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Design and Development of an Internet of Things (IoT)-Based Fish Freshness Detection Device. Guided by Mrs. Henna Nurdiansari, S.T., M.T., M.Sc. and Mrs.  Monika Retno Gunarti, S.Si.T., M.Pd. Indonesia has a great potential in fish production, reaching 12 million tons annually, accompanied by an increase in fish consumption. However, significant challenges arise regarding food safety, especially concerning the sale of non-fresh fish and the presence of formalin. As an innovative solution, a fish freshness and formalin detector based on IoT was developed. This device utilizes the TCS3200 sensor to detect color intensity and the HCHO sensor to detect formalin. This research employed the Research and Development (R&D) method to produce an effective detection device. When the LED is green without a buzzer sound and the LCD displays "Fresh Fish" or "Formalin Free," the fish can be confirmed to be fresh and free of formalin. However, if the LED is red, the buzzer turns on, and the LCD displays "Non-Fresh Fish" or "Fish with Formalin," the fish is considered to be below standard or contains formalin. The device categorizes fish condition into three groups: green (fresh), yellow (less fresh), and red (not fresh), reflecting the fluctuating freshness level. When the HCHO sensor reads a value above 0.5 ppm, the fish is considered to contain formalin, while below 0.5 ppm is considered safe and free from formalin. Therefore, this device can be an effective solution in detecting fish freshness and formalin content, ensuring food safety for consumers.

The Covid-19 virus emerged in late 2019 in Wuhan, China, rapidly spreading to over 190 countries worldwide. Governments implemented various measures, including body temperature checks as an initial step in detecting Covid-19 symptoms. However, manual body temperature measurement using a thermogun has limitations due to direct contact. Therefore, this research develops an automatic, contactless body temperature monitoring system based on Arduino Uno to improve efficiency and reduce physical contact. The system uses an HC-SR04 ultrasonic sensor as a distance limiter for temperature measurement, an MLX-90614 infrared temperature sensor for detecting body temperature, and an Arduino Uno to process data displayed on an LCD in degrees Celsius, with a buzzer as a notification indicator. The test results show that this system achieves a body temperature measurement accuracy of 99.53%, producing results close to the reference device when the object and sensor are within a 1–5 cm range and aligned in a parallel position.

This Space Security System is a system that utilizes the existing Internet Network to monitor a room remotely or from a different location. With the aim of making it easier to limit employee access rights and monitor the presence of people in the room.So the author made a room security system tool using the Internet of Things (IOT) which was implemented at the Demak Regency Communication and Information Service. The way this system works is only employees who have access rights who can enter the room by attaching an RFID card to the RFID Reader sensor, and the way the PIR sensor works is to monitor human presence, when there is infrared or human emission it will send data to the web if it is in the room has people and the red LED lights up and the buzzer sounds, while the push button button is when the push button button is pressed the solenoid will open. By making this design, it will help improve room security at the Demak Regency Communication and Information Service, especially the Encryption Room

Burglary involves forced or unauthorized entry, which leads to damage or loss of property having monetary or emotional value and, more severely, puts lives at risk. The dire need for the safety of lives and properties has attracted so much research on burglary alert system using Internet of Things (IoT) technology. Most of the research focused on alerting the users of burglary attempts using any or a combination of two notification methods: SMS, call, and email. This study emphasizes three-mode notification that combines SMS, call, and email using the application of IoT technology in a burglary alert system, which uses a Passive Infrared (PIR) sensor for burglar detection to ensure that Homeowners or authorized personnel get alerts in events of imminent attempt to break-ins. The study also details the sensor integration with its supporting components, such as the central hub or microcontroller, buzzer, LED, and network interface in the development of the system. The software was developed to facilitate seamless integration with the hardware, ensuring timely and accurate event detection and subsequent alert generation using Arduino IDE programming language, a framework based on the C++ language. The system effected the 3-mode notification to ensure that users get notification in case of an imminent break-in since the failure of the three modes simultaneously is extremely rare. The system’s performance based on its responsiveness on the 3-mode notifications was evaluated, and an average of 83.56% responsiveness was obtained, indicating an acceptable response time.

Setiap pemilik rumah atau ruangan seringkali mengalami kelalaian ketika meninggalkan rumah atau ruangan. Salah satu kelalaian yang sering terjadi yaitu pintu yang belum terkunci. Penggunaan anak kunci untuk saat ini sangat mudah dirusak oleh pelaku kejahatan karena anak kunci yang digunakan masih kurang efektif dan mudah terjadi kehilangan saat pemakaian. Penelitian ini bertujuan untuk membantu pengguna dalam mengatasi kelalaian terhadap penguncian pintu apakah kondisi pintu sudah terkunci atau belum dari jarak dekat maupun jauh melalui smartphone. Prototipe ini dibangun dengan metode Prototyping dan diprogram agar dapat dikontrol menggunakan mikrokontroler ESP8266 berbasis Internet of Things (IoT) yang dilengkapi dengan komponen MC-38 Magnetic sensor, motor servo SG90, buzzer, RFID, dan kunci gerendel dengan terhubung pada penyimpanan Supabase dan Firebase yang nantinya akan ditampilkan pada aplikasi smartphone yang dibuat menggunakan Flutter. Prototipe ini dapat berfungsi dengan baik ketika melakukan penguncian dengan kunci gerendel pada pintu baik secara jarak jauh mapun dekat serta mendeteksi kondisi pintu yang terbuka atau tertutup dengan menyalakan buzzer dan mengirimkan data log juga notifikasi pada aplikasi smartphone. Hasil dari prototipe ini diharapkan dapat mengurangi pelaku kejahatan yang menyusup ke rumah atau ruangan melalui pintu masuk sebagai jalan utama memasuki rumah ataupun ruangan.

