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All Journal Jurnal Fisika Unand Jurnal Ilmu Fisika
Aldo Novaznursyah Costrada
Department Of Physics, Faculty Of Mathematics And Natural Science, Universitas Andalas, Padang.
Astronomy Earth & Planetary Sciences Electrical & Electronics Engineering Energy Materials Science & Nanotechnology Physics

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Karakterisasi nRF24L01+ dengan Kondisi Line of Sight dan Non-Line of Sight untuk Sistem Monitoring Bencana Banjir Muhamad Iqbal; Aldo Novaznursyah Costrada; Harmadi Harmadi
Jurnal Fisika Unand Vol 11 No 1 (2022)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2026.137 KB) | DOI: 10.25077/jfu.11.1.50-56.2022

Abstract

Penelitian tentang karakteriasasi nRF2L01+ dengan kondisi line of sight dan non-line of sight untuk sistem monitoring bencana banjir. Penelitian dilakukan untuk melihat kemampuan transceiver nRF24L01+ dalam menstranmisikan data untuk sistem monitoring bencana banjir. Karakterisasi nRF24L01+ dilakukan di Pantai Air Manis, Jalan Bypass untuk kondisi line of sight, Jalan di Universitas Andalas, Perlintasan kereta api Alai Padang untuk kondisi non-line of sight. Hasil karakterisasi transceiver nRF24L01+ kondisi line of sight di Pantai Air manis sejauh 789,6 m dan 0,09 μtesla, di Jalan Bypass 268 m dan 1,74 μtesla. Kondisi non-line of sight di jalan di Universitas Andalas 318, 7 m dan 0,03 μtesla.Perlintasan kereta api Alai 127,94 dan 6,47 μtesla. Kondisi line of sight, non-line of sight dan noise medan elektromagnetik sangat mempengaruhi jarak transmisi data. Sistem transmisi menggunakan transceiver nRF24L01+ dapat digunakan pada sistem monitoring bencana banjir berdasarkan kekeruhan air sungai.
Rancang Bangun Sistem Peringatan Dini Pada Perlintasan Kereta Api Berbasis Sensor Serat Optik dan Transceiver nRF24L01+ Aldo Novaznursyah Costrada; Harmadi Harmadi
Jurnal Fisika Unand Vol 8 No 3 (2019)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (841.076 KB) | DOI: 10.25077/jfu.8.3.234-239.2019

Abstract

Telah dirancang sistem peringatan dini pada perlintasan kereta api menggunakan sensor serat optik dengan metode ekstrinsik.  Sensor serat optik digunakan untuk mengukur frekuensi dan amplitudo getaran rel kereta api dengan memanfaatkan perubahan tegangan keluaran dari fotodetektor OPT101. Data getaran dikirim dari sensor serat optik ke sistem peringatan dini menggunakan Transceiver nRF24L01+.  Rancang bangun sistem peringatan dini ini terdiri dari sumber cahaya berupa dioda laser, serat optik FD-620-10, fotodioda OPT 101, Arduino Uno sebagai unit pemrosesan sinyal, buzzer sebagai alarm untuk menghasilkan bunyi peringatan,dan LCD sebagai penampil teks peringatan. Hasil pengujian dan analisis data yang telah dilakukan terhadap jarak optimal antara ujung serat optik dengan rel kereta api yaitu 3 mm. Jarak maksimum dari pengiriman data Transceiver nRF24L01+ adalah 604 m tanpa penghalang dan 232 m dengan penghalang.  Dalam skala laboratorium, hasil pengukuran frekuensi getaran dengan alat yang dikembangkan dibandingkan dengan function generator, diperoleh kesalahan rata-rata sebesar 0,55 %.Kata kunci: frekuensi, getaran, dioda laser, serat optik
Prototype of Rainfall Intensity Measurement Using CCD TSL1401CL Linear Sensor Array Sixtinah Deswilan; Aldo Novaznursyah Costrada; Harmadi Harmadi
Jurnal Ilmu Fisika Vol 13 No 1 (2021): March 2021
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jif.13.1.18-25.2021

Abstract

A prototype measurement of rainfall intensity was developed using a CCD TSL1401CL linear sensor array. The prototype consists of a He-Ne laser that functions as a light source, which later is focused by the beam expander and conditioned by a convex lens. Each pixel will receive the same voltage depending on the light intensity so that it produces a decimal value of ADC. This ADC decimal value determines rainfall intensity based on the diameter and velocity of the raindrops. The diameter variations used ranges from 1 mm to 10 mm, while for variations in the height of rainfall are 50 cm, 100 cm, and 150 cm. The test results proved that the greater the decimal value of the ADC is, the smaller the diameter of the raindrops detected will be, and vice versa. The values of the diameter and velocity of were used to obtain the value of rainfall intensity. The percentage value of error measuring rainfall intensity is 3.11% when compared to the rain gauge module is still considered rather accurate. However, direct testing is still needed when rain falls with various types and intensities.  
Characterization of Multiple-bend Optical Fiber Extensometer Design for Landslide Sensor Aldo Novaznursyah Costrada; Sixtinah Deswilan; Badrul Mustafa Kemal; Harmadi Harmadi
Jurnal Ilmu Fisika Vol 13 No 1 (2021): March 2021
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jif.13.1.1-7.2021

Abstract

Design of multiple-bend extensometer based on optical fiber as landslide sensor has been characterized. Multiple-bending characterization has been done by varying the winding number of optical fiber FD-620-10 to obtain the photodiode's effective light intensity.  The light intensity in the extensometer was set by varying the laser diode resistance in the range (150 – 250) Ω.  The optimum sensitivity of 0.03984 V/cm was obtained for triple winding of optical fiber. The designed optical extensometer is able to monitor the displacement with an error of 0.59%. This result indicates that the designed extensometer is the more bending on optical fiber, the more its sensitivity and the bending loss.
Co-Authors Harmadi Harmadi Kemal, Badrul Mustafa Muhamad Iqbal Sixtinah Deswilan Sixtinah Deswilan