Darjat Darjat
Jurusan Teknik Elektro, Universitas Diponegoro Semarang Jl. Prof. Sudharto, SH, Kampus UNDIP Tembalang, Semarang 50275, Indonesia

Published : 71 Documents
Articles

PERHITUNGAN WAKTU TUNDA PADA SISTEM RADAR SEKUNDER DENGAN MENGGUNAKAN METODE TDOA (TIME DIFFERENT OF ARRIVAL) Nainggolan, Paskah Handikardo Benjamin; Darjat, Darjat; Christoyono, Yuli
Transmisi Vol 13, No 1 (2011): TRANSMISI
Publisher : Departemen Teknik Elektro, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (406.731 KB) | DOI: 10.12777/transmisi.13.1.7-14

Abstract

The detection of the position and trajectory of the rocket is very necessary in order to launch a rocket capable of running as expected. If the position and trajectory of the rocket is not monitored properly, it could be bad. Therefore, the solution needed to be able to monitor the position and trajectory of the rocket with a specific technical studies. As an initial step in monitoring the position of the rocket is to know the time delay during the process send and receive signals between the sending station with a radio wave receiver. In this thesis, carried out a simulation application of TDOA-trilateration algorithm to compute the time delay on the secondary radar system. Techniques to get a distance that is by finding the difference between the send and receive signals between the transceiver station with a radio wave transponder. After setting on the transceiver and the transponder is set, by setting send data, protocol, and then it will be obtained automatically scanning the time delay is expected. This technique is called TDOA (Time Different Of arrival). This process will be simulated with MatlabaR2008a. Keyword : TDOA, time delay, rockets, radio, transceiver, transponder.
SISTEM PENGENDALIAN SUHU DAN KELEMBABAN PADA MESIN PENGERING KERTAS Darjat, Darjat
Transmisi Vol 10, No 2 (2008): TRANSMISI
Publisher : Departemen Teknik Elektro, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (393.697 KB) | DOI: 10.12777/transmisi.10.2.82-88

Abstract

An effective and efficient paper drying tool for printing industry is very important. Utilize of this tool is to dry the paper will be printed to get a dry paper that have ideal temperature and humidity level. With the result that will make easier the process of production and to get the optimal quality of printed result.Focus of this Final Report is to design data acquisition humidity level and temperature system control to the paper drying machine based on fuzzy logic control using Atmega 8535 microcontroller, in order to get the paper that have ideal temperature and humidity level is about 33oC ? 35.5oC and 41% of water content in 0.00075 inch of thickness for each of the sheet later  (Perry?s Chemical Engineers? Handbook: 12.34) 10].Observation result of fuzzy logic control in paper drying system show that bigger reference of temperature offered to the system so that the time to reach steady state condition will be more longer, where the initial condition of temperature at the same value. To get the dry ideal paper result, the setting reference of temperature that appropriate is 50oC, where the drying process with 50oC reference is resulted the paper with 38.0oC temperature and 40.9% of humidity.Keyword: Paper drying system, Fuzzy logic control, ATMega 8535 microcontroller
PEMANFAATAN TEKNOLOGI RFID UNTUK SISTEM MULTI AKSES MAHASISWA P, Arief Anthadi; S, Wahyul Amien; Darjat, Darjat
Transmisi Vol 15, No 1 (2013): TRANSMISI
Publisher : Departemen Teknik Elektro, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (393.415 KB) | DOI: 10.12777/transmisi.15.1.8-12

