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Jurnal SPEKTRUM

spektrum
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Published by Universitas Udayana

ISSN : 23023163 EISSN : 26849186 DOI : -

Core Subject : Science, Engineering,

Computer Science & IT Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing 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 677 Documents

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PERANCANGAN DAN IMPLEMENTASI RESTFUL API PADA SISTEM INFORMASI MANAJEMEN DOSEN UNIVERSITAS UDAYANA Ida Ayu Kaniya Pradnya Paramitha; Dewa Made Wiharta; I Made Arsa Suyadnya
Jurnal SPEKTRUM Vol 9 No 3 (2022): Jurnal SPEKTRUM
Publisher : Program Studi Teknik Elektro UNUD

Lecturer Management Information System (SIM Dosen) Udayana University is a management information system to assist lecturers in improving performance in providing higher quality education. SIM Dosen was designed using a monolithic architecture will switch to a microservice architecture that is more flexible because it breaks down several applications into several services. Communication between services is carried out through the HTTP protocol using a RESTful API. This research focuses on the success of designing a RESTful API on one of the modules on the SIM Dosen which is “data dosen” module. RESTful API was successfully designed using the Java programming language and MySQL database. Testing the RESTful API functionality using the black box testing method and Postman on local device for GET, PUT, and DELETE method display a 200 response code and OK status, and for POST method display a 201 response code and Created status which indicate all the functions of each HTTP method used in “data dosen” module have been running according to their functions.

RANCANG BANGUN GEROBAK SORONG SEMI-OTOMATIS BERPENGGERAK MOTOR DC DENGAN MENGGUNAKAN METODE PULSE WIDTH MODULATION Yozi Abdullah Haqiqi; I Made Suartika; I Nyoman Setiawan
Jurnal SPEKTRUM Vol 9 No 4 (2022): Jurnal SPEKTRUM
Publisher : Program Studi Teknik Elektro UNUD

The wheelbarrow is a tool for transporting material in mining, plantation, and other areas that is pushed by one person with two rear handles and one wheel in the front. However, its use still requires and relies on a large amount of human power. The workers still have to expend energy to push the wheelbarrow which of course will be very heavy if the load is added in the wheelbarrow. Therefore, it is necessary to add an additional driving force to the wheelbarrow that can help the workers so that they can save their energy and also can make work more efficient. This wheelbarrow will use a DC motor as the driver and use Arduino uno with the PWM method as the control system. In addition, the tool will use a Lithium-ion battery so that it is more durable and can be easily recharged. The battery used has a voltage of 24V and a capacity of 9Ah. This semi-automatic wheelbarrow that uses a dc motor can help work faster up to about 32.5% more efficiently than without using a dc motor. In addition to being more efficient in use, wheelbarrows with dc motors also make it easier for users to use these tools compared to wheelbarrow without dc motors.

RANCANG BANGUN SISTEM PENYIRAMAN TAMAN HOTEL OTOMATIS BERBASIS INTERNET OF THINGS (IOT) MENGGUNAKAN ESP8266 I Made Ryan Handika; I Gst A. Komang Diafari Djuni Hartawan; i Made Ary Esta Dewi Wirastuti
Jurnal SPEKTRUM Vol 9 No 3 (2022): Jurnal SPEKTRUM
Publisher : Program Studi Teknik Elektro UNUD

COVID-19 is a virus that attacks the respiratory system, has a negative impact on health. The impact of the pandemic is the reduced number of tourists visiting the island of Bali, making sources of income very limited. This directly has a detrimental impact on hotel managers in Bali. With the policy of reducing the number of employees, it is clearly detrimental to all parties and we can see that several hotel facilities have been damaged, one of which is in the garden. In this final project, a garden watering system based on the Internet of Things was designed using ESP8266. This system works according to a programmed watering schedule, rain sensor readings, and soil moisture sensors. The tool will water the garden when the time conditions are met, the rain sensor detects the absence of rain around the park and also when the relay is active, it flows voltage to the solenoid valve to open the water flow to the Sprinkler. Then the watering data will be sent to the Thingspeak cloud which will also be accessible by applications on smartphones. Monitoring information will be displayed on the LCD and also the application on the smartphone. An IoT-based automatic hotel garden watering system prototype using ESP8266 is able to run according to design.

