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Program Studi Teknik Telekomunikasi Jurusan Teknik Elektro Politeknik Negeri Semarang Jl. Prof. H. Soedarto, S.H. Semarang
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Journal of Applied Information, Communication and Technology (JAICT)
Published by Politeknik Negeri Semarang
ISSN : 25416340     EISSN : 25416359     DOI : https://doi.org/10.32497/jaict
Core Subject : Engineering,
Engineering
Focus of JAICT: Journal of Applied Information and Communication Technologies is published twice per year and is committed to publishing high-quality articles that advance the practical applications of communication and information technologies. JAICT scope covers all aspects of theory, application and design of communication and information technologies, including (but not limited): Communication and Information Theory. Mobile and Wireless Communication, Cognitive Radio Networks. Ad Hoc, Mesh, Wireless Sensor Network, Distributed System and cloud computing Computer networking and IoT Optimization Algorithms, Artificial intelligence, Machine Learning, and Adaptive System.
Arjuna Subject : Teknik (semua kategori) - Teknik Listrik dan Elektro
Articles 100 Documents
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DESIGN AND IMPLEMENTATION OF AN X DOUBLE BAZOOKA ANTENNA IN A HYBRID COMMUNICATION SYSTEM Agik Septhiani; Hesty Fitriana; Budi Basuki Subagio; Tahan Prahara; Eko Supriyanto; Eni Dwi Wardihani; Agus Rochadi; Muhlasah Novitasari Mara
JAICT Vol. 11 No. 02 (2025): JAICT
Publisher : Politeknik Negeri Semarang

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Abstract

The double bazooka antenna is an antenna developed for military applications and later adapted by amateur radio enthusiasts for high-frequency (HF) communication. The double bazooka antenna consists of two elements: the main element, which functions as the transmitter element that transmits and receives radio frequency (RF) signals, and the auxiliary element, which serves to widen the bandwidth. The main element is the most significant factor influencing the antenna’s parameter characteristics. This study aims to realize a double bazooka antenna with a semi-directional radiation pattern at an operating frequency of 433 MHz, which will be applied as an external antenna in a hybrid communication system. The antenna material used in this study is RG-8 cable with a relative permittivity (εᵣ) of 2.3. Antenna parameter testing was conducted at the Telecommunication Engineering Laboratory of the State Polytechnic of Semarang using a Spectrum Analyzer, Vector Network Analyzer, Radio Frequency Generator, and Antenna Trainer Kit. The results of the double bazooka antenna parameter testing showed a return loss value of -23,345537 5 and a VSWR of 1:1.24 at a frequency of 433 MHz, which is in accordance with standards, and has a gain of 19.55 dBi with a semi-directional radiation pattern and vertical elliptical polarization. The double bazooka antenna was successfully implemented in a hybrid communication system, with test results showing that the antenna operates optimally. Keywords: double bazooka antenna, radio communication, hybrid communication system, handy talkie
Electrical Power Prediction of Polycrystalline Solar Panels based on LSTM Model with environmental influence Sahrin, Alfin; Utami, Erna; Shoffiana, Nur; Abadi, Imam
JAICT Vol. 11 No. 02 (2025): JAICT
Publisher : Politeknik Negeri Semarang

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Abstract

Solar energy is one of the most promising renewable energy sources that can support the sustainable energy transition. However, the electrical power produced by photovoltaic (PV) panels is greatly influenced by environmental conditions such as irradiation, temperature, humidity, and wind speed, making them volatile and difficult to predict. This study aims to develop a prediction model based on Long Short-Term Memory (LSTM) to estimate the power output of polycrystalline panels. Environmental data is collected in real-time, processed through the normalization stage, and then used as input in several model variants, namely pure LSTM, CNN-LSTM, LSTM-Autoencoder, and GWO-LSTM with metaheuristic optimization. Evaluation was conducted using R², RMSE, and MAPE metrics. The results showed that the pure LSTM model provided good accuracy (R² = 0.95; MAPE = 6.2%), while CNN-LSTM and LSTM-AE improved performance with R² reaching 0.97 and 0.96, respectively. The best model is GWO-LSTM, with R² = 0.98, RMSE = 0.31 kW, and MAPE = 4.3%. These findings prove that metaheuristic optimization in LSTM can increase the reliability of PV power prediction and support a more efficient energy management system.
Design of an Electrical Power Monitoring and Alert System Based on Internet of Things (IoT) for Chicken Coops Supriyanto, Eko; Hasan, Abu; Pramuji, Tulus; Nurrani, Hanny
JAICT Vol. 11 No. 02 (2025): JAICT
Publisher : Politeknik Negeri Semarang