Abstract

Abstrak   Akses kontrol dapat dilakukan oleh personil seperti penjaga perbatasan, penjaga pintu, pemeriksa tiket, atau dengan perangkat seperti sebuah kunci (Lock). Namun ketika akses kontrol berupa seorang penjaga atau kunci manual mempunyai banyak keterbatasan, kontrol akses elektronik menggunakan sistem komputerisasi atau mirokontroler memecahkan keterbatasan tersebut. Sistem akses kontrol pintu  secara sederhana dipadukan dengan kunci (lock) saat ini telah dikembangkan seperti dipadu dengan sistem kartu (card) seperti  magnetic card, Smart Card, barcode card, dan RFID. RFID (Radio-Frequency IDentification). Dalam Penelitian ini akan dibahas mengenai pemafaatan dari teknologi RFID yang dipergunakan untuk sistem multi akses mahasiswa. RFID diaplikasikan pada kartu mahasiswa. Dengan menggunakan satu kartu,  mahasiswa  bisa mengakses tempat parkir, ruang laboratorium, dan atau melakukan absensi mahasiswa. Semua proses  divisualisasikan dengan tampilan simulasi. Kata kunci: : multi akses, RFID,tag,Reader     Abstract Access control can be done by personnel such as border guards, doormen, ticket checker, or with a device such as a lock. However, when the access control in the form of a guard or a manual lock has limitations, electronic access control using a computerized system or microcontroler solve these limitations. Access control system combined with a simple door lock (lock) has now developed such systems combined with the card (card) such as magnetic cards, Smart cards, barcode cards, and RFID, and then use a system such as fingerprint biometric (fingerprint), face (face), or the retina. RFID (Radio-Frequency Identification) is a wireless technology that favored compact to transform the commercial world. As the successor of the barcode, RFID can perform automatic control for a lot of things In this research will be discussed on pemafaatan of RFID technology used to access multiple systems students. RFID is applied to the student card. By using the card, students can access the parking, laboratory, and student attendance. All processes are visualized with a view simulations. Keywords: multi akses, RFID,tag,Reader
PENGEMBANGAN SISTEM KONTROL NAVIGASI KURSI RODA CERDAS MENGGUNAKAN ARSITEKTUR SUBSUMPTION STUDI KASUS DOOR PASSING DAN CORRIDOR FOLLOWING Setiawan, Iwan; Darjat, Darjat; Gusman Namara, Rano
Transmisi Vol 10, No 3 (2008): TRANSMISI
Publisher : Departemen Teknik Elektro, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1202.077 KB) | DOI: 10.12777/transmisi.10.3.113-118

Abstract

Several research have shown that both children and adults benefit substantially from access to a means of independent mobility. While the needs of many individuals with disabilities can be satisfied with traditional manual wheelchairs, a segment of the disabled community finds it difficult or impossible to use wheelchairs independently. To accommodate this population, researchers have used technologies originally developed for mobile robots to create "smart wheelchairs." Smart wheelchairs have been the subject of research since the early 1980s. Our goal in this project is to develop a smart wheelchair with a human friendly interface for high-level controlThere are two main capability that we embedded in this wheelchairs (1) Obstacle avoidance and (2) Door passing. From the experiment result,those capability seems to be work, but there must be enchanment due to  wheelchairs comportability.Keywords  : Kursi Roda Cerdas, Arsitektur Subsumption, Joystick, Sensor UltrasonikPermalink: http://ejournal.undip.ac.id/index.php/transmisi/article/view/1603
RANCANG BANGUN ALAT PENGUKUR TEKANAN DARAH OTOMATIS MENGGUNAKAN METODE OSCILLOMETRY BERBASIS RASPBERRY PI MODEL B+ Hendrayana, Yusuf H.; Riyadi, Munawar Agus; Darjat, Darjat
Transmisi Vol 18, No 1 Januari (2016): TRANSMISI
Publisher : Departemen Teknik Elektro, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (435.687 KB) | DOI: 10.12777/transmisi.18.1.38-42

Abstract

Alat ukur tekanan darah adalah peralatan instrumentasi medis yang umum digunakan pada diagnosa medis untuk menentukan penanganan medis selanjutnya pada pasien. Hasil pengukuran tekanan darah biasa ditunjukkan dalam systole per diastole dengan satuan milimeter raksa (mmHg). Systole mewakili tekanan darah tertinggi saat bilik jantung berkontraksi. Diastole mewakili tekanan darah terendah yaitu saat bilik jantung relaksasi. Penelitian ini berfokus pada perancangan sebuah instrumen noninvasive untuk mengukur tekanan darah dengan metode oscillometry otomatis. Sistem yang dirancang memanfaatkan Raspberry Pi Model B+ untuk pengolahan sinyal secara digital. Instrumen ini bertujuan mendapatkan tekanan darah systole, dan diastole serta heart beat rate (denyut jantung) penggunanya. Instrumen dirancang untuk mengukur tekanan darah dalam jangakauan 40 hingga 200 mmHg dan heart beat rate dalam jangkauan 0 sampai 300 bpm (beat per minute). Pada pengujian sistem, error rata-rata yang dihasilkan saat pengukuran adalah 4,39% untuk systole, 3,71% untuk diastole dan 7,32% untuk heart beat rate dibandingkan alat ukur tekanan darah FamilyDr TD-3124. Berdasarkan hasil ini, disimpulkan instrumen hasil perancangan dapat bekerja sesuai tujuan.
SISTEM INFORMASI AREA PARKIR BERBASIS MIKROKONTROLER ATMEGA 16 Anindita, Alfa; Sudjadi, Sudjadi; Darjat, Darjat
Transmisi Vol 15, No 3 (2013): TRANSMISI
Publisher : Departemen Teknik Elektro, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (298.856 KB) | DOI: 10.12777/transmisi.15.3.132-137

