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All Journal Jurnal Edukasi Elektro Teknika TELKOMNIKA (Telecommunication Computing Electronics and Control) Bulletin of Electrical Engineering and Informatics JURNAL ELEKTRO Techne : Jurnal Ilmiah Elektroteknika Elektrika Jurnal Sistem Cerdas Jurnal Mantik Jurnal Pengabdian kepada Masyarakat Nusantara Jurnal Nasional Teknik Elektro dan Teknologi Informasi Magistrorum et Scholarium: Jurnal Pengabdian Masyarakat Jurnal Elektronika dan Telekomunikasi
Budihardja Murtianta
Universitas Kristen Satya Wacana
Agriculture, Biological Sciences & Forestry Humanities Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Social Sciences

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Streamlined A* for Faster Robotic Inspections in Ports Hartanto Kusuma Wardana; Rumaksari, Atyanta; Prischa Wilhelmina Picanussa; Budihardja Murtianta; Adri Sooai; King Harold Recto
Jurnal Sistem Cerdas Vol. 7 No. 2 (2024)
Publisher : APIC

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37396/jsc.v7i2.416

Abstract

Research on automatic port inspections using robots has been carried out in the state-owned company Indonesia Port Corporation, Semarang, Indonesia. However, increasing the efficiency of robotic inspections is critical because robots need to perform these tasks at much higher speeds than humans, while maintaining a high level of accuracy. The robot is equipped with sensors and computer vision technology to detect defects or problems that humans might miss. The aim is to increase overall inspection accuracy at a lower cost. In this research, we introduce an optimized A* path planning algorithm that incorporates the flood algorithm, node reductions process, and linear path planning optimization for an autonomous navigated port inspection robot. Our primary objective is to significantly increase the efficiency of the conventional A* algorithm in guiding robotic systems through complex paths. The proposed algorithm demonstrates exceptional efficiency in generating feasible paths, with success attributed to optimization steps that specifically target reducing node processing and enhancing route finding. The experimentation phase involves a comprehensive assessment of the algorithm using six key parameters: running time, number of nodes, number of turns, maximum turning angle, expansion nodes, and the total distances output. Through rigorous testing, the algorithm's performance is evaluated and compared against seven other current algorithms, namely A*, BestFirst, Dijkstra, BFS, DFS, Bidirectional A*, and Geometric A*. Results from the experiments reveal the algorithm's outstanding running time efficiency, surpassing all other algorithms tested. Notably, it exhibits a remarkable 6.5% improvement over the widely recognized Geometric A* algorithm.
Driver activity recognition using deep learning based on multi-step batch size up Utomo, Darmawan; Indria Prambodo, Natanael; Murtianta, Budihardja
Bulletin of Electrical Engineering and Informatics Vol 14, No 5: October 2025
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/eei.v14i5.9069

Abstract

The increasing popularity of electric motorbikes in Indonesia, while promoting sustainable mobility, also raises concerns regarding traffic safety. Given the high incidence of motorcycle-related accidents, there is a critical need for systems capable of monitoring and recognizing driver behavior. This study proposes a driver activity recognition system for electric motorbikes, utilizing an event data recorder (EDR) to capture seven key sensor signals: three-axis acceleration, voltage, current, power, and speed. A custom dataset was constructed using data collected from 10 subjects, each performing five driving activities including forward drive, brake, stop, left turn, and right turn for over three-minute intervals per activity. The classification model is based on a long short-term memory (LSTM) neural network. To optimize training efficiency, a multi-step batch size up (MSBU) strategy was introduced, which accelerates training time by 1.84× compared to a fixed batch size of 32. The best performance was achieved using a segment length of 75 time-steps, yielding an accuracy and macro F1-score of 0.9873. These results demonstrate the effectiveness of the proposed system for real-time driver behavior monitoring and activity recognition in electric motorbike applications.
PENGUAT KELAS D FREKUENSI TETAP ORDE 2 Murtianta, Budihardja; Susilo, Deddy
Jurnal Edukasi Elektro Vol. 6 No. 1 (2022): Jurnal Edukasi Elektro, Volume 6, Nomor 1, 2022
Publisher : DPTE FT UNY

