The design of a solar tracker with digital current and voltage measurements based on a microcontroller is a system that can follow the direction of the sun automatically based on the LDR sensor. The working principle of this tool is to direct the solar panels to follow the direction of the sun automatically and the current and voltage can be monitored digitally based on a data logger. The result of this design is that the solar tracker is programmed using Arduino Uno as the control center, LDR sensor for detecting sunlight as a determinant of the slope of the solar panel to the sun. To drive it, it uses two (2) power window motors which are controlled using the BTS7960 motor driver, and uses the INA219 sensor to measure the current and voltage. The output current and voltage of the solar panel is displayed on the LCD (Liquid Crystal Display) and can be monitored using the PLX-daq data logger.

Air is the most important factor in human life. Air quality is the most supportive factor in the development of everyday living things. Temperature, Humidity and PPM (Parts Per Million) substances in the air are the parameters most often found in the environment around where we live. Every day there is and increase in pollution from motorized vehicles without us knowing how bad or good the air condition in our environment is. Therefore we need and air quality monitoring to find out how good the air condition around us is by using the MQ-135 gas sensor which is produces air quality output and using the DHT11 sensor which is output the temperature and humidity of the air around the sensor. And using an ESP8266 microcontroller based to display the output on the sensor anywhere and anytime with internet. It is hoped that this tool can be useful to determine the condition of the room good or bad so that users can improve the condition of the room where they live. It is also hoped that this tool can detect gasses leaks that occur in closed room and provide a warning to the user’s cellphone.

The predictive torque control (PTC) technique of electric motor drive is based on the principle that the determined optimum voltage vector will be applied to the motor in the next cycle. If a three-phase inverter is used, this inverter can only realize eight different switching states. One of the eight switching states is used as the optimum inverter switching state for the next cycle. PTC with one-step prediction cannot obtain an experimental motor speed control, because in the real-time implementation, there is a single sampling delay between input and optimal actuation due to a large number of real time calculations. The delay time problem could be solved by modifying the optimization steps by using the two-step prediction of PTC model. The experimental results show that the motor can follow the reference speed and command torque in the step response and variable speed experiments. In variable speed experiment, good speed and torque dynamics can be achieved by selecting the proportional gain value that corresponds to the motor speed

Menganalisa keamanan layanan hosting merupakan hal penting untuk menjamin keamanan website. Penelitian ini dilakukanuntuk menguji tingkat keamanan website Desa. Dengan menggunakan 15 sampel dengan masing-masing 5 website, pada setiaplayanan Hosting seperti Wordpress, Blogspot, dan Shared Hosting. Dengan metode Black Box serta Google dork Untukmenemukan target website yang akan diuji. Open Web Application Security Project (OWASP) Zed Attack Proxy (ZAP) untukmenemukan celah keamanan dengan memindai website. Hasil yang didapat biasanya terdapat 3 jenis kerentanan yaitu Cross SiteScripting (XSS), Cross-Site Request Forgery (CSRF) Tokens, dan Clickjacking. Setelah itu, menganalisa hasil dengan caramelihat seberapa banyak peringatan yang didapat dari proses pemindaian untuk mengetahui layanan hosting manakah yangmempunyai tingkat keamanan yang paling tinggi.Peneltian ini bertujuan untuk membantu pemerintah Desa membangun website Desa yang aman. Dengan memilih layananhosting yang aman serta mengetahui cara menemukan celah keamanan pada website yang telah dibuat, sehingga dapatmemperbaiki celah keaman tersebut.Kata Kunci : Hosting, OWASP, ZAP, XSS, CSRF

Indonesia is a country that has two seasons, namely the summer and the rainy season, when the rainy season arrives, the rainfall will be very high which can cause flooding. This can be overcome by technological innovation in the form of tools that can work in real-time to detect the condition of water flow in rivers so that losses due to flooding can be minimized. This tool uses a level sensor with the float magnetic level gauge method which is connected to the ESP32 microcontroller module as a sensor data controller and sends the sensor measurement data values ​​to the IoT platform. The sensor measurement results correspond to the water level in centimeters and are sent to the IoT platforms, namely Blynk and Telegram in real-time. The results of sending data to the Blynk and Telegram applications have an average error value of 1.5%.

Effect of NaCl Immersion Media on Corrosion Rate on ST 42 Steel in Kepok Banana Peel Inhibitor Extraction. This study aims to determine the corrosion rate of ST 42 steel using an inhibitor of kepok banana peel extraction with various NaCl immersion media. Sample immersion time is 168, 336, 504 hours. The method used to calculate the corrosion rate is to measure the weight loss. The sample of this research was carried out in the Mechanical Engineering laboratory, Faculty of Engineering and the Pharmacy laboratory, Faculty of Mathematics and Natural Sciences, Tadulako University. The results obtained in the variation of NaCl 2.5%, 3.0%, 3.5%, 4.0%, 4.5%, inhibitor kepok banana peel extraction 300 ppm, an increase in corrosion rate with increasing NaCl variation with the same amount of extraction inhibitor, this is because the percentage of NaCl variation greatly affects the corrosion rate.

Utilization of electronic technology in various aspects of human life, both in household needs, education, industry, and human habitation itself. In this discussion is how to design a queuing system based on the Internet of Things using a Raspberry Pi W Zero controller. Internet of Things is a concept in which an object or object is implanted with technologies such as sensors and software with the aim of communicating, controlling, connecting, and exchanging data through other devices while still connected to the internet. In designing this queuing system, a website is needed to support this tool to make it easier for users to register online without having to manually take queue numbers. The programming language used for the Raspberry Pi W Zero controller uses python. Testing this queuing system 100% went well and according to what was designed for the design of an Internet of Things based anti covid 19 queuing system using the Raspberry Pi W Zero. With this tool, it can make it easier for users to register queue numbers and be able to run the appropriate Health protocol system.

The wind is one of the new renewable energy sources that can be used as a source of electrical energy. But the wind in nature has a speed that varies greatly with each time and place. This can be overcome by using the DC-DC Converter tool with a fuzzy method to produce a stable electrical voltage so that it becomes usable electrical energy. This tool uses a series of converters connected to the Arduino microcontroller. The DC-DC converter circuit in this study also uses a voltage sensor as feedback for the Fuzzy method to maintain the stability of the circuit output which varies from 2V-5V, so that it can maintain a voltage of 6.5V which is used as a 6V battery charging. This circuit has an average efficiency of 60% for the open-loop system and 63% for the closed-loop system.