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INDONESIA
GEMA TEKNOLOGI
Published by Universitas Diponegoro
ISSN : 08520232     EISSN : 2656582X     DOI : -
Core Subject : Science,
Computer Science & IT
Gema Teknologi Journal (pISSN : 0852-0232, eISSN : 2656-582X) is an open access journal published by Vocational School, Diponegoro University, Indonesia. Gema Teknologi publishes articles from various engineering disciplines (the results of original scientific research or new scientific studies of literature). Editor receives articles both in English and Indonesian. Gema Teknologi Journal is published 2 (two) times a year, on April and October.
Arjuna Subject : -
Articles 217 Documents
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Analisis Panel Surya Dengan Variasi Jenis Material Sel Surya Ambar Yulianti; Fakhruddin Mangkusasmito
Gema Teknologi Vol 22, No 4 (2024): October 2023 - April 2024
Publisher : Vocational School Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/gt.v22i4.90301

Abstract

This study aims to analyze the performance of various types of solar panels based on solar cell materials and technologies in order to determine energy conversion efficiency and their suitability for specific applications. The three main materials examined are monocrystalline silicon, polycrystalline silicon, and thin-film, each with different characteristics in terms of light absorption, efficiency, and environmental durability. Emerging technologies such as Passivated Emitter and Rear Cell (PERC) and tandem cells are also analyzed to assess their potential performance improvements over conventional technologies. The research was conducted through experimental testing and simulations, measuring the power output and efficiency of each panel type under different environmental conditions, such as varying light intensities and operational temperatures. The results show that monocrystalline silicon panels with PERC technology deliver the highest energy conversion efficiency, while thin- film panels perform better in low-light conditions and offer greater flexibility. These findings provide a comprehensive understanding of the advantages and limitations of each solar panel material and technology, serving as a valuable reference for selecting the most suitable panel type for household, industrial, or large-scale renewable energy projects.
Alat Ukur Deviasi Error KWH Meter Digital 1 Fasa Dengan Metode Pengukuran Daya Untuk Mengetahui Penyimpangan Perhitungan Energi Lalu Thoriq Darlyn Pratama; Arkhan Subari
Gema Teknologi Vol 22, No 2 (2023): October 2022 - April 2023
Publisher : Vocational School Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/gt.v22i2.90199

Abstract

Metering Devices (APP) are a key component in the energy transaction sector at PT. PLN (Persero) because they affect the calculation of the company’s revenue. However, in the field, damage and tampering with APPs are frequently encountered, resulting in revenue losses for PLN. Damage to APPs generally occurs naturally due to the devices’ age. Meanwhile, tampering with APPs is usually caused by deliberate actions by customers who alter the wiring of the kWh meter to reduce the recorded energy consumption. Until now, PLN staff have struggled to verify the presence of damage or tampering in the AMUs due to time constraints and limited testing equipment, resulting in inspections being conducted only visually. This kWh meter error deviation measurement device will help PLN staff identify problematic AMUs more efficiently and easily. This device measures the power recorded by the APP via the LED impulse indicator parameter and compares it with the actual power consumed by the customer as measured by the PZEM 004T sensor module, thereby determining the percentage of the kWh meter’s error deviation. After obtaining the error deviation value, the device will send an SMS notification using an 800L SIM card to staff at the office; thus, if an error deviation value exceeding the tolerance limit is found, it will be used for enforcement purposes as well as customer analysis and evaluation (ANEV). The results from this device demonstrate good accuracy because, when testing different loads on the same APP, the deviation values do not fluctuate. in the tests conducted, the average deviation was 1.89% under normal conditions and -23.94% under conditions where a deviation was present. Furthermore, this device has an average error difference of only 0.59% when measurements are taken using the device compared to manual calculations of the error deviation. This device can help improve inspection efficiency.
Sistem Kontrol Dan Monitoring Suhu Serta Kelembapan Pada Inkubator Jamur Tiram Menggunakan ESP32 Dengan Metode PID Berbasis Blynk Agung Dwi Nugroho; Priyo Sasmoko Sasmoko
Gema Teknologi Vol 22, No 2 (2023): October 2022 - April 2023
Publisher : Vocational School Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/gt.v22i2.90289

