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Rancang Bangun Spin Coater Vakum Chuck Berbasis Mikrokontroler dengan Tuning PID Metode Ziegler-Nichols Septiawan, Bayu; Mardiana, Laili; Hudha, Lalu Sahrul
Indonesian Journal of Applied Science and Technology Vol. 6 No. 1 (2025): Edisi Januari-Juni 2025
Publisher : Indonesian

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Spin coating is a thin-film deposition method that utilizes centrifugal force to produce uniform coatings; however, commercial instruments are expensive and therefore difficult to access for educational laboratories. This study aims to design and develop an ESP32-based spin coater equipped with a vacuum chuck system and motor speed control using a PID algorithm, with parameter tuning based on the Ziegler–Nichols method. The research methodology includes hardware and software design, component selection such as a brushed DC motor XD-3420, KY-003 Hall effect sensor, BTS7960 motor driver, and a vacuum system to hold the substrate. Performance testing was conducted through RPM sensor calibration, determination of optimal PWM frequency, and comparison between conventional control and PID control. The results show that the developed system is capable of reaching a maximum speed of 8500 rpm with a resolution of 0.1 rpm, linearity of 99.94%, and accuracy of 98.72% compared to a tachometer. The optimal operating frequency range of the system is 6000–8000 Hz with a sensitivity of 366.08 rpm/volt. PID control provides the best performance with a response time of 300 ms, an overshoot of 21.14%, and a steady-state error of 42.8 rpm. In conclusion, the proposed spin coater delivers precise and stable speed control, making it suitable for thin-film–based materials research in educational laboratories.
Penerapan teknologi sensor dan mikrokontroler pada eksperimen gerak jatuh bebas untuk pembelajaran fisika SMA Qomariyah, Nurul; Wirawan, Rahadi; Mardiana, Laili; Illahi, Ramadian Ridho; Budianto, Arif; Hudha, Lalu Sahrul; Lestari, Dwi Bayu
SELAPARANG: Jurnal Pengabdian Masyarakat Berkemajuan Vol 10, No 2 (2026): April
Publisher : Universitas Muhammadiyah Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31764/jpmb.v10i2.38702

Abstract

Abstrak Pembelajaran fisika di SMAN 1 Praya Barat sebagai salah satu sekolah mitra, selama ini cenderung bersifat kontekstual dan abstrak, sehingga berimplikasi pada lemahnya pemahaman konseptual dan minimnya keterampilan praktis siswa. Pengabdian masyarakat ini bertujuan mengembangkan perangkat eksperimen berbasis teknologi sensor dan mikrokontroler pada materi Gerak Jatuh Bebas (GJB) dan memberikan pelatihan dan pendampingan kepada guru untuk penggunaannya. Metode yang digunakan terbagi menjadi tiga tahapan yaitu: 1) tahap persiapan, merupakan langkah awal untuk menganalisis situasi pembelajaran Fisika di SMAN 1 Praya Barat, dan perancangan modul eksperimen oleh tim pengabdian, 2) tahap pelaksanaan, pengabdian dilaksanakan pada tanggal 28 Juli 2025, tahap ini dilakukan dengan pelatihan penggunaan modul sensor dan penggunaannya dalam eksperimen, dan 3) tahap evaluasi dilakukan untuk menilai efektivitas kegiatan, dengan melihat langsung, sedangkan data motivasi diukur menggunakan kuesioner. Hasil evaluasi menunjukkan bahwa penggunaan modul tersebut tidak hanya memfasilitasi pemahaman konsep fisika secara lebih mendalam dan komprehensif, tetapi juga meningkatkan keterampilan eksperimental dan motivasi belajar siswa. Di sisi lain, guru mendapatkan sebuah prototipe media pembelajaran inovatif yang aplikatif dan dapat dikembangkan lebih lanjut untuk materi fisika lainnya. Simpulan dari kegiatan ini adalah pendekatan eksperimen berbantuan teknologi berpotensi mengatasi tantangan pembelajaran fisika yang abstrak serta membangun dasar pemahaman konseptual yang lebih kokoh dibandingkan dengan metode kontekstual konvensional. Kata kunci: GJB; mikrokontroller; pembelajaran fisika; sensor. Abstract Physics learning at SMAN 1 Praya Barat, as one of the partner schools, has tended to be contextual and abstract, leading to weak conceptual understanding and a lack of students’ practical skills. This community service aims to develop experimental equipment based on sensor and microcontroller technology for the topic of Free Fall Motion (FFM) and to provide training and guidance to teachers on its use. The method used is divided into three stages: 1) the preparation stage, which is the initial step to analyze the physics learning situation at SMAN 1 Praya Barat and the design of the experiment module by the service team; 2) the implemntation stage, Implementation of the program on 28th July, 2025 where intervention is carried out through training on the use of sensor modules and their application in experiments; and 3) the evaluation stage, conducted to assess the effectiveness of the activity through direct observation, while motivation data is measured using questionnaires. Evaluation results show that the use of these modules not only facilitates a deeper and more comprehensive understanding of physics concepts but also enhances students’ experimental skills and learning motivation. On the other hand, teachers receive an innovative and applicable learning media prototype that can be further developed for other physics topics. The conclusion of this activity is that a technology-assisted experimental approach has the potential to overcome the challenges of abstract physics learning and buid a firmer foundation for conceptual understanding compered to conventional contextual methods. Keywords: FFM; microcontroller; physics learning; sensors.
Measurement of Volatile Organic Compound Concentrations in the Exhaled Breaths of Ulcer and Non-Ulcer Samples: A Breath Profiling Hadi, Kasnawi Al; Alhadawiah, Sabila; Budianto, Arif; Wirawan, Rahadi; Mardiana, Laili
Lambda: Jurnal Ilmiah Pendidikan MIPA dan Aplikasinya Vol. 6 No. 1 (2026): April
Publisher : Lembaga Bale Literasi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58218/lambda.v6i1.2733