In this research we design and build a portable gas leak detection system for household gas distributors. The performance of the designed system is described and evaluated. The system aims to speed up the time in detecting gas leaks. System portability allows implementation and monitoring in the form of a website. System design and performance are assessed and proven effective in detecting gas leaks, providing a reliable and efficient solution for gas distributors. The method used is the conditional method where the gas leak detection system is made with Nodemcu esp8266, sensor mq6, buzzer, step-down lm2596, and led. The results obtained from testing the leak detection system explain the testing and evaluation of the gas cylinder inspection system. The system is designed to check 3kg gas cylinders, category level 1 with numbers 300-500, category level 2 with numbers 500-750, category level 3 with numbers 750-1000, and category level 4 with numbers higher than 1000. Detection of gas leaks in each valve takes about 13 seconds to detect leaking gas, send data to the website and provide output to the buzzer.

Internet-of-Things (IoT) merupakan teknologi yang mengintegrasikan berbagai peralatan dengan Internet. Salah satu pemanfaatan IoT adalah sistem kontrol elektronik pada berbagai peralatan rumah. Peralatan rumah dapat dilengkapi dengan mikrokontroler, sensor, dan aktuator, serta modul komunikasi, sehingga dapat dihubungkan ke internet dan dipantau dari jarak jauh. Salah satu peralatan atau objek yang ada di rumah adalah tempat sampah yang umumnya terbuat dari plastik, tetapi umumnya belum dapat dipantau dan dikontrol otomatis. Tujuan penelitian ini adalah untuk merancang sistem kontrol untuk membuka dan menutup tempat sampah secara otomatis menggunakan Arduino sebagai pengontrol sistem, sensor ultrasonik sebagai pendeteksi objek yang mendekat, motor servo yang berguna untuk menggerakkan tutup tempat sampah, dan buzzer serta LED sebagai indikator ketika terdapat objek yang mendekat. Hasil pengujian sistem menunjukkan bahwa tempat sampah dapat membuka tutupnya secara otomatis saat mendeteksi objek pada jarak paling jauh 50 cm dengan delay selama dua detik, dan kemudian akan tertutup secara otomatis ketika objek tersebut menjauh dari tempat sampah tersebut.

In everyday life, trucks are used to transport goods. Not infrequently seen a lot of use of trucks that exceed the carrying capacity. Accidents on the highway include the impact caused by trucks that are overloaded or overloaded. The purpose of this study is to reduce the risk of accidents due to overloading or overloading. The truck load monitoring system aims to make it easier for truck users to see the truck load weight directly through a smartphone with an application. In addition, users can also see the excess weight of the load and there is an overweight indicator in the form of a buzzer. With this system, users can reduce the risk of accidents on their vehicles. This system consists of a load cell sensor and HX711 module as a weight detector, NodeMCU as a microcontroller and data transmission, firebase as a database, and android studio as a container for creating applications. Payload weight data can be monitored remotely or close according to the principles of the Internet of Things (IoT). The results of this study indicate that the system works well with the sensor accuracy level on the prototype truck 1 and truck prototype 2 above 95%. Writing data on firebase, reading firebase through the application and testing the buzzer has a 100% success rate percentage. There is no diference transmission delay between serial monitor and firebase.

Seiring perkembangan zaman dan teknologi yang pesat saat ini, dalamkehidupan sehari-hari manusia tidak pernah lepas dari aktivitasnya untuk berinteraksi dengan peralatan elektronik yang membantu dan mempermudah pekerjaan manusia. Salah satunya adalah brankas otomatis dengan keamanan menggunakan sensor facerecognition dan fingerprint supaya perhiasan dan barang berharga lainnya lebih terjamin keamanannya dengan sistem keamanan ganda pada brankas.   Proyek akhir ini bertujuan untuk mengembangkan sebuah teknologi yang memanfaatkan beberapa macam komponen sensor, dimana komponen sensor tersebut melibatkan sensor getar untuk mengirimkan sms gateway jika brankas berpindah tempat, dan sim800l akan mengirimkan titik kordinat brankas berupa sms gateway. Dan GPS akan melacak keberadaan brankas sesuai titik kordinat tersebut. Buzzer akan berbunyi untuk memberikan tandaatau notifikasi.