Abstract

Oyster mushroom cultivation is highly influenced by environmental conditions, particularly temperature and humidity. The challenge is even greater in dry climate regions such as the Middle East, where high temperatures and low humidity prevail, thus requiring an automated system to maintain stable incubator conditions. This study designs and implements a temperature and humidity control system based on an ESP32 microcontroller with a DHT22 sensor as the main detector. Temperature control is carried out using a PID algorithm with exhaust fan and PTC heater actuators, while humidity control applies a two-position (hysteresis) logic with a pump and mist nozzle actuator. Temperature and humidity data are displayed in real time through the Blynk application, which also allows setpoint adjustments via smartphone. The test results show that the system can maintain incubator conditions according to the defined setpoints, with stable temperature response and effective humidity control without excessive pump switching. Therefore, this system improves the efficiency and reliability of oyster mushroom cultivation in dry climates with less favorable environmental conditions.
Rancang Bangun Sistem Distance Warning Pada Dump Truk Berbasis Arduino Uno Dengan Menggunakan Sensor Lidar Tito Bobot Pamungkas; Arkhan Subari
Gema Teknologi Vol 21, No 3 (2021): April 2021 - October 2021
Publisher : Vocational School Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/gt.v21i3.90269

Abstract

The distance warning system on a dump truck is a system designed to alert the driver when the distance between the dump truck and an object in front of it exceeds a predetermined threshold, using both visual and audible alerts. In this final project, the distance warning system was implemented on a dump truck using an Arduino Uno as the microcontroller and a LiDAR sensor as the input source to detect the distance between the dump truck and the object in front of it; the LiDAR sensor is also capable of providing consistent distance data. Testing was conducted to measure the accuracy and consistency of the distance warning system so that the test results could demonstrate that the distance warning system on the dump truck is capable of accurately alerting the driver, thereby enhancing safety and minimizing the risk of accidents involving dump trucks in the field. One of the tests conducted assessed the accuracy of the lidar sensor in detecting distance, with a maximum detectable range of 40 meters and a tolerance limit of ±2.5 cm for distances <5 meters and ±10 cm for distances >5 meters.
Rancang Bangun Sistem Monitoring Dan Deteksi Dini Gangguan Pada Panel Surya Berbasis Internet Of Things (IoT) Menggunakan Komunikasi Blynk Gilang Alviano; Jaka Windarta; Yuniarto Yuniarto
Gema Teknologi Vol 23, No 2 (2025): October 2024 - April 2025
Publisher : Vocational School Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/gt.v23i2.90340

Abstract

The use of solar power plants (SPP) requires a monitoring system capable of displaying operating parameters and identifying malfunctions early on. This study aims to design and build an Internet of Things (IoT)-based monitoring and early fault detection system for solar panels using the ESP32 and Blynk communication. The system uses an INA219 sensor to measure voltage, current, and power; a BH1750 sensor to measure light intensity; and a DS3231 RTC for time logging. Data is processed using the Rule-Based Fault Detection method to identify NORMAL, SHADOW, and CABLE FAULT conditions, displayed in real-time on Blynk, and saved to Google Spreadsheet at five-minute intervals. Testing included sensor validation, 24-hour monitoring, and fault simulations. Validation results showed an average error of 0.94% for the INA219 current, 0.50% for voltage, and 0.35% for the BH1750 light intensity, with accuracies of 99.06%, 99.50%, and 99.65%, respectively. During the monitoring test, the maximum power during charging reached 33.841 W, while the minimum power during discharging was recorded at 0 W. The system identified normal conditions at a voltage of 14.38 V, a current of 2.16 A, a power of 30.62 W, and a light intensity of 54,612 lux without issuing a notification. Under SHADOW conditions, a light intensity of 67.5 lux, a current of 0.0002 A, and a power of 0.002 W triggered a fault status and a notification. Under CABLE FAULT conditions, a light intensity of 1,496.67 lux with a current of 0 A and a power of 0 W was also detected and generated a notification. These results demonstrate that the system can monitor solar panel parameters and distinguish between three operating conditions based on the applied rules.
Rancang Bangun Automatic Transfer Switch (ATS) Berbasis Mikrokontroler ESP32 Dilengkapi Sistem Monitoring Parameter Tegangan Menggunakan Blynk Qomarul Nur Wahid; Priyo Sasmoko
Gema Teknologi Vol 22, No 1 (2022): April 2022 - Oktober 2022
Publisher : Vocational School Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/gt.v22i1.90241