Abstract

Abstrak Proses penggunaan tempat parkir pada suatu area parkir masih menggunakan sistem konvensional atau sistem pada umumnya. Pengendara tidak dapat mengetahui secara langsung tempat parkir mana yang masih kosong ataupun yang digunakan sebelum memasuki area parkir.Sistem seperti ini kurang efisien bagi pengendara karena membutuhkan waktu yang cukup lama untuk menemukan tempat parkir yang digunakan.Penelitian tugas akhir ini menghasilkan sebuah alat yang digunakan untuk memberikan informasi area parkir.Alat inimemberikan informasi area parkir yang kosong secara up to date.Perancangan alat ini dilakukan dengan membuat perangkat keras dan perangkat lunak.Piranti keras yang digunakan adalah mikrokontroler ATMEGA 16 yang digunakan untuk memproses data.Sensor Ping Ultrasonik buatan Parallax.Dan untuk piranti keras pada bagian simulasi digunakan saklar on-off. Dan untuk hasil pendeteksian digunakan LCD dan led untuk menampilkan kondisi tempat parkir.   Kata kunci :area parkir, kendaraan, mobil     Abstract The process of using the parking area in a parking lot is still using the conventional system or the general system. Drivers were not able to directly identify if there any vacant parking space or used before entering the parking lot. Such systems are less efficient for drivers because it takes a long time to find a parking space that is used. This research resulted in a tool that is used to give parking lot information. This tool provides updated information of empty parking space. The design of this tool was to create hardware and software. The hardware that being used is ATMEGA 16 microcontroller used to process sensor data Ping Ultrasonic made by Parallax. And for the hardware used in the simulation is on-off switch. The detection results of parking lot condition are displayed on LCD and LED.   Key words : parking area, vehicle, car
PERANCANGAN APLIKASI PEMANTAU DAN PENGENDALI PIRANTI ELEKTRONIK PADA RUANGAN BERBASIS WEB Giant, Ragil Febrio; Darjat, Darjat; Sudjadi, Sudjadi
Transmisi Vol 17, No 2 April (2015): TRANSMISI
Publisher : Departemen Teknik Elektro, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (667.445 KB) | DOI: 10.12777/transmisi.17.2.70-75

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Abstrak Kebutuhan manusia akan sistem keamanan ruangan dapat berupa sistem pemantauan yang ditunjang melalui teknologi CCTV (Closed Circuit Television) yang terhubung komputer dan terintegrasi dengan penggunaan mikrokontroller dan dapat diprogram sesuai dengan kebutuhan, sebagai contoh selain dapat memantau ruangan tetapi juga bisa mengendalikan piranti elektronik di ruangan tersebut. Pada penelitian ini, dibuat perancangan sistem pemantau menggunakan webcam yang terintegrasi dengan penggunaan motor servo sehingga webcam dapat bergerak guna menambah variasi sudut pandang, serta juga terdapat sistem pengendalian piranti elektronik yang dirancang menjadi suatu aplikasi yang diakses menggunakan Web GUI dengan bantuan Raspberry Pi model B yang digunakan sebagai webserver. Raspberry Pi merupakan salah satu mikroprosessor yang biasa disebut sebagai mini komputer yang dapat digunakan dalam suatu sistem akses kontrol otomatis. Dengan menggunakan GPIO (General Purpose input output) pada Rasberry Pi, dapat diciptakan suatu sistem akses kontrol secara nirkabel, aman dan efektif. Dari hasil pengujian didapatkan program live streaming webcam pada halaman aplikasi, pengendalian arah webcam melalui web, dan pengendalian kontrol on-off piranti elektronik berupa lampu pijar melalui web memiliki tingkat keberhasilan 100% dari 10 kali percobaan.   Kata Kunci : Raspberry Pi, Pengendali Piranti Elektronik, Motor Servo, Web Camera     Abstract Human need for security system monitoring system space can be supported through technology CCTV (Closed Circuit Television) connected computer and integrated with the use of a microcontroller and can be programmed according to the needs, for example in addition to be able to monitor the room, but also can control electronic devices in the room . In this research, the monitoring system design using the integrated webcam with the use of a servo motor so that the webcam can be moved in order to increase the variety of viewsides, and there is also electronic device control system that are designed into an application and can be accessed using a Web GUI with the help of the Raspberry Pi model B used as a webserver. Raspberry Pi is one of the microprocessor that is commonly referred to as a mini computer that can be used in an automated access control system. By using GPIO (General Purpose Input Output) on Rasberry Pi, can be created by a system of wireless access control, safe and effective. From the test results obtained live streaming webcam program on the application page, control the direction of the webcam through the web, and on-off control of electronic devices such as lamp over the web has a success rate of 100 % of 10 attempts.   Keywords : Raspberry Pi, Electronic Devices Controller, Servo Motor, Web Camera
PERANCANGAN SISTEM KONTROL SIMULATOR PORTAL OTOMATIS JALUR BUSWAY MENGGUNAKAN METODE FUZZY-PID Triwiyatno, Aris; Widodo, Adrian Bela; Darjat, Darjat
Transmisi Vol 18, No 2 April (2016): TRANSMISI
Publisher : Departemen Teknik Elektro, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (568.94 KB) | DOI: 10.12777/transmisi.18.2.49-54

