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This study presents an innovation design for an Internet of Things (IoT)-based watering and liquid fertilizer control system for chili plants using a NodeMCU ESP32. The main problem addressed is the manual watering and fertilizing process, which makes it difficult for farmers to monitor soil moisture, temperature, air humidity, and light intensity in real time. The recommended method used in this draft is Research and Development (R&D) with a prototyping approach because the study focuses on designing, building, integrating, and testing an IoT device through iterative stages. The system is designed using a soil moisture sensor, DHT11, LDR sensor, two-channel relay, two 12 V DC pumps, 16x2 I2C LCD, and the Blynk Mobile application for remote monitoring and control. Sensor data are transmitted to Blynk as percentage values and plant condition statuses, while the water and fertilizer pumps can be controlled using virtual buttons. The control logic defines the optimal condition for chili plants based on soil moisture of 60-80%, temperature of 25-30°C, air humidity of 60-80%, and light intensity of 50-90%. Prototype documentation and functional testing data will be completed in the next stage.

Kesadaran dan kepedulian masyarakat terhadap lingkungan telah mendorong munculnya berbagai inisiatif pengelolaan sampah berbasis komunitas, salah satunya melalui mekanisme bank sampah. Namun pada praktiknya, banyak bank sampah masih mengandalkan pencatatan manual yang berpotensi menimbulkan kesalahan pencatatan, duplikasi data, keterlambatan pelaporan, dan kesulitan pelacakan transaksi. Penelitian ini bertujuan untuk mengembangkan sistem digital pengelolaan bank sampah berbasis mobile android dengan memanfaatkan Low-Code Development Platform (LCDP) sebagai pendekatan pengembangan yang efisien dan ekonomis. Hal ini sejalan dengan harapan pengelola bank sampah terkait penghematan biaya pengembangan, operasional, dan biaya perawatan sistem. Metode Prototyping digunakan sebagai model pengembangan sistem, dimana proses iterasi dilakukan berdasarkan umpan balik pengguna hingga sistem sesuai dengan kebutuhan operasional. Selama fase konstruksi, purwarupa yang dibangun mengalami dua tahap penyempurnaan sebagai hasil evaluasi pengguna terhadap perluasan fitur dan peningkatan fungsionalitas sistem. Evaluasi sistem dilakukan dengan menguji fungsionalitas setiap fitur menggunakan metode uji blackbox, melibatkan dua responden dengan perangkat yang berbeda. Hasil pengujian menunjukkan konsistensi hasil uji untuk setiap responden, seluruh fungsi sistem, termasuk pencatatan transaksi penukaran barang dan penarikan saldo, pengelolaan data peserta, autentikasi pengguna, serta pembatasan hak akses berjalan sesuai dengan perencanaan tanpa ditemui kendala fungsional. Pemanfaatan LCDP dengan metode prototyping memberikan kemudahan dan mempercepat proses pengembangan sistem serta memberikan fleksibilitas adaptasi dalam merespons perubahan maupun penambahan kebutuhan fungsionalitas sistem.

This study aims to analyze fifth-grade students’ understanding of the water cycle concept at SD Muhammadiyah Sidayu using animated video assistance, as well as to describe supporting and inhibiting factors, identify obstacles faced by teachers and students, explain teachers’ efforts, and examine students’ responses in science learning. The research used a descriptive qualitative method with 23 fifth-grade students as participants. Data were collected through tests, questionnaires, interviews, and observations, and analyzed using data reduction, data presentation, and conclusion drawing. Data validity was ensured through triangulation of technique, source, and time. The results indicate that students’ understanding of the water cycle concept is categorized as moderate, with an average score of 69.43. Students are able to explain the definition and stages of the water cycle through images, classify events based on similarities in processes, and distinguish between evaporation and condensation. However, they still face difficulties in explaining the relationships between processes and in providing real-life examples related to the water cycle. Supporting factors include students’ interest and learning motivation, while inhibiting factors involve differences in comprehension abilities and students’ health conditions. Teachers face obstacles such as limited audio-visual facilities, shared LCD usage, and challenges in selecting appropriate animated videos. To overcome these issues, teachers use simple explanations, emphasize key points, replay videos, provide individual guidance, and assign diagram-based projects. Students’ responses are very positive, as animated videos increase their interest, attention, motivation, and conceptual understanding.

