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Program Studi Teknik Elektro Fakultas Teknik, Universitas Udayana Jl. Kampus Bukit Jimbaran
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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 30 Documents
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ANALISIS KELAYAKAN INVESTASI PEMBANGKIT LISTRIK TENAGA SURYA PADA ATAP GEDUNG RUMAH SAKIT UNIVERSITAS UDAYANA Ketut Mira Ardianti; Dyana Arjana; Indra Partha; Maharta Pemayun
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.p11

Abstract

The increasing global electricity demand, predominantly met by fossil fuels, necessitates renewable energy development. Indonesia, with its vast solar potential, still faces limited implementation of Solar Power Plants (PLTS). This study analyzes the investment feasibility of a rooftop PLTS at Udayana University Hospital (RSPTN Universitas Udayana), utilizing 2023 electricity consumption data and current component pricing. The research aims to determine the Cost of Energy (COE), conduct a comprehensive economic analysis using Net Present Value (NPV), Internal Rate of Return (IRR), Profitability Index (PI), and Payback Period (PP), and propose a suitable PLTS management model. Findings indicate strong financial viability for this PLTS investment. Calculations reveal a Life Cycle Cost (LCC) of Rp3,190,730,607, a Capital Recovery Factor (CRF) of 0.0746, and an estimated annual energy production of 498,955 kWh. The calculated COE is Rp803.00. The investment yields a positive NPV of Rp3,818,228,293, a PI of 2.357 (>1), and a Payback Period (PP) of 6 years and 9 months, well within the system's operational lifespan. The positive IRR (10.59%) further supports its financial viability, positioning this rooftop PLTS project as a sound and sustainable investment for RSPTN Universitas Udayana.
STUDI PERBANDINGAN EFISIENSI ENERGI DAN BIAYA OPERASIONAL KOMPOR INDUKSI DAN LPG BERBASIS IOT A. Andriani; H.C Soetanto; G.K. Sandy; I. N. S. Kumara; W. G. 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.p12

Abstract

This study designs an Internet of Things (IoT)-based monitoring system for 2 kW induction and 2 kW LPG stoves, supporting Indonesia's 2060 Net Zero Emission energy transition policy. Utilizing Arduino Mega 2560 with ESP8266, PZEM-004T sensor, K-type thermocouple, load cell, and Blynk platform, the system provides real-time monitoring of voltage, current, power, temperature, gas mass, and operating time. Data is accessible via a mobile application and stored on an SD card for analysis. Safety features include remote electricity/gas cut-off and active stove notifications. Testing reveals the induction stove's higher efficiency, heating 400 ml of cooking oil in 193 seconds with 0.06 kWh, compared to the LPG stove's 281 seconds with 19.18 grams of gas. Operational cost analysis indicates the induction stove is more economical (Rp 101.97) than subsidized LPG (Rp 159.87), suggesting a more favorable long-term investment for induction technology. By facilitating data collection, remote control, and review, the proposed system allows for evaluation of both technical and economic efficiencies. This study offers an IoT based technical solution and economic assessment that support the national policy shift toward induction stove.
RANCANG BANGUN SISTEM MONITORING PERTANIAN HIDROPONIK BERBASIS IoT DAN APLIKASI MOBILE (HYDROTECH) I Putu Prasna Mahardika; Putu Pande Deva Ryana Putra; Duman Care Khrisne; I Made Arsa Suyadnya
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.p13

Abstract

Urban agricultural land conversion encourages the use of hydroponic systems. However, people's busy lives make it difficult to monitor the nutrition and environment of hydroponic plants. This study developed a monitoring system called Hydrotech, an IoT-based hydroponic monitoring system with an ESP32 microcontroller and pH, TDS, temperature (DS18B20), and water level sensors. Data from the sensors is sent to Firebase and displayed through a mobile application. The method used is an experiment and literature study. Testing was carried out by planting lettuce using the Hydrotech system to evaluate its performance. Primary data was obtained from device testing which includes data from research on the sensors used, while secondary data was obtained from previous research sensor data as a comparison with the current study. The results of this study indicate that the four sensors used, namely the pH, TDS, water level, and temperature DS18B20 sensors, can function properly. Hydrotech is also equipped with an Android application to display sensor data in real time and present historical data for each sensor used for further analysis on hydroponic plants. The Hydrotech application is also filled with a planting calendar as a reminder of planting and harvesting times for hydroponic plants. This Hydrotech monitoring system helps city residents manage hydroponics optimally and efficiently in terms of both energy and time.
RANCANG BANGUN E-HEALTH TRACKER UNTUK DETEKSI DETAK JANTUNG, SATURASI OKSIGEN, SUHU TUBUH, DAN TEKANAN DARAH BERBASIS IoT I Dewa Gede Agung Wahyu Mahendra; I Made Beni Satriya; 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.p14

