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INDONESIA
GEMA TEKNOLOGI
Published by Universitas Diponegoro
ISSN : 08520232     EISSN : 2656582X     DOI : -
Core Subject : Science,
Computer Science & IT
Gema Teknologi Journal (pISSN : 0852-0232, eISSN : 2656-582X) is an open access journal published by Vocational School, Diponegoro University, Indonesia. Gema Teknologi publishes articles from various engineering disciplines (the results of original scientific research or new scientific studies of literature). Editor receives articles both in English and Indonesian. Gema Teknologi Journal is published 2 (two) times a year, on April and October.
Arjuna Subject : -
Articles 166 Documents
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PELATIHAN DAN PRAKTEK PEMBUATAN SABUN CUCI TANGAN CAIR DI PKK TEMBALANG PESONA ASRI Kusumayanti, Heny; Paramita, Vita; Wahyunimgsih, Wahyunimgsih; Amalia, Rizka; Siregar, Vynda Dindasari; Pudiastuningtyas, Nurul
Gema Teknologi Vol 20, No 1 (2018): April 2018 - October 2018
Publisher : Vocational School Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (220.536 KB) | DOI: 10.14710/gt.v20i1.21079

Abstract

Heny Kusumayanti, Vita Paramita, Wahyunimgsih, RizkaAmalia, Vynda Dindasari Siregar, Nurul Pudiastuningtyas, in this paper explain that soap is used as a cleaning agent. Hand sanitizer is a hand sanitizer which makes it easy and can be carried out by PKK mothers and the community. The purpose of this liquid handwashing soap training and practice is to provide knowledge and appropriate technology to the PKK mothers in Tembalang Pesona Asri RT I RW IV Kramas Semarang, in addition to making their own liquid handwashing for self consumption can also be sold so can increase income. The result of this activity is liquid hand washing soap which is red, has a fragrant odor and when used does not cause roughness in the hand.
WATTMETER DIGITAL DENGAN MIKROKONTROLER DAN ARDUINO UNO 2 Yulian, Eki; Sasmoko, Priyo
Gema Teknologi Vol 18, No 3 (2015): April 2015 - October 2015
Publisher : Vocational School Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (116.945 KB) | DOI: 10.14710/gt.v18i3.22033

Abstract

Eki Yulian, Arkhan Subari in this paper explain that Power consumption in boarding houses still can not be monitored , so that power usage bill payments based solely on electrical equipment used in the room . This would be detrimental to the owner of the boarding when the power consumption is too large . But tenants boarding can also be harmed if rarely use electricity must still pay the electric bill to the owner of the boarding.Thus making the tool use of electricity for the purposes of calculating a dorm room at the end of the project , expected to assist in completing the problem. In this tool using optocoupler sensor mounted on a disc kwh meter analog and microcontroller will process the data readings from sensors optocoupler . The output of this tool will appear on an LCD (liquid circuit display) . Where is the data to be displayed is the amount of power usage and costs to be paid . In addition , the tool uses the SMS facility for monitoring power use. Thus the cost paid by the tenant to the boarding room owner would be more in line with the use of electricity in use by tenants boarding. Keywords :optocoupler sensor, microcontroller , SMSDAFTAR PUSTAKAAndrianto, Heri. 2008. Pemrograman Mikrokontroler AVR ATMEGA 16 Menggunakan Bahasa C (CodeVisionAVR). Informatika: BandungBejo, Agus. 2008. C & AVR.  Graha Ilmu: YogyakartaFidzon, Adil. 2011. Miniatur Sistem Parkir Mobil Otomatis Berbasis Mikrokontroler ATmega8535. Undip : SemarangHardika,  Doni.  2012. Pembuatan Aplikasi Mikrokontroler ATmega8535 Dalam Otomasi Alat Pencacah Permen Skala Home Industri. Undip : SemarangFrank D, Peetruzella. 1996. Elektronika Industri. Andi : YogyakartaMalvino, A.P. 1996. Prinsip-prinsip Elektronika (terjemahan Hanapi Gunawan). Erlangga: JakartaM.C, Sharma. 1993. Praktikal Music dan Sound Circuit. Halaman 123 : New DelhiPratama, LiusWeny. 2009. Sistem Absensi Otomatis Pengunjung Perpustakaan Dengan Menggunakan Radio Frequency Identification. Laporan Tugas Akhir Politeknik Negeri Sriwijaya : PalembangSudjadi. 2005. Teori dan Aplikasi Microcontroller. Graha Ilmu : YogyakartaSumanto, MA. 1984. Mesin Arus Searah. Andi Offset : YogyakartaTurbian, K. 1973. A Manual for Writers of Term Papers, Theses and Dissertations. 4th. Ed. The University of Chicago Press. Chicago.Wardana, E.K. 2013. Pintu Pengaman Untuk Ruang Penyimpanan Dokumen Menggunakan RFID (Radio Frequency Identification) Berbasis Mikrokontroler Atmega16. Undip:SemarangWardani, dkk. 2008. Teknik Menulis Karya Ilmiah. Universitas Terbuka : JakartaWardhana, Lingga. 2006. Mikrokontroler AVR seri ATMEGA Simulasi, Hardware, dan Aplikasi. Andi : Yogyakarta
ANALISA KARAKTERISTIK BIODIESEL NYAMPLUNG Darmanto, Seno; Sediono, Windu; Sarwoko, Sarwoko; Triyatno, Triyatno
Gema Teknologi Vol 16, No 4 (2012): October 2011 - April 2012
Publisher : Vocational School Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (36.37 KB) | DOI: 10.14710/gt.v16i4.4784

