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DESAIN UNTUK HOT PLATE MAGNETIK STIRRER DENGAN MOTOR RPM TINGGI Muhammad Ulin Nuha ABA; Abdul Haris Kuspranoto; Muslihun; Riza Saktira P.S; Imam Tri Harsoyo
MEDIKA TRADA Vol 5 No 2 (2024): MEDIKA TRADA (JTEMP) Vol 5 No 2 (2024)
Publisher : LPPM POLBITRADA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59485/jtemp.v5i2.92

Abstract

Hotplate magnetic stirrer is laboratory equipment used to mix solutions to make them more homogeneous by utilizing a heater and magnetic rod controlled by a high RPM motor, as well as several other supporting components. All these components are assembled into one good tool. In order to produce a good magnetic stirrer hotplate tool, it is necessary to make a planning design to produce a magnetic stirrer hotplate tool that is ergonomic and functional. In designing this tool, several stages of literature study are carried out, designing the tool (to find out the various components needed), designing the tool using a computer, printing the tool, installing components and testing the electrical power of the tool. Based on these steps, the casing design for the Hotplate Magnetic Stirrer tool was successfully created with a length = 230 mm, width = 220 mm, and height = 156 mm. This casing design is able to accommodate all electronic and non-electronic components used, especially high RPM DC motors. It is proven that through this casing design, the high RPM DC motor and other components are installed (attached) well. It has also been confirmed that all installed electronic components have voltage according to their specifications. Keywords: Magnetic Stirrer Hotplate, Design, Motor, RPM, Components.
Linear Shaker Sebagai alat Laboratorium untuk Penghomogen Sampel Muhammad Daffa Mashari; Imam Tri Harsoyo; Patrisius Kusi Olla
Justek : Jurnal Sains dan Teknologi Vol 8, No 2 (2025): Juni
Publisher : Unversitas Muhammadiyah Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31764/justek.v8i2.31015

Abstract

Abstract:  This study aims to design, construct, and evaluate a prototype Arduino Uno–based Linear Shaker that integrates a moving rail with bearing mechanism, an optocoupler sensor for real-time RPM feedback, and a Nextion LCD interface for speed and duration control. A Research and Development (R&D) methodology was employed, comprising field observations, literature review, device design, prototype fabrication, performance testing without load and with liquid loads (50–600 g), and performance data analysis. No-load testing demonstrated an average RPM measurement accuracy of 96 %, while loaded tests showed the prototype maintained stable rotations in the 100–129 RPM range across the tested load spectrum. The device also achieved continuous operation for up to 60 minutes without significant performance degradation. These results confirm that the Linear Shaker meets the targeted performance for light laboratory applications and provide a foundation for future enhancements, such as adopting a higher-torque stepper motor and upgrading the motion guide system with high-quality bearings to further increase load capacity and agitation efficiency.Abstrak: Penelitian ini bertujuan untuk merancang, membangun, dan mengevaluasi prototipe Linear Shaker berbasis Arduino Uno yang mengombinasikan mekanisme rel gerak dengan bearing, sensor optocoupler untuk pembacaan RPM real-time, serta antarmuka Nextion LCD untuk pengaturan kecepatan dan durasi agitasi. Metode penelitian menggunakan pendekatan Research and Development (R&D) yang meliputi observasi lapangan, studi pustaka, perancangan alat, pembuatan prototipe, pengujian kinerja tanpa beban dan dengan beban cairan (50–600 g), serta analisis data performa. Pengujian tanpa beban menunjukkan rata-rata akurasi pembacaan RPM mencapai 96 %, sedangkan pada pengujian beban, prototipe mempertahankan putaran stabil di kisaran 100–129 RPM dengan variasi beban yang diuji. Durasi operasi hingga 60 menit juga tercapai tanpa penurunan signifikan dalam performa. Hasil penelitian mengonfirmasi keberhasilan desain Linear Shaker dalam memenuhi target kinerja laboratorium ringan, sekaligus memberikan pijakan bagi pengembangan lebih lanjut, seperti penggunaan motor stepper berdaya lebih tinggi dan peningkatan sistem rel gerak dengan bearing berkualitas untuk meningkatkan kapasitas dan efisiensi agitasi.     
Alat Fetal Simulator Dengan LCD Nextion Achmad Labibul Umam; Imam Tri Harsoyo; Aggiat Winner; Wahyu Arief Purnomo
Justek : Jurnal Sains dan Teknologi Vol 8, No 2 (2025): Juni
Publisher : Unversitas Muhammadiyah Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31764/justek.v8i2.31021

Abstract

Abstract:  A Fetal Simulator is an instrument used to simulate calibrated heartbeats (BPM) to prepare a Fetal Doppler for operation. This study aims to design a fetal simulator prototype equipped with a more interactive Nextion LCD, which facilitates users in setting and monitoring the device’s operating parameters in real-time, as well as to conduct functional and comparative testing of the developed device. The research employs an experimental method with a design and development approach, focusing on the construction and refinement of the fetal simulator device. Functional testing results showed error rates of 5.4% at TP1 (battery input), 1.6% at TP2 (Nextion LCD input), 0.2% at TP3 (charger output), and 1.4% at TP4 (step-up output). Meanwhile, comparative testing using the Bistos BT-250 fetal Doppler demonstrated that the prototype successfully generated signals that were well detected by the reference device, within a BPM range of 30–240 as configured.Abstrak: Fetal Simulator adalah sebuah instrumen yang digunakan untuk mensimulasikan denyut jantung terkalibrasi (BPM) sehingga dapat mempersiapkan Fetal Doppler  untuk beroperasi. Penelitian ini bertujuan untuk merancang prototipe fetal simulator yang dilengkapi dengan LCD Nextion yang lebih interaktif dan memudahkan pengguna dalam mengatur serta memantau parameter kerja alat secara real-time. serta melakukan uji fungsi dan uji banding terhadap alat yang dikembangkan. Metode yang digunakan adalah penelitian eksperimental dengan pendekatan rancang bangun, yang berfokus pada perancangan dan pengembangan alat fetal simulator. Hasil uji fungsi menunjukkan tingkat kesalahan masing-masing pada TP1 (input baterai) sebesar 5,4%, TP2 (input LCD Nextion) sebesar 1,6%, TP3 (output charger) sebesar 0,2%, dan TP4 (output step up) sebesar 1,4%. Sementara itu, hasil uji banding dengan alat fetal doppler Bistos BT-250 menunjukkan bahwa prototipe mampu menghasilkan sinyal yang terdeteksi dengan baik oleh alat pembanding, dengan rentang BPM antara 30–240 sesuai dengan pengaturan yang ditentukan.