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Abstract

- The reliability of the electricity supply is a vital factor in ensuring the sustainability of modern poultry farming systems.Power outages or electrical disturbances can disrupt ventilation, heating, and lighting systems, resulting in decreased productivityon poultry farms. This study aims to design an Internet of Things (IoT)-based power supply detection and early warning system tomonitor electrical conditions in real-time and provide automatic notifications to farmers. The system was developed using aZMPT101B voltage sensor, an ACS712 current sensor, and a NodeMCU ESP8266 microcontroller, all of which are connected tothe Blynk platform for notification delivery. The research employed a prototyping approach, consisting of five stages: communication, planning, design, construction, and implementation. Testing was conducted in a closed poultry house located inWonolopo, Mijen, Semarang City. The results showed that the system was able to detect power disturbances with an accuracy rateof 97.6% and a notification response time of less than 3 seconds. The system proved effective in providing early warnings to farmers and enhancing the operational safety of electricity-based poultry farms.
Optimisation of Energy Consumption Balance in Multi-Hop Topology Wireless Sensor Networks for Environmental Monitoring Systems along Railway Tracks Suharjono, Amin; Sadewa, Eskandaru Erin
JAICT Vol. 11 No. 02 (2025): JAICT
Publisher : Politeknik Negeri Semarang

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Abstract

The implementation of IoT requires careful planning so that the system can function optimally. This study describes the planning of WSN development as a network in an IoT system with a long, straight topology, such as that found on railway tracks. The planning includes the use of appropriate technology with minimal power consumption. Three simulation scenarios were conducted using LPSAN, LPWAN, and a combination of both to compare their performance on a straight-line topology. The profile of each technology in LPSAN and LPWAN in terms of their performance in transmitting sensor data in the IoT system will be determined. The network lifetime performance is also determined to demonstrate the energy efficiency of each technology. Thus, the most optimal scenario in terms of configuration and topology in a straight-line network will be selected. From the experiments conducted, it is concluded that multihop topology is generally recommended for use in straight-line networks compared to star topology, except in conditions where nodes are very close to the gateway
An IoT-Based Monitoring and Control System for Chrysanthemum Cultivation Wardani, Elva Puspita; Al Khusain, Muhammad Ajik; Kusumastuti, Sri; Sihono
JAICT Vol. 11 No. 02 (2025): JAICT
Publisher : Politeknik Negeri Semarang

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Abstract

Chrysanthemum cultivation in greenhouse environments requires stable control of environmental conditions, particularly air temperature, light intensity, and soil moisture, to ensure optimal plant growth. However, conventional manual monitoring and control methods still face limitations in terms of efficiency and accuracy. This study aims to design and implement an Internet of Things (IoT)-based monitoring and control system for chrysanthemum cultivation using the NodeMCU ESP8266 microcontroller. The system is equipped with a DHT22 sensor for air temperature, a BH1750 sensor for light intensity, and a capacitive soil moisture sensor v2. Measurement data are transmitted in real time to a Firebase Realtime Database and displayed through the ChrysoSmart mobile application, which supports both automatic and manual operating modes. System testing was conducted directly in a chrysanthemum greenhouse to evaluate sensor performance, actuator operation, and data communication stability. The test results indicate that the system is capable of real-time monitoring and control of greenhouse environmental conditions, with average sensor errors of 0.99% for temperature, 1.11% for light intensity, and 2.96% for soil moisture. The actuators, including a water pump, lighting system, and exhaust fan, operated properly according to system logic and user commands. Therefore, the ChrysoSmart system is considered feasible and effective for supporting automated and remote environmental management in chrysanthemum greenhouse cultivation.
Performance Comparison between Gain Scheduling PID and Fuzzy Mamdani Controllers for an Air Heating Module Hendradi, Rizky Maulana; Nursaputro, Septiantar Tebe; Hakim, Arief Rahman; Sulistiyo, Wahyu
JAICT Vol. 12 No. 1 (2026): JAICT
Publisher : Politeknik Negeri Semarang