This research aims to design and develop a simple Dino-themed game based on a microcontroller, with the display using an I2C LCD. The game is inspired by the offline Dino game on Google Chrome, adapted to run on an Arduino Uno microcontroller. The research method used is Research and Development (R&D), consisting of stages such as needs analysis, system design, simulation using Wokwi, hardware assembly, programming, and testing. The system uses push buttons as input and a 16x2 I2C LCD as the output display. The testing results show that the system can respond quickly to user input and display character movement and score updates dynamically on the LCD screen. Although the graphical capability of the LCD is limited, the game runs well and successfully demonstrates the basic concepts of microcontroller programming as well as interactive input-output processing. Further development is recommended to enhance the graphical interface and add features such as sound effects and progressive difficulty levels.

Adanya risiko pencemaran lingkungan dan ledakan yang disebabkan oleh tekanan balik pada aliran gasbuang sehingga diperlukan pembuatan sistem pengapian (ignitor) otomatis dimana gas buang dapatterbakar sebelum dilepaskan ke lingkungan. Perangkat ini menggunakan modul MAX6675, sensortermokopel tipe-K, mikrokontroler ESP32, aktuator ignitor elektrik, tampilan LCD I2C, dan platformBlynk untuk monitoring jarak jauh. Pipa Ignitor yang berfungsi untuk menghasilkan api kecil suhunyaakan dideteksi oleh sensor termokopel, dimana besar kecilnya temperatur akan diberikan oleh termokopelmelalui modul MAX6675 kepada mikrokontroller, lalu diolah oleh mkrokontroller. Hasil dari pengolahanmikrokontroller akan diberikan kepada ignitor untuk memerintahkan apakah ignitor On atau Ignitor Off.Suhu dan status ignitor ditampilkan melalui LCD dan Blynk pada monitoring jarak jauhnya. Rentang suhuuji 0°C-100°C, pengujian mengukur waktu respons ignitor, akurasi suhu, dan efektivitas pembakaran.Hasil penelitian menunjukkan bahwa sensor sangat akurat (selisih <1%), sistem dapat mengaktifkanignitor secara Otomatis (SUHU1 untuk pembacaan sensor) sesuai ambang suhu yang ditetapkan (ignitorON di bawah 100 °C dan OFF di atas 100 °C), Serta terdapat sistem Manual (SUHU2) yang dapat disebutjuga sistem bypass yang mengaktifkan ignitor hanya dengan mengaktifkan tombol FIRE. Jarak antara busidan elektroda pemantik ssebesar 50 mm merupakan jarak untuk mendapatkan nyala api terbaik. Sistemotomatis maupun manual dari ignitor ini dapat dimonitor melalui LCD, Blynk dan pembacaan faultnyadapat bekerja sesuai dengan perancangan.

This study aims to design, implement, and test a prototype that automates three functions, namely watering, fertilizing, and pest control based on Arduino Uno with the ability to directly monitor soil moisture and pH. This system is equipped with four main types of sensors. Soil condition monitoring involves an FC-28 soil moisture sensor and a soil pH sensor, water level measurement involves an HC-SR04 ultrasonic sensor, and pest detection in the plant area involves a RIP sensor. All data obtained from these sensors is then processed by the Arduino Uno microcontroller to automatically activate actuators such as water pumps, liquid fertilizer pumps, buzzers, and DC motors according to soil conditions and plant needs. Prototype testing was conducted on simulated land with various scenarios of moisture, soil pH, and pest activity. The test results revealed that the system was proven to be able to significantly optimize water and fertilizer utilization, as well as reduce pest disturbances that could potentially damage plants.  In addition, this system also displays the operational status directly through an LCD screen, making it easy for users to monitor. The advantage of this system is its multi-function integration in a single device that is cost-effective and easy to operate. In the future, the functionality of this system can be improved through integration with Internet of Things (IoT) technology, enabling remote monitoring and control with greater efficiency. More broadly, this study is expected to support increased production and sustainable agricultural practices in Indonesia.

