Jurnal Rekayasa Elektrika
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Implementation of Event-Based Dynamic Authentication on MQTT Protocol
Get PDFThis paper proposes an authentication mechanism on the MQ Telemetry Transport (MQTT) protocol.The exchange of data in the IoT system became an important activity. The MQTT protocol is a fast and lightweightcommunication protocol for IoT. One of the problems with the MQTT protocol is that there is no securitymechanism in the initial setup. One security attack may occur during the client registration phase. The clientregistration phase has a vulnerability to accept false clients due to the absence of an authentication mechanism.An authentication mechanism has been previously made using Transport Layer Security (TLS). However, theTLS mechanism consumes more than 100 KB of data memory and is not suitable for devices that have limitations.Therefore, a suitable authentication mechanism for constraint devices is required. This paper proposes a protocolfor authentication mechanisms using dynamic and event-based authentication for the MQTT protocol. The eventbasedis used to reduce the computing burden of constraint devices. Dynamic usage is intended to provide differentauthentication properties for each session so that it can improve authentication security. As results, the applied ofthe event-based dynamic authentication protocol was successful in the constraint devices of microcontrollers andbroker. The microcontroller, as a client, is able to process the proposed protocol. The client uses 52% of the memoryfor the proposed protocol and only consumes 2% higher than the protocol without security. The broker can findauthentic clients and constraint devices capable of computing to carry out mutual authentication processes to clients.The broker uses a maximum of 4.3 MB of real memory and a maximum CPU usage of 3.7%
Perancangan Sistem Panel Surya Terkendali Dalam Dua Sumbu Untuk Peningkatan Efisiensi Pembangkitan Energi Listrik
Get PDFThe use of solar panels to get electrical energy from solar energy is one effort to utilize renewable energy resources. Solar panels (solar cells) are instruments that can convert the energy of sunlight into electrical energy. Solar panels are not only used in homes or in certain places, but also in large transport equipment such as cars and on ships. Solar panels are mostly installed in a stationary or static position. Whereas the direction of sunlight will change its angle relative to the surface of the solar panel. The change is increasingly irregular if the vehicle where the panel is located moves in the direction you want to go. Conditions like this cause the absorption of solar energy by solar panels to be less than optimal. In this research, a system has been designed where the solar panel was always controlled so that the direction of sunlight always falls perpendicular to the surface of the solar panel even though it was in a changing location and the direction of the sun's light on the earth's surface was always changing. Solar panels that can maneuver in two axes of motion were controlled by a microcontroller and two servo motors as actuators to adjust the position of the solar panel so that the surface was always perpendicular (following) the direction of sunlight. From the results of the tests, it turns out that solar panels in this research design can produce power 6.51% greater compared to static solar panels output
Pengukuran Speed dan Impedansi Akustik pada Tanah Liat dengan Memanfaatkan Sinyal Echo Ultrasonik
Get PDFEach material has its own characteristics, which are represented by the value of speed/ultrasonic wavepropagation speed (C) and acoustic impedance/material resistance (Ztl). One technique that can be used to obtainthese characteristics is by applying ultrasonic testing. This technique utilizes two ultrasonic sensors as transmitter(UST) and receiver (USR) to get signal properties from each material. The measurement mechanism is nondestructivetesting (NDT) where the material tested is not damaged so it does not change the character of the sample.In this research, material characteristics are represented by reflected signals from material (echo). To process theecho signal data and get the characteristics of the sample, we need a number of data processing algorithms such asFast Fourier Transform (FFT), Peak Detection, and Grid Search. By processing echo from reflected signals, C andZtl values can be obtained. From the experimental results obtained, the values of C and Ztl in sample 1 with a densityof 1856.97573 g/m3 are C = 636 m/s and Ztl = 474640 Ns/m3, samples 2 with a density of 1792.94208 g/m3 of C = 491m/s and Ztl = 408080 Ns/m3, while the sample 3 with a density of 1663.85025 g/m3 is C = 434 m/s and Ztl = 405639 Ns/m3. The value of material characterization shown that a dense clay also has higher C and Ztl
Prototipe Deteksi PEN dalam Tubuh Menggunakan B-Mode Ultrasonic Scanning
Get PDFInternal fixation is a method of healing fractures by connecting them using metal called pen. Pen metalin the body isnt permanent, when the bone was strong the pen must be removed to avoid infection. In finding thepen, X-Ray are usually used. But X-Ray has bad effect, so not everyone is allowed to use it. The solution given bymake prototype to detect pen location using B-Mode ultrasonic scanning method, it uses 5MHz single transducerultrasonic. Objects measurement is the animal bones connected with metals placed in the jelly with different heights.From the two transducers, the concave surface transducer has a better result and smaller percentage error than theflat surface transducer. The concave surface transducer has a focal length area 1.94cm above the transducer surface.The maximum slope angle of the object is 20o, which more than that makes the echo signal unreadable the object.The measurement results of objects displayed in the B-Mode 1 dimensional on PC that displays the structure of thebottom surface of an object, based on comparison between the actual object and the B-Mode display an error lessthan 6%, meaning B-Mode can represent the surface structure bottom of the actual object.Internal fixation is a method of healing fractures by connecting them using metal called pen. Pen metalin the body is not permanent, when the bone was strong the pen must be removed to avoid infection. In finding thepen, X-Ray are usually used. But X-Ray has bad effect, so not everyone is allowed to use it. The solution given bymake prototype to detect pen location using B-Mode ultrasonic scanning method, it uses 5MHz single transducerultrasonic. Objects measurement is the animal bones connected with metals placed in the jelly with different heights.From the two transducers, the concave surface transducer has a better result and smaller percentage error than theflat surface transducer. The concave surface transducer has a focal length area 1.94cm above the transducer surface.The maximum slope angle of the object is 20o, which more than that makes the echo signal unreadable the object.The measurement results of objects displayed in the B-Mode 1 dimensional on PC that displays the structure of thebottom surface of an object, based on comparison between the actual object and the B-Mode display an error lessthan 6%, meaning B-Mode can represent the surface structure bottom of the actual object