UNJUK KERJA SISTEM OFDM DENGAN MENGGUNAKAN ALGORITMA VFFT PADA KANAL AWGN N.K.W. Trisnawati; N.M.A.E.D. Wirastuti; I.G.A.K.D.D. Hartawan
Jurnal SPEKTRUM Vol 9 No 3 (2022): Jurnal SPEKTRUM
Publisher : Program Studi Teknik Elektro UNUD

The computational load and implementation costs of a system are affected by its complexity. The Fast Fourier Transform(FFT).algorithm use in an OFDM system necessitates intensive calculations, which affects the computational load and system complexity. There is a Very Fast Fourier Transform(VFFT) algorithm which has lower complexity than the FFT, and can replace FFT with Floating-Point accuracy. The aim of this study is to determine the performance of the OFDM system by using the FFT and VFFT algorithms over the AWGN channel, based on parameter value of BER vs. Eb/No. According to the simulation results, show that the OFDM (FFT) system has a better BER value, where when Eb/No reaches 6 dB the BER value is less than 10-2, while the OFDM(VFFT) system with a BER value is 10-2, but still has almost the same trend. This is because there is non uniform row gain in the OFDM(VFFT) system. However, with this weakness, OFDM(VFFT) can minimize the complexity of the OFDM system.

PENGARUH VARIASI JUMLAH SUDU TERHADAP EFISIENSI PADA PROTOTYPE PEMBANGKIT LISTRIK TENAGA MIKROHIDRO (PLTMH) DENGAN MENGGUNAKAN TURBIN VORTEX Kadek Rekha Agustha; Lie Jasa; I Made Suartika
Jurnal SPEKTRUM Vol 9 No 3 (2022): Jurnal SPEKTRUM
Publisher : Program Studi Teknik Elektro UNUD

Micro-hydro power plants using vortex turbines have the advantage that their operation can be carried out at low levels of falling water or head. One of the problems that exist in vortex turbine is there is no equation to determine the maximum output generated by the number of blades used. Based on the problems described, a prototype of micro-hydro power plants using vortex was made to test the variations in the number of blades to get the best efficiency. The prototype test in this study used a turbine with various number of blades of 3, 5, and 9 blades. Based on the research conducted, the increase of micro-hydro power plant prototype performance equals to number of blades used. When the system was set with a discharge of 4.5 liters per second paired with a turbine consisted of 9 blades which produced 303.8 rpm of turbine rotation before coupled by the generator and 230.5 rpm after coupled by the generator, the generator rotation was 653.5 rpm, the generator output voltage was 8.29 Volts, generator current output was 0.046, generator power output was 0.387 Watt, torque was 0.0393 Nm, and the highest efficiency was 2.92%

RANCANG BANGUN SISTEM MONITORING SUHU COLD STORAGE BERBASIS IOT MENGGUNAKAN WEMOS D1 R2 DI PT. AEROFOOD ACS DENPASAR Diky Wahyu Kusuma Budi; Rukmi Sari Hartati; I Gede Dyana Arjana
Jurnal SPEKTRUM Vol 9 No 4 (2022): Jurnal SPEKTRUM
Publisher : Program Studi Teknik Elektro UNUD

