Stunting in children has become an important global health problem and requires effective detection methods. This research has designed and developed an automatic child height measuring device equipped with a stunting detection feature to support early childhood health monitoring. This device utilizes an ultrasonic sensor to measure height in real time and compare the measurement results with applicable child growth standards to identify the risk of stunting in children. The design of this device has been designed so that it is ergonomic and easy to operate and can be used both in household environments and health facilities. Test results show that this device can provide height measurements with an accuracy rate of 98.5%, with an average time of 2.5 seconds for each measurement. And this device can detect stunting with a sensitivity level of 95%. Thus, this device can be an efficient device in assisting efforts to prevent and treat stunting in early childhood. This device is expected to make a significant contribution to improving the quality of early childhood health and supporting efforts to prevent stunting in the future. Keywords: Health, child health, stunting detection, height measurement ABSTRAK Stunting pada anak telah menjadi permasalahan kesehatan global yang penting dan memerlukan metode pendeteksian secara efektif. Penelitian ini telah merancang dan mengembangkan alat pengukur tinggi badan anak otomatis yang dilengkapi dengan fitur pendeteksian stunting untuk mendukung pemantauan kesehatan anak usia dini. Alat ini telah memanfaatkan sensor ultrasonik untuk melakukan pengukuran tinggi badan secara real time dan membandingkan hasil pengukuran dengan standar pertumbuhan anak yang berlaku untuk mengidentifikasi resiko stunting pada anak. Desain alat ini telah dirancang sehingga ergonomis dan mudah untuk dioperasikan, serta dapat digunakan baik di lingkungan rumah tangga maupun fasilitas kesehatan. Hasil pengujian menunjukkan bahwa alat ini mampu memberikan pengukuran tinggi badan dengan tingkat akurasi sebesar 98,5%, dengan waktu rata-rata 2,5 detik setiap pengukuran. Serta alat ini mampu mendeteksi adanya stunting dengan tingkat sensitivitas sebesar 95%. Dengan demikian, alat ini dapat menjadi perangkat yang efisien dalam membantu upaya pencegahan dan penanganan stunting pada anak usia dini. Alat ini diharapkan dapat memberikan kontribusi yang signifikan dalam peningkatan kualitas kesehatan anak usia dini serta mendukung upaya pencegahan stunting pada masa mendatang.

The three-phase induction motor is one of the most widely used types of electric motor in the industrial world. In its application to regulate the speed and improve the efficiency of the motor used the method of Variable frequency drive (VFD) by changing the input frequencies. The final task uses a simulated simulation method of the simulink matlab that will analyze the influence of frequency and voltage changes on speed, slip, and motor efficiency. The results show that frequency and voltage changes have an impact on induction motor performance that includes speed, slip, and efficiency. Often, they scream and shout. From a frequency of 50 Hz, every 10 percent decrease in the Frequency then the speed also decreases by about 10 percent. Frequencies of 50 Hz and 45 Hz produce speeds of 1440 rpm and 1295 rpm. For the slip, the increase in frequency leads to a decrease in the motor slip value. At the frequencies of 50 Hz and 45 Hz produced slide values of 4% and 16%. The highest efficiency is given at a torque load of 5 Nm and a frequency of 50 Hz with an efficiency of 97%. Keywords: 3-phase induction engine, VFD, Matlab, Frequency, Speed, Slip, Efficiency ABSTRAK Motor induksi tiga fasa adalah salah satu jenis motor listrik yang paling banyak digunakan dalam dunia industri. Dalam penerapannya untuk mengatur kecepatan dan meningkatkan efisiensi motor digunakan metode Variable frequency drive (VFD) dengan mengubah frekuensi masukan. Penelitian ini menggunakan metode simulasi matlab simulink yang akan menganalisa mengenai pengaruh perubahan frekuensi dan tegangan terhadap kecepatan, slip, dan efisiensi motor. Hasil penelitian menunjukkan bahwa perubahan frekuensi dan tegangan mempunyai dampak terhadap kinerja motor induksi yang meliputi kecepatan, slip, dan efisiensi. Frekuensi berbanding lurus dengan kecepatan dan efisiensi. Dari frekuensi 50 Hz, setiap penurunan frekuensi 10% maka kecepatan juga turun sekitar 10%. Frekuensi 50 Hz dan 45 Hz menghasilkan kecepatan 1440 Rpm dan 1295 Rpm. Untuk slip, kenaikan frekuensi menyebabkan turunnya nilai slip motor. Pada frekuensi 50 Hz dan 45 Hz menghasilkan nilai slip 4% dan 16%. Sedangkan untuk nilai efisiensi tertinggi terjadi ketika diberi beban torsi 5 N.m dan frekuensi 50 Hz dengan efisiensi sebesar 97%.

