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All Journal Journal of Electrical Technology UMY JOURNAL OF ELECTRICAL AND SYSTEM CONTROL ENGINEERING Jurnal SOLMA Jurnal Rekayasa Material, Manufaktur & Energi RELE: Rekayasa Elektrikal dan Energi Jurnal Teknik Elektro EKSAKTA : Jurnal Penelitian dan Pembelajaran MIPA JAREE (Journal on Advanced Research in Electrical Engineering) Jurnal Rekayasa elektrika
Siregar, Rahmat Fauzi
Department Of Electrical Engineering, Faculty Of Engineering, Universitas Muhammadiyah Sumatera Utara
Aerospace Engineering Agriculture, Biological Sciences & Forestry Computer Science & IT Control & Systems Engineering Education Electrical & Electronics Engineering Energy Engineering Library & Information Science Other

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Human-Robot Interaction Based GUI Rahmat Fauzi Siregar; Ramadoni Syahputra; Muhamad Yusvin Mustar
Journal of Electrical Technology UMY Vol 1, No 1 (2017)
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/jet.1102

Abstract

Nowadays, technological developments interactions in general, couldn't be separated from the rapid development of computer technology and human interaction. So that, supporting the user to be able to develop various models of interactions, especially the interactions between humans and robots. This study proposes a model of design and manufacture of human and robot interaction, in the form of a visual display on a computer controlling the robot motion. Object interaction in this study is using 4WD Smart Car Robot. Some of the tools used to build a robot control system at the time of interaction, including Netbeans IDE, based on JAVA and Arduino. The control algorithm is applied to build an optimal control system to model an interaction between humans and robots. Model of human interaction and robot is fully carried by the user in control of robot motion. The proposed interaction model can be implemented in real terms, in designing and making a model of human interaction and robot. 
Development of pH Sensing Devices Based on Optical Fluorescents with Rapid Measurement, Low Cost and Wireless Monitoring Rahmat Fauzi Siregar; Totok Mujiono
JAREE (Journal on Advanced Research in Electrical Engineering) Vol 4, No 2 (2020): October
Publisher : Department of Electrical Engineering ITS and FORTEI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25796216.v4.i2.126

Abstract

The level of acid or base in water based on solution (pH) is a very important measure for living things because about 70% in the body consists of water. Most of the metabolism in the body requires a certain pH level. Having a rapid and accurate pH meter is very demanding, but most of the available pH meters take several minutes to measure the pH of the liquid. The measured water is mixed with fluorescent liquid and then excited with violet light at a wavelength of 405 nm. We have developed a pH meter based on optical fluorescent using pyranine extracted from yellow highlighter using isopropyl alcohol. The pH meter based on optical fluorescent have advantage compared to other methods in terms of measurement time. The intensity of the green fluorescent emitted from the liquid sample is then captured by the AS7262 spectral sensor. A pH sensing device has been developed, tested and verified to be able to measure pH from a range of 4 to 11 with an accuracy of 98.13%, a reading error value of ±0.13 and only takes less than 3 seconds to take measurements.Keywords: fluorescent, pH sensor, pyranine.
Analisis Sistem Monitoring Suhu Dan Kelembaban Berbasis ATmega8535 Benny Oktrialdi; Partaonan Harahap; Muhammad Adam; Rahmat Fauzi Siregar
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Publisher : RELE (Rekayasa Elektrikal dan Energi) : Jurnal Teknik Elektro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30596/rele.v5i2.13086