The use of technology in elementary school learning plays a crucial role in improving the quality of the educational process. One frequently used tool is the infocus (LCD projector), which serves to present learning materials in visual and audiovisual forms. The purpose of this study was to assess the effectiveness of using infocus-based learning media in elementary schools and its impact on student learning. The method used was a qualitative approach, collecting data through observation, interviews, and documentation. The results showed that the use of infocus can improve students' concentration, motivation, and understanding of the subject matter, as the presentation becomes more engaging and easier to understand. However, the use of infocus in elementary schools still faces various challenges, such as limited facilities and infrastructure, teacher readiness to operate the equipment, and technical problems such as power problems and additional devices. Therefore, supporting facilities and improving teacher skills are needed to ensure the effective and sustainable use of infocus as a learning medium.

The increasing proportion of the elderly population in Indonesia has led to a rise in degenerative health problems, one of which is osteoporosis. Osteoporosis is a bone disease characterized by decreased bone density, increasing the risk of fractures, particularly among elderly women. Low calcium intake, lack of physical activity, and limited knowledge regarding osteoporosis prevention are major contributing factors. This community service activity aimed to improve the knowledge of Aisyiyah women in Cirebon Regency regarding osteoporosis in the elderly, including its definition, risk factors, impacts, and prevention strategies through proper nutrition and regular physical activity. The activity was conducted from October to December at the Aisyiyah Study Hall in Cirebon Regency, targeting pre-elderly and elderly women. The methods used included health education through lectures and interactive question-and-answer sessions, supported by laptops, LCD projectors, and PowerPoint presentations. Evaluation of participants’ knowledge was carried out using oral pre-tests and post-tests related to the delivered material. The results indicated an improvement in participants’ understanding of osteoporosis, the importance of adequate calcium intake, and the role of physical activity in maintaining bone health. This community service program is expected to contribute to increasing health awareness and reducing the risk and prevalence of osteoporosis among the elderly.

Schools serve as environments where children receive a formal education. In addition to serving as educational institutions, schools can also pose a risk for spreading diseases. Diarrhea accounts for up to 65% of deaths, while other illnesses contribute to 26%. Healthy and clean living practices involve initiatives to offer learning experiences or establish environments for individuals, families, groups, and communities by facilitating communication, sharing information, and arranging educational opportunities to enhance knowledge, attitudes, and actions. This community service seeks to impart knowledge and awareness of clean and healthy living habits to Sekolah Dsar children, enabling them to incorporate these practices into their everyday lives. This community service is conducted through counseling delivered via lectures, interactive discussions, and simulations utilizing LCD media and instructional materials. The event was successful, and everyone involved was excited about this service project.

Suhu dan kelembaban merupakan parameter lingkungan yang harus dijaga pada ruang kubikel untuk memastikan peralatan distribusi listrik tetap bekerja secara optimal. Pada multi-kubikel, perbedaan fungsi dan beban menyebabkan karakteristik suhu dan kelembaban pada tiap ruang kubikel tidak sama, sehingga pemantauan secara manual menjadi kurang efektif dan efisien. Penelitian ini bertujuan untuk merancang dan membangun prototype sistem monitoring dan kontrol suhu-kelembaban pada multi-kubikel berbasis Internet of Things (IoT) yang terdiri dari tiga buah kubikel. Sistem ini menggunakan ESP8266 sebagai mikrokontroler utama dan sensor DHT20 sebagai sensor suhu dan kelembaban yang masing-masing dipasang pada kubikel dengan kondisi lingkungan berbeda. Sistem dilengkapi dengan aktuator kipas dan lampu, serta notifikasi real-time melalui LCD dan Telegram. Meskipun kontrol dan monitoring dilakukan secara terpisah pada tiap kubikel, notifikasi kondisi seluruh kubikel terintegrasi pada satu kanal Telegram yang sama. Pengujian kinerja sistem dengan memberikan variasi suhu dan kelembaban yang berbeda untuk tiap kubikel. Kubikel 1 diberi kondisi normal (suhu 35°C-40°C dan kelembaban 50%-70%), kubikel 2 diberi kondisi overheat (suhu di atas 40°C), sedangkan kubikel 3 diberi kondisi overhumidity (kelembaban > 70%). Hasil pengujian menunjukkan sistem mampu melakukan kontrol suhu dan kelembaban dalam ruang multi-kubikel serta mengirimkan notifikasi melalui Telegram dengan tingkat keberhasilan 100% dan rata-rata delay 5,6 detik.