Abstract

The Internet of Things (IoT)-based health monitoring system presents a potential solution to improve remote healthcare services, particularly in areas with limited access. This study developed an IoT-based E-Health Tracker capable of measuring four vital health indicators: heart rate, oxygen saturation (SpO₂), body temperature, and blood pressure. The system integrates the MAX30102, DS18B20, and MPX5050GP sensors with Arduino Uno and ESP32 microcontrollers. Measurement data is displayed locally via an LCD TFT. Evaluation was carried out through experimental testing involving 5 participants over 7 consecutive days (a total of 35 samples). The system’s results were compared with conventional medical devices (oximeter, thermometer, and blood pressure monitor), and accuracy was assessed using the Mean Absolute Percentage Error (MAPE) method. The results showed that the system achieved very good to good accuracy levels, with MAPE values of 1.75% for heart rate, 1.28% for SpO₂, 2.67% for body temperature, and 7.74% for blood pressure. This system can serve as an alternative for IoT-based health monitoring.
RANCANG BANGUN PROTOTYPE MONITORING SYSTEM BERBASIS INTERNET OF THINGS PADA INKUBATOR PENETASAN TELUR AYAM Devin Gede Herawan; I Kadek Agus Arta Yasa; Ida Bagus Alit Swamardika; Lie Jasa; I Wayan Arta Wijaya
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.p16

Abstract

The hatching process of chicken eggs is highly dependent on a stable incubation environment, especially consistent and standard temperature and humidity. Fluctuations or instability of conditions within the incubator can significantly reduce the success rate of egg hatching (hatching) as well as degrade the quality of the chicks produced. In response to this challenge, this study developed an Internet of Things (IoT)-based monitoring system. The system is designed to monitor crucial parameters such as temperature, humidity, electric current, and voltage inside the incubator. The data collected from the monitoring is then transmitted using the ESP32 module to the ThingSpeak platform. This integration allows users to monitor the condition of the incubator at any time and remotely over an internet connection, providing flexibility and ease of supervision. The test results show that the developed system is able to provide accurate and responsive environmental condition data, and plays an important role in maintaining the stability of the incubation environment. This is expected to increase egg hatchability and support the production of better quality chicks.
PEMANFAATAN INTERNET OF THINGS (IOT) PADA PERANCANGAN SISTEM BANGUNAN CERDAS Komang Bagus Dwi Widiatama Putra; I Nyoman Satya Kumara; I Wayan Sukerayasa; I Made Arsa Suyadnya
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.p17

Abstract

The development of Internet of Things (IoT) technology has made a significant contribution to the design of smart building systems. This research discusses the utilization of IoT in designing smart building systems based on previous studies. The focus of the discussion includes the use of controllers, various types of sensors and control devices, and system scope. By understanding the use of IoT devices and the approaches used in prior research, this study is expected to serve as a reference in the development of smart building systems to be more adaptive and efficient in the future.
RANCANG BANGUN PEMBANGKIT LISTRIK TENAGA MIKRO HIDRO TURBIN CROSS-FLOW PADA SUNGAI AYUNG Sega Awaludin; Putu Agus Arcana Surya; Cokordei Gedei Indra Partha; I Wayan Arta Wijaya
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.p18