Abstract

VOCs in exhaled breath have been shown to have diagnostic value for various respiratory diseases such as chronic obstructive pulmonary disease, asthma, and interstitial pneumonia. In diseases such as ulcers, increased levels of certain VOCs are caused by metabolic changes or abnormalities in the gut microbiome that contribute to disease symptoms. In line with this, this study aims to identify VOCs in the breath of people suffering from ulcer and non-ulcer samples (pre-clinical), using the CCS811 sensor. The methods used are clean air (calibration) and formaldehyde gas (examination) measurement inside an exposure chamber for 100 seconds. Then, the breath samples were collected and analyzed to measure the VOC concentrations. The differences in VOC concentration levels detected in breath samples in the two classifications were obtained. Breath samples from ulcer samples tend to show higher VOC concentrations than non-ulcer samples. These results show that there is a relationship between VOC concentration levels in the ulcer samples. The non-ulcer samples tends to be more stable and has lower VOC concentration levels. The increase in VOC levels is caused by changes in metabolism or abnormalities in the gut microbiome. The ANOVA results showed that there were significant differences between the ulcer and non-ulcer samples.
Integration of Electrostatic Precipitator-Ionizer-HEPA Filter for a Low Power Air Filtration System Budianto, Arif; Andini, Mira; Hadi, Kasnawi Al; Mardiana, Laili; Qomariyah, Nurul; Hudha, Lalu Sahrul; Devitanala, Titi
Lambda: Jurnal Ilmiah Pendidikan MIPA dan Aplikasinya Vol. 6 No. 1 (2026): April
Publisher : Lembaga Bale Literasi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58218/lambda.v6i1.2744

Abstract

Air pollution has become an important issue due to its impacts on human health and the environment. Especially indoor air pollution has more attached many concerns because humans also spend their time every day indoors. Indoor air pollutants in terms of particulate matter (PM) in different size distribution and gasses come from different sources such as smoke, hair spray, mosquito disinfectant, cooking, etc. The air purifier has become popular in the pandemic era at the being. In this research, we developed an indoor PM purification system technology by integrating three filtering methods: HEPA filter, electrostatic precipitator, and an ionizer to clean air by reducing PM concentration. The purpose of this study is to obtain the indoor purification system capable of cleaning non-bioaerosol PMs. The investigation was conducted in a chamber using several particulate matter sources. From both PM sources, it can be concluded that the purification system works well to purify the air in the tested chamber. The measurements of the different PM size distribution concentrations show that the system has the purification efficiency of 90±1% (non-bio fine particle) and 91±1% (non-bio coarse particle).