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jee.v6i1.44196

Abstract

ABSTRACT:The power amplifier determines the output power of the audio amplifier and in this part there will be heat dissipation which is proportional to the output power of the amplifier. To overcome the problem of the audio amplifier, a class D amplifier was designed. The amplifier designed in this paper is Power Amplifier Class D Fixed Frequency Second Order that uses a fixed frequency triangular signal generator and an order 2 low-pass filter. In this case, a power amplifier is designed for a subwoofer that has a frequency range of 20 Hz – 200 Hz because in the audio frequency range it requires relatively large power. The design of the power amplifier and its measurement using the Circuit Maker simulator. The amplifier can work to amplify signals with a maximum amplitude of 1 Vp and a frequency range of 20 Hz – 200 Hz. At a frequency of 20 Hz the shape of the signal is not as good as that of the 200 Hz frequency signal because it is far from the cut-off frequency of the low - pass filter, which is designed to be 250 Hz.ABSTRAK:Penguat daya menentukan besarnya daya keluaran penguat audio dan pada bagian ini akan terjadi disipasi panas yang sebanding dengan besar daya keluaran penguat. Untuk mengatasi permasalahan penguat audio tersebut dirancanglah penguat kelas D. Penguat yang di rancang pada tulisan ini adalah Penguat Kelas D Frekuensi Tetap Orde Dua yang menggunakan pembangkit sinyal segitiga frekuensi tetap dan tapis pelewat frekuensi rendah orde 2. Dalam hal ini dirancang penguat daya untuk subwoofer yang mempunyai jangkauan frekuensi 20 Hz – 200 Hz karena pada jangkauan frekuensi audio tersebut memerlukan daya relatif besar. Perancangan penguat daya dan pengukurannya menggunakan simulator Circuit Maker.  Penguat dapat bekerja memperkuat sinyal dengan amplitudo maksimum 1 Vp dan jangkauan frekuensi 20 Hz – 200 Hz. Pada frekuensi 20 Hz bentuk sinyal tidak sebaik  bentuk sinyal frekuensi 200 Hz karena jauh dari frekuensi penggal tapis pelewat frekuensi rendah yaitu dirancang 250 Hz.
Pengajaran Elektronika Praktis bagi Siswa SMK Negeri 2 Salatiga Murtianta, Budihardja; Santika, Maria; Sabatino, Demas; Fuadi, Ihsan; Galih Samudra, Ananditya
Jurnal Pengabdian kepada Masyarakat Nusantara Vol. 5 No. 3 (2024): Jurnal Pengabdian kepada Masyarakat Nusantara (JPkMN) Edisi Mei- Agustus
Publisher : Lembaga Dongan Dosen

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55338/jpkmn.v5i3.3567

Abstract

Pemanfaatan big data, Internet of Things (IoT), robot, dan sistem komputasi awan adalah tanda revolusi industri 4.0 yang sedang berlangsung di seluruh dunia. Masyarakat diharapkan dapat beradaptasi dengan inovasi dan perubahan ini melalui keterampilan inovatif dan pelatihan dasar elektronika yang menunjang kemampuan Sumber Daya Manusia (SDM). Berdasarkan hal tersebut maka pengajaran elektronika praktis dilakukan untuk siswa SMK Negeri 2 Salatiga yang sedang melakukan tugas kerja lapangan di Fakultas Teknik Elektronika dan Komputer. Materi ajar dibuat berdasarkan kebutuhan peserta serta diberikan dengan presentasi kemudian peserta diajak untuk melakukan praktik berdasarkan materi yang telah diberikan. Materi-materi tersebut antara lain adalah materi catu daya dan materi energi baru. Setelah melakukan serangkaian kegiatan pengajaran dan praktik, siswa peserta diberikan kuisioner mengenai kepuasan selama pembelajaran sebagai bentuk evaluasi kegiatan ini. Hasil yang didapatkan adalah lebih dari 80% siswa merasa puas dengan materi kegiatan yang telah diberikan. Hasil ini menunjukkan hasil yang baik didukung dengan antusiasme siswa yang baik selama kegiatan berlangsung.
Power Regulator Design Using LM317 for Precise and Efficient Power Management Budihardja Murtianta; Atyanta Nika Rumaksari
Jurnal Elektronika dan Telekomunikasi Vol. 24 No. 2 (2024)
Publisher : National Research and Innovation Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55981/jet.632