Abstract

Qomarul Nur Wahid 1), Priyo Sasmoko 2), ABSTRACT ATS is an electronic circuit that is used to operate the transfer of voltage sources from PLN sources to generators and vice versa. With the current distribution of electricity in society, many people have generators as backup electrical energy if PLN goes out. In this ATS there is an ESP32 microcontroller which is used as a controller for the entire ATS circuit system. The SSR-25DA relay is a switch to move sources from PLN-Genset or from PLN-Genset. To control the SSR-25DA relay, the BD139 transistor is used. The 1N4004 diode is used as a safety device when the SSR-25DA relay is switched for source switching, the 100nF capacitor is a filter to stabilize the signal to the SSR-25DA relay when the source is switched. To monitor voltage parameters on the ATS, the PZEM-004T sensor module is used. The ATS design is also equipped with Undervoltage and Overvoltage which functions as a protection system to protect when disturbances occur with an Undervoltage tolerance of -10% and Overvoltage of +5% of the standard voltage of 220 Volts. The way the system works is by reading the voltage parameters by the PZEM-004T sensor module and then processing the data by the ESP32 Microcontroller by activating the buzzer which is used as a marker when the voltage is below the SPLN Undervoltage voltage tolerance limit of 198 Volts and above the SPLN Overvoltage voltage tolerance limit of 231 Volts.
Rancang Bangun Sistem Solar Tracker Dual Axis Dengan Mekanisme Pan-Tilt Untuk Meningkatkan Daya Keluaran Panel Surya Sutriyani Lapian; Saiful Manan
Gema Teknologi Vol 22, No 4 (2024): October 2023 - April 2024
Publisher : Vocational School Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/gt.v22i4.90306

Abstract

This final project aims to design a two-axis solar tracking system with a pan-tilt mechanism. The system uses six light sensors (LDRs) and two servo motors to automatically adjust the position of the solar panel so that it remains perpendicular to the incoming sunlight. Four LDR sensors are used to move the servos horizontally, while the other two LDR sensors control vertical movement. To enhance directional sensitivity, each LDR sensor is enclosed in an 8-cm-long tube. The system uses an Arduino UNO microcontroller and is equipped with an RTC for time-stamping and an SD card module for data storage. System testing was conducted to evaluate sensor performance, servo motor movement, and solar panel power output. The test results showed that the system works well, with the LDR sensors and servo motors interacting effectively to track the sun’s movement, as demonstrated by the servo motors’ dynamic response to changes in light intensity. In terms of power, the system proved capable of optimizing energy absorption. Under sunny conditions, the maximum power generated reached 5.83 W. Although this did not reach the panel’s peak power specification (10 Wp), this difference was due to weather factors and less-than-ideal outdoor testing conditions.
Rancang Bangun Sistem Monitoring Pada Perhitingan Sambaran Petir Dengan Konektivitas Pada Modul ESP32 Dan Modul LoRa Achmad Arie Leo Faldi; Dista Yoel Tadeus
Gema Teknologi Vol 22, No 3 (2023): April 2023 - October 2023
Publisher : Vocational School Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/gt.v22i3.90297

