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All Journal Gravity : Jurnal Ilmiah Penelitian dan Pembelajaran Fisika Jurnal Pengabdian Masyarakat Bidang Sains dan Teknologi
Richard Semuel Waremra
Universitas Musamus
Aerospace Engineering Agriculture, Biological Sciences & Forestry Astronomy Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Dentistry Earth & Planetary Sciences Education Electrical & Electronics Engineering Engineering Health Professions Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mathematics Mechanical Engineering Medicine & Pharmacology Nursing Physics Public Health Transportation Veterinary

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PROFIL JENIS REPRESENTASI SISWA UNTUK MEMECAHKAN PERMASALAHAN DALAM PEMBELAJARAN FISIKA Richard Semuel Waremra; Merta Simbolon; Syamsul Bahri; Oswaldus Dadi
Gravity : Jurnal Ilmiah Penelitian dan Pembelajaran Fisika Vol 7, No 1 (2021)
Publisher : Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30870/gravity.v7i1.9567

Abstract

This study aimed to determine the profile of the type of representation of students to solve problems in learning physics. This type of research is descriptive quantitative. The sample used in this study was 170 high school and vocational high school students in the Merauke district, and the sampling technique used was purposive sampling. The instrument used in this study was a problem-solving ability test instrument using a multimode representation by the Rosengrant stage and a questionnaire instrument for student responses to various types of representation in physics. The results showed that students could only use a single representation in the form of text, image, and mathematical representations. There are no students who can use the representation of line diagrams, bar charts, and free-body diagrams. The students' questionnaire responses showed that students used different representations in understanding the concept, and the type of representation most used was text representation.
Rancang Bangun dan Implementasi Sistem Lonceng Gereja Berbasis Digital di Gereja GPI Papua Jemaat Kristus Mopah Lama Richard Semuel Waremra; Daniel Parenden
ABDIKAN: Jurnal Pengabdian Masyarakat Bidang Sains dan Teknologi Vol. 5 No. 3 (2026): Agustus 2026
Publisher : Yayasan Literasi Sains Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55123/abdikan.v5i3.7482

Abstract

This community service project designed and implemented a digital church-bell system at GPI Papua Jemaat Kristus Mopah Lama (Merauke, South Papua, Indonesia). The partner previously relied on fully manual bell operation, which often caused delays when the responsible operator was unavailable. The proposed solution integrates an Arduino Mega 2560 controller, a 4×4 matrix keypad for command input, a 16×2 I2C LCD for menu/status display, and a DFPlayer Mini module to play pre-recorded bell and announcement tones stored on a microSD card. The audio output is fed to a PA amplifier and broadcast through a horn speaker installed on the church tower. Implementation stages included needs assessment, hardware–software development, panel assembly, on-site installation, functional testing, and operator training accompanied by an operating and maintenance SOP. Black-box tests confirmed that each keypad command reliably triggered the intended sound sequence, while reset and basic electrical protections functioned properly. The system reduces dependency on a single operator, improves the timeliness of worship calls, and is replicable using affordable off‑the‑shelf components.
Co-Authors Daniel Parenden Merta Simbolon Oswaldus Dadi Syamsul Bahri