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All Journal Indonesian Journal of Innovation Studies Academia Open
Akhmad Ahfas
Program Studi Teknik Elektro, Universitas Muhammadiyah Sidoarjo
Computer Science & IT Education Engineering Law, Crime, Criminology & Criminal Justice Medicine & Pharmacology Public Health

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Blind Spot Detection System for Phinisi Ship Navigation Safety: Sistem Deteksi Titik Buta untuk Keselamatan Navigasi Kapal Phinisi Hanifah Burhanuddin; Akhmad Ahfas
Indonesian Journal of Innovation Studies Vol. 27 No. 1 (2026): January
Publisher : Universitas Muhammadiyah Sidoarjo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21070/ijins.v27i1.2076

Abstract

General Background Maritime tourism development increases the use of large vessels such as phinisi cruise ships which have operational safety challenges. Specific Background The large structure of phinisi ships creates blind spots that can lead to potential collisions with smaller vessels. Knowledge Gap Existing navigation systems have limited capability in detecting objects within blind spot areas in real-time. Aims This study aims to design and implement a blind spot sensing alert system using a laser distance sensor based on Arduino Uno. Results The developed system is capable of detecting object presence within blind spot areas and providing warning signals to assist navigation awareness. Novelty The integration of laser distance sensing with a simple microcontroller-based system provides a practical solution for blind spot monitoring on traditional vessels. Implications This system can support maritime safety by reducing collision risk and can be further developed for wider implementation in similar ship types. Keywords: Blind Spot Detection, Phinisi Ship, Laser Distance Sensor, Arduino Uno, Maritime Safety Key Findings Highlights System identifies object presence in blind navigation areas Warning mechanism supports real-time operator awareness Prototype demonstrates practical implementation on traditional vessel
IoT Based UV C Baby Equipment Sterilization System With Sensor Monitoring: Sistem Sterilisasi Peralatan Bayi Berbasis IoT dengan Sinar UV-C dan Pemantauan Sensor Muhammad Riko; Akhmad Ahfas
Indonesian Journal of Innovation Studies Vol. 27 No. 1 (2026): January
Publisher : Universitas Muhammadiyah Sidoarjo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21070/ijins.v27i1.2079

Abstract

General Background: Hygiene of baby feeding equipment is essential due to infants’ low immunity and high risk of bacterial contamination. Specific Background: Conventional cleaning and drying methods are often ineffective and less hygienic, while existing sterilization systems lack integrated remote monitoring. Knowledge Gap: Previous studies have not fully integrated UV-C sterilization, heating-based drying, and Internet of Things control in a single system. Aims: This study aims to develop an IoT-based UV-C sterilization device using ESP32 to monitor and control sterilization and drying processes. Results: The drying system reduced moisture to a completely dry state, while sterilization testing showed bacterial counts below SNI thresholds. The IoT system operated up to 60.2 km with an average delay of 4.86 seconds, and the DS18B20 sensor achieved an average error of 0.25°C. Novelty: The integration of UV-C sterilization, heating drying, and long-distance IoT control with real-time monitoring represents the main contribution. Implications: This system provides a practical and hygienic solution for maintaining baby equipment cleanliness with reliable remote operation Keywords: Uv C Sterilization, Internet of Things, Esp32, Baby Equipment, Temperature Sensor Key Findings Highlights Drying process achieves complete moisture removal after extended duration Bacterial testing confirms compliance with microbiological safety standards Remote operation remains stable across multiple long-distance locations
Component Tolerance and Performance of 2-Way Passive Crossovers: Toleransi Komponen dan Kinerja Penyeberang Pasif Dua Arah Akhmad Ahfas; Adriana Anteng Anggorowati; Dwi Hadidjaja R.S.
Academia Open Vol. 10 No. 2 (2025): December
Publisher : Universitas Muhammadiyah Sidoarjo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21070/acopen.10.2025.12997

Abstract

General Background: Passive 2-way crossover filters play a crucial role in dividing audio signals between woofer and tweeter channels, where their performance is highly dependent on the precision of passive components. Specific Background: Variations in capacitor and inductor values, along with their tolerances, can significantly alter crossover frequency, phase characteristics, and harmonic distortion, yet these effects are not fully quantified in practical implementations. Knowledge Gap: Limited studies provide an integrated empirical–analytical assessment of how component deviations influence frequency response, THD, and impedance stability in real passive 2-way filters. Aims: This study evaluates the influence of component tolerances on crossover frequency accuracy, filter slope behavior, phase stability, and distortion performance. Results: Experimental findings show that ±10–15% component deviations shift crossover frequency by 7.1–8.5%, reduce filter slope by 2.1–3.2 dB/octave, increase THD from 0.8% to 3.2% at 10W, and induce impedance fluctuations that shift the crossover point by an additional 3.2%. Inductors exhibit higher sensitivity (0.72–0.78) than capacitors (0.45–0.52). Novelty: This study provides a combined simulation–measurement analysis linking component tolerance to measurable acoustic deviations. Implications: The results highlight the need for ≤5% tolerance components and pre-assembly verification to ensure stable crossover performance. Highlights: Component tolerances significantly shift crossover frequency and reduce filter accuracy. Inductors have a stronger impact on system performance than capacitors. Using ≤5% tolerance components improves stability, distortion, and overall audio quality. Keywords: Passive Crossover Filter, Component Tolerance, Crossover Frequency Shift, Total Harmonic Distortion, Impedance Stability
Arduino Based Automated Shoe Cabinet Door System: Sistem Pintu Lemari Sepatu Otomatis Berbasis Arduino Moh Fakhri Hibatulloh; Akhmad Ahfas
Indonesian Journal of Innovation Studies Vol. 26 No. 2 (2025): April
Publisher : Universitas Muhammadiyah Sidoarjo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21070/ijins.v26i2.2177

Abstract

General Background: Home automation technology is increasingly utilized to support efficiency and convenience in daily activities through the integration of sensors, controllers, and actuators. Specific Background: Automatic door systems have been implemented in various applications, while the adoption of microcontroller-based automation for shoe cabinet access remains limited. Knowledge Gap: Previous studies mainly focused on automatic doors for buildings and access systems, with limited attention given to automated shoe cabinet door mechanisms using ultrasonic sensing and Arduino-based control. Aims: This study aimed to design and develop an Arduino Uno based automation system for opening and closing a shoe cabinet door using ultrasonic sensors as detection components and a servo motor as the driving mechanism. Results: The developed system successfully detected objects at predetermined distances, activated the servo motor to open the cabinet door at approximately 50 cm, and operated the blower through a relay when an object was detected at approximately 10 cm. Testing showed that the ultrasonic sensors, servo motor, and relay operated according to the programmed functions. Novelty: The proposed design applies ultrasonic sensor based automation and Arduino Uno control to a shoe cabinet door system integrated with a blower activation mechanism. Implications: The system demonstrates a practical application of microcontroller-based automation for household furniture, providing a simple approach for automated cabinet access and operation.Highlights: Object detection at approximately 50 cm triggered cabinet access through servo actuation. Distance sensing at approximately 10 cm activated blower operation via relay switching. Integrated hardware components functioned according to programmed control logic during testing. Keywords: Arduino Uno; Ultrasonic Sensor; Home Automation; Servo Motor; Automatic Cabinet Door
Co-Authors Adriana Anteng Anggorowati Dwi Hadidjaja R.S. Hanifah Burhanuddin Moh Fakhri Hibatulloh Muhammad Riko