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Transjakarta atau yang lebih dikenal sebagai busway merupakan salah satu moda transportasi andalan masyarakat di wilayah ibukota Jakarta. Tingginya angka kecelakaan di jalur busway diakibatkan oleh ketidaktertiban pengguna kendaraan bermotor yang nekat menerobos jalur khusus bus transjakarta. Sterilisasi jalur busway seperti razia, pemasangan MCB (Moving Concrete Block), dan portal yang bersifat manual, merupakan solusi yang telah dilakukan untuk mengurangi permasalahan tersebut. Dalam penelitian ini dirancang sebuah simulator portal otomatis untuk melakukan sterilisasi jalur busway menggunakan sistem pengendalian Fuzzy-PID. Pembuatan sistem berbasis RFID ini dimaksudkan untuk membedakan kendaraan yang diperbolehkan melintasi jalur busway dengan membandingkan antara Kartu RFID yang terdeteksi dengan data ID bus dalam basis data. Pergerakan portal akan dikendalikan oleh kontrol Fuzzy-PID ketika sensor HC-SR04 mendeteksi jarak bus. Berdasarkan hasil pengujian diperoleh grafik respon sistem menggunakan metode kontrol Fuzzy-PID pada parameter pertama bersifat lebih linier dan memiliki waktu respon yang lebih cepat dibandingkan dengan parameter lainnya. Pada pengujian motor servo sebagai portal otomatis memiliki nilai RMSE total sebesar 0.248%. Pada pengujian keseluruhan sistem menggunakan kontroller Fuzzy-PID didapat respon yang paling stabil yaitu menggunakan nilai konstanta defuzifikasi Kp yaitu k1=25,  k2=30 , k3 = 45 sedangkan konstanta defuzifikasi Ki yaitu memiliki nilai k1=0.005 , k2=0.005, k3=0.005 dan pada defuzifikasi Kd memiliki k1=0.01 , k2=0.02 dan k3=0.03.
PEMETAAN POSISI DAN ORIENTASI KURSI RODA CERDAS BERBASIS PRINSIP DEAD RECKONING Setiawan, Iwan; Akrom, Isnan Fauzan; Darjat, Darjat
Transmisi Vol 11, No 2 (2009): TRANSMISI
Publisher : Departemen Teknik Elektro, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (157.086 KB) | DOI: 10.12777/transmisi.11.2.77-83

Abstract

Smart wheelchairs is a kind of assistive technology implementation from mobile robot field. The main purpose of the system is enhance disable people mobility and guaranteeing safety aspect while wheelchair navigate around domestic environment. As a kind of semi autonomous smart navigation system, the smart wheelchair must be accommodate share control between automatic controller and the user (via joystic). The ultimate goal of this research is to know exactly the position and orientation of smart wheelchair using dead reckoning principle. To fulfill the goal, the smart wheelchair is equipt by quadrature rotary encoder for each wheels.From the experiments that we drawn, we have get some result: Position and orientation error will be larger for long duration of operation of wheelchairs. Fundamentally, these kinds of error result from systematic and non systematic error source. Keywords: encoder, dead reckoning, state chart, komunikasi serial, smart wheelchair
PEWUJUDAN TAPIS DIGITAL FIR PEMILIH FREKUENSI MENGGUNAKAN DSK TMS320C6713 Erwin, Gidion; Hidayatno, Achmad; Darjat, Darjat
Transmisi Vol 12, No 1 (2010): TRANSMISI
Publisher : Departemen Teknik Elektro, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (496.81 KB) | DOI: 10.12777/transmisi.12.1.1-7