Abstract

Indonesia is a country with a high frequency of lightning strikes, making it necessary to have a monitoring system capable of effectively recording lightning activity. This study designs a lightning strike counting monitoring system based on the ESP32 microcontroller with LoRa connectivity support. The detection system uses a passive-component-based analog circuit that captures the electromagnetic signals from lightning strikes; these signals are then converted into digital signals by the ESP32 and transmitted via the LoRa E220-900T22D module to the receiver unit. The prototype consists of two parts: a transmitter and a receiver. The transmitter is equipped with a lightning detector circuit, an 18650 battery, a TP4056 module, and a solar panel for self-powered operation. The receiver uses an ESP32, a LoRa module, and an I2C LCD to display the number of strikes in real time. Test results show that the system can detect signal changes from the detector circuit and count the number of detected lightning strikes. The LoRa module is capable of transmitting data reliably without a Wi-Fi network over a certain distance. This system can serve as an economical, self-contained, IoT-based lightning strike monitoring solution suitable for remote areas. Further development can be pursued through the integration of cloud data storage and specialized lightning strike sensors to improve accuracy.
Rancang Bangun Mesin CNC Router Untuk Pencetakan Jalur PCB Berbasis Arduino Uno Muhammad Iqbal Irsyad; Yuniarto Yuniarto
Gema Teknologi Vol 21, No 4 (2022): October 2021 - April 2022
Publisher : Vocational School Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/gt.v21i4.90285

Abstract

This study discusses the design and construction of a CNC router for PCB trace routing based on the Arduino UNO, using a NEMA 17 stepper motor and a 775 DC spindle. The machine was designed for a working area of 200 × 100 mm and tested on three types of PCB designs: PTH, SMD, and hybrid. Test results show the accuracy of axis movement after calibration, with average errors of 0.25% (X), -0.309% (Y), and 0.45% (Z). Testing of the PCB traces revealed that small traces (0.4–0.5 mm) exhibited significant deviations of up to 253%, while traces ≥1 mm in width were relatively accurate with errors <5%. The length and width dimensions of the PCB had very small errors (<0.6%), and all traces were successfully connected. Factors contributing to the deviations included the limitations of the timing belt-based mechanical system, the FlatCAM cutting parameters, and the machine’s body material. The results of this study indicate that an Arduino UNO-based CNC machine can be used for the production of simple PCBs with guaranteed connectivity, although improvements in accuracy are still needed for small-sized traces.
Rancang Bangun Alat Pendeteksi Pelanggaran Pemakaian Tenaga Listrik Pascabayar Berbasis Arduino Uno & SMS Gateway Diah Ayuningtyas; Dista Yoel Tadeus
Gema Teknologi Vol 22, No 2 (2023): October 2022 - April 2023
Publisher : Vocational School Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/gt.v22i2.90246

Abstract

PT. State Electricity Company (Persero) or abbreviated as PT. PLN (Persero) is a State-Owned Enterprise that provides electrical energy supply throughout Indonesia. Provision of electrical energy from PT. PLN (Persero) originates from power plants and then distributes it to customers through the transmission network and distribution network. However, electrical energy cannot be fully channeled. This is because in its distribution through the transmission network and distribution network experiencing depreciation of electric power or losses. Losses are a form of loss of electrical energy originating from the difference between the amount of available electrical energy and the amount of electrical energy sold. Losses are divided into 2 types, namely technical losses and non-technical losses. Losses of electric power can be caused by violations of the use of electricity from PLN customers, one of which is from household customers. Violations of the use of electricity are divided into 4 groups, namely P1, P2, P3, and P4. Therefore, a detector for the use of electric power is made. The system created uses the SIM 800 module which is set as a means of sending SMS when overcurrent is detected, where the microcontroller gets information from the PZEM sensor. When the load current is not the same as the mcb current, the SIM module will send an SMS to the smartphone.

Page 20 of 22 | Total Record : 217

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