Abstract

Seno Darmanto, Windu Sediono, Sarwoko, Triyatno, in this paper explain that making of callophylum inophylum biodiesel fuel is done alkaly transesterification methode. Alkaly transesterification methode use methanol and basa (NaOH) of catalist. Procedur and setting of research that is consisted in material selection, treatment and setting of composition of methanol and catalist, operational temperature, reaction time, speed and mixer technical will effect quality and conversion level of callophylum inophylum biodiesel. And based data analyzer show that conversion of callophylum inophylum biodiesel can reach 90%. Properties of callophylum inophylum biodiesel show viscosity and flash point of callophylum inophylum biodiesel is ligthly higher than diesel fuel. And caloric value of callophylum inophylum biodiesel is slightly lower than diesel fuel. Key words: callophylum inophylum, biodiesel, properties, transesterification.
SIMULASI SISTEM PENGHITUNG JUMLAH MOBIL KELUAR DAN PENGHITUNGAN TARIFNYA BERDASARKAN LAMA WAKTU PADA GEDUNG PARKIR MOBIL BERLANTAI TIGA BERBASIS MIKROKONTROLER ATMEGA 8535 Ary M, Ruky Sandra; Manan, Saiful
Gema Teknologi Vol 17, No 3 (2013): April 2013 -October 2013
Publisher : Vocational School Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (532.037 KB) | DOI: 10.14710/gt.v17i3.8927

Abstract

Ruky Sandra Ary M, Saiful Manan, in this paper explain that parking lot which is widely used today do not present an empty parking location data, causing the vehicle entering the parking area must first find an empty parking space. This led to queues of vehicles becomes unavoidable. Even vehicles must berputarputar first to find an empty parking space. Therefore, it needs a parking system that can alert parking block capacity is still empty. Parking tariff determination system also plays an important role, most of the park determines the rate only on the type of vehicle rather than on how much time parking felt unjust for some people. This study designed a microcontroller-based parking system that can determine the number of cars remaining at the same time counting parking rates is a unified tool that can be divided into two, namely, hardware and software as a mechanical system that will work as a control system and the process of calculating tariffs. Keywords: parking system, Microcontroller 8535, Infrared, parking rates, Password
PROTOTYPE GROUNDING DETECTOR PADA GROUND CLUSTER DENGAN SISTEM INTERLOCKPADALBS (LOAD BREAK SWITCH) BERBASIS ARDUINO MEGA 2560 DENGAN TAMPILAN HMI (HUMAN MACHINE INTERFACE) Pasaribu, Bambang Handoko; Setiono, Iman
Gema Teknologi Vol 19, No 4 (2018): October 2017 - April 2018
Publisher : Vocational School Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (288.994 KB) | DOI: 10.14710/gt.v19i4.19151