Stroke is the number one cause of disability and the second cause of death in the world. Blood flow that is not smooth in stroke patients causes hemodynamic disorders including changes in the value of oxygen saturation in the blood (SpO2) which can interfere with the function of internal organs including the heart due to lack of oxygen intake. So we need a system to monitor the oxygen saturation value which can be used as an early indicator in recognizing stroke patients. This system uses detection of two sensors to measure oxygen saturation in the blood, a microcontroller to process data, a monitor to display data, a buzzer as a warning of the lower limit of measurement and a micro sd card module to store measurement data that has been running. Parameters displayed include the date of measurement, patient ID, SpO2-1, SpO2-2, last SpO2-1 and last SpO2-2. This system will measure and display the SpO2 value of both right and left arms simultaneously. Stroke patients who experience muscle weakness in one hand may experience different values with a hand that does not experience muscle weakness. This study aims to develop an SpO2 monitoring system that will be used to detect stroke patients with non-invasive methods. The results show that the system has been developed and can be used to measure the patient's SpO2 from both hands simultaneously with a measurement error rate of ±2% for each sensor from standard medical equipment.

In this final project the author discusses the problem entitled "Design of Smoke Detector and Room Temperature of SAP ERP Server at PT Apac Inti Corpora". This design aims to support the improvement of the security system in the server room with smoke and temperature detectors and microcontroller-based automatic countermeasures. Against the background of problems with sensors and countermeasures systems in the server room and lack of insight into sensor installation. This tool uses a gas sensor MQ-2 as a smoke detector, a DHT-11 sensor as a temperature detector, Arduino as a microcontroller that controls I/O, buzzer and LED as an alarm, a fan as a temperature controller, and an LCD to display conditions in the room. The output of the MQ-2 and DHT-11 sensors will be processed in a programmed microcontroller so that it can display conditions on the LCD. This tool will turn on the alarm and fan if smoke and high temperature are detected at the specified conditions.

Article history: Received 30 Mei 2020 Received in revised form 2 Juni 2020 Accepted 10 Juni 2020 Available online 12 Juni 2020 ABSTRACT Alcohol is the common name for organic compounds that have a hydroxyl group attached to carbon and hydrogen atoms. The alcohol that is commonly found in liquor is ethyl alcohol or it is also called ethanol, but it is usually referred to as alcohol alone. Drinks with an alcohol content of 40% can lose consciousness, leading to accidents for alcohol-affected drivers. To detect alcohol in the body using an alcohol tester. Researchers tried to make a measuring instrument for alcohol levels in the body using several components such as Arduino nano, MQ 3 sensor, OLED, charger module, battery, resistor, push button, and buzzer. The design of a portable alcohol level detector through breath can work well, namely the results of the reading of alcohol levels in the body by the MQ-3 sensor through the breath and displayed on the Oled Display in units of% BAC (Blood Alcohol Concentration), in the sample comparison of the alcohol level reading between Final project tool with a comparison tool alcohol tester obtained the percentage difference in an average of 0.01% BAC. Keywords: Alcohol, Arduino Pro Micro, MQ-3 Sensor, OLED, Charger Module, Battery, Resistor, Push Button, and Buzzer

This research was carried out by comparing the DS18B20 sensor and the MLX 90614 sensor to detect the accuracy of detecting human body temperature which is used to detect Covid 19 symptoms. In this experiment, 10 trials were carried out with different human segments detected using the sensor. In the experiment, it was found that the MLX90614 sensor is more suitable to be used for development with an IoT-based system because it does not need to come into contact with the skin of the human body. The MLX90614 sensor will detect the temperature and change it to one Celsius unit then send it to the firebase database which will then be picked up by the android application which is held by the security officer so that the temperature can be known remotely. When the temperature is more than 38.5 Celsius it will turn on the buzzer sound which can be heard from a distance which indicates the temperature is above 38.5 Celsius and on android will also display a danger sign

Peristiwa kebakaran merupakan kejadian yang sangat umum terjadi, banyak faktor yang mempengaruhi, di antaranya ialah; hubung pendek arus listrik, kebocoran gas, putung rokok. Kebakaran yang terjadi pasti akan berujung pada kerugian baik itu kerugian materil maupun korban jiwa. Pencegahan sejak dini sangat diperlukan yaitu dengan penerapa sitem pendeteksi kebakaran atau alarm kebakaran. Rancangan alat pendeteksi kebakaran terdiri dari flame sensor sebagai pendeteksi api, sensor MQ-2 sebagai mendeteksi adanya asap dalam ruangan. Serta dilengkapi dengan mikrokontroler Arduino. Berdasarkan kedua sensor indikator kebakaran ini akan ditampilkan melalui LCD dan apabila terjadi kebakaran akan di iringi dengan suara peringatan dari buzzer. Uji coba sistem terlebih dahulu melalui software proteus 8 profesional dengan tujuan membangun suatu alat pendeteksi kebakaran secara otomatis menggunakan flame sensor dan sensor asap MQ2, yang dilengkapi dengan LCD LM016L berbasis mikrokontroller arduino. Hailnya mampu memberikan gambara kepada kalayak umum bagaimana sistem kerja dari alat pendeteksi kebakaran/ alarm kebakaran yang dapat di representasikan memalui software proteus.