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Elektrika

elektrika
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Published by Universitas Semarang

ISSN : 20850565 EISSN : - DOI : -

Core Subject : Engineering,

Electrical & Electronics Engineering

Jurnal eLEKTRIKA diterbitkan oleh Jurusan Teknik Elektro, Fakultas Teknik, Universitas Semarang sejak tahun 2009, dan terakreditasi oleh Kementerian Ristekdikti pada tanggal 29 Januari 2009, dengan No. ISSN 2085-0565. Jurnal eLEKTRIKA adalah jurnal open akses dengan pelibatan mitra bebestari (peer-reviewed yang terbit dua kali dalam setahun, Maret dan Oktober.

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Articles 122 Documents

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RANCANG BANGUN BANTAL TERAPI BERBASIS ARDUINO Ningtias, Diah Rahayu; Sudarma, Made Putra; Harsoyo, Imam Tri
Elektrika Vol. 11 No. 2 (2019): Oktober 2019
Publisher : Universitas Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26623/elektrika.v11i2.1706

One form of physiotherapy is utilizing heat for recovery. Heat therapy can open blood vessels wider, thereby increasing blood flow and supply of oxygen and nutrients to reduce pain in joints, muscles, ligaments and injured tanks. To help health services in the field of physiotherapy the author modifies the therapeutic pillow with Arduino Uno and DS18B20 based as a temperature sensor, LCD as a temperature viewer and a timer and button that functions to choose how long it takes to do therapy. The design of therapeutic pillows is divided into two, namely hardware and software design, hardware design including power supply, a series of drivers and system scenarios. While the software design of this tool uses the Arduino and proteus applications as software. The result of the percentage error at the TP2 measurement is 0.02%. The measurement results on TP3 when the tool is off or off, then the circuit does not get a voltage while when the device is turned on or on the driver circuit gets a voltage of 1.4 Volt. After making the process of making, testing, testing tools and data collection, the author has succeeded in designing a heat therapy pillow using a temperature sensor and ARDUINO UNO based timer controller that can provide convenience when going to heat therapy because it is equipped with an automatically controlled temperature sensor and controller timer. by DS1820 temperature sensor. A therapeutic pillow based on Arduino with 10 minutes of therapy results in a temperature of 41 °C.

RANCANG BANGUN ANTENA MIKROSTRIP PATCH CIRCULAR DENGAN TEKNIK LINIER ARRAY UNTUK FREKUENSI WIFI 2,4 GHZ Saputra, Surya Hadi; Jayati, Ari Endang; Erlinasari, Erlinasari
Elektrika Vol. 11 No. 1 (2019): April 2019
Publisher : Universitas Semarang

Microstrip antenna when the antenna is one of the very rapid development in telecommunications systems that applied to many modern telecommunication equipment today. One application is the wifi. Wifi (Wireless Fidelity) is a wellknown tech-nology that utilizes an electronic device to exchange data wirelessly (using radio waves) over a computer network, including high-speed Internet connection, to provide a network connection to all users in the surrounding area. The purpose of this final project is to design microstrip patch antenna built a circular linier array that can be used for signal wifi stronger. The resulting microstrip antenna working in 2.4 GHz band with the acquisition of gain =3.4301 dBi, VSWR = 1.3749 and radiation pattern unidirectional. This antenna design simulation using the software Ansoft High Frequency Structure Simulator v13. For linear circular microstrip patch antenna array then showed its parameters.Keywords: Microstrip Antenna, Wifi, Array, VSWR, Gain

RANCANG BANGUN TACHOMETER DIGITAL BERBASIS ARDUINO DILENGKAPI CHARGING DAN MODE PENYIMPAN DATA Harsoyo, Imam Tri; Nugroho, Andi Kurniawan; Nuriman, Nuriman
Elektrika Vol. 11 No. 2 (2019): Oktober 2019
Publisher : Universitas Semarang