The main problem with the water heating system on offshore platforms is the absence of water level monitoring and automatic overflow detection. This has the potential to cause hot water spills that endanger workplace safety and operational efficiency. This research designs and implements a water level monitoring system based on the Arduino Uno microcontroller with HC-SR04 ultrasonic sensors. The system is equipped with LED indicators, a buzzer alarm, and a 16x2 LCD to display water level status in real-time. Water levels are classified into three zones (low, medium, high), and overflow is detected if the water is within 3 cm of the sensor. Testing was conducted on a 5-liter simulation tank representing actual 500-liter tank conditions. Test results showed a reading accuracy of 96% and a quick system response to overflow conditions (<1 second). This system is economical, easy to develop, and highly applicable for offshore environments. In addition, this system can be integrated with IoT technology for remote monitoring.

Abstract Kebakaran merupakan salah satu bencana yang dapat mengancam keselamatan jiwa dan harta benda, khususnya di lingkungan hunian padat seperti rumah kos. Kos Putri Kanaya Projo merupakan salah satu kos putri di Ungaran Timur, Kabupaten Semarang, yang berisiko tinggi mengalami kebakaran akibat kelalaian penghuni dalam penggunaan peralatan listrik maupun kompor gas. Penelitian ini bertujuan untuk merancang dan membangun sistem pendeteksi kebakaran dini berbasis mikrokontroler dengan dukungan teknologi Internet of Things (IoT).  Sistem dikembangkan menggunakan mikrokontroler ESP32 yang terhubung dengan sensor MQ-2 (asap/gas), sensor PIR (api), dan sensor DHT22 (suhu/kelembapan). Output sistem berupa notifikasi peringatan pada aplikasi Blynk, buzzer sebagai alarm suara, serta tampilan informasi melalui LCD. Metode penelitian yang digunakan adalah prototyping dengan tahapan perancangan, implementasi, pengujian, serta penyempurnaan sistem. Hasil pengujian menunjukkan bahwa sistem mampu mendeteksi asap, gas, suhu tinggi, dan api dengan akurasi di atas 90% serta memberikan notifikasi peringatan melalui aplikasi Blynk dengan waktu respon kurang dari 10 detik. Dengan demikian, sistem ini efektif sebagai solusi deteksi dini kebakaran pada lingkungan kos sehingga dapat meningkatkan keamanan dan meminimalisir risiko kerugian material maupun korban jiwa

The distinctive markings on the fingers are known as biometrics. The fingerprint attendance method uses biometrics. Without developing a usable fingerprint tool, research on fingerprint attendance is restricted to processing attendance data. As a result, an Arduino-based fingerprint approach was used to construct an attendance tool. The education sector is where SMK Negeri 1 Indralaya Utara. The school's student attendance system is still operated manually. In this study, the system uses fingerprints and camera recording to track students' locations. Using an Arduino Mega as a microcontroller, this tool will display student attendance information on an LCD, save it on an SD card module, and send the ESP32CAM-generated photographs over Telegram. The literature review is the first step in the research process, followed by hardware and software design. Following completion, the tool is put through testing to evaluate its functionality. Each of the ten participants scanned their thumb and index finger. The thumb and index finger have an average of five tests, with a 0.28% mistake rate, depending on the number of trials. Each component's error percentage is less than 1% while still falling within the 5% tolerance limit. The image test results indicate two conditions: 20 cm and greater. The ESP32CAM will activate when we take a picture at a distance of 20 cm.