Abstract

Digital frequency selector filter is the simplest application of digital signal processing, in which process only passing signal with specific desired frequency or band frequency. Digital frequency selector filter can be implemented as software or hardware. In this final project, frequency selector filter is implemented as hardware using DSK (Digital Signal Processor Starter Kit)  TMS320C6713. In this final project, designed three type of  frequency selector filter : Low Pass Filter (LPF), High Pass Filter (HPF), and Band Pass Filter (BPF) with filter length (N) and cut-off frequency (Fc) variation. Filter coefficient is the final product of design stage. FDATool Matlab is used to help filter design and filter coefficient calculation. Then, this filter coefficient is implemented as digital filter in DSK TMS320C6713 using CCS (Code Composer Studio) v.3.1. In CCS, it is also arranged some source code to initialize internal peripheral device on DSK TMS320C6713 (Codec, McBSP, etc), initialize interrupt mode, and initialize memory mapping. Based on experiment?s result, it?s known that the implemented?s magnitude response  approriate with FDATool?s magnitude response (frequency selector filter algorithm was successfully implemented in DSK TMS320C6713). However, gain?s value at pass band region is not exactly 0 dB because resistance losses from cables and the low precision of measurement device. Based on experiment?s result, it?s also known that filter with higher filter length produces better magnitude response characteristics, especially narrower transition width characteristic. Keyword :   digital signal processing, digital filter, frequency selector filter, DSK TMS320C6713.
Co-Authors Achmad Chusnul Khuluqi Achmad Hidayatno Aditya Aditya Adrian Bela Widodo, Adrian Bela Afriandi Ferdinan Ahmad Siddik Prayogi, Ahmad Siddik Ajub Ajulian Zahra Ajub Ajulian Zahra Akbar Fitra Listyono, Akbar Fitra Akbar Kurnia Putra Alfa Anindita Aminuddin Rizal, Aminuddin andhika gabelly fadila pradana, andhika gabelly fadila Anton Ratrianto Arief Anthadi P Aris Triwiyatno Aulia Rahman B Devina Puspasari Bambang Hadiwijaya Budi Nugroho Budi Setiyono D Sukawati, Irawan Danang Septaditya Hidayat Syah, Danang Septaditya Danniswara, Satya Darmawan Darmawan Defriko Christian Dewandhika Eveline Eveline Fatkhurrahman, Muhammad Arief Firman Eka Saputra, Firman Eka Frans Scifo Gidion Erwin Hafrizal Lazuardi Susiawan Hanief Tegar Pambudhi Helmi Muhammad Shadiq Imam Santoso Imam Tri Baskoro Irawan Dharma S., Irawan Dharma Irawan Dharma Sukawati, Irawan Dharma Irvan Aditya Iskandar, Irvan Aditya Isnan Fauzan Akrom Iwan Setiawan Jayaningpang Kinantang, Jayaningpang Jefri Yandika Joanna Francisca Socaningrum Kurniahadi, Andra Listyono, A. F. M. Fuad Hasan M. Pramuaji Tri Saputro, M. Pramuaji Meisach Cristie Mizanul Haq, Mizanul Muhammad Aswan Muhammad Mirza Abdalla, Muhammad Mirza Munawar Agus Riyadi Mustikoaji, Yosia Gita Ngatelan Ngatelan Paskah Handikardo Benjamin Nainggolan Prayogi, A. S. R. Yudha Adi Pratama Ragil Febrio Giant Rano Gusman Namara Rg Setiawan S Ridwan Alief Rizka Hendrawan, Rizka Rony Darpono Saifuddin, Arief Saiful Anwar Sandi, Harum Amalia Septiaji Tri Wibisono, Septiaji Tri Sheila Nauvaliana Shulchul Chabib Achmad Sidiq Hidayatulah, Sidiq Sudjadi Sudjadi Sumardi Sumardi Susatyo Handoko Tedjo Sukmadi Teguh Aryanto Teguh Prakoso Thalib, Humaid Wahyul Amien S Wahyul Amien Syafei Yohannes, Hot Asi Yuli Christiyono Yuli Christoyono Yuli Christyono Yusuf H. Hendrayana, Yusuf H. Zaini Agung Utama Zeta Hanif Salindri, Zeta Hanif