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SPEKTRAL : Journal of Communications, Antennas and Propagation
Published by Politeknik Negeri Jakarta
ISSN : -     EISSN : 27745562     DOI : https://doi.org/10.32722/spektral.v1i1
Core Subject : Science, Engineering,
Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Engineering
Komunikasi dan Teknologi Jaringan : Sistem Komunikasi Nirkabel dan Bergerak, Pengolahan Sinyal Digital dan Multimedia, Pengolahan Sinyal Biomedik, Teori Informasi , Modulasi, Pengkodean Sumber dan Kanal, Algoritma dan Protokol Komunikasi, Komunikasi Radio dan Satelit, Penerapan IoT, Jaringan Telekomunikasi, Komunikasi Optik, Jaringan Sensor Nirkabel, Artificial Intelligence, Machine Learning, Computer Vision, Mobile and Cloud Computing, Pervasive Computing, Big Data, Keamanan Jaringan, Cognitive Radio, Embedded System. Antena dan Propagasi: Desain dan Analisa Antena, Microstrip Antena, Penerapan Teori Medan Elektromagnetik, Radar and Remote Sensing, Gelombang mikro dan gelombang millimeter, Pemodelan Kanal dan Propagasi.
Arjuna Subject : Teknik (semua kategori) - Teknik Listrik dan Elektro
Articles 51 Documents
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Rancang Bangun Smart Controller untuk Tanaman Anggur di Greenhouse Menggunakan Modul Long Range (LoRa) Mohammad Alif Budiman; Vania Reviana; Viving Frendiana
Spektral Vol. 3 No. 2 (2022): Oktober 2022
Publisher : Politeknik Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32722/spektral.v3i2.5085

Abstract

Grapes are one of the plants cultivated by the Duren Tiga greenhouse. Growing grapes requires soil that is not too wet, a temperature that is not too hot, and soil pH that is suitable are needed, so a smart greenhouse is needed to help monitor and irrigate the grapes. In this paper, a design of a smart controller using a Long Range (LoRa) module for a smart greenhouse system is presented. The system uses a DHT11 temperature sensor, a soil moisture sensor as a soil humidity sensor, a soil pH sensor, and a BH1750 light intensity sensor. A LoRa module with a frequency of 922 MHz and an ESP32 NodeMCU as a microcontroller on the transmitter and receiver side are needed for data transmission. Testing results of the temperature sensor in both nodes showed very good accuracy with error values of 1.40 and 1.49. Testing results of the soil humidity sensor in both nodes also showed very good accuracy with error values of 1.97 and 2.36. Similarly, testing of the soil pH sensor in both nodes resulted in good accuracy with error values of 1.34 and 1.72. Testing of the BH1750 light intensity sensor also showed good accuracy with error values of 4.13 and 5.08. Testing of the LoRa module showed a range of 1.4 km with an RSSI of -109 dBm and an SNR of -9.5 dB, and data that can be received up to 10 packets with a throughput of 42.67 bps, which is considered sufficient.
Perancangan Aplikasi Android Untuk Memonitoring Salinitas dan Suhu Air Aquarium pada Budidaya Ikan Badut Malika Sahnah; Yenniwarti Rafsyam
Spektral Vol. 3 No. 2 (2022): Oktober 2022
Publisher : Politeknik Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32722/spektral.v3i2.5098

Abstract

Clown fish is a fish that is widely cultivated by farmers in aquariums. In its cultivation, there are several parameters that need to be considered, namely air salinity levels ranging from 29 PPT - 37 PPT and air temperatures ranging from 25°C-30°C. To make it easier to monitor salinity and temperature in the aquarium, the NEMOKU application was created for a monitoring system and remote control of salinity and air temperature through the Android application, which has a control system in the form of an aquarium heater, as well as fresh and salt water pumps. The NEMOKU application has an automatic and manual monitoring system. In the manual system, the fish farmer activates the system through the application, according to the conditions of the aquarium. If the salinity is <29 PPT, the farmer activates the salt water pump, if the salinity value is >37 PPT, activates the fresh water pump and if the temperature is <25°C, activates the aquarium heater. In an automatic system, the system will automatically activate to maintain the salinity and temperature in the aquarium. From the tests carried out, the system that has been designed works well in sending salinity and temperature data as well as remote control. The specifications of the tool used for applications made using Android Studio Version Bumblebee software, laptops with Intel® Core TM i3 2370 M CPU @ 2.8 GHz, 4 GB Memory, 500 GB Harddisk and 14 inches Monitor.
Pengembangan Sexual Assault Panic Button dengan Fitur Perekam Suara dan Gambar serta Notifikasi Pesan dan Koordinat GPS Nabila Azalia Rahma; Agus Wagyana
Spektral Vol. 3 No. 2 (2022): Oktober 2022
Publisher : Politeknik Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32722/spektral.v3i2.5103

