1 arifhernowo@student.gunadarma.ac.id, 2 setiyono@staff.gunadarma.ac.id, 3 sandy_sr@staff.gunadarma.ac.id, Abstrak Banjir merupakan permasalahan yang terjadi akibat dari volume air yang berlebih pada sungai yang dipengaruhi oleh aktifitas manusia yang tidak ramah terhadap lingkungan. Banjir memiliki dampak negatif yang cukup banyak salah satunya adalah rusaknya sarana dan prasarana masyarakat. Kesiagaan masyarakat cukup penting diperlukan untuk mengurangi dampak negatif dari banjir tersebut. Salah satu solusi yang dapat dilakukan adalah dengan merancang suatu sistem simulasi peringatan dini banjir sebagai alat dalam mendetaksi ketinggian air sebelum terjadi datangnya bahaya banjir. Penelitian ini bertujuan untuk membuat prototipe sistem peringatan dini bencana banjir yang mudah dioperasikan dan efektif untuk mendeteksi datangnya banjir. Pada protipe terdapat sensor level switch yang mampu mendeteksi pergerakan tinggi permukaan air pada daerah aliran sungai. Data hasil pengukuran tersebut akan diolah menggunakan PLC Omron sebagai pusat pengolahan data. Hasil olah data selanjutnya dikirim ke Arduino Uno untuk mengirim pesan kepada pengguna menggunakan modul GSM SIM800L V.2. Jika permukaan air mencapai ketinggian yang telah ditentukan, maka alarm buzzer berbunyi dan lampu LED menyala. Hasil pengujian menunjukkan bahwa respon sensor banjir dengan alarm peringatan sangat cepat yaitu kurang dari 3 detik. Waktu pesan SMS hingga sampai pada ponsel penerima relatif cepat yaitu dibawah 15 detik. Kata Kunci: Arduino uno, banjir, GSM SIM 800L, PLC Omron, sensor level switch, sistem peringatan diniAbstract Flooding is a problem that occurs as a result of excess water volume in the river which is influenced by human activities that are not friendly to the environment. Floods have quite a number of negative impacts, one of which is the destruction of community facilities and infrastructure. Community preparedness is important enough to reduce the negative impact of the flood. One solution that can be done is to design a flood early warning simulation system as a tool in detecting water levels before flood danger occurs. This study aims to make a prototype of a flood early warning system that is easy to operate and effective for detecting floods. In the prototype there is a level switch sensor that is able to detect movement of water level in the watershed. The measurement data will be processed using Omron PLC as a data processing center. The results of data processing are then sent to Arduino Uno to send messages to users using the GSM SIM800L V.2 module. If the water level reaches a predetermined height, the buzzer alarm sounds and the LED lights up. The test results show that the response of flood sensors with a very fast warning alarm is less than 3 seconds. The time of the SMS message to arrive at the recipient's cellphone is relatively fast, namely under 15 seconds.
This paper presents how to harmonic disturbance reduce on single phase power system. One of the most popular method is harmonic signal extraction with instantaneous power p q theorm. This algorithm implemented to harmonic cencellation by active power filter circuit be paralled with the non linier load. This filter generates of current compensation that are injected into the grid to improve power quality. This Filter is built by an inverter circuit that consists of a mosfet switch array and capasitor mounted on DC link side. Two types of loads are resitive inductive and resistive capasitive produce of current source wave form that close pure sinusoid. Simulation results show the THD index fell to the level of 2.7% in accordance with IEEE 519 standard rules which states that the harmonics content of the power system may occur below 4%, indicating that the power system can be categorized as having good quality.
The recording of the amount of electrical energy consumed by the public on postpaid electricity customers often experiences reading errors by officers. The contributing factor is the absence of occupants of the house when recording the amount of power used by the officer so that the officer records the use of electrical power based on the average previous use. Therefore, to find out the amount of electrical energy that is being used, a periodic electrical energy monitoring system is needed. This device is designed to support monitoring the use of electrical energy in household consumers. Arduino uno as a microcontroller based atmega28, current sensor and voltage sensor are supporting devices used as a monitoring system for the use of electrical energy that can provide information on electrical parameters such as voltage, current, power values, using the blynk application by utilizing the development of Internet of Think technology. IoT) so that the use of electrical power can be seen anytime and anywhere via the internet network. This tool has an average reading error value of 13.68% for current and 14.06% for power. Based on these data, this system is very suitable to be used as a monitoring of electric power consumption because the error generated is quite small.
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