Abstract
Sound distribution and background noise, is an important aspect in the making of study-purposed room. Properly distributed sound would ensure everyone in the room to hear the same quality of sound. Good sound quality is defined as a sound that did not diminish its character (sound intensity and sound clarity) significantly to its sound source. In this research, has been fabricated an in-room sound distribution measuring instrument, based on the Arduino microcontroller that equipped with nRF24L01 to be wirelessly functionated. The fabricated measuring instrument consist of 4 transmitter devices and 2 receiver devices. The transmitter devices is an Arduino Pro Mini microcontroller that equipped with nRF24L01 and a sound sensor. The receiver devices is an Arduino Nano microcontroller equipped with nRF24L01, that connected to a PC, and an Arduino Pro Mini microcontroller equipped with nRF24L01 that connected to a speaker. The fabricated measuring instrument equipped with a Python 2.7-based acquisition software to acquire data in real time and store it in CSV (Comma Separated Value) format. Test was carried out to the transmitter devices that equipped with a sound sensor and the receiver device that connected to a speaker. The transmitter devices was compared with a standard sound level meter, and showed 0,65% - 1,24% of error percentage. The test made to receiver device showed that sound intensity of 100 dB could only be achieved with frequency of 2000 Hz and 3000 Hz. On the measurement of sound distribution, the primary data of Einstein Hall sound distribution has been obtained, with 16 sound level measuring point, 7 variations of sound source position, and 5 variations of sound source frequency.The background noise measurement of Einstein Hall of the FMIPA ULM, showed the value varied between 57 dB – 60,56 dB.
Highlights
Distribusi bunyi merupakan salah satu aspek penting dalam pembuatan sebuah ruang pada bangunan (Szelag & Flaga, 2015)
Properly distributed sound would ensure everyone in the room to hear the same quality of sound
Good sound quality is defined as a sound
Summary
Edisi Khusus Volume 1, Nomor 1, Januari 2019 ISSN : 1829-796X (print); 2514-1713(online) https://ppjp.ulm.ac.id/journal/index.php/f/. Pembuatan Alat Ukur Distribusi Bunyi dalam Ruang, secara Nirkabel Berbasis Mikrokontroler. Penelitian ini bertujuan untuk membuat sebuah rancang bangun alat ukur distribusi bunyi dalam ruang, yang terintegrasi dengan speaker dan dapat mengirimkan data pengukuran secara real time dan nirkabel. Alat ukur distribusi bunyi ini dibuat menggunakan sensor mikrofon elektret, mikrokontroler, speaker dan modul wireless nRF24L01. Pembuatan alat ukur distribusi bunyi dalam ruang, dilakukan di Laboratorium Instrumentasi Fisika FMIPA ULM. Perakitan perangkat keras dilakukan dengan membuat perangkat penerima data, perangkat sensor suara, dan perangkat speaker. Karakterisasi perangkat speaker dilakukan dengan membandingkan pembacaan pada SLM standard dan voltmeter. Aula Einstein FMIPA ULM, dengan 16 titik pengukuran tingkat intensitas bunyi, 7 variasi posisi sumber bunyi, dan 5 variasi frekuensi sumber bunyi, seperti pada Gambar 3. Hasil karakterisasi dari 4 unit perangkat sensor suara ini menghasilkan grafik seperti pada Gambar 5, Gambar 6, Gambar 7, dan Gambar 8. Persamaankarakteristik inimengubah nilai pembacaan bit ADC menjadi nilai tingkat intensitas bunyi. 3.3 Perangkat Lunak Antarmuka ke PC
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