Abstract

Efforts to prevent cases of sexual violence can be carried out in various ways, one of which is by making a panic button that can be used when in an emergency situation. This panic button is equipped with several features, namely image capture, voice recording, message notifications, and sending GPS location coordinates. The main component used is a push button which is connected to the ESP32 and ESP-32Cam microcontrollers. Other modules used are the Neo - 6M GPS module as a location tracker, the ISD1820 module as a voice recorder, and a buzzer as an alarm generator. The ESP-32Cam module functions to take pictures automatically. When the victim of sexual violence presses the push button on the device, the buzzer will sound as an alarm and the ISD1820 module will start recording sound. Then, ESP32 will send a message via the Telegram application in the form of a warning sign and a Google Maps link obtained from the GPS module. In addition, the push button is also connected to the ESP-32Cam which automatically takes pictures and sends them to the Telegram application. There are 2 tests performed on this panic button. The first is the GPS feature test which was carried out in 2 different conditions with an average distance difference of 3.7765 m at an open location and 13.085 m at a closed location. The second is the calculation of the delay in the process of sending data from the panic button to the telegram application with a delay value of 04.29 seconds in remote testing and a delay of 04.2133 seconds at close range and the average delay value is 04.25 seconds.
Optimasi Neighbor List Sel 4G ke 3G dengan Automatic Neighbor Relation (ANR) di Kota Tangerang Selatan Mohamad Fathurahman; Zulhelman *; Muhammad Arif Rahman; Endang Saepudin
Spektral Vol. 3 No. 2 (2022): Oktober 2022
Publisher : Politeknik Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32722/spektral.v3i2.5101

Abstract

SON technology is used to change the network optimization process that was previously done manually to be automated. One of the main modules of SON is Automatic Neighbor Relation (ANR). ANR works by optimizing the Neighbor List to increase the number of successful submissions and reduce failed connections. In this report, the implementation of SON in the city of South Tangerang will be carried out using the ANR module. Optimization is carried out on 4G to 3G neighbor cells to increase the success rate of Circuit Switched Fall Back (CSFB). From the results of this optimization, it is known that the existing frequencies and bands in South Tangerang City are 251 (10 MHz), 1850 (10, 20 MHz), 3500 (10 MHz), 38750 (20 MHz), and 38948 (10, 20MHz) for the 4G networks and 10638 for 3G networks. The results of the implementation of the 4G3G IRAT ANR module in South Tangerang City showed a good decision by adding good relations and eliminating bad relationships so that there was a change in KPI on the CSFB side with an increase of 0.68% for the success of CSFB preparation and 3.25% for the success rate of execution CSFB.
Rancang Bangun Alat Pendeteksi Uap Vaping dan Asap Rokok Berbasis Internet of Things Terintegerasi Aplikasi Android Rifqi Fuadi Hasani; Benny Nixon; Alifa Humairah; Augita Yasmin
Spektral Vol. 4 No. 1 (2023): April 2023
Publisher : Politeknik Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32722/spektral.v4i1.5629

Abstract

Smoking is one of causes disease which especially on respiratory tract because the cigarette were content that is not good for body. Passive smoker is really made a loss for smoke/vapor that they inhaled. So therefore, smoke detector was created by using connection of WiFi that connected to ESP32 which sending data of detection  from MQ-2 sensor (detect content’s smoke of tobacco cigarette) and Adafruit sensor (detect content’s vapor of e-cigarette) to firebase that integrated by android software. This would faciliated for hotel firm because the hardware not only detect smoke of cigarette, but also vapor of vape will detected so guest that disobey the rules who using except cigarette will be fined which will be monitored by hotel’s employee remotely via android software. System of this hardware specifically only for once detected which if it detected, then green LED changed to yellow (e-cigarette) if the amount shows ≥ 25 ppm and/or red (tobacco cigarette) ) if the amount shows ≥ 0.05 ppm which followed by sound of buzzer and DC fan that will dispensed smoke/vapor out of room. Neutral room which was tested for 10 minutes produced a maximum of 0.03 ppm amount of detected smoke and 24 ppm amount of detected vapor. In the MQ-2 sensor experiment with a level of 1 burst it produces 0.42 ppm and delay of 2 seconds for the sensor to detect, in a room with a volume of 1050 m3 it returns clean with a delay of 11 seconds with amount of 0.04 ppm. In the Adafruit sensor experiment with a concentration of 1 burst it produces 33 ppm, a delay of 2 seconds for the sensor to detect, in a room with a volume of 1050 m3 it returns clean with a delay of 8 seconds with amount of 24 ppm.
A Methodology to Plan Wireless Network in Indonesian Rural Areas Nazmia Kurniawati
Spektral Vol. 4 No. 1 (2023): April 2023
Publisher : Politeknik Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32722/spektral.v4i1.5558