Abstract

Abstrak Kemajuan teknologi saat ini mendorong era modernisasi yang membawa manusia pada kemajuan iptek yang dapat menciptakan alat yang dapat membantu dan mempermudah kerja manusia dalam melakukan aktivitas sehari-hari maupun kegiatan yang rutin, sehingga menghasilkan hasil yang maksimal sistem monitoring suhu, kelembaban dan tekanan udara jenis sensor DHT11 yang digunkan sebagai sensor untuk mendeteksi temperatur dan kelembaban, sensorr BMP.085 untuk mengukur nilai atau besaran tekanan udara disekitar lingkungan yang kemudian dibaca dan diproses oleh Arduino Uno yang berbasis Mikrokontroler Atmega 328, dalam pengujiannya alat ketika sensor DHT11 bekerja maka program Lcd akan menampilkan keterangan suhu dan kelembaban, perancangan ini dibuat untuk memudahkan menstabilkan suhu pada kandang bebek. pengukuran hari pertama hasil pengukuran suhu dan kelembapan pada sensor DTH11 didapat rata-rata suhu sebesar 31? dengan kelembaban rata-rata sebesar 72 % sedangkan pada hasil pengukuran suhu dan kelembapan di hari kedua pada sensor DTH11 didapat rata-rata suhu sebesar 29? dengan kelembaban rata-rata sebesar 75 %. Hal ini menunjukan perubahan suhu dan kelembaban ada kandang bebek tersebut.Kata kunci : Perancangan, Pengukuran, Suhu, ATmega8535, Sensor DHT11Abstract Advances in technology are currently driving the era of modernization which brings people to advances in science and technology that can create tools that can help and facilitate human work in carrying out daily activities and routine activities, so as to produce maximum results monitoring systems for temperature, humidity and air pressure sensor type DHT11 is used as a sensor to detect temperature and humidity, BMP.085 sensor to measure the value or amount of air pressure around the environment which is then read and processed by Arduino Uno based on Atmega 328 microcontroller, in testing the tool when the DHT11 sensor works, the LCD program will display information on temperature and humidity, this design was made to make it easier to stabilize the temperature in the duck coop. the first day of measurement of the results of temperature and humidity measurements on the DTH11 sensor obtained an average temperature of 31 ? with an average humidity of 72% while the results of temperature and humidity measurements on the second day on the DTH11 sensor obtained an average temperature of 29 ? with humidity an average of 75%. This shows changes in temperature and humidity in the duck pen. Keywords : Design, Measurement, Temperature, ATmega8535, DHT11 Sensor
IoT Smart Control System: Smoke and Fire Detection Using SIM900A Module Rahmat Fauzi Siregar; Affandi Affandi; Rohana Rohana; Arya Rudi Nasution; Iqbal Tanjung
Journal of Electrical Technology UMY Vol 7, No 2 (2023): December
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/jet.v7i2.19908

Abstract

The main focus of this system is to detect smoke and fire effectively in potential hazard situations. This system utilizes sensor technology to monitor changes in environmental conditions, with the aim of providing quick responses and notifications to users or relevant authorities via a cellular connection. This approach combines feedback signals from sensors and cellular connectivity using the SIM900A module processed with a microcontroller to increase the efficiency and reliability of hazard detection. This system was designed with the aim of providing an efficient and affordable solution for detecting potential fires or other hazardous situations in various environments, including homes, offices and industrial areas. Trial results show that this system is capable of detecting smoke and fire with high accuracy, as well as providing instant notifications via text messages or digital notifications. This innovation is expected to make a positive contribution in improving safety and security in various sectors, while leveraging the potential of IoT connectivity to provide smarter solutions in hazard detection.
Fuzzy Logic Mamdani-Based Simulation of Solanum Lycopersicum Fruit Sorter to Produce High-Quality Fruit Products Siregar, Rahmat Fauzi; Affandi; Nasution, Arya Rudi; Hasanul Arifin; Harahap, Muhammad Alwi Ripay
JOURNAL OF ELECTRICAL AND SYSTEM CONTROL ENGINEERING Vol. 8 No. 1 (2024): Journal of Electrical and System Control Engineering
Publisher : Universitas Medan Area

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31289/jesce.v8i1.11835

Abstract

This research presents a novel approach utilizing Fuzzy Logic Mamdani-based simulation implemented through MATLAB and SolidWorks for sorting Solanum Lycopersicum fruits to achieve premium fruit quality. By integrating advanced computational tools, the simulation emulates intricate sorting processes, enabling precise decision-making akin to human judgment. This innovative methodology offers a promising avenue for improving fruit sorting efficiency and product quality in agricultural industries. This simulation system uses loadcell sensors, color sensors and PIR sensors as input. These inputs are used to control three servos and one DC motor. The fuzification process is carried out on both the input and output sides. Based on the results of the fuzification process, eighty-one rules were obtained and a fuzzy inference process was carried out using the intersection method. After carrying out the fuzzy inference process, it is continued with the defuzzification process. The result of the defuzzification value on the quality output is 7324.99 in the high set and the result of the simulation of the quality output value is 7250 in the high set. Thus, the accuracy level of the simulation's results is 98.98%. The simulation results show that the system is able to sort low, medium and high quality Solanum lycopersicum fruit.
DESIGN OF A 4 BAND COLOR CODE RESISTOR CALCULATOR APPLICATION BASED ON THE JAVA PROGRAMMING LANGUAGE Siregar, Rahmat Fauzi; Al-Khowarizmi, AK; R, Rohana; A, Affandi; Nasution, Arya Rudi
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Publisher : RELE (Rekayasa Elektrikal dan Energi) : Jurnal Teknik Elektro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30596/rele.v6i2.17251