A good and feasible centrifuge is needed in the world of health, therefore a digital tachometer is needed to calibrate a centrifuge. Digital tachometer is a measuring instrument used to measure the rotation speed of a motor. This tachometer will be tested to function by being compared to using Digital Laser Photo Tachometer. This tachometer will display the number of rotations per minute of a motor according to the speed setting on the centrifuge using the output of this E18-D80NK sensor which will later be processed by the Arduino Nano. As for this feature charger and data storage mode, so that user can save the data of measurement results on SD Card, and beside that user can also be a way of charging when after usage or before usage. At testing the tool used point settings 1000, 2000, 3000, 4000, 5000, and 12000 RPM. Based on the measurement results of centrifuge using tachometer module and comparison tachometer have average percentage of error varying at each setting point. The smallest error 0.8% at the setting Point 3000 RPM, while the largest error 4.9% at the setting point 1000 RPM. The Tacometer error value on this Centrifuge measurement is still within the tolerance limit of ± 10%

ANALISA CITRA BERBASIS FITUR WARNA TEKSTUR DAN HISTOGRAM UNTUK MENENTUKAN KEMIRIPAN CITRA Sipan, Muhammad; Pramuyanti, Rony Kartika
Elektrika Vol. 11 No. 1 (2019): April 2019
Publisher : Universitas Semarang

Citra merupakan sebuah gambaran dari sebuah objek yang menarik untuk di teliti. Penelitian ini membahas tentang Analisa citra berbasis fitur warna, tekstur dan histogram. Fitur-fitur ini akan dicari untuk memperoleh nilai yang akan digunakan sebagai acuan untuk mencari kemiripan citra berdasarkan error pada citra. Besar kecil nya error yang di peroleh dari nilai-nilai fitur tersebut menunjukan besar kecilnya kemiripan dari sebuah citra.Fitur warna citra berpengaruh pada kejelasan sebuah objek yang ada pada citra tersebut. Dengan warna yang ber-beda-beda objek dapat dideteksi dengan cepat walaupun hanya dengan kasat mata. Analisa citra dengan fitur warna yang dilakukan menggunakan nilai RGB pada citra yang dicari fiturnya, yaitu nilai Red, Green dan Blue pada tiap blok pikselnya. Setelah nilai fitur watna diperoleh, kemudian dicari nilai fitur tekstur menggunakan metode statistika orde dua yaitu Gray Level Cooccurrence Matrix (GLCM). Fitur-fitur tekstur tersebut antara lain: Kontras, IDM ASM, Entropi, dan Korelasi.Tahap akhir dicari nilai histogram dari tiga kondisi citra yang berbeda-beda untuk menunjukkan kondisi terang, normal dan gelap. Nilai-nilai fitur yang di peroleh kemudian digunakan untuk mencari kemiripan citra dengan menentukan besar kecilnya nilai error, dimana pada penelitian ini digunakan MSE (Mean Square errors) dan MAE (Mean Absolute Errors) untuk mencari besar nilai error.Keyword: fitur, warna, histogram, Glcm, MSE.

PENGUAT KELAS D DENGAN METODE SUMMING INTEGRATOR Murtianta, Budihardja
Elektrika Vol. 11 No. 2 (2019): Oktober 2019
Publisher : Universitas Semarang

A class D amplifier is one in which the output transistors are operated as switches. When a transistor is off, the current through it is zero and when it is on, the voltage across it is small, ideally zero. Thus the power dissipation is very low, so it requires a smaller heat sink for the amplifier. Class D amplifier operation is based on analog principles and there is no digital encoding of the signal. Before the emergence of class D amplifiers, the standard classes were class A, class AB, class B, and class C. The classic method for generating signals driving a transistor MOSFET is to use a comparator. One input is driven by an incoming audio signal, and the other by a triangle wave or a sawtooth wave at the required switching frequency. The frequency of a triangular or sawtooth wave must be higher than the audio input. MOSFET transistors work in a complementary manner that operates as a switch. Triangle waves are usually generated by square waves fed to the integrator circuit. So the main part of processing audio signals into PWM (Pulse Width Modulation) is the integrator and comparator. In this paper, we will discuss the work of a class D amplifier system using the summing integrator method as its main part.

