Abstract—A water management system is being developed in Politeknik Negeri Samarinda (Polnes). The system consists of a number of sensor node (SN) that is always connected to a gateway/sink. Communication network between SNs and gateway is considered to utilize radio technology. As the campus area reaches 10 hectare, long range (LoRa) radio technology might be the candidate. Eventhough LoRa, in its specification, could cover the distance of around 15 km in line of sight condition, Polnes campus that has hilly terrain with several storey buildings may reduce the coverage of LoRa. Hence, in this research, the received signal strength (RSSI) was measured to find the possibility of LoRa being the communication network infrastructure. At the location where the gateway would be installed, a 433 Mhz LoRa transmitter was operated to continuously send data packets. A LoRa receiver was brought to every future SN locations to measure the RSSI. The measurement by the receiver that was equipped with a rubber duck antenna (3 dBi gain) showed that the RSSI is between -107 dB to -85 dB for the distance of up to 165 meter. Meanwhile, by the use of a Yagi antenna with the gain of 7.37 dBi, the RSSI value is between -100 dB to -80 dB. All of those results verify that LoRa is capable for the communication infrastructure of Polnes water management system.
Abstrak- Peralatan yang umum digunakan untuk pengujian kinerja sel fotovoltaik adalah simulator surya. Rancang bangun modul simulator surya ini berguna sebagai media pembelajaran. Simulator surya ini digunakan sebagai perangkat untuk menggantikan matahari sebagai sumber cahaya alami untuk penyinaran fotovoltaik dengan kondisi laboratorium. Pada perancangan ini dibangun sebuah sistem simulator surya berbasis lampu LED dengan pengendali Arduino. Dengan LED yang digunakan berjenis LED daya tinggi dengan beberapa jenis warna LED, memungkinkan intensitas yang dihasilkan lebih besar dibanding LED indikator dan untuk membandingkan pengaruh setiap spektrum warna terhadap daya keluaran dari fotovoltaik. Berdasarkan hasil pengujian modul simulator surya untuk penggunaan fotovoltaik ini, daya yang dihasilkan terhadap modul fotovoltaik 10 WP pada penyinaran maksimal LED yaitu tegangan rangkaian terbuka dapat mencapai 18 V dan arus hubung singkat adalah 42 mA.
PLC merupakan salah satu alat kendali yang dirancang untuk mengendalikan dan mengatur jalannya suatu proses industri secara otomatis. Salah satu bahasa yang umum dipakai untuk memrogram PLC adalah ladder logic. Untuk dapat melakukan pemrograman dengan baik, diperlukan waktu yang cukup untuk mempelajari dengan cara mencoba langsung di sistem alat. Tetapi harga perangkat PLC industrial cukup mahal, sehingga menyulitkan mahasiswa untuk dapat dengan leluasa mempelajarinya. Dengan demikian diperlukan suatu cara agar mahasiswa dapat berlatih secara intensif tanpa terkendala faktor biaya yang mahal. Salah satu upaya adalah dengan mencoba memanfaatkan sistem Arduino Nano dan Arduino Mega yang dapat diprogram dengan ladder logic melalui perangkat lunak Outseal Studio dan LDmicro. Dalam makalah ini disampaikan bagaimana sistem Arduino yang lebih murah dapat dimanfaatkan untuk mempelajari ladder logic. Pengujian dilakukan dengan simulasi dasar sistem praktikum airblast, milling, pompa air dan ATS, dengan hasil sistem bekerja sesuai dengan deskripsi dan program yang diterapkan. Alat yang dihasilkan ini dapat menjadi alternatif untuk pembelajaran mahasiswa.
Silicon Controlled Rectifier (SCR) is one of the components studied in the Power Electronics course at the Department of Electrical Engineering, Samarinda State Polytechnic. Therefore, in the SCR learning process, a practicum module is needed as a learning support tool. The practicum modules in the Power Electronics laboratory are prone to damage and are difficult to repair, so updating tools with simpler maintenance and operation needs to be done. In the module that has been designed, the operation of the SCR is carried out by detecting the zero crossing point on the sinusoidal waveform of the source voltage. Detection is carried out by the zero cross detector module which then sends pulses to the Arduino Mega. The pulse will be used by Arduino Mega to send a trigger pulse signal to the SCR gate leg. The delay time of the trigger pulse is set by the program in the Arduino to get the desired triggering angle. In the test, the SCR module was operated as a single-phase half-wave controlled rectifier, a single-phase full-wave controlled rectifier with a center-tap transformer, a bridge system single-phase full- wave controlled rectifier, and a three-phase half-wave controlled rectifier. As a result, the triggering angle is inversely proportional to the value of the output voltage and current parameters. As the value of the trigger angle is increased, the value of the output voltage and current of the controlled rectifier will decrease.
Experience shows that teaching Power Electronics subjects is not easy, even to undergraduate students. This phenomenon might stem from the fact that Power Electronics is an engineering discipline that closely related to other disciplines. Some experts stipulate that Power Electronics is a multidisciplinary subject while for some other it is an interdisciplinary subject. In students point of view, it does not matter what side Power Electronics reside, they always see it as a difficult subject. Most of the time engineering technology (TVET) student might consider this subject more as a burden. This does not come as a surprise; sampled Indonesian students score lower in PISA (Programme for International Student Assessment), a periodic student testing conducted by OECD (Economic Co-operation and Development). The score outline the lack of HOTS (Higher Order Thinking Skills) from many Indonesian students. The inadequacy in that skills hampers the future development of many students, especially in a subject such as Power Electronics that require some degree of mathematical prowess and deeper thinking. It gets worse with the influence of technology on student attention span, and they cannot focus on a more extended period as their predecessor was. This kind of deficiency threat the very survival of the nation as we enter The Industrial Revolution 4.0 where many current human jobs will be replaced by network connected automation. We need to address this problem adequately. The massive national interest in robotics may be one of the answers to this problem. However, due to the expensiveness of this solution, it needs to be adapted to the available budget. The literature study that used as a foundation of ongoing effort to incorporate a simple robotic experiment in Power Electronics teaching is presented. The study then followed by a discussion about the current state of the effort.
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