03.p5

Abstract

Indonesia is an agrarian country rich in agricultural commodities, one of which is dragon fruit. Dragon fruit has high economic value and health benefits. However, the productivity of dragon fruit plants is greatly influenced by the duration and intensity of sunlight, which becomes a challenge during the rainy season or days with low light intensity. This study aims to design an automatic lighting control system based on a microcontroller with On/Off scheduling features to support dragon fruit cultivation in Krajan Village, Yosomulyo Village, Banyuwangi Regency. This system utilises Internet of Things (IoT) technology and the NTP protocol for time synchronisation, enabling real-time monitoring of sensors and lighting control without direct user intervention. The method used involved the design and testing of the microcontroller from January to February 2025. Test results indicate that the use of yellow LED lights can enhance flowering and plant growth by extending photosynthesis duration, particularly at night. Thus, this system effectively increases dragon fruit productivity and quality while providing an efficient solution for farmers facing natural lighting limitations.
ANALISIS KINERJA KODE BCH DAN WALSH DALAM SISTEM DIRECT SEQUENCE SPREAD SPECTRUM PADA KANAL FREQUENCY SELECTIVE FADING Joa Quin; Nyoman Pramaita; I Gst A. Komang Diafari Djuni H
Jurnal SPEKTRUM Vol. 12 No. 3 (2025): Jurnal SPEKTRUM
Publisher : Program Studi Teknik Elektro UNUD

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/SPEKTRUM.2025.v12.i03.p6

Abstract

This research aims to analyze the performance of Bose–Chaudhuri–Hocquenghem (BCH) (7,4) coding in a Direct Sequence Spread Spectrum (DSSS) system using Walsh spreading codes under selective fading and Additive White Gaussian Noise (AWGN) channels. The simulation was conducted using MATLAB Simulink by varying the energy-per-bit to noise power spectral density ratio (Eb/No) to evaluate system performance based on the Bit Error Rate (BER). The results show that applying BCH(7,4) significantly reduces the BER, especially at moderate to high Eb/No levels. Furthermore, the combination of Walsh codes with BCH(7,4) demonstrates superior performance compared to systems without error correction. This study highlights the importance of proper selection of spreading and error correction methods in optimizing digital communication performance over multipath fading channels.
RANCANG BANGUN PERBANDINGAN LUAS BATERAI BERBAHAN ALUMINIUM MENGGUNAKAN ELEKTROLIT AIR LAUT BERSIRKULASI TERBUKA DENGAN SISTEM KONTROL DATA TERSIMPAN Gilbert Mario Sembiring; Juan Evan Soaduon Tampubolon; Agus Dharma; I Gusti Agung Putu Raka Agung; I Made Mataram
Jurnal SPEKTRUM Vol. 12 No. 3 (2025): Jurnal SPEKTRUM
Publisher : Program Studi Teknik Elektro UNUD

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/SPEKTRUM.2025.v12.i03.p7

Abstract

The utilization of renewable energy in Indonesia remains suboptimal, despite its substantial potential. One promising approach to harness this potential is through aluminum-air batteries using seawater as an electrolyte, offering greater safety and sustainability compared to conventional batteries. However, the performance of aluminum-air batteries can still be improved, particularly in terms of stabilizing the no-load voltage. This study aims to determine the voltage output generated by two battery design methods with identical electrode surface areas: one configuration using four cells measuring 5 × 5 × 0.2 cm arranged in series, and the other using a single cell measuring 10 × 10 × 0.2 cm. Both designs operate with an open circulation system. For testing, both battery configurations were monitored using an Arduino microcontroller as a voltage reader, which captured the voltage output from each battery. The voltage output from the aluminum-air batteries was read by the Arduino through the ADC pin and displayed in real time on a 16x2 I2C LCD screen, with the seawater circulation driven by a DC pump acting as the flow medium. The experimental results showed that the aluminum-air battery with four cells of 5 × 5 × 0.2 cm arranged in series achieved a maximum voltage increase of 255.7%, reaching 4.34 V, compared to the single-cell configuration of 10 × 10 × 0.2 cm, which produced only 1.22 V.
PENGEMBANGAN APLIKASI WEB UNTUK MONITORING REKAM MEDIS PADA SISTEM E-HEALTH TRACKER BERBASIS IOT Martogi Jekson C. Siagian; Geraldo Alvin Sugiarto; I Gusti Agung Putu Raka Agung; Gede Sukadarmika
Jurnal SPEKTRUM Vol. 12 No. 3 (2025): Jurnal SPEKTRUM
Publisher : Program Studi Teknik Elektro UNUD