<p class="Abstract" align="center"><strong>ABSTRACT</strong></p><p class="Abstract">The development of IoT-based smoke detectors using NodeMcu ESP8266 and smoke sensors has achieved satisfactory results. This tool has succeeded in providing an effective solution as a responsive early detection of fire. The implementation of remote monitoring through the website allows access to smoke detection information from far-flung locations, providing flexibility and affordability in security surveillance. NodeMcu ESP8266 as an IoT platform proved to be the right choice, bringing the ease of connectivity of tools with the internet. The device's quick response to the presence of smoke at various sensor distances confirms its reliability in detecting potential fires. The success of this research highlights the great potential of IoT technology in improving the level of security, especially in detecting fire threats efficiently. With tested and responsive tools, further implementation and development of functionality can be explored. Overall, the development of smoke detectors promises to make a positive contribution to the understanding and application of IoT technology in the context of public security and safety.</p><p><em> </em></p><p><em>Keywords: </em><em>IoT-Based Smoke Detectors, NodeMcu ESP8266, Remote Monitoring, Fire Early Warning Systems, Sensor Technology</em><em>.</em></p><p> </p><p class="Abstract" align="center"><strong>ABSTRAK</strong></p><p class="Abstract">Pengembangan alat pendeteksi asap berbasis IoT menggunakan NodeMcu ESP8266 dan sensor asap telah mencapai hasil yang memuaskan. Alat ini berhasil memberikan solusi efektif sebagai pendeteksi dini kebakaran yang responsif. Implementasi monitoring jarak jauh melalui website memungkinkan akses informasi deteksi asap dari lokasi yang berjauhan, memberikan fleksibilitas dan keterjangkauan dalam pengawasan keamanan. NodeMcu ESP8266 sebagai platform IoT terbukti menjadi pilihan yang tepat, menghadirkan kemudahan konektivitas alat dengan internet. Respons cepat alat terhadap keberadaan asap pada berbagai jarak sensor menegaskan kehandalannya dalam mendeteksi potensi kebakaran. Kesuksesan penelitian ini menyoroti potensi besar teknologi IoT dalam meningkatkan tingkat keamanan, khususnya dalam mendeteksi ancaman kebakaran secara efisien. Dengan alat yang teruji dan responsif, implementasi lebih lanjut dan pengembangan fungsionalitas dapat diexplorasi. Secara keseluruhan, pengembangan alat pendeteksi asap ini menjanjikan kontribusi positif terhadap pemahaman dan penerapan teknologi IoT dalam konteks keamanan dan keselamatan masyarakat.</p>

<p class="Abstract" align="center"><strong>ABSTRACT</strong></p><p class="Abstract">The fence acts as the first layer in maintaining the security of a building. One of the technologies used to control the opening and closing of the gate is the use of fingerprint sensors. The fingerprint sensor functions by recording and storing a person's fingerprint pattern through the sensor module, then using Arduino to make identification. If the detected fingerprint matches the stored data, the stepper motor will be activated to open the gate. The door will remain open until an object is detected on the track by the infrared proximity sensor, which will then cause the gate to close again. From the results of the tests that have been carried out, it can be concluded that the performance of the automatic turnstile controller prototype is in accordance with the predetermined design. The fingerprint sensor successfully detects five fingerprints that have been recorded, with verification that matches the database, causing the stepper motor to rotate to open the gate. In addition, the fingerprint sensor was also able to identify one fingerprint that was not registered in the database, so the stepper motor was not activated to open the gate. The infrared proximity sensor successfully detects the presence of objects on the track, and the program commands the stepper motor to close the gate. From the results of five tests, the average motor voltage was 5.0 V, the current was 0.0490 A, the rotation was 12.0 rpm, and the time required to open the gate was 5.18 seconds. As for closing the turnstile, the average motor voltage is 4.9 V, current is 0.0488 A, rotation is 11.7 rpm, and the time required is 5.22 seconds. This shows that the prototype has successfully achieved the expected performance.</p><p> </p><p class="IndexTerms">Keywords: Automatic Turnstile, Sensor, Fingerprint, Infrared Proximity, Arduino Uno.</p><p> </p><p class="Abstract" align="center"><strong>ABSTRAK</strong></p><p class="Abstract">Pagar berperan sebagai lapisan pertama dalam menjaga keamanan suatu bangunan. Salah satu teknologi yang digunakan untuk mengontrol pembukaan dan penutupan pintu pagar adalah penggunaan sensor sidik jari. Sensor sidik jari berfungsi dengan cara merekam dan menyimpan pola sidik jari seseorang melalui modul sensor, kemudian menggunakan Arduino untuk melakukan identifikasi. Jika sidik jari yang dideteksi sesuai dengan data yang tersimpan, motor stepper akan diaktifkan untuk membuka pintu pagar. Pintu akan tetap terbuka sampai ada objek yang terdeteksi di lintasan oleh sensor proximity infrared, yang kemudian akan menyebabkan pintu pagar tertutup kembali. Dari hasil pengujian yang telah dilakukan, dapat disimpulkan bahwa kinerja prototipe pengendali pintu pagar otomatis sesuai dengan perancangan yang telah ditetapkan. Sensor sidik jari berhasil mendeteksi lima sidik jari yang telah direkam, dengan verifikasi yang sesuai dengan database, mengakibatkan motor stepper berputar untuk membuka pintu pagar. Selain itu, sensor sidik jari juga mampu mengidentifikasi satu sidik jari yang tidak terdaftar dalam database, sehingga motor stepper tidak diaktifkan untuk membuka pintu pagar. Sensor proximity infrared berhasil mendeteksi keberadaan objek di lintasan, dan programnya memerintahkan motor stepper untuk menutup pintu pagar. Dari hasil pengujian sebanyak lima kali, diperoleh rata-rata tegangan motor sebesar 5,0 V, arus sebesar 0,0490 A, putaran sebesar 12,0 rpm, dan waktu yang dibutuhkan untuk membuka pintu pagar adalah 5,18 detik. Sedangkan untuk menutup pintu pagar, rata-rata tegangan motor adalah 4,9 V, arus 0,0488 A, putaran 11,7 rpm, dan waktu yang dibutuhkan adalah 5,22 detik. Ini menunjukkan bahwa prototipe telah berhasil mencapai kinerja yang diharapkan dan dapat digunakan secara efektif dalam aplikasi sehari-hari.</p>

