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All Journal SEMIRATA 2015 Journal of Applied Geospatial Information Journal of Technomaterial Physics Journal of Computation Physics and Earth Science
Marhaposan Situmorang, Marhaposan
Departemen Fisika FMIPA USU, Medan
Astronomy Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Materials Science & Nanotechnology Physics

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SISTEM PENGATURAN SUHU PADA RUANG PENGERINGAN BAHAN PANGAN BERBASIS MIKROKONTROLER AT89S51 DAN PC. Situmorang, Marhaposan
SEMIRATA 2015 Prosiding Bidang Fisika
Publisher : SEMIRATA 2015

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (378.101 KB)

Abstract

Telah dikonstruksi sebuah ruang pengeringan bahan pangan dimensi 50x20x30 cm. Ruangan dilengkapi dengan pemanas, sensor suhu LM35, motor, blower dan kipas. Jangkauan operasi pemanasan (suhu batas atas dan bawah) dapat diubah menggunakan PC yang datanya dikirim ke mikrokontroler melalui standar serial RS232. Berdasarkan data dari PC, mikrokontroler akan membandingkannya dengan nilai suhu yang diukur oleh LM35 dan selanjutnya akan menghidupkan/mematikan pemanas, menutup/membuka pintu dan mematikan/menghidupkan blower. Hasil pengeringan pada bahan pangan jamur kuping menunjukkan bahwa warna dan kualitas bahan sangat dipengaruhi oleh nilai jangkauan operasi  suhu pengeringan, besarnya  daya yang diberikan pemanas dan  lama pengeringan. Kata kunci: Sistem Pengeringan,Mikrokontroler AT89S51, RS232.
Design and Development of A Digital Soil Temperature Monitoring System Based on The Internet of Things at North Sumatra Climatological Station Manurung, Royston; Nasution, Tulus Ikhsan; Humaidi, Syahrul; Saragih, Immanuel Jhonson A.; Hibatullah, Khindi Aufa; Situmorang, Marhaposan; Darmawan, Yahya
Journal of Applied Geospatial Information Vol 7 No 2 (2023): Journal of Applied Geospatial Information (JAGI)
Publisher : Politeknik Negeri Batam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30871/jagi.v7i2.6545

Abstract

Soil temperature is a crucial parameter in monitoring and understanding climate and soil ecosystems. It plays a vital role in various environmental aspects, including agriculture, ecology, and geoscience. Monitoring soil temperature is necessary for planning and managing agriculture and natural resources. Currently, temporal observations of soil temperature by BMKG are limited, conducted only at 07:55, 13:55, and 18:55 local time. This limitation makes it difficult to perform detailed soil temperature analysis. This research was conducted to design a digital soil temperature monitoring device accessible via the internet. Seven DS18B20 sensors were used at depths of 0 cm, 2 cm, 5 cm, 10 cm, 20 cm, 50 cm, and 100 cm, combined with an ESP8266 module using the Arduino system. The implementation of this design resulted in a real-time soil temperature monitoring system with data updates every 10 seconds. The observed data are displayed on a 20x4 LCD and sent to the cloud, making them accessible on the webpage http://monitoringsuhutanah.my.id. Calibration results indicate that the DS18B20 sensors used in this study provide accurate and consistent temperature measurements, with an average correction range of (-0.20) to 0.24, thus suitable for operational use. Field tests show that the digital data are accurate and correspond (linearly correlate) with conventional data. This is based on a correlation value of 0.7, while the RMSE values range from 0.5 to 2.18 and the bias ranges from (-0.69) to 0.08.
Designing Motorcycle Safety System Using Fingerprint Sensor, SMS Gateway, and GPS Tracker Based on ATMega328 Situmorang, Marhaposan
Journal of Technomaterial Physics Vol. 3 No. 1 (2021): Journal of Technomaterial Physics
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jotp.v3i1.5547

Abstract

A motorcycle security system has been designed using an ATMega328 microcontroller by applying fingerprint, SMS and GPS. The system consists of a GPS Module and a SIM Module. The system is designed to find the position of a stolen motorcycle via a Google Maps and create a security system on a motorcycle that uses a fingerprint sensor as a substitute for the key to turn on and turn off the motorcycle engine. ATMega328 is used as a processor, with additional GPS, GSM SIM 8000I, relay and buzzer. When a theft occurs, the system will send an SMS contained Google Maps link to the owner of the motorcycle. The results of the system design are expected to minimize the crime rate in motor vehicle theft cases.
Solar Power-Based Thermo Electric Cooler (TEC) System Situmorang, Marhaposan; Panjaitan, Monika
Journal of Technomaterial Physics Vol. 3 No. 2 (2021): Journal of Technomaterial Physics
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jotp.v3i2.5624

Abstract

Solar energy has been considered as a promising renewable energy source for electric power generation. Solar panel systems have become a popular object to be developed by researchers, but the low efficiency of solar panels in energy conversion is one of the weaknesses of this system. Factors that affect the output produced by solar panels are the intensity of sunlight and the working temperature of the solar panels. The solar panel module has a single operating point where the voltage and current outputs produce the maximum power output. There are three main methods in Maximum Power Point Tracking (MPPT), namely conventional methods, artificial intelligence methods, and hybrid methods. In most solar panel systems, this study uses Maximum Power Point Tracking (MPPT) with perturb and observe algorithms to maximize the use of solar energy. The maximum power point extracted by MPPT will be supplied to the battery and controlled by the Charge Controller. The energy stored in the battery will be used by the Thermo Electric Cooler cooling system to reach the desired temperature point using the keypad as temperature input.
Analisis Pemisahan Gelombang Geser di Bawah Daerah Busur Vulkanik Sumatra yang Diperoleh dari Stasiun Jaringan Seismik Broadband. Ristiyono, Lewi; Nurfaizah, Chichi; Purba, Suhenri; Situmorang, Marhaposan
Journal of Computation Physics and Earth Science (JoCPES) Vol 1 No 1 (2021): Jurnal Fisika Komputasi dan Ilmu Kebumian
Publisher : Yayasan Kita Menulis - JoCPES

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53842/04wbc932

Abstract

The observation of broadband network seismic had been deployed in Sumatra For-Arc. The waveform data for this study were recorded from January 2014 – December 2016. The earthquake event data were selected with the epicenter of around 950 – 1800 in distance and Magnitude with more than 7 Mw. In this case, we use shear wave splitting to determine an anisotropic structure in Sumatra For-arc. Seismic Anisotropy can perform as a tool to classify and observe anisotropic structures of subsurface deformation processes beneath Sumatra For-Arc. The valid outcomes, in this case, have been gained that they only correspond to the upper layer, which has the delay time duration of 0.5 – 0.8 s is the anisotropic layer located in the Mentawai Island. The fast an anisotropic polarization direction found in Sumatra For-arc are parted into NE-SW direction found on the upper layer.
Co-Authors Hibatullah, Khindi Aufa Manurung, Royston Nurfaizah, Chichi Panjaitan, Monika Purba, Suhenri Ristiyono, Lewi Saragih, Immanuel Jhonson A. Syahrul Humaidi, Syahrul Tulus Ikhsan Nasution Yahya Darmawan