Judul: Rancang Bangun Sistem Komunikasi Data Lokasi Robot Beroda dan Server Berbasis Wi-Fi Menggunakan Modul ESP8266
Abstrak: Robot beroda merupakan salah satu jenis robot yang banyak dikembangkan. Sistem komunikasi data antara robot dan server banyak diterapkan pada sistem kerjasama antar-robot, ketika robot memerlukan informasi terkait robot lainnya. Penelitian ini mengembangkan sistem komunikasi data nirkabel berbasis Wi-Fi menggunakan modul ESP8266. Data diambil menggunakan modul GPS Ublox Neo 6MV2 yang terhubung dengan satelit lalu dikirim dan disimpan di server untuk kemudian digunakan sesuai kebutuhan. Selanjutnya, pengiriman data dari server ke robot disimulasikan dengan pengiriman balasan oleh server bahwa data sudah diterima. Selanjutnya robot akan merespon balasan dari server tersebut dengan menyalakan light emitting diode (LED) sebagai notifikasi. Hasil dari penelitian ini adalah sistem komunikasi data secara real time dengan menggunakan modul ESP8266 berhasil diimplementasikan dengan interval pengiriman data sebesar 33.29ms dan tingkat keberhasilan pengiriman data keseluruhan sebesar 100%.
Keyword: ESP8266, komunikasi data, real time

Judul: Rancang Bangun Wireless System menggunakan Modul NRF24L01+ untuk Komunikasi Saklar Jarak Jauh
Abstrak: Pertanian presisi meningkatkan efisiensi dan efektivitas dalam usaha memperbaiki produktivitas pertanian. Penerapan precision farming pada alat dan mesin pertanian membutuhkan navigasi yaitu RTK-DGPS (Real Time Kinematic- Differential Global Positioning System). Navigasi dengan RTK-DGPS cukup mahal. LPS (Local Positioning System) merupakan sistem navigasi lokal menggunakan transmitter cahaya laser dan receiver sensor cahaya serta menggunakan prinsip triangulasi untuk menentukan posisi dilahan. Penelitian ini difokuskan kepada rancang bangun wireless system menggunakan modul NRF24l01+ untuk komunikasi saklar jarak jauh. Metode yang digunakan diantaranya perumusan masalah, perancangan wireless system, perancangan pole, perancangan RTU (Rotating Transmitter Unit), uji fungsional, dan uji kinerja. Wireless system berfungsi dengan optimal pada transmisi rata-rata 2 Mbps dengan penambahan jeda pengiriman data. Komunikasi saklar belum bekerja dengan optimal, dimana pole dapat menerima trigger pada siang hari dengan jarak maksimal 20 meter. Pada malam hari komunikasi saklar bekerja namun belum maksimal. Dispersi data periode trigger meningkat seiring bertambahnya jarak RTU dan pole diakibatkan menurunnya intensitas cahaya laser dan posisi on/off cahaya laser yang dikontrol frekuensinya tidak stabil. Komunikasi saklar dapat terjadi dengan jarak terjauh 160 meter pada kecepatan putar RTU 300 rpm dan 120 meter dengan kecepatan putar RTU 600 rpm.
Keyword: komunikasi saklar, local positioning system, precision farming, wireless system

Judul: Study on dry fractionation behaviour and crystallization kinetics of coconut oil
Abstrak: Dry fractionation of oils consists of two stages, namely crystallization to produce solid crystals in a liquid matrices and filtration to separate the crystals formed from a liquid matrix. Changes that occur at the molecular level during the crystallisation process such as nucleation, crystall growth and changes in the phase behavior (folymorphism, solid-solutions). The overall changes at the molecular level is highly influenced by the treatment at the physical level in the form of heat removal. Methods of cooling (crystallization temperature, cooling rate and duration of the crystallization is applied) will largely determine the success of coconut oil fractionation process. This research aims to study the typical fractionation method for coconut oil at pilot plant scale (120 kg) and identify the conditions and essential requirements that must be managed and maintained in a dry fractionation stages of coconut oil; establish the crucial cooling systems in the dry fractionation of coconut oil as a guide in designing practical coconut oil fractionation; establish an effective cooling procedure to produce coconut oil fractions with a high content of MCT; determine the effect of cooling rate and crystallization temperature on the composition and profile of TAG, the kinetics of crystallization and melting properties of coconut oil fractionation products ; determine the relationship (model equations) between the parameters of fractionation with cooling procedure during the crystallization process, to predict the TAG composition, physical and thermal-mechanical properties of fractions produced. Coconut oil is dominant with lauric (C12:O), miristic (C14:0) and caprilic (C8:0)acid which composed the main trilaurin (LaLaLa), caprodilaurin (CaLaLa) and dilauromiristin (LaLaM) TAG. The content of lauric, miristic and caprilic acid in coconut oil are 51.73; 15.57 and 10.61%, respectively; while LaLaLa, CaLaLa and LaLaM TAG are 20.43; 16.23 and 15.38%, respectively. Coconut oil contains medium chain trigliserides (MCT) of 53.71%, trisaturated (St3) of 82.54%, disaturated (St2U) of 14:24%, monosaturated (StU2) of 3:22% and the proportion of high/low-melting TAG (S/L) by 49.25%. Coconut oil has a high SFC at low temperatures and a sharp decline to a temperature of 25 °C and then constant up to a temperature of about 30 ºC. Coconut oil’s SFC with about 32% was measured in temperature interval 21-22 °C, indicating that coconut oil has a good spreadibility at ambient temperature for countries that have 4 seasons. Coconut oil has SMP ranged between 24.5-26.2 °C, the water content of 0.021% and a free fatty acid content of 0.018%. Our study showed that there were three distinct cooling regimes critical to crystallization process, i.e. initial cooling, critical cooling and crystallization regime. Initial cooling was cooling from certain temperature that the oil has been rejuvenated and there was no more crystalized TAG (in this study rejuvenation was done at 70 oC for 10 minutes) to the onzet of oil crystallization temperature. For coconut oil the onzet of crystallization temperature was found at 29 oC. Critical cooling was cooling from the onzet of crystallization temperature (29 °C) to crystallization temperature. We predicted that during the critical cooling regime the crystal nucleation process was intensively occured (propagation). Crystallization regime was cooling to keep the oil temperature
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