<p><em>Internet of Thing</em><em> </em><em>(IoT</em><em>) technology is able to manage devices to collect and exchange data over the internet network. IoT is one of the keys to implementing Industry 4.0 in various sectors such as manufacturing, transportation and even education. IoT can be utilized for laboratory device management. The Production Systems Laboratory, Faculty of Engineering, Dian Nuswantoro University has CNC-based machines such as a CNC router machine with the G-Eike brand type WK1212. Through the implementation of IoT, user data, operational time, and electricity such as voltage and current while the CNC machine is operating can be sent and stored on a database server. Furthermore, analysis of the data is carried out for various purposes such as predicting machine maintenance schedules. The results of the research that has been carried out regarding the design of user authentication systems and electrical monitoring of the CNC machine have been tested with good results in extracting the required data via IoT to then be used in predicting machine maintenance. It is known from the test results that the user (student) authentication system can be carried out by inputting a username and password based on student data registered by the laboratory assistant. Electrical data (voltage, current, power, energy, frequency and power factor) is successfully sent from the control panel periodically every 10 seconds to the broker. The broker managed to save the data received into the MySQL database.</em> </p><p> </p><p class="IndexTerms"><strong>Keywords</strong>: Internet of Thing, CNC Router, G-Weike WK1212, Autentikasi, Monitoring.</p><p> </p><p class="Abstract" align="center"><strong>ABSTRAK </strong></p><p class="Abstract">Teknologi Internet of Thing (IoT) mampu mengelola perangkat untuk mengumpulkan serta bertukar data melalui jaringan internet. IoT menjadi salah satu kunci dalam penerapan industri 4.0 di berbagai sektor seperti manufaktur, transportasi, dan bahkan pendidikan. IoT dapat dimanfaatkan untuk manajemen perangkat laboratorium. Laboratorium Sistem Produksi Fakultas Teknik Universitas Dian Nuswantoro memiliki mesin-mesin berbasis CNC seperti mesin CNC router dengan Merk G-Eike tipe WK1212. Melalui penerapan IoT maka data pengguna, waktu operasional, dan kelistrikan seperti tegangan dan arus selama mesin CNC beroperasi dapat dikirim dan disimpan pada server basis data. Selanjutnya, analisis terhadap data tersebut dilakukan untuk berbagai keperluan seperti memprediksikan jadwal pemeliharaan mesin. Hasil dari penelitian yang telah dilakukan terkait perancangan sistem autentikasi pengguna dan monitoring kelistrikan mesin CNC tersebut telah diuji dengan hasil yang baik dalam menarik data-data yang dibutuhkan melalui IoT untuk kemudian dapat dimanfaatkan dalam prediksi pemeliharaan mesin. Diketahui dari hasil uji tersebut sistem autentikasi pengguna (mahasiswa) mampu dilakukan melalui input username dan password berdasarkan data mahasiswa yang didaftarkan oleh asisten laboratorium. Data kelistrikan (tegangan, arus, power, energi, frekuensi dan power factor) berhasil dikirim dari kontrol panel secara periodik tiap 10 detik ke broker. Broker berhasil menyimpan data yang diterima ke dalam database MySQL.</p>