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Abstract

This study compares the performance of Gain Scheduling Proportional–Integral–Derivative (GS-PID) control and Fuzzy Mamdani control applied to an air heating module. The system was implemented using an STM32 microcontroller and evaluated experimentally under temperature setpoints of 50 °C, 60 °C, 70 °C, and 80 °C. Performance was assessed based on dynamic response parameters, including rise time, overshoot, steady-state error (SSE), Integral of Absolute Error (IAE), Integral of Squared Error (ISE), and Integral of Time-weighted Absolute Error (ITAE). The experimental results show distinct characteristics between the Gain Scheduling PID (GS-PID) and Fuzzy Mamdani controllers under varying setpoints. The GS-PID controller exhibits a rise time of approximately 4.0–4.9 s with relatively small overshoot in the range of 1.18–2.87%, while maintaining a very low steady-state error of about 0.001–0.24%. In contrast, the Fuzzy Mamdani controller achieves a faster rise time of around 2.0–2.6 s at low to medium setpoints, which increases to approximately 5 s at higher temperatures. The overshoot produced by the Fuzzy Mamdani method ranges from 0–4.78%, decreasing as the setpoint increases, with zero overshoot observed at high setpoints due to incomplete setpoint tracking. Moreover, the Fuzzy Mamdani controller yields higher performance index values (IAE, ISE, and ITAE), indicating larger accumulated error over time. Overall, GS-PID control is more effective in ensuring steady-state accuracy and stability, whereas Fuzzy Mamdani control provides a faster transient response at lower operating temperatures.
Design and Development of Gain Scheduling PID and Fuzzy-PID Control for DC Motor Speed Based on MATLAB Simulink Supriyo, Bambang; Aprilian Nisha, Marshanda; Djenar Dinda Lestari, Keisya; Setya Kartika, Vinda
JAICT Vol. 12 No. 1 (2026): JAICT
Publisher : Politeknik Negeri Semarang

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Abstract

Speed control of DC motors plays an important role in industrial applications because it directly affects system performance and efficiency. Conventional PID controllers are widely used; however, they have limitations in handling setpoint changes and varying system dynamics. Previous studies have shown that adaptive methods such as Gain Scheduling PID and Fuzzy-PID can improve control performance, but comparative studies under varying setpoints remain limited. Therefore, this research aims to design and analyze the performance of Gain Scheduling PID and Mamdani-based Fuzzy-PID controllers for DC motor speed control using MATLAB Simulink. The research method includes DC motor modeling, controller design, simulation under setpoint variations from 2000 to 8000 RPM, and performance analysis based on rise time, overshoot, settling time, and steady-state error. The results indicate that both controllers are capable of regulating DC motor speed effectively; however, the Fuzzy-PID controller provides a more adaptive transient response with lower overshoot and steady-state error at certain operating conditions compared to the Gain Scheduling PID controller.
A Smart Home Electricity Meter Based on IoT with Bill Prediction Using Random Forest Algorithm Muhtaredi, muhtaredi
JAICT Vol. 12 No. 1 (2026): JAICT
Publisher : Politeknik Negeri Semarang