Abstract

Wireless telecommunication networks have been widely implemented in Indonesia. However, the planning methodology hasn’t been intensively studied. In this paper, we proposed a novel methodology for wireless local area network planning in Indonesian rural area. Our proposed method consists of eleven steps of work emphasizes the ease of implementation, market survey consideration, Indonesian Government standard application, and free tools usage optimization. At the end, an example of a network design created by following the proposed methodology for Sebira Island is presented.
Rancang Bangun Sistem Miniatur Smart Garden dengan Aplikasi Android Berbasis Internet of Things (IoT) Alvionita Pingkan; Indira Marasti; Benny Nixon
Spektral Vol. 4 No. 1 (2023): April 2023
Publisher : Politeknik Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32722/spektral.v4i1.5645

Abstract

Gardening is an activity widely practiced for the preservation of plants or simply as a hobby. However, gardening is still quite challenging for many people due to limited available land. Apart from land constraints, another inhibiting factor is the reliance on manual tasks, such as the watering process. Therefore, one solution that can be implemented is to create a miniature garden with a system that can control and monitor Soil Moisture, temperature, air humidity, and light intensity. The smart garden miniature system utilizes Arduino IDE software, an ESP32 module as the microcontroller, Soil Moisture sensors, DHT-22 sensors, an L298N motor driver to operate the water pump and exhaust fan, and relays connected to LED strips. This system is connected to an Internet of Things-based Android application. The results show that the control and monitoring system operates effectively, in line with the predetermined design.
Perancangan Antena Vivaldi Antipodal 2 - 18 GHz untuk Radio Direction Finder Deri Latika Herda; Siska Aulia; Frenzi Agres Yudithia
Spektral Vol. 4 No. 1 (2023): April 2023
Publisher : Politeknik Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32722/spektral.v4i1.5654

Abstract

The 2-18 GHz frequency band is a spectrum that is widely used for telecommunication systems, both military and civil. This is proportional to the number of illegal uses. This research develops an antipodal vivaldi antenna to support direction finding activities of illegal transmitters in the 2-18 GHz frequency band. Antenna design is a simulation using CST software by modifying the ground, widening the antenna arm, and increasing the length of the transmission line. The antenna design measures 94.14 x 73.2 mm on FR-4 substrate with a dielectric constant of 4.6 and a thickness of 1.6 mm. The simulation results show that the antipodal vivaldi antenna has a value -49.95378 dB ≤ S11 ≤ -10.022357 dB, 1.0066947≤ VSWR ≤1.9248251 and an average gain of 5.1558 dB in the 2-18 GHz frequency band.
Pengukur Gula Darah Non-Invasif Berbasis Internet of Things Nila Novita Sari; Angely Fransiska Kurnia Lazha
Spektral Vol. 4 No. 1 (2023): April 2023
Publisher : Politeknik Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32722/spektral.v4i1.5864

Abstract

Diabetes is a chronic disease characterized by high blood sugar levels. Without proper attention and treatment, diabetes can become a deadly disease. It is estimated by the International Diabetes Federation, that by 2045 there will be 28.6 million diabetics in Indonesia. Monitoring blood sugar levels regularly every day can help diabetics continue to monitor blood sugar levels so that they remain within normal limits. Generally checking blood sugar must be passed with an uncomfortable and even painful feeling because a blood sample is needed. The process of taking blood samples is known as an invasive method, namely by pricking a fingertip with a lancet so that blood comes out, then a drop of blood is placed on a test strip and the results will come out on the glucose meter. To facilitate monitoring of blood sugar levels, this research has developed a non-invasive tool that can help diabetics control their blood sugar levels. By utilizing the Near-Infrared Spectroscopy method, the examination will be carried out more comfortably, painlessly, and affordably. This tool, which was built using the Flame Detection Module and ESP32, has been functioning with an error percentage in the tests conducted on 5 volunteers of 17.9%. The output resulting from measuring blood sugar levels will be sent to Telegram application along with the measurement date so that the data can be used as a daily monitoring record.
UV LEVEL MONITORING IN ANDROID-BASED SKIN HEALTH SYSTEMS Herlina L, Yeli; Rafsyam, Yenniwarti
Spektral Vol. 5 No. 1 (2024): April 2024
Publisher : Politeknik Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32722/spektral.v5i1.6707

Abstract

This research proposes a system to monitor the level of UV exposure to android-based skin, using the VEML6075 sensor and ESP32 module. Excessive UV exposure can have a negative impact on skin health such as premature aging and the risk of skin cancer. In this research, ESP32 module is designed and integrated with VEML6075 sensor to measure UV level accurately and send UV level data to android application through internet connection. The android application created allows users to monitor UV exposure levels in various environmental conditions. In addition, the application provides suggestions and alerts based on UV levels, helping users to take appropriate actions in caring for skin health. Tests were conducted on 3 environmental conditions namely indoors, indoors exposed to sunlight and outdoors exposed to direct sunlight. Also testing was carried out at 09.00 WIB to 15.00 WIB with a distance of 30 minutes. The results of the test obtained UV levels from 0.00125 to 5.02324.

Page 3 of 6 | Total Record : 51

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