Guava is a fruit plant with various benefits for humans. Both the leaves and the fruit can be used to treat various diseases. As an example of the fruit to treat Dengue Hemorrhagic Fever, Tyfus, and so forth. The leaves can be used as traditional medicine to treat cough and diarrhea.
In the highlands it is indeed cold and there is little possibility of plantation fires. However, fires can occur as a result of human activity both intentional and unintentional. The location of the plantation land that is relatively far from the residential population makes fires sometimes known too late. Therefore, it is necessary to create a tool to monitor the temperature and concentration of guava plantation smoke from a distance every day so that if the temperature or the density of smoke reaches a certain number that indicates the occurrence of fire then the tool will immediately send a notification via SMS to the plantation owner. In addition, the tool will immediately pour water from the reservoir or water reservoir into the guava plantation. In the water reservoir there is a tool to detect the volume of water. The device to be created uses the LM35 temperature sensor, MQ-2 smoke sensor, HC-SR04 Ultrasonic sensor, Relay, Arduino Uno R3 microcontroller and GPRS Shield along with the GSMSIM Card.

Utilization of a mobile device with the Android operating system that is used as a supporting medium and supplement in improving learning outcomes combined with demonstration and discovery learning or demon-disco learning methods is needed to help students improve learning outcomes in vocational competence subjects in hydroponic crop cultivation in vocational high schools 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 media is to explain the material about understanding, introduction of parts, types, and quiz containing questions about hydroponic plant cultivation. This research uses the Research and Development (RnD) product development method, using 6 out of 10 stages research that is the potential and problems, data collection, product design, design validation, design improvement, product trials.
The results of this study are to produce learning media in the form of Android-based applications. The validity value of media experts is 2.6 which is declared feasible, while the validity value of material experts is 3.6 which is declared feasible, and is able to increase the average value in the subject of vocational competence in hydroponic cultivation in Christian Terang Bangsa Vocational Schools which initially 67 (with 13 students who had not yet reached KKM) to 80 (with 4 students who had not yet reached KKM).

In Pekalongan, precisely in the village of Soko Kembang, Petungkriyono sub-district, as many as 31 units of PLTS were made. This PLTS works stand alone, with the SHS system. Each SHS unit consists of a 50 Wp solar panel, three light points, a 70Ah battery, and a Box Control Unit. Based on preliminary field studies, the use of SHS is very useful and helps the community at night especially students and mothers who have small children and helping residents of Soko Kembang village, a remote village that had previously relied on lighting from oil lamps and rental generators.
The use of solar power plants has an impact on the economic life of the community, which is assessed from an increase in the people's economy. This is evidenced by the high payback.

The community's need for electricity is getting higher, so alternative energy sources such as solar heat are needed to replace energy sources from fossil fuels in meeting electricity needs. In this paper we design a two-axis solar tracker with an LDR sensor. A sun tracking system is a unit that is combined into one to control the position of the tracking device with the aim of making the surface of the solar panel module always facing the direction of sunlight. This research discusses the Prototype of the Sun Tracking System in Arduino Based Solar Power Generation Systems to get maximum solar energy. This system will make solar panels move automatically so that sunlight absorption can be maximized. The main control uses Arduino nano which gets input values ??from the LDR sensor then is processed to the output system. With the control system method can automatically be seen the difference in the results of a fixed solar panel with a solar panel with a tracker, from the comparison we get a solar panel with a tracker to get more optimal results.
 

STEKOM College which has branch campuses in several places. Employee performance appraisals are carried out by superiors and branch campus coordinators using Ms. Excel. The results of the performance assessment are sent to the staffing department via e-mail. The personnel department will recap the results of the performance appraisal to be conveyed to the leadership. This assessment process takes a long time and tends to be inefficient. In this study, a web-based Employee Performance Appraisal System was developed that can be accessed online by relevant appraisers at the central campus and STEKOM branch campuses. The System Development Method uses a Research and Development (R&D) approach. Assessment elements include 6 (six) aspects, namely: Service Orientation, Integrity, Commitment, Discipline, Cooperation and Leadership. The results of the performance appraisal of educators (lecturers) apart from being used internally as a measurement of lecturers' work behavior, can also be used externally for the assessment of work behavior when the lecturer makes Employee Performance Targets (SKP), as well as being used to assess the performance of education personnel. System modeling uses the Unified Modeling Language (UML). Making the source code program using the Hypertext Preprocessor (PHP) programming language with a web-based MySQL database using Notepad ++ software. The results obtained from the use of the employee performance appraisal system, performance reports can be obtained more quickly, making it easier for the staffing department to obtain data on employee performance appraisals effectively and efficiently.