Abstract

This research aims to design and develop a 4 band resistor color code calculator application based on the Java programming language. This calculator is designed to help electronics technicians identify resistor values based on the color code found on 4 band resistors. This application provides an intuitive and user-friendly interface that allows users to enter the color of each band on a resistor and quickly displays the corresponding resistance value. Apart from that, this application can also provide the tolerance of a given resistor. The development method used in this research includes needs analysis, user interface design, implementation of resistance value calculation algorithms, and application testing. This application is implemented using the Java programming language and supported by the JavaFX graphic library to create an attractive interface. Test results show that this application can calculate resistance values accurately and is responsive to user input. With this application, it is hoped that users can easily and quickly identify the resistance value of 4 band resistors, increase efficiency in their work, and reduce the possibility of errors in deciphering resistor color codes.
Pengembangan Trainer KIT Mikrokontrol Arduino Uno Berbasis IOT sebagai Media Penunjang Pembelajaran Sistem Kontrol Terprogram Oktrialdi, Benny; Harahap, Partaonan; Affandi; Fauzi, Rahmat; Nasution, Arya Rudi; Faisal, Ade
Jurnal SOLMA Vol. 14 No. 1 (2025)
Publisher : Universitas Muhammadiyah Prof. DR. Hamka (UHAMKA Press)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22236/solma.v14i1.17855

Abstract

Background: Learning media training is one of the important factors in improving learning outcomes, with learning media that suits the needs, especially students of SMK Teknologi Yayasan Pendidikan Sinar Husni can understand learning. The purpose of the implementation of the community partnership program (PKM) is to produce interactive learning media that is valid, practical and effective to help students of SMK Teknologi master the field of Electronics and Control. Method: The method for implementing Community Partnership Service activities for SMK Teknologi Yayasan Pendidikan Sinar Husni, Department of Electrical Engineering / Electricity, is by first making observations to the location of the School where the Community Service is held, as well as sharing with several Electrical Engineering teachers.  This is done to identify service methods that are in accordance with the conditions of the Community Partnership Service Team Partners in the field, so that later it will be right on target. Result: This activity can make and understand basic Arduino Uno learning media and implement it well. Conclusion: It is hoped that in the future this activity can inspire and motivate the participants and can innovate in the development of science and technology in the world of Electronics and Control Instrumentation to support the Industrial Revolution 4.0 program.
Effect of Spindle Speed on the Bending Test of Al-1100 in Fraction Stir Welding Joints Bintoro, Suryanto Agung; Nasution, Arya Rudi; ., Affandi; Siregar, Rahmat Fauzi; Harahap, Jagodang
Rekayasa Material, Manufaktur dan Energi Vol 8, No 2: JULI 2025
Publisher : Fakultas Teknik UMSU

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30596/rmme.v8i2.25522

Abstract

Currently, in the industrial world, many products or components are required to have strong but light properties. Therefore, aluminum material is increasingly being chosen as the main material in the industrial production process. Aluminum and its alloys are classified as light metals that have high strength, corrosion resistance, fairly good electrical conductivity, and are lighter than iron or steel. However, aluminum has a weakness in its welding ability which is not good when compared to other metals. This problem can be overcome by the Solid-State Welding (SSW) welding method. SSW itself is a welding process carried out when the metal is still solid, meaning that the metal does not melt. One of the SSW methods that is often used is Friction Stir Welding (FSW), which is a solid-state welding technology that is very suitable for joining materials such as aluminum. FSW does not require additional materials, but instead utilizes the heat from friction between the probe and shoulder of the welding tool with the surface of the workpiece. This research on Friction Stir Welding aims to determine the effect of variations in feed rate on the strength of 1100 aluminum joints through tensile tests. The pin tool used is made of carbide, cylindrical in shape with a length of 100 mm and a diameter of 3 mm. The test specimen used was aluminum 1100 with a thickness of 3 mm, a length of 200 mm, and a width of 20 mm, and was made into 9 samples. The FSW welding process and the manufacture of test specimens were carried out according to the ASTM E8 standard. During the welding process, the pin tool rotated at 2200 Rpm, and the feedrates used were 50 mm/min, 100 mm/min, and 150 mm/min. After welding, a tensile test was carried out on the FSW joint results. There were nine tensile tests, with each feedrate parameter tested on three samples. The average tensile strength of the FSW joint on a 2200 Rpm spindle with a feedrate of 50 mm/min was 12.34 MPa, at a feedrate of 100 mm/min was 21.53 MPa, and at a feedrate of 150 mm/min was 29.21 MPa.
ANALISIS MISKONSEPSI PADA MATERI FISIKA DI KOTA PADANGSIDIMPUAN Elisa, Elisa; Sri Rezeki, Happy; Ginting, Nurmaini; Rusdi, Muhammad; Siregar, Rahmat Fauzi; Masroito, Masroito
Eksakta : Jurnal Penelitian dan Pembelajaran MIPA Vol 10, No 2 (2025): Eksakta : Jurnal Penelitian dan Pembelajaran MIPA
Publisher : Fakultas Keguruan Dan Ilmu Pendidikan, UM-Tapsel