Monitoring temperature and humidity in cold storage is very important to prevent damage to food raw materials. Checking the temperature in the cold storage is carried out every 4 hours with the results manually written on the log sheet by the working staff and also sometimes there are staff who do not close the cold storage door tightly so that it causes an increase in temperature. Therefore an IoT-based cold storage temperature monitoring system is created using Wemos D1 R2 in real time which is very necessary. The design of this prototype uses hardware, namely the WeMos D1 R2 microcontroller because it is based on ESP8266 which can be connected to WiFi, DHT22 temperature sensor, and HC-SR501 PIR sensor. The software used is blynk and google spreadsheet. The results of this prototype design are being able to read the cold storage temperature and humidity properly which can be seen in the blynk application on a smartphone by displaying the temperature and humidity values. This prototype also has a feature that sends notifications to smartphones when the temperature is read more than 5°C and has temperature data stored on Google spreadsheets. The conclusion of this study has succeeded in designing and making a prototype of an IoT-based cold storage temperature monitoring system. The testing of the prototype can work well. The results of applying the prototype to cold storage Room 21 obtained an average temperature of 2.9°C and an average humidity of 86%.

RANCANG BANGUN PROTOTIPE MONITORING PENGAIRAN SAWAH BERBASIS LORA RA-02 SX1278 Z Zamani Noor; I G A Anom Semara Putra; KO Saputra; NMAE Dewi Wirastuti
Jurnal SPEKTRUM Vol 9 No 3 (2022): Jurnal SPEKTRUM
Publisher : Program Studi Teknik Elektro UNUD

Rice field irrigation is still done manually by farmers in opening and closing waterways, so it takes farmers time to manage waterways. In this study, a system was created with two types of devices, namely the sender and the receiver. The sending device consists of ArduinoUNO, Soil Moisture Sensor, Water Level Float Switch, and LoRa Ra-02 SX1278. Then, the receiver consists of NodeMCU ESP8266, LoRa Ra-02 SX1278, Relay, Water Pump. After testing, the system can send notifications to the user when the rice fields are dry or the rice fields are full, the pump can automatically turn on and turn off and the user also can turn the pump on or off via Telegram Bot. User can also command the device to operate automatically via Telegram Bot.

UNJUK KERJA KODE ORTHOGONAL M-SEQUENCE DALAM SISTEM DIRECT SEQUENCE SPREAD SPECTRUM MELALUI KANAL MULTIPATH FA Komang Gede Widi Adnyana; Nyoman Pramaita; I Made Oka Widyantara
Jurnal SPEKTRUM Vol 9 No 4 (2022): Jurnal SPEKTRUM
Publisher : Program Studi Teknik Elektro UNUD

Multipath and multi-user interference are the main challenges in wireless communication systems. This has become a driving force for the development of data transmission technology that is focused to overcome these problems, one of which is spread spectrum. Spread spectrum is applied to CDMA technology which has the limitations of MAI, so a spreading code is required with specifications that have a very low cross-correlation value as in the orthogonal m-sequence code. In this study, simulate the orthogonal m-sequence code with a length of 8 chips on a multipath fading channel using the Direct Sequence Spread Spectrum system with aims of assessing the performance of the orthogonal m-sequence code on a multipath fading channel, based on the effect of changes in the number of multipath components. The research method used is a Monte Carlo simulation on simulink with the output data in the form of a graph of the comparison value of BER with Eb/No. The results show that on the flat fading channel with the number of components multipath 1, the BER value of the simulation results is in accordance with the BER theory so that the simulation is valid and can be applied to frequency selective fading channels. In the frequency selective fading channel with the number of multipath components 4,6, and 8, the best performance was shown in the multipath 4 component with the smallest BER value, this was influenced by the ACF and CCF values so that the multipath 4 component had the lowest ISI and interference between users.

ANALISIS DAYA OUTPUT GENERATOR BERDASARKAN VARIASI DEBIT AIR PADA PROTOTYPE PLTMH DENGAN TURBIN VORTEX I Gusti Ngurah Agastya Citranath; Lie Jasa; I Made Suartika
Jurnal SPEKTRUM Vol 9 No 3 (2022): Jurnal SPEKTRUM
Publisher : Program Studi Teknik Elektro UNUD

