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All Journal Jurnal Informatika dan Teknik Elektro Terapan METHOMIKA: Jurnal Manajemen Informatika & Komputerisasi Akuntansi INTECOMS: Journal of Information Technology and Computer Science Ensiklopedia of Journal Minda Baharu YUME : Journal of Management Instal : Jurnal Komputer Jurnal Teknik Mesin Journal of Innovation Research and Knowledge Jurnal Teknologi dan Vokasi
Hafni Hafni
INSTITUT TEKNOLOGI PADANG
Arts Humanities Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Health Professions Industrial & Manufacturing Engineering Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mechanical Engineering Social Sciences Other

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PERANCANGAN SISTEM MONITORING LEVEL AIR MENGGUNAKAN SENSOR ULTRASONIK BERBASIS IOT DENGAN APLIKASI BLYNK Hasanah, Annisa Putri; Sarif, Muhammad Irfan; Hafni, Hafni
Jurnal Informatika dan Teknik Elektro Terapan Vol. 13 No. 2 (2025)
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jitet.v13i2.6485

Abstract

Abstrak. Pemantauan dan pengendalian level air dalam tangki penyimpanan secara manual sering kali tidak efisien dan berisiko menyebabkan air yang terbuang sia sia. Oleh karna itu, penelitian ini mengembangkan sistem monitoring berbasis Internet of things menggunakan ESP32, sensor ultrasonik, dan relay, dengan aplikasi Blynk serrta Telegram sebagai media pemantauan dan notifikasi. Sistem ini memungkinkan pengguna untuk melihat level air secara real-time dan mengontrol pompa air secara otomatis atau manual melalui aplikasi.Pengujian sistem menunjukkan bahwa snesor ultrasonik memiliki akurasi tinggi dalam mendeteksi level air, sementara sistem kendali pompa berbasis relay bekerja dengan baik dalam mengisidan menghentikan aliran air sesuai dengan batas yang telah ditentukan. Dengan adanya sistem ini, pengguna dapat lebih mudah mengontrol ketersediaan air dan menghindari pemborosan.  Abstract. Manual monitoring and control of the water level in the storage tank is often inefficient and risks causing wasted water. Therefore, this research developed an Internet of things-based monitoring system using ESP32, ultrasonic sensors, and relays, with the Blynk application as Telegram as a monitoring and notification medium. The system allows users to view the water level in real-time and control the water pump automatically or manually through the app.System testing shows that ultrasonic sensor have high accuracy in detecting water levels, while relay-based pump control systems work well in filling and stopping the water flow according to predetermined limits. With this system, users can more easily control water availability and avoid waste.
PENINGKATAN KOMPETENSI GURU DI ERA 4.0 MELALUI TRANSFORMASI DIGITAL: PENGEMBANGAN LKPD INTERAKTIF BERBASIS RME DAN BUDAYA MANDAILING Nurdalilah, Nurdalilah; Harahap, Adek Nilasari; Lubis, Susi Sulastri; Hafni, Hafni; Harahap, Tinur Rahmawati
MINDA BAHARU Vol 9, No 2 (2025): Minda Baharu
Publisher : Universitas Riau Kepulauan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33373/jmb.v9i2.8301