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31604/eksakta.v10i2.1-7

Abstract

This study aims to identify subject matter that still experiences misconceptions among students. Interviews were conducted with a number of teachers from several high schools in Padangsidimpuan city, namely SMA Negeri 2, SMA Negeri 6, and SMA Negeri 7 Padangsidimpuan. The sampling technique used was random sampling. This study used a descriptive method, and the data was analyzed descriptively as well. In SMA Negeri 2 Padangsidimpuan, as many as 54.54% of students experienced misconceptions on the material of Newton's Third Law which was classified as a high category. For Thermodynamics material, the level of student misconceptions reached 31.74% with a moderate category. Misconceptions on Quantum Physics material were at 8.48% (low category), while for the Concept of Motion it was 5.24% also with a low category. In SMA Negeri 6 Padangsidimpuan, the percentage of students who experienced misconceptions on Newton's Third Law reached 58.02% (high category). Meanwhile, in Thermodynamics material, it is only 2.72% (low category), Quantum Physics is 7.52% (low category), and Motion Concept is 31.74% (medium category). Meanwhile, in SMA Negeri 7 Padangsidimpuan, students who experience misconceptions in Newton's Third Law are 50.63% (high category). For Thermodynamics material, the percentage is 31.74% (medium category), Quantum Physics is 8.48% (low category), and Motion Concept is 5.24% (low category).
Optimizing Light Detection with Photodiode Sensor Arrays using Linear Regression Siregar, Rahmat Fauzi; Mustar, Muhamad Yusvin; Affandi, Affandi; Nasution, Arya Rudi; Br. Sembiring, Adelia Febrina
Jurnal Rekayasa Elektrika Vol 21, No 3 (2025)
Publisher : Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17529/jre.v21i3.42384

Abstract

Photodiode sensors are widely used in various applications such as light intensity measurement, optoelectronic devices, and automation. In improving the quality of measurement and automation systems, more sophisticated technology is needed such as photodiode sensor arrays, which allow more accurate data collection from multiple sensors simultaneously. This research aims to design a photodiode sensor array with high sensitivity. The system design consists of six photodiode sensors combined with a summing amplifier circuit and a non-inverting amplifier as a signal conditioner which is then processed by a microcontroller. After that, the linear regression function is determined through the calibration process and experiments carried out. Two linear regression functions are obtained and implemented in two operating modes: normal mode and sensitive mode. Experimental results yield two linear regression functions applied to a photodiode sensor array in normal and sensitive modes. Normal mode shows 82.50% accuracy with a 36.69% coefficient of variation, while sensitive mode boasts 94.05% accuracy and 49.81% coefficient of variation. Both modes cater to different light conditions, with sensitive mode excelling in detecting light intensity. Linear regression implementation proves precise and accurate for light detection.
Co-Authors Adam, Muhammad Ade Faisal, Ph.D Affandi Affandi Al-Khowarizmi, AK Arya Rudi Nasution Benny Oktrialdi Bintoro, Suryanto Agung Br. Sembiring, Adelia Febrina Elisa Elisa Harahap, Jagodang Harahap, Muhammad Alwi Ripay Harahap, Partaonan Hasanul Arifin Iqbal Tanjung Masroito, Masroito Muhamad Yusvin Mustar Muhammad Rusdi Mustar, Muhamad Yusvin Nurmaini Ginting Oktrialdi, Benny Partaonan Harahap R, Rohana Ramadoni Syahputra Rohana Rohana Sri Rezeki, Happy Totok Mujiono, Totok