The braking system was a crucial component in ensuring the safety of motor vehicles on the road. Brake failures, such as brake fade or total malfunction, could result in fatal accidents. Therefore, an accurate and realistic testing method was necessary to measure the effectiveness of a vehicle’s braking system. This study aimed to develop a deceleration measuring device based on GPS, which could be used in road test methods. The device was designed using an ESP32 microcontroller combined with a BN-220 GPS module, RTC real-time clock sensor, 16x2 LCD, thermal printer, and microSD storage media. Testing was conducted on a Mitsubishi L300 vehicle at the Depok Beach runway in Yogyakarta, with initial speed variations ranging from 10 to 80 km/h. Calibration results showed that the device had an accuracy of 99.64% with an average error of 0.36%. Meanwhile, the test results recorded deceleration values ranging from 0.74 to 3.26 m/s², depending on the initial speed and braking conditions. Based on these findings, the developed device proved to be accurate and feasible as an alternative method for field testing of braking systems.

The development of information technology (IT) has made a significant contribution to the field of education, including at the junior high school level. This study aims to examine the implementation of information technology in the learning process of seventh-grade students at SMP Katolik St. Aloysius. The research method applied was descriptive qualitative, employing observation, teacher interviews, and student questionnaires. The findings indicate that the use of IT tools such as computers, LCD projectors, and online learning applications, particularly Google Classroom and WhatsApp Groups, has enhanced student learning motivation, facilitated easier access to learning materials, and strengthened interaction between teachers and students. Moreover, technology integration enables teachers to deliver more engaging and varied learning experiences, encouraging students to participate more actively in the classroom. Nevertheless, several challenges were identified, including limited school infrastructure, varying levels of digital literacy among students, and unequal internet access. These obstacles may hinder the effectiveness of IT implementation in the learning process. Therefore, continuous mentoring strategies, infrastructure improvement, and digital literacy training for both students and teachers are necessary. In conclusion, the implementation of information technology at SMP Katolik St. Aloysius has had a significant positive impact on the learning process but requires sustainable support and improvements to achieve optimal outcomes

Infusion Device Analyzer is a tool for testing the performance of an infusion pump and Syringe Pump. This tool measures flow and occlusion provided by the infusion pump and syringe pump. So a tool is needed to calibrate the infusion pump and syringe pump according to applicable standards so that swelling does not occur in the patient. The design of this calibration tool can also be used as student learning material so that students can understand and comprehend the working principles of the Infusion Device Analyzer. This tool is made using the Arduino Uno control system and there is an occlusion and flow measurement display along with room temperature and humidity which will be displayed on the Nextiton 4'3 Inch LCD. Accompanied by an optocoupler sensor as a liquid flow detector and an MPX5700AP sensor as a liquid pressure detector which is equipped with a DHT22 sensor as a room temperature and humidity meter. This calibrator tool is also equipped with a solenoid valve to regulate the entry of fluid to be measured between flow or occlusion measurements. The function test results show that the flowrate measurement of 10 is 12ml/h, 50 is 54ml/h, 100 is 105ml/h while the occlusion with a rate of 100 is 2.66 psi and the tolerance value for the parameters is appropriate. Therefore, the tool created is close to the desired plan and can be used as a suitable comparison of whether a Syringe Pump or Infusion Pump tool is suitable after repairs or during maintenance. This tool can also be used in learning for students to understand the parts of the working principle of this tool.

