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By looking at current technological developments that already use automatic sensors, the application of the concept to this system can be a solution for dealing with ornamental fish farming owners. In this research, a tool is made that can perform feeding, checking temperature, water turbidity, feed level, water level and water pump control, from this information will be sent to android by firebase automatically monitored and controlled anywhere via android. This tool is designed with ease of maintenance and is an extension of the existing tools. IoT technology is used to monitor online, based on Firebase and Nodemcu Esp8266. In this study, researchers used the research method of the Borg and Gall (1987) model from 10 steps to 6 steps. The results of this study were carried out by an expert validation test to get a value of 30 which means "Very Good (Valid)". While the effectiveness test by 10 users plus by experts and employee users get a total score of 35.16 which means the effectiveness test is classified as "Very Good (Valid)" it can be said that the new system is more effective than the old system.

In the current era, learning adheres to the 2013 curriculum which includes HOTS (Higher Order Thinking Skills) consisting of critical thinking competencies, creativity and innovation, communication skills, collaboration skills and selfconfidence. These five things need to be trained or improved for deaf children so that they can take part in learning well. So learning media products are made that can be used to recognize letters and numbers. This Learning Media is equipped with sign language to support the understanding of deaf children in addition, it is packaged with an attractive appearance so that deaf children are interested in learning it. Often in daily teaching and learning activities students still often experience problems in remembering the material being taught both in the introduction of letters and also the introduction of numbers and what becomes an obstacle for students learning must be done repeatedly so that they can remember it and can really understand what it means. being taught and also they are sometimes bored and lazy in learning. From the problems that occur above, it is necessary to have a learning media that can help children with disabilities, especially the deaf, especially for the introduction of numbers and letters so that they can easily understand and understand letters and numbers. not bored, bored and lazy in learning. Learning media in the form of an android application so that it can be used on smartphones which are currently very widely used by both teachers and parents of students with disabilities.

The advances in mobile technology have created a new learning method known as mobile learning technology or mobile learning. This method utilizes the use of smartphones which have become part of the daily life of people of all ages and levels of education. in this mobile learning ,android platform is selected. The reason for choosing android is that it is the most popular mobile OS. This learning is designed to run on Android with the aim that it can be used easily and can be run at any time as long as you carry an Android cellphone and there is an internet connection. This application is addressed to the Persatuan pemuda sandya karya mandiri desa reksosari kec suruh kabupaten Semarang, which is an activity of a youth group that is trying to develop and improve their video streaming channel . they need learning to improve their digital video processing skills to improve the quality of their video output. because this youth union consists of various ages and various educational backgrounds, the making of learning videos must be easy to operate, easy to display and does not require complicated equipment. The development of this application is based on usability which is the most important aspect of an application.

The method of learning the universe at TK Pertiwi Bebengan, Kec. Boja, Kab. Kendal, Central Java is still simple, namely explaining the material by displaying a 2-dimensional still image. This makes students unable to see directly the process of rotation and movement of celestial bodies in the universe. For this reason, it is necessary to create an application that can display the process through 3D animated moving images using Augmented Reality (AR) based technology. The research method used is Prototype, while the architectural design uses UML and software applications using Unity3D, Vuforia, Photoshop CS6 and Blender. The final results of the study are 1) on testing application features made with Unity3D and Vuforia software can run well, 2) on device testing there are 2 out of 4 smartphones that cannot run the application so that a minimum specification of a smartphone is required, 3) on distance testing with a height of 20 cm, it requires the right camera tilt angle, which is between200 to 900. The conclusion of the research is that this application can run well on mobile devices registered in Google's ARCore database and minimum specifications of Android 8.0 Oreo. In addition, it is necessary to pay attention to the right camera tilt angle so that it can display 3D objects.

Most of people in the world are familiar with smart phones or smartphones, and because of their very complete and practical uses, smartphone users are always increasing every year. Smartphones are used for various types of activities such as for social media, for entertainment such as playing games, doing office work, even personal matters such as financial management applications. Therefore, an application was created that can support personal financial recording so that it can make it easier for users.