Abstract

The Indonesian government plans to transition its transportation sector to electric vehicles (EVs) by 2025. Achieving this ambitious target will necessitate advancements in power management technologies. Therefore, the government is boosting research on energy efficiency, cutting power dissipation, and enhancing the reliability and lifespan of EV components. This study focuses on designing a power-efficient linear voltage regulator using the LM317, which is essential for EV power management. The regulator employs a voltage comparator to monitor feedback voltage and select the correct input voltage, ensuring efficient and stable output power. We tested the LM317 against the LM338 and LM350 in various setups. The results showed that the LM317 performed better in terms of voltage precision, efficiency, power dissipation, and temperature stability. Moreover, the LM317 achieved 75% efficiency in single-source setups and 85% in multi-source configurations, with a voltage precision of ±0.1%. The system’s ability to dynamically select input sources ensures optimal performance for small-signal EV applications.
Implementasi Sensor Ultrasonic Pada Sistem Pengontrol Volume Air dan Pembaca Debit Air Berbasis IoT Jevan Farica; Budihardja Murtianta; Demas Sabatino
Jurnal Elektro Vol 19 No 1 (2026): Jurnal Elektro : April 2026
Publisher : Prodi Teknik Elektro, Fakultas Teknik Unika Atma Jaya Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25170/jurnalelektro.v19i1.7206

Abstract

This system designs a non-intrusive water flow rate reader and volume controller based on a clamp-on transit-time ultrasonic flow meter (V-mount, 4-inch pipe) using the TUF-2000M, integrated with an ESP32. The time-of-flight difference is converted into velocity, flow rate is calculated (Q = v·A), and volume is estimated through integration. The volume controller stops the flow precisely at set points of 2, 4, and 6 liters to minimize overshoot. The Blynk IoT platform provides a remote interface for set point selection and real-time monitoring (flow rate, velocity, fluid sound). Performance is evaluated based on volume error, set point achievement time, and repeatability, with quick installation and minimal pressure loss. The ESP32 microcontroller serves as the controller and data processor, supported by a relay module to control the solenoid valve's open or closed state. Testing results show a 4% error for 2 liters (within a 10% error limit), a 0.10% error for 4 liters (within a 10% error limit), and a 2.5% error for 6 liters (within a 10% error limit).
Class-G series audio power amplifier for subwoofer Budihardja Murtianta; Darmawan Utomo; Atyanta Nika Rumaksari; Jae-Wook Lee
TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 22, No 5: October 2024
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/telkomnika.v22i5.25900

Abstract

An audio power amplifier is an electronic device used to amplify a small signal source power at the input into a large signal power at the output that is speaker. In general, audio power amplifiers use class-AB amplifiers. In the process of amplifying the signal power, there will be power losses in the amplifiers which results in relatively lower amplifier power efficiency because there is a difference between the supply and output voltage levels. In this paper a class-G series audio power amplifier for subwoofers is designed to minimize these power losses and increase the power efficiency of the amplifier. The designed amplifier voltage supply is 40 V with a maximum output power of 80 W at an 8 Ω load. The amplifier has frequency response from 20–200 Hz and gain twice. Realization of the power amplifier and measurements were carried out using the circuit maker simulator, and the measurement results of the class-G power amplifier were compared with the class-AB power amplifier. The measurement results show that both power amplifiers meet the design specifications. The proposed class-G amplifier has 0.14% larger total harmonic distortion (THD) but has 10.4% greater power efficiency advantages over the class-AB amplifier.
Prototipe Sistem Pemantauan Beban Jembatan menggunakan ESP32 dan Load Cell dengan Integrasi Blynk Yohanes Evalex Cahyo Lobwaer; Budihardja Murtianta; Demas Sabatino
Jurnal Elektro Vol 18 No 2 (2025): Jurnal Elektro: October 2025
Publisher : Prodi Teknik Elektro, Fakultas Teknik Unika Atma Jaya Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25170/jurnalelektro.v18i2.7203