An electrostimulator is a medical device designed to deliver controlled electrical stimulation to nerves and muscles, supporting rehabilitation and therapy for patients with neuromuscular disorders. This study focuses on designing and developing a portable electrostimulator that offers three distinct waveform modes: continuous wave, discontinuous wave, and dense-disperse wave, providing versatility for different therapeutic needs. The device is powered and controlled by an Arduino Mega 2560 microcontroller, coupled with a Nextion touchscreen LCD interface that allows users to adjust waveform type, frequency, and stimulation intensity with ease. Waveforms are generated through an NE555 IC circuit, with amplitude adjusted via a potentiometer and subsequently amplified using a step-up transformer to achieve therapeutic voltage levels. Functionality and performance tests were conducted using an oscilloscope, and the device was benchmarked against a commercial KWD-808 electrostimulator. Results demonstrate that the developed electrostimulator reliably produces the intended waveforms, achieving peak voltages up to 32V and frequencies ranging from 33.3 Hz to 66.6 Hz, confirming its effectiveness and feasibility for non-clinical nerve and muscle therapy applications.

Blood transfusion is a critical medical procedure that requires the blood to be at a temperature close to normal human body temperature, approximately 36– 38°C. Transfusing cold blood can lead to serious complications such as hypothermia, coagulation disorders, and even cardiac arrest. Therefore, a reliable and automated blood warming device is essential to ensure safe transfusions. This study aims to design and modify a Blood Warmer Thawing device based on the Arduino Uno microcontroller as an innovative and cost- effective solution, particularly for healthcare facilities with limited resources. The system integrates a DS18B20 temperature sensor to monitor the temperature of the heating medium in real time, with data displayed on a 20x4 I2C LCD. Users can set the desired temperature via a 4x4 keypad, and the system automatically adjusts the heater performance based on the detected temperature. To enhance safety and operational efficiency, the device is also equipped with a buzzer as a warning indicator when the temperature exceeds the safe threshold, and utilizes a DC motor and cooling fan to maintain proper heat circulation. Test results indicate that the device is capable of maintaining the liquid temperature within the ideal range for blood transfusions, with high stability and fast response to temperature changes. This innovation offers a practical, affordable, and easy-to-implement solution to support effective and safe blood transfusion procedures in various healthcare settings.

Water is an essential component in the body that plays a role in various physiological functions, including concentration and learning performance in adolescents. However, teenagers' awareness to consume enough water is still low. This service activity aims to increase the knowledge and awareness of SMP Negeri 1 Kolaka students about the importance of drinking water through health education. The activity method was carried out by interactive counseling using PowerPoint media displayed through an LCD projector and conducted in the school hall on 19 November 2024, attended by 70 students from classes VII to IX. The material was delivered in an engaging manner and was complemented by discussion sessions. The results of the activity showed an increase in student enthusiasm and participation, as well as an awareness to start bringing drinking water to school and reduce the consumption of sugary drinks. This activity proved effective in fostering students' understanding of the importance of adequate hydration for health. The students expressed a greater willingness to incorporate healthier habits, particularly bringing water to school and making informed choices about hydration. Moreover, they became more aware of the negative impacts of sugary drinks. The activity's success highlights the importance of continued support from schools to create a healthy learning environment and to encourage healthy behaviors that can positively impact students' overall health and academic performance.

Liquefied Petroleum Gas (LPG) leakage remains one of the leading causes of fires in both household and industrial environments, highlighting the urgent need for early detection systems that provide fast and accurate warnings. This study aims to design and implement an LPG leakage detection device based on the ESP8266 microcontroller, utilizing the MQ-6 gas sensor and a real-time notification system through Telegram Bot integration. The system operates by reading LPG gas concentration via the MQ-6 sensor, which is then processed by the ESP8266 to automatically activate a buzzer alarm and a DC fan when gas levels exceed the threshold of 200 ppm. Additionally, the system sends instant alert notifications to the user through the Telegram application, allowing remote monitoring of gas conditions. Real-time gas concentration data are also displayed using a 16x2 LCD for direct visualization. System testing was carried out through controlled gas leakage simulations, and the results showed that the device is capable of responding rapidly, with a reaction time of less than 2 seconds after detection, while consistently providing accurate warnings. The integration of Internet of Things (IoT) technology significantly enhances the effectiveness and efficiency of the system, enabling practical and accessible monitoring. Overall, the developed device demonstrates strong potential as an innovative solution to improve safety, minimize fire risks, and raise public awareness regarding the hazards of LPG leakage, making it suitable for practical application in households and small industries.