Android-based applications have been widely used to do daily activities such as online shopping, playing games, video streaming, and watching sports matches. One of the most commonly used applications is applications that assist people for flight or train ticket reservations, hotel bookings, and other recreation purposes. Some tourism companies in Indonesia also develop Android-based applications to provide information and services for their business. Nevertheless, with many tourism destinations in Indonesia, not all tourist attractions have services through Android-based applications published on the Google Play Store. This study aims to design and implement Android-based applications for tourism information services in two tourist attractions as the case study, namely Tay Kak Sie Temple in Semarang City and Beach tourism in Bangka Island, to help tourists obtaining information about both tourist attractions. Both applications are implemented using Compro Mobile App Builder. The testing results using the black box method demonstrate that the implementation of the two applications can run according to the specified specifications.

Until now, the Beber Village Government, community complaints still have to go to the village office, Kadus houses or BPD. Complaints like that, of course, will take a little time and take a little longer. Data on public complaints is not stored as evaluation Material for evaluation and preparation of the RKPDes. Information submitted from the village government took a long time to reach the community. Although basically now there is a name WhatsApp, the public can also send WhatsApp messages by sending evidence of events and others. However, the complaint message will not be stored in its entirety, even a few days after the message arrives, it's easy to be crushed by other messages, making it difficult to find it again. In connection with the problems above, the researchers tried to design an application entitled Beber Village Community Complaints. In designing this application, the author uses the SDLC Waterfall model method, which is carried out step by step in accordance with the procedures in the Waterfall method. The admin application is built using the Codeigniter Framework version 3 with the PHP programming language. While the client/user uses Android which is built with the Flutter Framework which uses the Dart programming language. The resulting application is in the form of a Client Server. Adam uses the WEB Service view while the client/user uses the Android version. This application will exchange information between the community and the village and between the village and the community. This application aims to make it easier for both the community and the village in exchanging information, which then the information data can be stored intact in the database

The research method used in this research is Research and Development. The subjects in this study consisted of validation subjects consisting of material and media validators and test subjects consisting of 23 grade VII junior high school students. The research was conducted at SMP Negeri 10 Sungai Kakap. The instruments used in the study consisted of expert validation sheets, respondent questionnaires, and tests of mathematical understanding abilities. The purpose of this study was to determine the process of developing an Android-based math educational game using software construct 2 on mathematical abilities. The results of the study are as follows: The level of feasibility of an Android-based math education game using software construct 2 on the ability to understand the results obtained is 88.66% with very feasible criteria. The level of attractiveness of an Android-based math education game using software construct 2 on the ability to understand the results obtained is 88.19% with very interesting criteria. Improved mathematical understanding skills after the application of Android-based math education games. There is an increase From the calculation results obtained tcount> ttable = 8.85987> 1.71714, thus Ho is rejected Ha accepted.

This service aims to provide knowledge and practice of making online art appreciation learning media during the COVID-19 pandemic based on Android smartphones. The use of android smartphones as a tool for making learning media is based on the consideration that android smartphones have increasingly diverse uses because they are supported by the availability of various applications. The training was conducted for middle school art and culture teachers in Karanganyar. Implementation of the training using the lecture method to convey theoretical material about learning media, discussions to determine the concept of learning media to be made, and assistance in making learning media based on Android smartphones. The results of the training in the form of learning media are then carried out field trials to determine the success and shortcomings. After the learning media is improved, the learning media can be used in online art appreciation learning. Keywords: learning media, art appreciation, android smartphone

Queue theory is a theory that concerns the mathematical study of queues or rows.  waiting. A queue is a collection of entries or objects waiting for service. Before the patient or  The patient's family registering is expected to take a conventional queue number. This causes the patient  and the patient's family have to queue for a long time. In addition, patients and their families who  registering with a very large number of people there will be a dense crowd. This research design uses quantitative descriptive by using a design assessment questionnaire  physical android based outpatient registration queue number application. Descriptive quantitative method for  produce descriptive data in the form of scoring or assessment of the results of research respondents' questionnaires. The results of this study obtained the physical design of the -based Outpatient Registration Queue Number application  android for Nganjuk Health Center Patients. The physical design of the android-based outpatient registration queue number application at the puskesmas  nganjuk can make it easier to build applications.

