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Mairizwan
Department of Physics, Universitas Negeri Padang, Padang, Indonesia

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Development of a Smart Home Control System Based on the Internet of Things Using an Android Application Ayu Ramadhana; Yulkifli; Mairizwan
Research on Instrumentation Vol. 2 No. 1 (2025): Research on Instrumentation
Publisher : RESSTECH

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.66926/rins.2025.20

Abstract

Housing is a fundamental human necessity that serves as a place for living, resting, and ensuring comfort and security. However, inefficient electricity consumption and inadequate security systems remain prevalent challenges in residential environments. This study aims to design and evaluate the performance of an Internet of Things-based smart home control system integrated with an Android application. The research adopts an engineering methodology consisting of system design, development, and experimental testing. The proposed system utilizes an ESP32 microcontroller, Passive Infrared sensor, Light Dependent Resistor sensor, and relay module, with an Android-based interface developed using MIT App Inventor and supported by Firebase for real-time data communication. The system has two modes: automated mode, which is powered by sensor inputs, and manual application mode, which is enabled by voice instructions. In automatic mode, lights are engaged when low ambient light and movements are detected, whereas in application mode, users can control illumination remotely via voice interaction. Experimental results show that the system achieves 100% accuracy and precision under the test conditions. These findings show that the suggested smart home system is extremely dependable and successful in optimising energy use and improving residential security.
Development of Microstrip Low-Pass Filter for Weather Radar Razu Alfurkan Hamdi; Pakhrur Razi; Mairizwan
Research on Instrumentation Vol. 1 No. 2 (2024): Research on Instrumentation
Publisher : RESSTECH

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.66926/rins.2024.45

Abstract

This study aims to design and fabricate a microstrip-based lowpass filter optimized for weather radar applications at a working frequency of 2 GHz. This lowpass filter is designed using an NPC H220A substrate, which has a dielectric constant of 2.2 and a thickness of 1.6 mm. The selection of this substrate is based on its ability to produce stable performance at high frequencies and has material characteristics that support component miniaturization. The methodology used includes initial design using electromagnetic simulation software to determine the optimal dimensional parameters of the microstrip filter. After that, the fabrication process is carried out based on the simulation results, followed by filter performance testing through S-parameter measurements. The test results show that the designed filter successfully reaches a cutoff frequency of around 2 GHz with low insertion loss, and provides a significant signal reduction at frequencies above the cutoff. This indicates that the filter made has good ability to filter unwanted high-frequency signals, according to the needs of weather radar applications. Overall, this study has succeeded in producing a microstrip lowpass filter that meets the expected technical specifications, so that it can be applied in weather radar systems to improve the accuracy and efficiency of weather signal detection
A Step Impedance Microstrip Filter for Microwave RFID Application Gina Haziza Ariani; Asrizal; Mairizwan
Research on Instrumentation Vol. 1 No. 2 (2024): Research on Instrumentation
Publisher : RESSTECH

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.66926/rins.2024.46

Abstract

RFID is an automatic identification technology that uses electromagnetic waves to transmit and receive information stored in tags or responders upon request from an RFID reader. To ensure that only signals with the working frequency of the RFID reader enter the reader, the signals are filtered first using a filter. A filter is a transition device designed to pass desired frequencies while eliminating or attenuating undesired frequencies. Therefore, a lowpass microstrip filter is designed for RFID microwave applications to limit the radio wave frequencies used in the RFID system. The designed lowpass microstrip filter has a cut-off frequency of 2.4 GHz, an insertion loss of -3 dB, a return loss of -10 dB, and an input impedance of 50 ohm. The lowpass filter is implemented on a microstrip substrate NPC-H220A. variations in the physical design of the microstrip filter can affect the signal performance in achieving the desired cut-off frequency, insertion loss, and return loss. Thus, lowpass microstrip filters with different dimensions are designed. The result of these dimensional changes will be analyzed to determine which design yields the best performance that meets the desired specifications. This research is based on S-Parameters measured using a Vector Network Analyzer (VNA). According to the S-Parameter, S11 represents the return loss, which indicates how well the filter avoids signal reflection back to the source. The smaller the S11 value, the better the filter performance in reducing reflections. S21 represents the insertion loss, measuring the signal loss as it passes through the filter. The smaller the S21 value, the more efficient the filter, indicating that a larger signal successfully passes through the filter
Co-Authors Asrizal Ayu Ramadhana Gina Haziza Ariani Pakhrur Razi Razu Alfurkan Hamdi Yulkifli