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Journal : SPEKTRAL : Journal of Communications, Antennas and Propagation

Rancang Bangun Sistem Pemantau dan Pengendali Nutrisi Tanaman Hidroponik Berbasis Modul Long Range (LoRa) Shafira Rana Rafidah; Agus Wagyana
Spektral Vol. 1 No. 1 (2020): Oktober 2020
Publisher : Politeknik Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32722/spektral.v1i1.3434

Abstract

Hidroponik merupakan metode pembudidayaan tanaman tertentu menggunakan air sebagai media tanamnya. Pemenuhan dan pemeliharaan tanaman hidroponik relatif tidaklah sulit, namun membutuhkan perhatian yang lebih, seperti pemantauan kondisi larutan yang harus dilakukan secara rutin. Sampai saat ini, pemantauan parameter larutan nutrisi tanaman hidroponik masih banyak dilakukan secara manual. Penelitian ini bertujuan untuk mendapatkan sistem monitoring suhu dan kepekatan larutan di media tanam serta sistem pengendali otomatis penambahan larutan nutrisi tanaman hidroponik. Sistem menggunakan sensor suhu DS18b20 dan sensor kepekatan larutan SEN0244. Sedangkan komunikasi jarak jauh antara user dan unit hidroponik menggunakan modul LoRa RFM95W dengan frekuensi 915 MHz. Secara otomatis sistem akan memberikan larutan nutrisi apabila kadar kepekatan larutan sudah mengalami penurunan di bawah 1000 ppm. Hasil pengujian pengiriman data pada kondisi LOS mendapatkan jarak jangkauan terjauh adalah 700 m dengan RSSI -103 dBm sedangkan pada kondisi NLOS didapatkan jarak terjauh hanya 200 m dengan RSSI -101 dBm. Selain itu hasil pengujian kondisi kepekatan air selama dua minggu menunjukan bahwa saat sensor kepekatan nutrisi mendeteksi nilai di bawah 1000 ppm maka pompa bekerja memberikan larutan tambahan.
Rancang Bangun Antena Mikrostrip Triangular Patch Planar Array 2x2 Elements Frekuensi 1,2 GHz untuk Penerima Video Wireless LCD Projector Muhammad Nur Tri Yuliarto; Agus Wagyana
Spektral Vol. 2 No. 1 (2021): April 2021
Publisher : Politeknik Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32722/spektral.v2i1.3801

Abstract

LCD projectors are widely used to support presentations on teaching and learning activities, meetings, seminars and so on. This study discusses the design and manufacture of a 2x2 planar array triangular patch microstrip antenna as a receiving antenna for wireless LCD projectors to overcome cable length limitations. The research method starts from the design, simulation of design results, fabrication, parameter measurement and antenna testing. The design was carried out using the CST Studio Suite application, then made on the FR-4 PCB. Testing includes measurement of antenna parameters and performance. In testing the antenna parameters, the values ​​obtained are in accordance with predetermined specifications, gain above 3 dB, VSWR below 2 dB, return loss below -10 dB and unidirectional radiation pattern. The antenna performance test results show that the quality of signal and video reception from the microstrip receiving antenna that has been made is still better than the default antenna for the receiver device.   Keywords: Microstrip triangular patch plannar 2x2 elements, wireless LCD projector
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

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.