Nowadays, internet connectivity is one of the staple things in human lifestyle, especially for those who live in cities. There are a lot of ways to connect to the internet, and one of them is using Wi-Fi (Wireless Fidelity) connection. Wi-Fi connection is seen as the most reliable connection, until Li-Fi (Light Fidelity) technology is coined in 2011. Li-Fi uses visible light as data transfer medium instead of radio frequency (RF) signal used by Wi-Fi. Theoretically, Li-Fi is able to reach hundred times of Wi-Fi connection speed due to their use of light as data transfer medium. Li-Fi is also expected as a solution to environmental problems caused by Wi-Fi. The RF signal used by Wi-Fi can cause some environmental problems such as growth inhibition and diseases to organisms including humans. The visible light used by Li-Fi is expected to cause minimal effects to the environment, as Li-Fi uses common LED light bulbs which are used as home lighting apparatus.  Li-Fi is commonly seen as a ‘greener’ technology compared to Wi-Fi. In this review, the performance and environmental impacts of both Wi-Fi and Li-Fi are analysed to determine whether Li-Fi is really capable to be a ‘greener’ replacement to Wi-Fi technology

No abstract

ABSTRAKMeningkatnya jumlah sampah botol plastik sekarang ini telah membawa banyak masalah kesehatan dan lingkungan hidup. Masalah tersebut dapat dikurangi jika seseorang mau membawa botol minum (tumbler) sendiri. Namun, dibutuhkan mesin penjual air mineral untuk mengisi ulang tumbler. Paper ini menjelaskan disain dan implementasi prototipe mesin penjual air mineral otomatis, praktis, dan ekonomis berbasis Arduino Mega 2560 dan RFID-RC522. Pengujian terhadap prototipe ini dilakukan dalam tiga tahap: (1) pengujian jarak baca antara kartu RFID dengan RFID reader, (2) pengujian pada kondisi ideal, dan (3) pengujian pada kondisi tidak ideal. Dari pengujian pertama disimpulkan bahwa RFID-RC522 dapat melakukan pembacaan optimal pada jarak 35 mm. Dari hasil pengujian kedua diperoleh nilai akurasi (keakuratan) pada saat pengisian air sebesar 82%. Sedangkan hasil pengujian ketiga menyatakan bahwa prototipe dapat membaca kemungkinan yang terjadi pada kondisi tidak ideal. Kelemahan dari prototipe ini adalah belum terintegrasi dengan sistem pembayaran uang elektronik (e-money).Kata kunci: Arduino Mega 2560, Mikrokontroller, RFID-RC522, Sampah Plastik. ABSTRACTThe increasing amount of plastic bottle waste today has brought many health and environmental problems. These problem can be minimized when someone brings their own drinking bottle water. But, vending machine-like was needed to refill the tumbler. This paper explains a design implementation of prototype that can provide an automatic, practical, and economical mineral water filling based on Arduino Mega 2560 and RFID-RC522. Testing on this prototype was carried out in three stages: (1) testing of the reading distance between the RFID card and the RFID reader, (2) testing under ideal conditions, and (3) testing under non-ideal conditions. From the first test summarized that the RFID-RC522 can perform optimal readings at a distance of 35 mm. From the second test obtained the accuracy of the prototype when filling water by 82%. And the third test shows that the prototype could read the possibilities occurred in non-ideal conditions. The drawback of this prototype is not yet integrated with e-money payment system.Keywords: Arduino Mega 2560, Microcontroller, RFID-RC522, Plastic Waste.

This paper concentrates of creating a fault detection system that detect both emergency fault and fault that need of maintenance with prototype of electrical installation that is done through manual simulation method. The prototype consists of the lamp as the load integrated with Arduino UNO as the microcontroller with GSM module and buzzer. The microcontroller will detect and deduce the type of the fault happened in the installation and will send the data of the fault through the GSM module. GSM module then transmits the data to the mobile phone and let the user aware of the fault. Also, there will be buzzer as the warning system by producing high pitch sound that signalizes the fault that need immediate handling or emergency. The data of both faults will be sent as Short Message Service (SMS) to the user. The SMS will give the user the type of fault either emergency or need of maintenance, happened in the installation.

Smartphone technology can be applied not only to establish communication needs but also to support other purposes. One of them is related to personal safety and security functions. It is undeniable that criminal acts can occur anytime and anywhere. Even in a private or residential area, theft could happen. Smartphone and sensor technology can be used as a solution to encounter this problem. In this case, it can be utilized to improve the security control system of the gate or garage door at home. This research presents a prototype of a gate and garage door control and security system that operates through an application on an android smartphone. The application of HC-05 Bluetooth is used to send signals from the smartphone to the Arduino Uno microcontroller, while the micro servo acts as a locking mechanism on the gate itself. The buzzer function is presented to notify homeowners when the gate or garage door is open for more than 15 seconds. This prototype can control gates and garage doors with an average connection time of only about 5 seconds. Thus, this prototype is feasible to use as an alternative to control and improve housing security systems.