Abstract

Electricity has become a daily necessity in the community both social, economic and business. Therefore electricity is needed every day and it is the reliability of PLN. To fulfill such reliability While the reliability of electrical energy should be followed by inspection on the equipment used. PLN field employees themselves who every day always do inspection on the network of all the repeaters, so that field officers always know the state of the network in the field. If the network looks bad or requires maintenance it will be scheduled to do the job. Before the holding of the work it will be done in the first outage area is to operate the switching tool didaerah area. The switching tools are ABSW and LBS. After all the swithing tools are operated the workers always do the grounding first on the three phases by using ground clusters at the starting point to the end of the work where if transmitted so called PMS ground. This is done as a safety because the LBS switching tool is closed so that workers are not sure if the network has been extinguished and as a safety if LBS failed to work or failure. But here the worker himself sometimes still not sure whether the ground cluster is already installed properly or not. And as a safeguard against the occurrence of any maneuvering done by employees from the office Rayon. Therefore the author wants to make a prototype to detect whether grounding is installed properly or not in every phase. The prototype uses Arduino mega as its micron and uses a voltage sensor to find out the value of the voltage. If the ground claster is installed and work fails on LBS then the OCR relay will work and PMT will trip. With the prototype is expected to improve security in the work and minimize the occurrence of work accidents. This prototype has a 0% chance of a crash if the ground cluster is properly installed. 
PENGOPERASIAN RFID SEBAGAI OPERATING USER PARKING AREA DENGAN METODE ELEKTRONIK PARKING PRICING (EPP) BERBASIS ARDUINO UNO Wijayanto, Ari; Sasmoko, Priyo
Gema Teknologi Vol 18, No 3 (2015): April 2015 - October 2015
Publisher : Vocational School Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (272.135 KB) | DOI: 10.14710/gt.v18i3.21932

Abstract

Ari Wijayanto, Priyo Sasmoko, in this paper explain that for operation RFID Parking Area User Operating Method Electronic Parking Pricing ( EPP ) Based Arduino Uno we created to see the problems that occur at this time , where the application of the parking area where the management is still done manually, especially in terms of payments .. We design a tool capable overcome these weaknesses , ranging from providing information about the availability of parking space to the user before entering the parking area to the effectiveness of the method of payment , which uses an identity card balance . With this tool is expected to reduce queuing/ speed up queues of vehicles wanting to enter / exit the parking lot. The system is also supported by the Arduino Uno as the brain to process data from RFID . RTC components to calculate the time and date , LCD display , and a servo motor as the driving door portal. Infrared to close the portal and counting vehicles entering and exiting. Keywords : RFID, Operating User Parking Area, EPP, Arduino UnoReferencesMalvino. 1995. Prinsip-prinsip Elektronkasi. Jakarta : Erlangga.Van Vlack. Lawrench, Ilmu dan Teknologi Bahan, Erlangga, hal 186Djuaji, Very. 2011, Pengenalan Arduino. hal.9Finkenzeller Klaus, 2010, RFID Handbook, 319Elektuur, B.V. 1986. 301 Rangkaian. Diterjemahkan oleh: Ignatius. Jakarta: Elex Media Komputindo.Tri, 2014 Metode Penulisan Karya Ilmiah, Bandung: Kelompok keahlian Ilmu Kemanusian Institut Teknologi Bandung.Jogiyanto, 2003, Konsep dasar Pemrograman Bahasa C, Yogyakarta: Andi.Annonimous. 2012. Mengenal Arduino UNO. Diunduh dari http://www.sahabat-informasi.com/2012/07/mengenal-arduino-uno.html pada 25 mei pukul 20.02 WIB.
PENGARUH SUHU BAHAN BAKAR TERHADAP KEPERLUAN BAHAN BAKAR PADA MOTOR DIESEL SATU SILINDER 20 HP DENGAN ELEKTROLISER Sutomo, Sutomo; Murni, Murni; Rahmat, Rahmat
Gema Teknologi Vol 16, No 3 (2011): April 2011 - October 2011
Publisher : Vocational School Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (150.855 KB) | DOI: 10.14710/gt.v16i3.4708

Abstract

Sutomo, Murni, Rahmat, An internal combustion process of fuel will works effectively if the fuel’s density and viscosity is lower so we would like to use a heater in order to decrease the density and viscosity of the fuel. Based on this condition, we would like to use an electrolizer and a diesel engine to improve the fuel consumption. Electrolizer will increases the gas reaction so we hope that fuel consumption rate will decrease. The result of this research is the effective temperature of fuel is 50oC – 60oC will produce the effective combustion. The fuel consumption decreased in 6 kW is 0.12 lt/kWH. Key word: diesel engine, electrolizer, temperature
IMPLEMENTASI ARM MANIPULATOR DAN SENSOR WARNA DALAM PROTOTYPE OTOMATISASI SISTEM PENYORTIR BOX BERWARNA BERBASIS MIKROKONTROLLER AVR ATMEGA 8535 Wibowo, Roby Adi; Subali, Subali
Gema Teknologi Vol 17, No 2 (2013): October 2012 - April 2013
Publisher : Vocational School Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (253.237 KB) | DOI: 10.14710/gt.v17i2.8918

