This paper presents an automatic door lock as the classroom security system in the Electrical Engineering Department. This system use the ID Card (RFID) as the security key that connect to the server. ID Card as the input to trigger the microcontroller and send the data processing to the server. The server will give the instruction to the microcontroller as the input to the magnetic lock door. The aims of this study are to keep the security of the classroom based on arduino mega and verify the effectiveness of the classroom security door. The research method of this study are study of literature review, designing of the device and testing the system. The result show that the RFID card of classroom security door in Politeknik Negeri Sriwijaya based on arduino mega help the lectures improve the security, comfortability and the analysis descriptively found that the device can run effectively.
Pada penelitian ini dibahas mengenai kendali suhu air dengan sensor termokopel tipe-K pada simulator system pengisian botol otomatis. Pengontrolan ini ditujukan untuk menjaga agar botol yang digunakan tidak mengalami pemuaian akibat terisi oleh air dengan suhu tinggi. Dari peneltian didapatkan bahwa botol yang digunakan dalam system ini dapat bertahan atau tidak mengalami pemuaian jika diisi oleh air dengan suhu ± 65 o C. Suhu inilah yang kemudian dijadikan sebagai referensi dalam kendali suhu air oleh sensor termokopel. Kendali suhu ini dilakukan dengan cara memantau aktivitas heater agar tidak memanaskan air melebihi suhu setpoint yang ditentukan yaitu 60 o C. Pada proses kendalinya, sensor termokopel dibantu oleh PLC Schneider Modicon TM221M16R. Proses komunikasi antara sensor termokopel dan PLC memanfaatkan analog input yang tersedia diperangkat PLC. Adapun yang dibaca oleh PLC adalah tegangan yang dihasilkan oleh termokopel akibat perbedaan suhu antara hot junction dan cold junction. Tegangan yang dihasilkan oleh perbedaan kedua titik ini sangat kecil, berkisar antara 40µV/ o C. Oleh karena itu digunakanlah IC op amp LM 358 sebagai penguat tegangan. Keluaran dari LM 358 inilah yang dijadikan sebagai input analog PLC untuk mengontrol suhu air.
The electric vehicles (EVs) become very popular this day as an effect of the demand in order to reduce automobile emissions. The utilization of energy efficiency to preserve the global environment has been one of public concern. One of current interest is to provide the equipment related to efficient electric power and to reduce air pollution, especially CO2 emissions. Batteries have been the main energy source for a long time to EVs. Along with time, the technologies of different battery have been invented and adopted. The efficiency of battery is about how much power the battery can charge and discharge concerning battery capacity. The battery management system (BMS) has a crucial role in ensuring bout safety and performance of batteries. In general, there are two categories of batteries based on the ability of recharging, they are primary and secondary battery. The primary battery is type that can only be used once after being fully discharged. The secondary battery is type of battery that able to be recharged after discharging process. In EVs, it requires rechargeable battery with long cycle life, less of energy loss, high power density and sufficient safety level. Some types of batteries that used in EVs such as lithium-ion (Li-ion), lead acid, nickelcadmium (NiCd) and nickel-metal hydride (NiMH), etc. Li-ion battery becomes the most popular power supply implemented for Evs.
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