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All Journal Journal of Technomaterial Physics Instal : Jurnal Komputer Jurnal Pengabdian Kepada Masyarakat dan Desa (PASSA)
Ryandika Afdila, Ryandika
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Agriculture, Biological Sciences & Forestry Astronomy Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Electrical & Electronics Engineering Energy Materials Science & Nanotechnology Physics

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Journal : Journal of Technomaterial Physics

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Liquid Fertilizer Solution Stirring Tool Using Arduino Uno Microcontroller Muhammadin Hamid; Aritonang, Endah Sharon; Cholillah, Putri; Afdila, Ryandika; Wijoyo, Hadi
Journal of Technomaterial Physics Vol. 7 No. 1 (2025): Journal of Technomaterial Physics
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jotp.v7i1.19854

Abstract

Automatic fertilizer mixing is required to minimize fertilizer and water mixing time because manual liquid mixing takes a long time. The fertilizer used is liquid, often known as effective microorganisms 4 (EM4) solution. To perfect the stirrer, which is still rotated manually, the DC motor provides speed control for the automatic liquid fertilizer mixer. The speed can be reduced by utilizing the Arduino Uno microcontroller so that the motor rotates according to the required speed. The main mechanical components consist of a DC motor, Arduino Uno as a microcontroller, a power supply as a source of electric current, and a container for mixing liquid fertilizer. The infrared (IR) sensor achieved high accuracy in measuring mixer rotational speed for EM4 fertilizer, with percentage errors ranging from 0.2% to 1.8% compared to tachometer readings. However, when applied to green fertilizer, the error rates varied widely, from 0.03% up to 28.05%, indicating significant fluctuations. These results highlight that the IR sensor is quantitatively reliable for EM4 fertilizer applications but requires further calibration to ensure consistent performance with other fertilizer types
Development of a Two-Layer Secure IoT Locker System Using e-KTP RFID and Mobile OTP via Blynk Platform Handasah, Ummu; Afdila, Ryandika; Sani, Arman; Hendrawan, Rizky; Hamid, Muhammadin
Journal of Technomaterial Physics Vol. 7 No. 2 (2025): Journal of Technomaterial Physics
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jotp.v7i2.22170

Abstract

The growing demand for safe storage in public places has highlighted the flaws of single-factor authentication methods such as RFID, which are vulnerable to cloning. This study solves these security weaknesses by building and implementing a safe, low-cost IoT locker with a strong two-factor authentication (2FA) mechanism. The suggested method combines Indonesia's national ID card (e-KTP) for initial RFID-based access with a dynamic One-Time Password (OTP) sent to the user's smartphone via the Blynk IoT platform. The NodeMCU ESP8266-based prototype underwent extensive reliability, performance, and security testing. The results showed that both e-KTP and OTP validation were 100% accurate. The performance research revealed an average OTP delivery time of 5.6 seconds and a total access time of 28.2 seconds. Crucially, security analysis confirmed that the required second factor (OTP) effectively prevented unauthorized access even when the e-KTP was cloned. This study confirms a realistic and scalable two-factor authentication system that considerably increases locker security over single-factor techniques.
Co-Authors Aritonang, Endah Sharon Arman Sani Cholillah, Putri Derry Wiliyanda Nasution Gea Geby Aurora Syafridon Habib Muharry Yusdartono Hamid, Muhammadin Handasah, Ummu Harahap, Muthiah Putrilan Hendrawan, Rizky Indra Jaya Indrayadi Muhammad Sukri Habibi Daulay Muhammadin Hamid Nasution, Tuti Adi Tama Tania Alda Wijoyo, Hadi