Modul Elektronika Berbasis Mikrokontroler sebagai Sistem Pengaman pada Mobil Terintegrasi dengan Engine Immobilizer
Get PDFAn electronic module based on the ATmega32 microcontroller as a security system for cars that integratedinto the engine immobilizer has been created. Three main things in this study, namely programming and verificationtests, making an initial security system with a minimalist structure, and validation tests. Programming for themicrocontroller system through algorithm determination and syntax writing, while the verification test is donethrough uploading the program syntax to the Proteus application and implementing the simulation. Determiningthe algorithms and writing the syntax through a number of steps, namely pin configuration, variable declarations,constant declarations, initialization, main programs, retrieve and send data, and output. The simulation assisted bythe Proteus application is in the form of giving two kinds of commands/inputs to the sensor, namely one input datain the form of human existence or human motion to the passive infrared receiver sensor and one input of humanfingerprint initialization data to the fingerprint sensor. The simulation results according to the order of the fingerprintsensor and passive infrared receiver in the form of a display on the Virtual Terminal. The minimalist structure ofthe system is composed of circuit diagrams, physical forms, and integrated wiring on the ATmega32 microcontrollersystem. The performance of the security system is shown, that the results of monitoring when the sensor is given input"human existence (motion)", the fingerprint sensor blinks (on) and when the fingerprint sensor blinks which meansready to receive input data in the form of "Human Initialization (fingerprint)" for activating actuators and startersystem on the car. Giving input commands to the sensor passive infrared receiver and fingerprint has functioned forthe appointment of performance, that the initial security system has been integrated with the main security systemand attached to the car
Implementasi Fuzzy Logic dan Trajectory Pada Manipulator Mobile Robot Untuk Deteksi Kebocoran Gas
Get PDFDeveloping technology can facilitate work activities, one of which is technology in the field of robotics. One of the purposes of creating the robot was to assist in investigating suspected targets. The target can be a gas source leak object. On the other hand, gas leaks in industrial estates have a large impact on the environment. Robots are needed to facilitate the inspection process of targets suspected of gas leakage. Robots generally have systems that are integrated with sensors as interfaces and intelligent computing. In this study mobile robots and manipulators have been designed and have the purpose of inspecting objects suspected of being gas leaks. This robot system is called a mobile robot manipulator equipped with a wireless camera for object detection, two gas sensors for aroma detection, each sensor is mounted on the end-effector manipulator and next to the camera. The methods used in robots are fuzzy logic and cubic trajectory. Fuzzy logic is used to navigate robots to objects, and cubic trajectory for navigating manipulators based on the specified route. In the experiments that have been done, the mobile robot can navigate to the target until it stops at a distance of 20cm, and the manipulator is also successful in navigating. In the testing instrument, two leaking points have been determined. Each point is tested six times. The robot succeeded in detecting gas leaks with a success rate of 91.67%, and the position of coordinates read by the manipulator can be observed through the monitor
Sistem Telemonitoring KWH Meter Menggunakan Modul Wi-Fi ESP8266 Berbasis Arduino Uno
Get PDFThe postpaid KWH Meter reading by officers is sometimes constrained to reach the physical KWH Meter because the house fence is locked or the KWH Meter is inside the house. This often causes problems suchas reading errors and the officer must come to the customer several times. Therefore a telemonitoring system for KWH Meters is made through an online WiFi network to help officers record electricity usage for consumers. This system uses ACS712 current sensor, ZMPT101B voltage sensor, different phase sensor, RTC DS1307 as a timer and date, Arduino as a data processor, Micro SD Card for storing date, time, and sensor readings, LCD as a viewer, and transmitted with modules ESP8266 Wi-Fi to a smartphone or PC with a simple web display. The test results show that all components can function properly. ACS712 30A current sensor has an average error of 1%, and the ZMPT101B voltage sensor is capable of carrying out voltage readings in load or no load conditions with an average error of0.5% and a different phase sensor has an average error of 1% for resistive load and 4.2% for inductive loads of TL lights. Power measurements have an average error of 1.3% for 75W incandescent lamp loads and 300W irons.The ESP8266 Wi-Fi module emits a maximum of 15 meters when not blocked and 10 meters when blocked. All measurement data can be stored on the SD Card
Metode Sederhana untuk Mengendalikan Inverter 5-Tingkat Berbasis Algoritma
Get PDFThe inverter with low voltage harmonics on the output side is a very interesting topic, and widely studied.One of these solutions is a 5-levels inverter: Dual Buck DC-DC Converter - H Bridge Inverter (DBC-HBI). Theinverter control methods based on digital sinusoidal pulse width modulation (DSPWM) are commonly implementedby one or a half of the wavelength algorithm (). However, one period could be constructed by combining fouralgorithms by . In this paper, an algorithm of DSPWM based on a algorithm is investigated. The aim of thisresearch is the simplest control and capacities of memory. Finally, a verification of the proposed method was carriedout by the experiment in the laboratory. Based on the laboratory tests: 1 algorithm has a simple algorithm, but useslarge memory, whereas a algorithm more complicated but uses less memory