Abstract

Kegiatan Pengabdian kepada Masyarakat (PKM) ini bertujuan meningkatkan kompetensi guru dalam mengembangkan LKPD interaktif berbasis Realistic Mathematics Education (RME) yang dipadukan dengan nilai budaya Mandailing untuk memperkuat pembelajaran kontekstual di era 4.0. Kegiatan dilaksanakan selama tiga hari, meliputi tahap persiapan (6 Agustus 2025), pelaksanaan workshop dan pendampingan (7–8 Agustus 2025), serta evaluasi. Sebanyak 25 guru SMP Negeri 4 Angkola Timur berpartisipasi aktif dalam pelatihan yang menekankan praktik langsung menggunakan aplikasi digital seperti Canva dan Liveworksheet. Hasil kegiatan menunjukkan peningkatan kemampuan guru dalam merancang LKPD digital yang menarik dan relevan bagi siswa. Evaluasi menunjukkan tingkat pemahaman peserta sebesar 88,75%, penyampaian materi 89,10%, dan praktik 87,80%, dengan peningkatan kompetensi rata-rata 32% berdasarkan hasil pre-test dan post-test. Peserta memberikan tanggapan positif dan merasa kegiatan ini memberikan manfaat nyata bagi peningkatan profesionalisme dan kreativitas mereka. Secara keseluruhan, kegiatan PKM ini berhasil memperkuat literasi digital guru, menumbuhkan kemampuan inovatif dalam pembelajaran berbasis konteks lokal, serta menjadi langkah awal dalam membangun ekosistem pendidikan yang adaptif, kolaboratif, dan berkelanjutan.
SIFAT MEKANIK KOMPOSIT ARANG AKTIF BERBAHAN DASAR LIMBAH CANGKANG KEMIRI DAN RESIN EPOKSI Pratiwi, Putri; Nurzal, Nurzal; Hafni, Hafni; Perdana, Mastariyanto
Jurnal Teknologi dan Vokasi Vol 4 No 1 (2026): Jurnal Teknologi dan Vokasi
Publisher : ITP Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21063/jtv.2026.4.1.%p

Abstract

This study investigates the effect of weight fraction in an epoxy-based composite reinforced with candlenut shell charcoal powder on mechanical properties, specifically shear strength and flexural strength. The filler consisted of candlenut shell charcoal powder with a particle size of 841 to 1190 μm. The candlenut shell charcoal to epoxy matrix ratios were varied at 55:45 %wt, 60:40 %wt, 65:35 %wt, 70:30 %wt, 75:25 %wt, 80:20 %wt, and 85:15 %wt. Composite specimens were prepared by homogeneous mixing, molding, and followed by room-temperature curing before mechanical testing. Mechanical characterization was conducted through flexural and shear tests using a Universal Testing Machine (UTM) with appropriate fixtures for each test method. The results indicate that increasing the filler fraction tends to reduce the mechanical performance of the composites. The highest flexural strength was obtained at 55:45 %wt by 16.63 MPa, while the lowest value was recorded at 85:15 %wt by 4.88 MPa. The highest shear strength also occurred at 55:45 %wt by 8.87 MPa and reached the minimum at 80:20 %wt by approximately 1.65 MPa, with a sharp decrease observed at 70:30 %wt. Overall, the findings demonstrate that increasing the candlenut shell charcoal powder fraction decreases both flexural and shear strengths. This degradation at high filler loadings is associated with reduced epoxy wetting of particles, increased agglomeration and porosity, and weakened load transfer across the filler–matrix interface. These results suggest that the composite formulation requires an optimum filler fraction and careful control of mixing and molding processes to achieve more stable mechanical performance.
Co-Authors Alfith Alfith Amin, Muhammad Amin Andrean, Andrean Akbar Permana Asmara Yanto Darmeli Nasution Eva Darnila Fajri, Riyadhul Fitriana dewi Hadi Perkasa, Mego Harahap, Adek Nilasari Harahap, Tinur Rahmawati Hasanah, Annisa Putri Hendrawan, Jodi Herdianto Herdianto, Herdianto Hidayanti, Nurul Lubis, Susi Sulastri Mastariyanto Perdana Mawar Hayati Milanisi, Italiani Muhammad Zen, Muhammad Munar Munar Nofriady Handra, Nofriady Nur Asmi Nurdalilah, Nurdalilah Octavianty, Hany Putri Pratiwi Rifqi, Rifqi Romi Romi, Romi Rudianto Rudianto Sarif, Muhammad Irfan Syahpita Tarigan, Junusdad Syahrul R, Syahrul Yasni, Yasni Yulianti, Lusi Yusrawati Yusrawati