Abstract

Infrastruktur seperti jembatan memiliki peran penting dalam konektivitas sebuah wilayah. Pemantauan pada jembatan dengan cara meninjau dan menjamin keselamatan pengguna jembatan serta mengantisipasi kerusakan struktural secara real-time berbasis Internet of Think. Perancangan sistem ini menggunakan load cell (sensor beban) untuk pengukuran beban, ADXL345 (sensor akselerometer) untuk pengukuran getaran, algoritma Fast Fourier Transform (FFT) untuk analisis sinyal getaran dalam domain frekuensi, aplikasi Blynk sebagai device pemantauan real-time. Pengujian dilakukan pada 2 kondisi permukaan jalan, yaitu jalan rusak dan jalan normal dengan menggunakan load cell dan ADXL345 dan menghasilkan rata-rata error beban rendah yang sesuai dengan datasheet, yaitu 0,01% dan dapat mendeteksi kondisi permukaan jalan dengan baik. Sistem ini mempermudah untuk pemantauan kondisi jembatan dan meningkatkan efisien anggaran dan waktu.
Evaluasi Kinerja Sensor Proximity Induktif sebagai Alternatif Pengganti RFID pada Prototipe Rail Guided Vehicle Berbasis Arduino Maria Enggar Santika; Muhamad Prasetyo Dwi Nugroho; Budihardja Murtianta
TEKNIKA Vol. 19 No. 2 (2025): Teknika Mei 2025
Publisher : Politeknik Negeri Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5281/zenodo.15435527

Abstract

Teknologi Rail Guided Vehicle (RGV) merupakan salah satu solusi otomasi transportasi material dalam lingkungan industri yang membutuhkan sistem navigasi dan identifikasi jalur secara presisi. Umumnya, sistem ini memanfaatkan Radio Frequency Identification (RFID) sebagai media deteksi posisi. Namun, penggunaan RFID memiliki beberapa kendala antara lain interferensi sinyal pada area dekat dengan logam serta kompleksitas saat diaplikasikan pada dunia industri yang beragam. Penelitian ini bertujuan untuk mengevaluasi kinerja sensor proximity induktif sebagai alternatif pengganti RFID dalam mendeteksi posisi pada prototipe RGV berbasis mikrokontroler Arduino. Pengujian dilakukan melalui serangkaian skenario pergerakan RGV pada lintasan dengan beberapa titik deteksi. Hasil penelitian menunjukkan bahwa sensor proximity induktif memberikan performa yang stabil dan akurat dengan mencapai rata-rata error sebesar 0,22 cm, yang lebih rendah dibandingkan dengan sensor RFID yang memiliki rata-rata error sebesar 0,56 cm serta tingkat akurasi deteksi terhadap objek logam di sepanjang rel RGV mencapai 98%.
PENGUAT KELAS D DENGAN METODE SUMMING INTEGRATOR Budihardja Murtianta
Elektrika Vol. 11 No. 2 (2019): Oktober 2019
Publisher : Universitas Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (828.547 KB) | DOI: 10.26623/elektrika.v11i2.1693

Abstract

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.
Co-Authors Adri Gabriel Sooai Adri Sooai Albert Tarra Wahyu Setiadi Andreas Ardian Febrianto Arivia Aurelia Devina P. Atyanta Nika Rumaksari Chatarina Umbul Wahyuni Darmawan Utomo Deddy Susilo Demas Sabatino Demas Sabatino Demas Sabatino Erlina Sari Eva Yovita Dwi Utami Fransiscus Dalu Setiaji Fuadi, Ihsan Galih Samudra, Ananditya Gloria Song Abimanyu Gunawan Dewantoro Handoko Handoko Hartanto Kusuma Wardana Indria Prambodo, Natanael J. P. Tirtayasa Jae-Wook Lee Jevan Farica King Harold Recto Lukas Bambang Setyawan Maria Enggar Santika Muhamad Prasetyo Dwi Nugroho Nabella Previana Yosinta Nathanael Adharta Livendra Murtianta Previana Yosinta, Nabella Prischa Wilhelmina Picanussa Rizky Salenda Stevano Danis Ronaldo Vinsensius R.S. Purnomo Yohanes Evalex Cahyo Lobwaer