Sistem Pendukung Keputusan merupakan sistem informasi interaktif yang menyediakan informasi, pemodelan dan pemanipulasian data.Sistem itu digunakan untuk membantu pengambilan keputusan dalam situasi yang semiterstruktur dan situasi yang tidak terstruktur.
Akibat target tahunan perusahaan masih sulit untuk dicapai, juga dikhawatirkan apabila konsumen berpindah ke perusahaan lain yang mungkin memiliki produk yang serupa dengan harga lebih murah. Oleh karena itu, harus dilakukan pembaharuan strategi promosi dalam bentuk potongan harga atau diskon khusus untuk konsumen yang total pembeliannya terbanyak dalam kurun waktu setahun.
Berdasarkan permasalahan yang ada, maka dibuatlah suatu program sistem informasi pendukung keputusan pelanggan tahunan dan pemberian diskon melalui rekap total pembelian konsumen dalam kurun waktu setahun. Untuk metode perhitungannya sendiri menggunakan Metode SAW sebagai pendukung keputusan pemilihan pelanggan terbaik dan TOPSIS sebagai pendukung keputusan pemberian diskon.
Dari hasil penelitian dihasilkan : dengan menggunakan bahasa pemrograman PHP dapat digunakan untuk membantu perusahaan untuk memilih pelanggan terbaik dan penentuan diskon secara valid, aplikasi yang telah dibuat dapat digunakan sebagai alat bantu bagi pengambil keputusan dengan tetap berbasis pada sistem pendukung keputusan lebih efektif dalam pemilihan pelanggan terbaik dan penentuan diskon menggunakan metode SAW (Simple Additive Weighting) dan Topsis (Technique for Order Preference by Similarity to Ideal Solution).
kata kunci : SPK, SAW, TOPSIS

Department of Culture , Tourism , Youth and Sports Central Aceh district especially in tourism is in charge of managing and developing infrastructure for tourism, the selection of a tourist attraction right capable of giving the best decision with the information on the sights with AHP ( Analytical Hierarchy Prsocess ) that match the criteria , Election Decision Support System using AHP Attractions Java based , Using Netbeans and MySQL as data storage .

CV Aintzane Mandiri is a company engaged in the field furniture. The Raw Material Manager at CV Aintzane is not yet optimal. Purchase Raw materials need to be considered because they will affect the maturity raw material needs and affect the production process.
The information system for the supply of raw materials is needed by the company determination of expenditure, input of raw materials, and can minimize supply of raw materials for optimal use throughout the process production.
Designing and building a procurement information system using raw materials Material Requirement Planning (MRP) method with programming language Microsoft Visual Basic 6.0, WAMP as server and MySQL as database. The results obtained from this information system can be obtained planning raw material requirements and production optimally and accordingly with company expectations.
Keywords : Materials Requirement Planning, Computerized Accounting, Wamp, MySql

This study generally aims to design an information system that can handle problems in putting and sorting goods into warehouses at CV. Sekar Intan KIC Gatsu, Semarang. In terms of using the Information System, CV. Sekar Intan KIC Gatsu, Semarang. In the transfer and sort of goods in the warehouse still using a manual system when the implementation, warehouse employees must take and place the goods to the warehouse that has been determined each - each type of item, so employees must calculate the number of items when the goods take place, here various problems occur, because it requires some HR to manage the warehouse performance process at CV. Sekar Intan.
To support the research, researchers used Research and Development (R & D) research methods through the microcontroller-based moving robot design simulation design stages that have been tested by experts declared valid with Valid validity levels and final product development design simulation prototypes carried out. goods transfer robot uses Arduino IDE development software that is integrated with Arduino Mega 2560, 6 pin line sensor, dc motor, motor driver, servo motor, motor driver, lcd, and has been tested in the field by General Adv. Administration and HRD as users / users and stated to be very effective.
Based on the results of the research and discussion, it can be concluded that the robot design system developed can overcome the problems in the old system on the CV. Sekar Intan KIC Gatsu Semarang, so as to produce a system that can facilitate work processes and parking processes for employees to be more effective and efficient.

The recruitment of new mechanics at Mataram Sakti is no longer through the training process at the head office, but new mechanics are placed at the dealership accompanied by the chief mechanic as a supervisor, with the aim of providing training to new mechanics in order to be able to service or periodically repair Yamaha products especially the latest motorbikes namely Yamaha NMAX, because of the flurry sometimes the mechanical head is not in place so that when the mechanic is experiencing problems it cannot directly ask the mechanical head causing the handling of repairs to be less effective and efficient.
One way to overcome this is to create a web-based expert system application with a forward chaining method so that the chief mechanic can transfer the knowledge he has into the computer. Forward chaining method is a search technique that starts with known facts and then matches these facts with the IF part of the IF-Then rules, so that conclusions can be drawn. This expert system was built using supporting software including, Macromedia Dreamweaver MX, PHP script language, MySQL database and WAMP server.
The expert system for diagnosing damage to Yamaha NMAX motorcycles using the forward chaining method can be used as a new mechanical learning media in diagnosing damage to NMAX motorcycles and as a means of chief mechanics transferring their knowledge.