No abstract

The local water supply corporation in Indonesia only uses analog water meter so that the monitoring of water usage information was conducted by officers manually. Officers must physically monitor the value in the customer's water meter that can lead to unreliable reading and ineffectiveness of process. Smart meter is one of the smart city metrics which could overcome this problem. This research uses the flow sensor to design and incorporate automated water meters. The measured value is then passed via the 433 MHz LoRa, a low-power wide-area network protocol, to the local hub, then forwarded to the server via the internet based cellular network. Results show that our proposed system's accuracy hit 97.31% at an ideal distance of 200 meters from customer to the local hub. The customer's water usage could be tracked in real time with our proposed system. Furthermore, the original water meter need not to be replaced which may minimize capital costs for this system.

No abstract

Penggunaan energi saat ini sedang menjadi sorotan pemerintah Indonesia. Salah satu kendalanya adalah penggunaan Penerangan Jalan Umum (PJU). Dengan membuat setiap penerangan jalan umum dapat berkomunikasi, pemerintah dapat memantau setiap penggunaan daya pada penerangan dengan menggunakan algoritma Leach, yang berfokus pada efisiensi daya dalam jaringan untuk menghemat penggunaan daya. Dalam algoritma Leach yang diusulkan, node akan mengirim data ke server melalui kepala cluster yang dipilih. Kemudian kepala cluster akan meneruskan data tersebut ke node master yang secara otomatis terhubung ke server. Dengan mengambil pendekatan seperti itu, penggunaan daya di setiap node akan efisien. Performa yang diperoleh dapat mencapai efisiensi 42% pada proses pengujian dibandingkan tanpa menggunakan algoritma Leach.

A laser rangefinder is a device that uses laser light to determine the distance of an object. The working principle of this laser rangefinder is that the laser beam that is emitted to the object will be reflected back to the rangefinder, and the required propagation time of laser beam will be calculated to get the distance value. In this study, a laser rangefinder system was designed to be used as monitoring of obstacle height between the line of sight of a microwave communication link using a quadcopter, which is used as a top-viewer picture taker. The quadcopter was used as a device to carry the laser rangefinder to measure the obstacle height between the location points of near-end and farend. The obstacle height reading results were transmitted using a 5.8 GHz wireless transceiver to the monitoring location in real time. The data received were then processed to be displayed in the form of obstacle height graph as a function of the line of sight communication distance. The test results show that the implementation of laser rangefinder technology has an accuracy of more than 90%.