Vortex turbine is a reaction water turbine that can utilize energy from low headed waterway. The power output of generator on microhydro power plant will differ depend on the input parameters used, such as water flow rates. Hence, this research goal is to find out the power output of generator from various water flow rates with an artificial waterway on a vortex turbine within the microhydro power plant prototype. This research consist a free variable of water flow rates of 2,5 l/s, 3,5 l/s, and 4,5 l/s using 9 blades turbine and paralel load lamps. From the experiment, raises of water flow rate is proportional to the increase of generator’s power output. The power output generated by each water flow rates used are 0,085 W at 2,5 l/s water flow rate, 0,256 at 3,5 l/s, and 0,387 at 4,5 l/s. Based on the experiment, it can be concluded that the increase of input water flow rate is equal to the increase of the power output generated by the generator. It is caused by the rotation of the turbine will be adjusted by the water flow rate used.

REVIEW RAGAM JENIS KAPAL PERIKANAN INDONESIA Bradley Axelius; I N. S. Kumara; W G. Ariastina
Jurnal SPEKTRUM Vol 9 No 3 (2022): Jurnal SPEKTRUM
Publisher : Program Studi Teknik Elektro UNUD

Indonesia as a maritime country with 2.23 million people working in the marine sector, one of which is a fisherman. Fishermen are one part of the fishing unit that plays a very important role for the success of a fishing operation. This paper reviews the fleet of vessels used by fishermen in Indonesia. The research method is a literature study taken from books, papers, the internet, and other sources that can support. The results of the review show that in carrying out fishing activities, fishermen in Indonesia use traditional and modern boats or boats. Types of boats or ships are divided into several categories. Depending on the type of fishing gear such as purse seine, trawls, dredge net, lift net, gill net, pole and line, long line, tonda ship, jungkung, and based on the propulsion system and ship size divided into powered boat and non-powered boat. In the operation of the ship, electricity is supplied by generators or batteries or batteries. To drive the sailing ship, a motorized engine is used, which is divided into inboard and outboard engines based on the layout, and is categorized into marine diesel engines and marineized engines based on their design and designation. On the other hand, to optimize the production of potential fisheries resources owned by Indonesia, it is necessary to increase the number of ships. The fluctuating growth in the number of vessels from 2002 to 2016, with the largest number of vessels amounting to 815,544 units in 2014 has not been able to maximize production from this potential. The Indonesian shipbuilding industry has also not developed in line with the challenges it faces. Development is still lagging behind the capacity, potential, demands and demands of the market. As well as social organizations also have an important role to increase capture fisheries production by providing guidanceThe information presented is expected to help the interests of the community such as the central government, local governments, researchers, students, and anyone who is interested in supporting the field of fishing vessels in Indonesia, especially the application of solar power plants on fishing boats.

Page 54 of 68 | Total Record : 677

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Nyoman Gunantara

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gunantara@unud.ac.id

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+6281558140279

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gunantara@unud.ac.id

Editorial Address
Program Studi Teknik Elektro Fakultas Teknik - Universitas Udayana d/a. Kampus Bukit Jimbaran Bali - 80364 Phone/ Fax: +62 361 703315

Location
Kota denpasar,

Bali

INDONESIA

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Home Page

OAI Link

Editorial Team

Contact

Reviewer

Google Scholar

Contact Name Nyoman Gunantara

Contact Email gunantara@unud.ac.id

Phone +6281558140279

Journal Mail Official gunantara@unud.ac.id

Editorial Address Program Studi Teknik Elektro Fakultas Teknik - Universitas Udayana d/a. Kampus Bukit Jimbaran Bali - 80364 Phone/ Fax: +62 361 703315

Location Kota denpasar, Bali INDONESIA

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Contact Name
Nyoman Gunantara

Contact Email
gunantara@unud.ac.id

Phone
+6281558140279

Journal Mail Official
gunantara@unud.ac.id

Editorial Address
Program Studi Teknik Elektro Fakultas Teknik - Universitas Udayana d/a. Kampus Bukit Jimbaran Bali - 80364 Phone/ Fax: +62 361 703315

Location
Kota denpasar,

Bali

INDONESIA