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/SPEKTRUM.2025.v12.i03.p8

Abstract

The digital transformation in the healthcare sector continues to advance significantly, particularly in the recording and management of electronic medical records. This study proposes the development of a web-based application for monitoring medical records within an E-Health Tracker system that leverages the Internet of Things (IoT), designed using a User-Centered Design (UCD) approach. The system aims to provide seamless access to health information for users through an intuitive interface and cross-device compatibility. The integration of IoT devices enables the transmission of vital health indicators—such as heart rate, body temperature, and oxygen levels—to a central server, which are then visualized through a web-based platform. A key advantage of this application lies in its flexible access and its potential to bridge gaps in healthcare services, especially in regions with limited medical infrastructure. This research is expected to contribute meaningfully to the equitable distribution of healthcare access and to raise public awareness of health literacy through the implementation of IoT-integrated web technologies.
RANCANG BANGUN SOLAR TRACKER SINGLE AXIS BERBASIS ARDUINO UNO Ngurah Yowana Asta Prawangsa; I Gusti Made Bagus Kurniawan; Ida Bagus Alit Swamardika; I Wayan Arta Wijaya; Lie Jasa; Pratolo Rahardjo; I Putu Elba Duta Nugraha
Jurnal SPEKTRUM Vol. 12 No. 3 (2025): Jurnal SPEKTRUM
Publisher : Program Studi Teknik Elektro UNUD

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/SPEKTRUM.2025.v12.i03.p9

Abstract

Indonesia has abundant solar energy potential; however, its utilization remains limited due to dependence on fossil fuels and the low efficiency of solar panels caused by static installation systems. To address this issue, this study designed and developed a prototype of an automatic single-axis solar tracker based on Arduino Uno to optimize solar energy absorption. The system is controlled by the Arduino Uno R3 for automatic adjustment of the solar panel position, and the ESP32 is used for real-time monitoring of environmental and electrical parameters. The sensors employed include the BH1750 for light intensity, DHT22 for temperature and humidity, INA219 for voltage and current, and ACS712 for current. Test results indicate that the system is capable of automatically adjusting the solar panel angle, accurately monitoring environmental parameters, and generating stable electrical power for eight hours. Although some instability in current readings was observed when the system operated on battery power, the prototype has proven effective and feasible for further development to enhance the utilization of solar energy.
PENERAPAN METODE AGILE SCRUM DALAM PENGEMBANGAN SISTEM INFORMASI ADMINISTRASI KEGIATAN COASS (CO-ASSISTANT) PADA RUMAH SAKIT PENDIDIKAN GIGI DAN MULUT I Gusti Ngurah Ari Wira Nugraha; Ngurah Indra ER; Komang Sri Utami; Fajar Purnama; I Wayan Shandyasa
Jurnal SPEKTRUM Vol. 12 No. 3 (2025): Jurnal SPEKTRUM
Publisher : Program Studi Teknik Elektro UNUD

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/SPEKTRUM.2025.v12.i03.p10

Abstract

The manual administration of the Co-Assistant (Coass) program at Dental and Oral Education Hospitals is often inefficient, prone to delays, and lacks transparency in data handling. To address these limitations, this study implemented a web-based information system developed using the Agile Scrum methodology. Development was carried out through five iterative sprints, totaling 106 story points, enabling the team to incrementally build and refine system features in alignment with stakeholder needs. The Scrum approach not only facilitated the completion of the product backlog but also proved instrumental in managing complex business logic and ensuring seamless inter-module integration. Key outcomes include enhanced efficiency in logbook recording, streamlined clinical assessment workflows, and improved data transparency. These results suggest that Agile Scrum is well-suited for dynamic, semi-academic environments such as teaching hospitals. This research offers a replicable, adaptive development model that can guide other health education institutions in accelerating the digital transformation of their academic and clinical administrative processes.

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