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Abstract

Electricity consumption in households continues to increase along with the growth of electrical appliances used in daily activities. However, most users do not have real-time information about their electricity usage, which often results in inefficient energy consumption and unexpected electricity bills. This study aims to design and implement a smart electricity metering system based on the Internet of Things (IoT) with a billing prediction feature using the Random Forest algorithm. The proposed system measures electrical parameters such as voltage, current, and power consumption using sensors connected to a microcontroller. The collected data are transmitted to an IoT platform to provide real-time monitoring of electricity usage through a mobile application. Furthermore, the Random Forest algorithm analyzes the collected data to predict future electricity bills. The results show that the developed system can monitor electricity consumption in real time and provide accurate billing predictions. The prediction model achieved a Root Mean Squared Error (RMSE) of 0.31% with an accuracy level of 99.69%. The system also provides electricity consumption information for three selected rooms in the household.
Design Build Temperature and Humidity Monitoring Internet of Things based for Optimization Oyster Mushroom Growth Waluyo, Catur Budi; Alsah Nur Laila; Sasya Puteri Setyahadi; Sarono Widodo; Abu Hasan; Thomas Agung Setiawan; Budi Basuki Subagio; Muhlasah Novitasari Mara
JAICT Vol. 12 No. 1 (2026): JAICT
Publisher : Politeknik Negeri Semarang

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Abstract

Oyster mushroom (Pleurotus ostreatus) cultivation in Indonesia faces challenges in maintaining stable temperature and humidity in the growing room, particularly because monitoring is still performed manually, which increases the risk of errors. To address this issue, Sasya Puteri Setyahadi and Alsah Nur Laila designed an Internet of Things (IoT)-based temperature and humidity monitoring system that can be accessed in real time and remotely. The system uses the SHT31 sensor for data acquisition, an ESP32 microcontroller as the main processor, and the Firebase platform for data storage and visualization. Data are displayed through a web application and are integrated with an automatic watering response when parameter values fall outside the optimal range of 16–30 °C for temperature and 80–95% for humidity. Testing results showed that the system is capable of reading and transmitting data accurately and quickly. The main contribution of this study is the development of an environmental monitoring system for oyster mushroom cultivation with an automatic notification feature based on threshold values, which can serve as a foundation for future automated control systems. Comparative testing showed that the SHT31 sensor had an average temperature measurement error of 1.427% (accuracy 98.573%) and an average humidity measurement error of 2.017% (accuracy 97.983%) compared to the HTC-1 reference instrument. Meanwhile, the JSN-SR04T water level sensor achieved an average error of 2.076% (accuracy 97.924%). Furthermore, the system demonstrated an average data transmission delay of 1488.89 ms and an average jitter of 11.588 ms. Overall, the high accuracy across tests, combined with relatively low delay and jitter values, indicates that the system performs effectively and reliably in maintaining the mushroom house environment within the ideal range required to support optimal oyster mushroom growth.
Implementation and Analysis of Quadrature Amplitude Shift Keying Modulation Using SDR Devices for Wireless Communication Systems Rochmatika, Rizkha; Jeffri Pratama; Slamet Mulyadi; Abu Hasan; Irfan Mujahidin; Muhlasah Novitasari Mara; Filda Hulwani Dewi
JAICT Vol. 12 No. 1 (2026): JAICT
Publisher : Politeknik Negeri Semarang

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Abstract

This research aims to implement and analyze the performance of Quadrature Amplitude Shift Keying (QASK) modulation in wireless communication systems using Software Defined Radio (SDR) devices. This research uses ADALM-PLUTO as the transmitter and RTL-SDR as the receiver, with signal processing performed through GNU Radio software. The main focus of this research is to evaluate the implementation of 4-QASK modulation in wireless data transmission at several different frequencies (300 MHz, 500 MHz, 1 GHz, and 1.5 GHz) and different distances (1 meter to 5 meters), as well as to measure transmission quality using the Packet loss and Received Signal Strength Indicator (RSSI) parameters. The test results show that this system is capable of transmitting data with good quality, with RSSI values ranging from 51.41 dBm to -62.59 dBm, indicating good to very good signal quality. This test also showed that the further the distance between the transmitter and receiver, the lower the signal reception quality, especially at higher frequencies, indicating a significant influence of distance and frequency on the received signal strength. Based on the results obtained, it can be concluded that QASK modulation using SDR, particularly 4-QASK, is effective in wireless communication with good performance at short to medium distances.

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