Abstract

Roby Adi Wibowo, Subali, in paper implementation of ARM manipulator and color sensor in prototype of color box sorter automation system based on microcontroller AVR ATMega 8535 explain that the rapid development of technology at all times encourage people to overcome problems that arise around it. With a view to facilitate the work and time efficiency. Included in the field of automation control systems in a work process. One of these systems automation in sorting colored box, so that a product can be separated from one another and in accordance with the qualifications color. In this final task will be made a colored box sorter automation system using the color sensor as a detector and a manipulator arm actuator to take the box to place each color.   Keywords; Arm manipulator, colours sensor
KOORDINASI SETTING RELAI ARUS LEBIH PADA INCOMING 2 KUDUS TERHADAP OUTGOING KUDUS 5 DAN 6 YANG MENGGUNAKAN JARINGAN DOUBLE CIRCUIT DI GI 150 KV KUDUS Wardani, Sartika Kusuma; Subali, Subali
Gema Teknologi Vol 18, No 2 (2015): October 2014 - April 2015
Publisher : Vocational School Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (694.027 KB) | DOI: 10.14710/gt.v18i2.8975

Abstract

Sartika Kusuma Wardani, Subali, in paper coordination of flow over relay setting in incoming 2 kudus to outgoing 5 and 6 using double circuit network on GI 150 KV kudus explain that PT PLN make every effort to improve service to customers , one of them by increasing the reliability of the distribution of electrical energy . Reliability of the distribution network is very important for both consumers and PLN. One measure of the reliability of the system / network is a factor SAIDI (System Average Interruption Duration Index) and SAIFI (System Average Interruption Frequency Index). Steps that have been done one way to minimize the possibility of interference is by installing protective devices on medium voltage networks. However, installation of protection equipment is not enough if the relay setting coordination between the incoming and outgoing imprecise. In fact in recent months, an interruption in the feeder distribution network which affects the incoming relay tripnya due to failure of the feeder protection system. One of the events that have happened several times is the same disorder in a double feeder circuit (network supplied from a single source by using two networks ( two feeder ) were included in the bus and in 1 pole) and holy 5 and  6 which causes the incoming PMT trip. It is very risky to happen, because the resulting trip relays at all incoming feeder that gets supply voltage of the incoming. So it takes coordination of overcurrent relay settings right so that the incidence of the incoming trip Sacred 2 does not happen again . Keywords: distribution, protection, relay settings, incoming, outgoing
RANCANG BANGUN ALAT PEMANTAUAN PENGATURAN KECEPATAN PUTAR MOTOR DC POWER WINDOWS BERBASIS PLC PANASONIC MENGGUNAKAN HUMAN MACHINE INTERFACE (HMI) Anarwati, Agustin; Setiono, Iman
Gema Teknologi Vol 19, No 3 (2017): April 2017 - October 2017
Publisher : Vocational School Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (486.303 KB) | DOI: 10.14710/gt.v19i3.21883

Abstract

Agustin Anarwati, Iman Setiono, today human life is very rapidly developing, one of them in the field of technology as time advances. This requires the creation of ideas to make a variety of equipment that is more practical and more reliable in meeting needs. In the industrial world today, most equipment uses PLC as a controller for various existing equipment, while the Human Machine Interface (HMI) is used to simplify monitoring existing equipment. In the automotive world, the power windows system is part of the body's electrical circuit which aims to make it easier for motorists to operate car windows. The driver can adjust the work of the power windows through a switch. When the driver presses the switch then the motor power window will rotate and will make the window work both open and close. The type of motor used in the power window system is a DC motor. One of the features of this DC motor is its speed can be controlled easily. In this case, I tried to make the design of the monitoring device setting the DC power speed of the windows power using PLC and HMI as monitors and controllers for operating the DC power windows rotating speed to make it easier, the speed can be adjusted through the output voltage from the PLC to the driver, starting from 0 VDC up to 5 VDC. if the voltage is 5 VDC then the motor will rotate with a maximum speed of 100%, whereas if given a 2.5 VDC input, the motor speed will be half of the 5 VDC rotational speed.

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