At present the information of schools in various fields of education in the Tugu sub-district is still incomplete that only covers the TK / RA and SD / MI levels so that the wider community has not been able to obtain information on the level of education at SMP / MTs, SMA / SMK / MA and Higher Education, and to get this information the public must come directly to the Semarang City Education Office to find the data needed. The public cannot know quickly if there is a change in data or if there is a construction of a new school because the information is only written on the sub-district bulletin board.
Tugu sub-district is a sub-district in the city of Semarang, Central Java province. Tugu sub-district region is bordered by the Java sea in the north, in the east by West Semarang Sub- district, in the south by Ngalian sub-district, and in the west by Kendal district. Tugu sub-district has an area of ± 3.444,22 Ha hectares, consisting of 7 kelurahan, namely Jrakah, Tugurejo, Karanganyar, Randugarut, Mangkang Wetan, Mangunharjo and Mangkang Kulon [7]
Various suggestions appear to help equip human work to be more efficient and productive, we need a system that can help the work needed by a web-based Geographic Information System. Geographic Information System is a computer-based system for processing data or information that has a geographical dimension [1]. The program used in research uses the PHP programming language, JAVA SCRIPT because this program can be run on a server and is quite reliable using a MySQL database. [3]

This research generally aims to design a system that can overcome the problem at Wisma Menoreh Sampangan Hotel Semarang. In addition to the process of using bathroom equipment, a gas controller is needed in the bathroom, especially the ammonia and other gas levels in the bathroom . The bathroom control system at the Wisma Menoreh Sampangan Hotel in Semarang is currently considered ineffective, in the use of the bathroom equipment to hotel guests and hotel staff.The research method that I use is a Research and Development (R&D) research method that goes through stages of preliminary studies, planning, product development, testing, product design, product revision, and product testing. This system is made with the Arduino programming language. Based on the analysis, the ammonia gas detector in the Arduino-based bathroom can overcome the existing problems and help the hotel in controlling the bathroom, both to guests and hotel staff effectively and efficiently, as well as making it easier to manage bathroom rooms in the Hotel Wisma Menoreh Sampangan Semarang.

Hydroponics are now increasingly in demand, should be checked regularly so that hydroponic plants thrive. Likewise, in Siliwangi Indah Hydroponics Semarang, which still uses manual methods, namely the absence of a device that detects nutrient water temperature and pH automatically and the absence of tools that can normalize nutrients automatically. Arduino Uno R3 can be used to detect temperature automatically with a temperature sensor DS18B20, and detect pH with a pH sensor. Then the sensor readings are sent to the farmer's cellphone with SMS Gateway. The sensor readings are also used to divert the flow of nutrients from the spare reservoir, so that the nutrients remain normal. So this tool can automatically measure the nutrient water temperature and pH and replace the main nutrients to the reserve nutrients. And the assessment obtained from experts on this tool gets a value of 3.6 and from the expert gets a value of 3.7. Hydroponic nutrition in this study is maintained normally and farmers always know the nutritional state. So that the hydroponic plants thrive and have maximum yields.

The increase in motorized vehicles in urban areas is followed by an increase in cases of motorcycle theft due to the lack of public awareness about the motorcycle security system. The intensity of motorcycle theft with its disclosure is still far in comparison. Crime will also increase, such as cases of theft of motor vehicles, especially motorbikes. Cases of motorcycle theft still often occur, this happens because there is still a lack of security systems contained in motorized vehicles that only use ignition. the existence of an alternative safety system is needed because the average key of a conventional motorcycle is easily penetrated by thieves.
A double motorcycle safety device (Doble Smart Lock) composed of an RFID and Personal Identification Number (PIN) and an ATMega microcontroller. This system serves to provide two-stage security. The first stage is a microcontroller in the form of a PIN and the second stage is an RFID system. If the first stage breaks then it will enter the second stage, namely the RFID system
The results in the form of a main tool for motorcycle management consists of: Power supply, RFID Card, RFID Reader, Personal Identification Number (PIN), IC / Microcontroller ATMega and already running. The system testing process shows the number 3 in the expert validation test and the number 3 in the expert validation trial. Based on the above calculation, it can be concluded that the validation results from the expert show that the value of 3 is between 2 - 3, which is classified in the valid category. The system process shows the number 3 in the expert validation and the number 2.9 in the validation trial of the user. Based on the above calculation, it can be concluded that the validation results from the user point to a value of 2.9 between 2 - 3 which is classified in the valid category.