Electrical equipment plays an important role in everyday life, from households, schools, hotels, offices, to industrial environments. Because it really helps humans in making work easier. The need for automated tools to facilitate human activities, makes the need for smart chips or microcontrollers increasing. A new breakthrough in the world of microcontrollers with the application of Arduino.Especially at SMPN 10 Salatiga, there are fish ponds and garden lights, which you forget to feed or not, while the officers forget to turn off the lights, causing the fish to die and the lights stay on even though it is noon. This study tries to implement Fish Feed Control and  automatic garden lights on and off using Arduino and scheduling, this is so that the fish stay healthy   and the garden lights can turn on or off according to the schedule desired by management. The author designed a garden lamp and automatic fish feed based on a case study at the school. The tool is designed with three sources of tool control. The first manual is pressing the fish feed manual button, the light switch and the reset button. Both semi-automatic, as a fish feeder, light ON/OFF and reset remote control with the Android application. The third auto is scheduled feeds and lights. This tool is designed to manage fish feed and garden area lighting. This tool is practical to use, inexpensive, useful, flexible and easy to build. The classification of this tool is sufficient for the needs of the school garden. Among the advantages of this tool is that it can be controlled remotely effectively 25 m without a hitch using the android application. The author hopes, this tool provides benefits and solves problems in schools.

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

ABSTRACT The use of mobile devices with the Android operating system which are used as supporting media and supplements in improving learning outcomes combined with demonstration methods and discovery learning or demon-disco learning is needed to help students improve learning outcomes in hydroponic plant cultivation vocational competency subjects at SMK. Kristen Terang Bangsa, because the use of android-based applications can provide new experiences regarding the use of information and communication technology, as well as provide opportunities for students to be able to learn more independently. The concept chosen as a learning medium is to present material about understanding, introduction to parts, types, and quizzes containing questions about hydroponic cultivation of plants. This research uses the Research and Development (RnD) product development method, using 6 out of 10 research stages, namely potentials and problems, data collection, product design, design validation, design improvement, product testing. The result of this research is to produce learning media in the form of android-based applications. The validity value of the media expert is 2.6 which is declared feasible, while the validity value of the material expert is 3.6 which is declared feasible, and is able to increase the average value in the hydroponic plant cultivation vocational competency subject at the Terang Bangsa Christian Vocational School which Initially 67 (with 13 students who had not reached the KKM) to 80 (with 4 students who had not reached the KKM).

Assessment of employee performance is expected to know precisely the success in completing work. Employee performance appraisal is also useful for companies in providing feedback to employees and can be used as a basis for agencies to evaluate employee performance. Most government services currently utilize information technology as an information service to the public and the agency's internal services. In institutions, it is necessary to increase and develop the capabilities, knowledge and skills of its human resources, so that it is expected to be able to produce apparatuses that have competitive competencies. Therefore, the authors designed and built an employee performance appraisal system which was implemented using Electre and Web-based and Android methods. It is expected to be able to assist agencies in evaluating employee performance so that they can remain consistent in carrying out their duties as Civil Servants (PNS) within the scope of services to the community. This research uses the R&D method. researchers only use up to step 6. Based on the results of trials of 10 respondents who have assessed the decision making system using the electre method, that the application of employee performance appraisal using aggregate ranking can help provide information on the level of employee performance based on predetermined criteria. Respondents agree that this system is more efficient in assessing employee performance with an average of the old system = 43.50% while the new system is = 84.50%.

 Ungaran Mountain has a height of 2050 meters above sea level, this mountain is suitable for beginner climbers who want to know more about climbing hobbies, Ungaran climbers themselves only take about 3-5 hours, depending on the speed of walking, the climbing route is also quite light and very suitable for heating before starting to climb higher mountains. Thus many novice climbers who want to try to climb and conquer Mount Ungaran, armed with minimal experience of mountain climbing, the risks they face are even greater, ranging from getting lost, being hypothermic to death while climbing. To make it easier for Ungaran mountain climbers who are dominated by novice climbers in this study, the Ungaran Mountaineering Track and Monitoring Application Based on the Global Positioning System (GPS) on the Android System "which was built to make it easier for Ungaran mountain climbers to access information provided by Ungaran mountain climbers. needed to climb Mount Ungaran, and it is also useful for the team at base camp to monitor climbers who climb..