PENGATURAN SUHU UNTUK MENGATASI BAYI TERBAKAR BERBASIS ARDUINO DAN LABVIEW PADA INFANT INCUBATOR Ramdani, Dicky Rivaldo; Nugroho, Andi Kurniawan; Destyningtias, Budiani
Elektrika Vol. 11 No. 1 (2019): April 2019
Publisher : Universitas Semarang

An incubator is a place designed to maintain a certain temperature condition. Incubators are often found in hospitals and farms. In hospitals, the Incubator functions to warm newborns, or premature babies. On farms, this incubator is usually used for egg hatchers and as a place for newly hatched chicks. Incubators are usually in the form of a room or box (box) of a certain size. In this research will be designed a prototype to modify the infant incubator by adding sensors to regulate the temperature and control using a Arduino microcontroller. This incubator has a measurement system and temperature regulation using LM35 sensors, heaters and fans as actuators that can cool the incubator room with Arduino as controlling. Temperature setting will be monitored by LABVIEW. In the Arduino system a program can be set up that can adjust the temperature . The temperature required by the premature baby, so that it can maintain the stability of the temperature. If the temperature in the incubator is smaller than the temperature setting, the heater will turn on and the fan speed will decrease to increase the temperature according to the settings entered. If the temperature in the incubator is greater than the temperature setting entered, the heater will turn off. The results showed that the linear regression value between the temperature values with the ADC value of y = 0.4883x with a determination coefficient of 1, while the linear regression value between the temperature with a voltage value of y = 99.481x with a coefficient of 0.9984.Keywords: Infant Incubator, temperature sensor, LM35.

ANALISA SISTEM KERJA PERANGKAT AKTIF PT. TELKOM AKSES Prasetyo, Andika Singgih; Erlinasari, Erlinasari
Elektrika Vol. 11 No. 2 (2019): Oktober 2019
Publisher : Universitas Semarang

Penelitian ini bertujuan untuk mengetahui bagaimana sistem kerja di PT. Telkom Akses karena setelah penulis menganalisa sistem perangkat aktif PT. Telkom Akses, terdapat banyak manfaat bagi pelanggan ketika mereka mengalami kerusakan atau gangguan pada jaringan internet. Objek penelitian dalam penelitian ini yaitu system perangkat aktif PT. Telkom Akses. Pengumpulan data dilakukan dengan Studi lapangan yang meliputi wawancara dan pengamatan secara langsung serta Studi kepustakaan berdasarkan pada literatur terkait objek penelitian. Penulis hanya membahas dan menganalisa perangkat MSAN (Multi Service Access Node) saja. Hasil dari analisa tersebut adalah MSAN merupakan perangkat aktif karena mengaktifkan jaringan internet dan telepon sebelum ke pelanggan. Perangkat ini bergantung pada suplai listrik dari pln dan mendapat jaringan dari metro Ethernet menggunakan kabel FO (fiber optic)

Analisa Koordinasi Setting Proteksi Over Current Relay (OCR) Outgoing 20 kV dan Recloser pada Trafo II 60 MVA Feeder RBG 01 di Gardu Induk 150 kV Rembang Safitri, Indri; Gunawan, Gunawan; Nugroho, Agus Adhi
Elektrika Vol. 12 No. 1 (2020): April 2020
Publisher : Universitas Semarang