A musical instrument is a device created to produce sound. The price of musical instruments themselves varies depending on the type of instrument and the quality of the material used to make the instrument. At NU 07 Brangsong Middle School, there were no instruments except tambourines. That is because there is no funds to buy a musical instrument. The school allocates more funds to buildings or school buildings and scholarship assistance for underprivileged children and intelligent children. Thus students at the school cannot practice or hone their skills in music. From these problems can actually be solved by an arduino-based Piano, Harp, Marching Bell Digital instrument using laser light and LDR. Because this tool can be made at a low cost and can function more than one musical instrument. The working system of this tool is that there are several lasers that will emit light directly on the LDR sensor (in pairs). And when a pair of laser beams and LDR number one are blocked by an object or hand it will emit a piano sound with a "DO" motif. Furthermore, when a pair of laser beams and LDR number two are blocked, it will emit piano sound with the "RE" orientation and so on. This tool is also equipped with buttons that function as a selector of the type of sound that will be generated and the desired octave.

Security aspects is needed in various fields of life today. Safety is becoming a concern for everyone. One of the important concerns is the security of the room. The indoor security system uses Raspberry Pi and RFID based Firebase Cloud Messaging and Motion Detection Camera, is a room security system that includes expensive equipment, so this device is designed for protection or robbery and also provides assistance in advance. . The security system in this room consists of several parts, namely Raspberry Pi as a brain system, selenoid door lock as an electric lock on the door, RFID system and CCTV camera as a detector of the amount of human movement, PIR sensor as a detector of human temperature, alarm as an indicator of intruders which transfers rooms, and database applications as user storage databases for security recorders
 

YK store is a UKM (small and medium enterprises) whose activities are buying and selling wholesale goods such as oil, spices, noodles, flour, coconut milk, pepper, and others in moderation (wholesale). YK store manager does not have a bookkeeping application system for the process of making financial reports in accordance with financial accounting standards, and there is no support system for merchandise inventory which supports buying and selling transactions. Information systems for managing merchandise needed by companies to determine value according to transactions, for financial statements will use a journal of eternal methods to buy and sell transactions then post them to the ledger and make financial reports for all businesses. Bookkeeping information system design using microsoft visual basic 6.0, xammp as a server and mysql as a database. The results obtained from this information system can contain reports obtained in accordance with the types and financial statements for business activities

The Advancement of Science and Technology (Science and Technology) has been widely felt by the general public. Many people enjoy facilities or tools that can simplify and speed up their work. The advancement of science and technology covers various fields, including electronics, automotive machinery, medicine and others. Progress in the electronics sector is growing very rapidly. For example, now many electronic devices are used by the public, such as radio, television, fans and others. The advancement in the electronics field is increasingly sophisticated and modern. For example television, in ancient times we had to press the buttons that were attached to the television, to move the television waves, adjust the volume, and use other adjustment buttons. But now no longer, we can control or regulate the functions that exist on the television from where we sit using the remote control. In modern times like today remote control devices need to be developed so that we can control things from where we sit or from whatever we want, so that human work becomes easier and faster.

Jl Karanglo RW 03 Pedurungan Semarang is a densely populated environment, its people are very hungry for fast and accurate information. The internet is available which is relatively expensive as the main choice in finding the information needed. However, the cost is very expensive for a connection that must be paid every month. Although currently many CDMA and GSM modems available on the market are not enough to meet the need for speed of an internet connection. Although there are internet cafes established, they have not streamlined the cost and time of internet users in the area. The purpose of this study is to save the cost of bandwidth rental per month for unlimited connections, provide a stable internet connection that can be used for 24 hours straight, provide data transfer with bandwidth management, so as to better guarantee the quality of the internet connection. The system development method used is Prototyping which stages include identifying user needs, making a prototype, agreeing to the user, using a prototype. As a server, using Mikrotik Os where in Mikrotik Os there are several important and interesting features provided by Mikrotik itself, among those features are bandwidth management, firewall, DNS client chacing, and many other features provided by Mikrotik. With this Mikrotik provides stability of internet data transfer in accordance with the management of Mikrotik Os as a server. The client uses a Windows-based operating system, this is because the driver tool used is more compatible using a Windows operating system than using a Linux-based operating system, because it has to compile the driver.

Production of freshwater fish farming (ponds) in Kangkung Subdistrict in 2015 reached 4.42 tons or valued at 97.19 million rupiah and the condition is growing more and more. The number of fish seeds is measured conventionally by observing the senses of the eye and causing inaccurate (inaccurate) measurement results. This study offers a solution for counting fish by using a microcontroller based phototransistor technology. Phototransistor has a linear function of the received light intensity that is flowing current (ON) and if there is a condition of light intensity blocked by fish passing through it then the current does not flow (OFF). The trial results of the fish seed count tool have an accuracy of 97% so that it can be used by fish farmers.