The maximum output voltage of the audio amplifier is limited to the magnitude of the power supply voltage of the power transistor or the operational amplifier on the final amplifier. This limits the maximum power of the audio amplifier output. The way to enlarge the output power of the audio amplifier without increasing the voltage is the bridge method or bridged modes. With this method a bridge amplifier will be generated. This Bridge Amplifier is also known as Bridge-Tied Load (BTL) or Bridged Transformerless. The principle of Bridge Amplifiers is to use a pair of final amplifiers whose outputs have opposite phase each other. There are 3 ways to make a pair of power amplifiers have opposing phases: with internal modification, with an audio transformer (phase splitting audio input transformer) and with a simple active phase reversal splitter circuit). This paper will discuss Bridge Amplifiers with simple phase inverting circuits. A pair of audio power amplifiers using two TDA2050 chips which are operated at ± 19 Volt supply voltage. The phase inverting circuit using IC TL072. Sinusoidal signal with an amplitude of 200 mVp and a frequency of 1 KHz is used as an input signal. The results to be observed and measured are gain, input, output and bandwidth of the bridged amplifier compared to the usual amplifier

<p><em>One of the problems that often occurs in the use of ground cables is insulation failure. This condition can cause leakage current in the 20 kV cable on the secondary side of the transformer. The greater the value of the leakage current, the more heat will cause the insulation to worsen. If this condition is not handled immediately, it can lead to the opportunity for a short-circuit current between the phase and ground. Therefore, an Internet of Thing-based monitoring tool is needed that can determine the amount of leakage current contained in the 20 kV cable on the secondary side of the transformer by applying the Kalman filter method and sending it to the substation operator using Wifi. Based on the test, it was found that the implementation of this monitoring tool obtained more constant measurement results than the actual measurement value using a measuring instrument with an average error per phase, 1.5594% phase R, 1.5535% phase S, 1.5548% phase T.</em></p>

<p><em>One of the steps needed in patients with fractures of the knee joint is therapeutic exercises guided by physiotherapists. Therapeutic exercise is a physiotherapy modality by moving the joints both actively and passively. Inspired by this, the Portable Continuous Passive Motion (CPM) tool was created which is a physiotherapy aid for patients after surgery or knee surgery. Portable Continuous Passive Motion (CPM) has been developed based on IoT. Portable Continuous Passive Motion (CPM) uses Arduino LoRa as a micro controller, a stepper motor as a driver and uses a software application as a controller. The form of this research is research and development. From the results of the development, it can be concluded that Portable Continuous Passive Motion (CPM) can be useful for postoperative fracture patients as a practical and flexible postoperative manual therapy tool.</em></p>

<p class="JOURNALBODY"><em>The development of electric vehicles is in rapid progress, especially in terms of the main engine drive. The use of solenoid can be applied as an alternative driving electric vehicles instead of a dc motor as the main driver. In this paper, the prototype solenoid machine is applied by using 4 inductors controlled by an Arduino microcontroller and the solenoid driver based on application of Mosfet L298N. The prototype runs successfully. Based on the experimental results, the greater the frequency value applies to the driver, the faster the solenoid moves. The acceleration occures due to the electromagnetic field which is getting stronger and the field is proportional to the frequency value, so the solenoid movement is faster.</em></p>

<p><em><span lang="EN-US">The purpose of this research is to design and implement an automatic acrylic carving and cutting tool using a microcontroller-based 3-axis CNC machine. Computer Numerical Control (CNC) is a machine technology that is operated automatically to support the demand for a product that has a complex shape and high accuracy. In general, the construction of a 3-axis CNC machine and its working system is synchronization between the computer and its mechanics. This tool has a work process by utilizing the G-Code method as a command on the machine to carry out engraving and cutting automatically. The G-code was obtained from a previously designed image and then converted using the Aspire 9.0 software. Engraving and cutting is done by sending the G-code file to the microcontroller via the Universal G-code Sender software, then the microcontroller sends a signal to drive the motor driver which then drives the stepper motor so that the actuator movement is generated according to the image in the G-code file. Simultaneously the spindle motor will be active to engrave or cut acrylic. In this study, a trial scenario was carried out to determine the precision and accuracy of the tool, namely by engraving and cutting flat shapes such as squares, circles, triangles and segments. The percentage of success generated from this tool is 97,08% to 100%. Furthermore, testing is carried out to make products in the form of engraving writing, logos and calligraphy. Apart from that, we also tested cutting letters and key chains. When the test is carried out, the accuracy level is 1mm. </span></em></p>