This study aims to examine and evaluate the results of the implementation of an android-based labor payroll system. The purpose of this research is to find out the description of the system, application implementation, problems, and solutions on android-based payroll at Mitra Indo Agro. The results of the study obtained are used to evaluate the factors and parts of the payroll system for this android-based application that needs to be improved. This study uses a qualitative descriptive research method. Determination of informants using snowball sampling technique where the research subjects as many as 4 employees who are directly related to the android-based payroll process. Data collection techniques are through field studies consisting of interviews, observations, documentation, and literature studies. Data analysis techniques through data reduction steps, data exposure, data interpretation and drawing conclusions. The data validation technique uses source triangulation. The data presentation technique uses a program flow (flowchart) and fishbone diagrams (fish bones). The results of the research have shown that the Android-based GajiQ system helps provide large databases with the CRUD (Create, Read, Update, Delete) method , automate reports such as attendance recap, salary calculations, payroll history reports and make it easier to find labor data. The implementation of the Android-based GajiQ application can be a new medium of choice for companies to manage payroll in real time, quickly, and accurately that does not involve many parties in making payroll, payments, and payroll procedures. Problems found by the system are still bugs or crashes, error messages such as app force close appear. 

This research produces Artificial Fiber Spinning Learning Media that applies Augmented Reality (AR) for Class XI Students of TPSB SMK Texmaco Semarang as a learning aid. so that it can be used as a modern, effective, and interactive learning medium. This application was made with the aim of completing the limitations of depicting objects in existing learning media, helping students to more easily learn the material, improving student learning outcomes, and increasing the variety of media in learning. This study uses the Research and Development (RnD) method, using 6 out of 10 research stages, namely potentials and problems, data collection, product design, design validation, design improvement and product testing. The final result of making this learning media is an application in the format android application, used on every android-based mobile phone. The validity value of the media expert obtained a value of 3.2 which was declared feasible, the results of the material expert validation test obtained a value of 3.6 which was declared very feasible, and was able to increase the average value of the artificial fiber spinning subject class XI TPSB SMK Texmaco Semarang which Initially 61.5% with 17 students who had not reached the KKM to 80.5% with 4 students who had not reached the KKM.

Irrigation is a land irrigation system by damming water sources. Irrigation as the provision, regulation and disposal of water to support agricultural needs. Irrigation is generally used by farmers, especially farmers in rice fields to irrigate and provide water supply to agricultural land, monitoring water stock in rice fields must be done frequently because rice water needs must be balanced with a lack of water supply or excess water supply in rice fields is not good for rice growth . So far, farmers have monitored irrigation channels manually, the location of the rice fields from the farmer's house often causes rice plants to experience scarcity because the floodgates are not opened when the water supply is running low or experiencing water supply. excess because the floodgates are opened for too long, this will greatly disturb the growth of rice plants. Making a monitoring and control system for irrigation channels using a water level sensor installed on the ESP 8266 microcontroller (Wemos D1), the system uses a programming language c. This tool can be used to open the irrigation door if the water supply in the rice fields is below the minimum limit and will close the water gate when the water supply has reached the maximum limit, the servo motor is used to open and close the floodgates. . . The monitoring results obtained will be displayed to users in real time through the android application interface and will be stored in the form of a text file on the storage media.

Cloud computing is a technology that makes the internet a center for managing data and applications. With computer users are granted access (login). Cloud is a metaphor for the internet, as the cloud is often depicted in computer network diagrams. Gayo’s openwork cloud application is an android bases application that utilizes Cloud computing technology in the form of cloud Platform as a Service (SAAS) function as the main container or basis for running the system that will use in sales and providing notification services for the search for souvenirs typical of Takengon, namely Kerawang Gayo. Cloud computing is a technology that makes the internet a central storage server for managing data and information. This technology also allows users to freely manage and access information available on cloud storage which is of course connected to the internet network. This gayo filigree is now being created as a result of the home craft industry being embroidered on the cloth. The craft produces various types of souvenirs such as bags, key chains, women’s robes, men’s shirts, caps, bracelets, wallets, prayer mats, tablecloths, pillowcases, cellphone covers, and women’s and men’s traditional clothes, skirts, and scarves. Using the prototyping method is a software development method in the form of a physical working model of the system that functions as an early version of the system.

Augmented Reality (AR) and Virtual Reality (VR) which are one of the top ten strategic technology trends for 2019 and continue to be developed massively in this 2020, have been widely applied in various mobile applications by many companies in this industrial revolution era 4.0. AR can be applied to help the promotion for housing developers where users can see the 3-dimensional shape of the types of houses offered, while VR allows users to explore each part of the house in a virtual 3D. Pre-existing brochures are used as markers for this application to work, so that AR and VR applications can be a complement to promotional media. The design method used in this paper is Research and Development (RnD). Salespeople can offer types of houses to prospective customers without having to print multiple brochures, but with just one brochure and one android smartphone to present, so the promotion costs are more efficient.   Keywords: AR, VR, house.