According to energy observers from the Institute for Essential Services Reform (IESR) the number of electricity consumers in Indonesia has increased by an average of 6-7% annually followed by an increase in the area of its services. An increasingly broad network is directly proportional to the potential for interference with the transmission and distribution system. The 150 KV Rembang substations is part of the Java-Bali Interconnection electrical system in northern Central Java that supplies electricity to the Rembang and surrounding areas. Rembang 150 KV substation on May 24, 2019, RBG 01 feeder experienced a disturbance behind the RB1-32 recloser and it was recorded that in 2019 PMT it had been tripped 4 times. Besides, there has been a change in equipment in the form of transformer II. These problems indicate the potential for interference that is not anticipated by the protection system, namely Over Current Relay and recloser. This study evaluates the setting of an outgoing 20 KV OCR protections and recloser on transformer II RBG 01 feeder Rembang 150 KV substation. The scenarios used are calculations with large variations of short-circuit current based on% distance, as well as the calculation of OCR and recloser settings with IEC 60255 standards. Setting currents in the protection equipment is regulated based on current conductivity (KHA) and load current on the recloser. The coordination of the protection settings resulting from this resetting will be compared to the conditions on the ground. Existing (field) OCR outgoing feeder RBG 01 condition TMS OCR value = 0.228 seconds, Iset = 480 A, and t op = 0.3 seconds. The existing OCR recloser condition TMS OCR value = 0.120 seconds and Iset = 400 A. The results of OCR coordinating outgoing feeder RBG 01 obtained TMS OCR value = 0.135 seconds, Iset = 585 A, and t operation = 0.3 seconds. OCR recloser resetting conditions obtained TMS OCR value = 0.10 seconds, Iset = 240 A and t operation = 0.198 seconds. The resetting conditions have met the IEC 60255 standard because recloser working time is smaller than outgoing work time.

Analisa Perhitungan Nilai Kapsitor Bank untuk Perbaikan Faktor Daya pada PT. Karya Toha Putra Lestari, Putri Dwi; Gunawan, Gunawan; Widihastuti, Ida
Elektrika Vol. 12 No. 1 (2020): April 2020
Publisher : Universitas Semarang

The use of electricity with large capacity sometimes faces various kinds of problems. These problems include network losses and voltage drops that occur in the channel. Improvement of electric power factor at PT. Karya Toha Putra is expected to improve the quality of electric power. This improvement is also expected to reduce the cost of electricity bills at PT. Karya Toha Putra. To be able to implement improvements in the quality of the electric power, it is necessary to calculate the reactive power compensated. In this case the power factor to be achieved is 0.95. After doing these calculations, the determination of the capacitor value will be used. By doing these stages, it is expected that the installation of capacitor banks can improve the quality of electric power. Bank capacitors are collections of capacitors used to provide reactive power compensation to improve the electrical power factor. From the results of the study showed that the amount of compensation needed to improve the power factor at PT. Karya Toha Putra is 50 kVAR, divided into 5 steps with one step, a capacitor of 10 kVAR.

Rancang Bangun Alat Hypo-Hyperthermia Berbasis Arduino ABA, Muhammad Ulin Nuha; Karim, Muhammad Nauval; Rofi i, Mohammad; Ningtias, Diah Rahayu
Elektrika Vol. 12 No. 1 (2020): April 2020
Publisher : Universitas Semarang

Hypo-hyperthermia tool is a devive that can stabilize body temperature which decreases or increases temperature dramatically. The design of hypo-hyperthermia devices has been made using Arduino Uno. Functional tests have also been carried out on the hypo-hyperthermia tool to determine the level of success and eligibility. This tool works by utilizing the flow of water to provide the temperature needed by the patient in order to obtain a normal temperature, namely by increasing the temperature of the blanket when the patient has hypothermia and lowering the temperature of the blanket when the patient has hyperthermia. The design of this hypo-hyperthermia tool uses Arduino uno as a processor and DS18B20 sensor for temperature readings. Heaters are also used as water heaters, condensers as water coolers, and water pumps to drive the water cycle from the appliance to the blanket and back to the appliance. The temperature and mode settings will be displayed on the LCD screen. Function test results obtained by comparing the value of the temperature reading in skin mode with a digital thermometer that is obtained an error value of 0.3%. This temperature difference is affected by the room temperature and body temperature of the patient which can change at any time. It was also obtained by comparison of the temperature reading values in blanket mode with a digital thermometer that is obtained the largest error value of 6% at a setting value of 25 °C and the smallest error value of 0.3% at a setting value of 30 °C. This temperature difference is influenced by the temperature of the room at the time of measurement on the blanket is also influenced by the thickness of the hose installed on the blanket, so that the cold temperature in the water is not absorbed properly.

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