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All Journal Jurnal Ilmiah Teknologi dan Komputer (JITTER)
Muhammad Gald Teary
Universitas Indo Global Mandiri
Computer Science & IT

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Analysis of the Sensitivity of the SW-420 Vibration Sensor to Minor Mechanical Disturbances in the Safe Security System Naila Cahaya Putri; Tasmi; Muhammad Gald Teary
JITTER: Jurnal Ilmiah Teknologi dan Komputer Vol. 6 No. 3 (2025): JITTER Vol.6, No.3, December 2025
Publisher : Program Studi Teknologi Informasi, Fakultas Teknik, Universitas Udayana

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Abstract The security of assets in closed storage such as safes faces challenges in the form of illegal unit removal and physical manipulation. This study aimed to design and evaluate an anti-theft alarm system based on the Arduino Uno microcontroller with an SW-420 vibration sensor. The approach used was a laboratory experimental method focusing on testing the system's responsiveness to low-intensity mechanical interference or "Level Easy". The results showed that the integration of the SW-420 sensor, relay module, and buzzer successfully detected physical anomalies in real-time with a response time of less than one second. The implementation of the pulseIn() function in the programming logic proved effective in processing digital vibration signals into accurate alarm activation instructions. Threshold adjustments via potentiometers and the application of debouncing methods successfully minimized the potential for false alarms. In conclusion, this prototype demonstrated high reliability as an independent and portable early warning system for the protection of static assets.  Keywords : Arduino Uno, SW-420 Sensor, Safe Security, Vibration.
Design and Implementation of Automatic Fan Control System Based on Room Temperature Using Microcontroller-Based LM35 Sensors Rangga Aditiawarman; Tasmi; Muhammad Gald Teary
JITTER: Jurnal Ilmiah Teknologi dan Komputer Vol. 6 No. 3 (2025): JITTER Vol.6, No.3, December 2025
Publisher : Program Studi Teknologi Informasi, Fakultas Teknik, Universitas Udayana

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Room temperature control is an important aspect in maintaining user comfort and ensuring the efficient performance of electronic devices in enclosed spaces. Manual fan operation is considered ineffective because it cannot respond promptly to temperature changes and may lead to energy inefficiency. Therefore, this study aims to design and implement an automatic fan control system based on room temperature using an LM35 temperature sensor and an Arduino Uno microcontroller. The control method applied is threshold-based control, in which the fan automatically turns on or off according to a predefined temperature limit. The system consists of an LM35 sensor for temperature sensing, a microcontroller for data processing, a relay module as the actuator controller, a DC fan as the cooling device, and an I2C-based LCD as the display unit. System testing was conducted in an enclosed room with naturally varying temperature conditions. The experimental results show that the system is capable of reading room temperature stably and in real time, displaying temperature data clearly, and controlling the fan automatically and consistently according to the room temperature conditions. Based on its performance, the proposed system can be considered a simple, efficient, and easily applicable solution for room temperature control in small- to medium-scale enclosed environments. Keywords: temperature control, automatic fan, LM35 sensor, microcontroller, embedded system.
Co-Authors Naila Cahaya Putri Rangga Aditiawarman Tasmi