Abstract

The Cross Flow turbine is a type of turbine that utilizes hydraulic energy (water) from the Ayung River flow as its driving force and is very suitable for use in places with low head. Currently, the Cross Flow turbine is still very little used in Indonesia, especially in Bali. This is due to the difficulty of direct measurements by conducting tests related to influential parameters in the field. Therefore, it is necessary to. create a Micro. Hydro Power. Plant (MHP) with adequate terrain and water discharge and is not difficult to measure so as to obtain specific data. This study aims to create a design, determine the turbine specifications, analyze the torque, rotation speed, voltage, current, power, and, efficiency. generated from the MHP prototype with the Cross Flow turbine. The benefits of this study are also, expected. to be a referencei for further researchers to conduct research on MHP. The methods used in this study are, the library method, and the observation method. This study also discusses the analytical study of, the existing. hydropower potential, namely, the. water flow discharge and the height of the waterfall (head) of the Ayung River water flow. The turbine design calculation obtained an effective height of 6 meters with an inlet water velocity of 10.63 m/s and a circumferential velocity of 10.22 m/s indicating that the runner has an outer diameter of 0.15 meters, an inner diameter of 0.1 meters, a runner width of 0.1 meters, a distance between blades of 0.026 meters, a blade width of 0.025 meters, and a total of 18 blades. This prototype, test uses, a water flow, rate of 7 L or 0.007 opening, a guide vane angle of 30. The output produced in the no-load test obtained an average. turbine rotation results before being, coupled to a generator of 539 rpm, an average, turbine rotation results after being coupled of 415 rpm. The average result of the. largest turbine rotation under load is 504 rpm, the largest, generator rotation result under load is 306 rpm, the largest average generator, voltage. result is 9.64 volts, the, largest average. generator, current result, is 0.33 Ampere, thei largest. average, generator, power result is 3.23 Watts, the largest torque result is 0.07 Nm, the largest. PLTMH efficiency result is 6%.
EVALUASI KEBERGUNAAN SISTEM INFORMASI ADMINISTRASI COASS MENGGUNAKAN SYSTEM USABILITY SCALE (SUS) Kadek Rangga Dwipayana; Ngurah Indra ER; I Wayan Shandyasa; Fajar Purnama; Komang Sri Utami
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.p19

Abstract

The adoption of new technology in professional settings is often hindered by low user acceptance, making usability a key factor in successful implementation. This study aims to assess the perceived usability of a web-based administrative information system for the Coass program at the Dental and Oral Hospital (RSGM). The evaluation used the System Usability Scale (SUS) method with 41 respondents, including Coass students, dentists, and administrative staff. The average SUS score was 80.121, categorized as "Excellent." These results indicate that the system is highly user-friendly and well-accepted, reflecting effective interface design and user experience as strong indicators of institutional adoption.
RANCANG BANGUN SISTEM SENSOR OTOMATIS PADA ALAT PENERANGAN JALAN (APJ) DI JALAN BUKIT DHARMA RAYA JIMBARAN I Wayan Darsana; I Wayan Sukerayasa; Cokorde Gede Indra Partha
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.p20

Abstract

Street lighting plays a crucial role in supporting public safety and comfort, especially at night. However, many areas, such as Jalan Bukit Dharma Raya Jimbaran, still lack adequate lighting systems. This study designs and implements an intelligent street lighting system based on the Internet of Things (IoT), utilizing the ESP32 Devkit V1 as the central controller, along with an LDR sensor, ultrasonic sensor, and an AC Light Dimmer to automatically adjust light intensity according to time and traffic conditions. Test results show that the system operates efficiently and adaptively, achieving energy savings of up to 17.6% and cost savings of Rp 54.39 compared to a manual system, with efficiency levels varying depending on road user activity. The prototype has proven effective in enhancing energy efficiency and offers an adaptive lighting solution that can be further developed to support the concept of a sustainable smart city.
RANCANG BANGUN SISTEM PAYUNG OTOMATIS BERBASIS INTERNET OF THINGS I Made Agus Calvin Ardhana Putra; I Putu Agus Eka Saputra; I Gusti Agung Putu Raka Agung; Anak Agung Ngurah Amrita
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.p21

Abstract

This study designs an Internet of Things (IoT)-based automatic umbrella system that can be operated manually or automatically via the Blynk application. The process begins with device initialization, including the configuration of the ESP32, servo motor, rain sensor, RTC, push button, and switch. The device then connects to a Wi-Fi network to enable data transmission and reception. In manual mode, the user can open or close the umbrella using a physical button or commands from Blynk. In automatic mode, the system follows a preset schedule: the umbrella opens from 08:00 to 16:00, remains open from 16:00 to 22:00 if rain is detected, and closes from 22:00 to 08:00. Data such as servo position, umbrella status, time, and operation mode are sent to Blynk in real time. Test results indicate that the system functions according to the design, provides ease of use, and helps protect.

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