Kematian ikan suatu danau kadang terjadi akibat kualita ar yang tidak termonitoring dengan baik di danau tersebut, kemudian petani akan mengalami kerugian akibat hal tersebut. Untuk itu alat ini dibat untuk memonitoring kualitas air berdasarkan kadar PH air.sistem pada alat ini bertujuan untuk memberika peingatan dini ke peternak ikan untuk mengetahui ketika kualitas air danau sudah mendekati ambang batas berbahaya sehingg peternak ikan dapat segera mengatisipasinya untuk menghindari kerugian atas fenomena tersebut dapat diminimalisir. Selain itu data kualitas air yang diukur oleh sensor akan di teruskan ke petani ikan sehingga petani dapat mengetahuinya ketika tidak diarea tambak menggunakan pesan singkat sms. Pada saat sensor mendetesi kadar pH normal dengan rage pH 5-9 maka alat akan menyalakan lampu led berwarna hijau, pada saat sensor mendeteksi kadar pH tinggi dengan pH ≤ 4.9 maka alat akan menyalakan lampu led berwarna merah dan  mengirimkan notifikasi ke peternak ikan tambakan, begitupun ketika sensor mendeteksi kadar pH rendah dengan pH ≥9.1 maka alat akan menyalakan lampu led berwarna kuning kemudian mengirimkan notifikasi ke peternak ikan. Diharapkan dengan dibuatnya alat ini masyarakat sekitar terutama peternak ikan dapat memantau kualitas air dengan mudah.

The hospital is one of the health service institutions that conducts complete individual health services that provide inpatient, outpatient and emergency services. Where in the hospital is also a gathering place for many people, namely the patient and also the patient's family. This is also a factor that bacteria and microorganisms can grow rapidly. As found on the patient's tableware. Because the tableware used continuously and alternately will make bacteria grow faster, especially if the process of washing the cutlery is less clean. From this problem emerged the idea to design a tool "Electronic sterilization of tableware using ultraviolet radiation". This tool utilizes ultraviolet radiation that has been studied and has been tested to inhibit bacterial growth. This design is made by finding references originating from journals, books and also articles which are then made a plan or description of the tool that aims to plan what kind of tool will be made, design in the form of hardware in the form of connections between input devices, processes and also outputs , while the software in the form of a program as a system driver. After the design is complete, the tool will be tested and analyzed. Based on the analysis conducted, there are several types of bacteria found in these tableware. After being irradiated with UV light for 15 minutes of exposure, it is found that the bacteria that were originally attached to the cutlery can die completely. This is evidenced by testing conducted in the microbiology laboratory with supervision by experts in their field.

Kualitas kegiatan belajar di kelas yang diikuti oleh pelajar perlu diutamakan. Untuk mencapai kualitas kegiatan belajar tersebut salah satunya dengan cara meningkatkan kenyamanan dalam ruang kelas belajar itu sendiri. Sistem kenyamanan kelas yang ada pada saat ini dilakukan secara manual, misalnya menyalakan lampu dengan saklar dan menyalakan AC dengan remote. Dari penelitian ini dihasilkan alat pendeteksi kenyamanan kelas menggunakan 3 sensor (cahaya, suhu dan suara) beserta feedback (lampu, AC dan alarm) yang menyala dan mati secara otomatis. Perancangan prototype menggunakan Arduino Mega2560 sebagai mikrokontroler, LDR sebagai sensor cahaya beserta LED sebagai umpan baliknya, LM35 sebagai sensor suhu beserta Motor DC sebagai umpan baliknya dan Kondensor mikrofon sebagai sensor suara beserta Buzzer sebagai umpan baliknya. Setiap sudut ruang kelas terdapat 4 jumlah sensor pada setiap jenis masing-masing sensor yang ada. Dari jumlah 4 sensor yang sejenis pada setiap sudut tersebut dijumlahkan lalu dibagi 4 untuk mencari rata-rata kondisi ruang kelas kemudian feedback (lampu, AC dan alarm) akan menyala otomatis apabila ruang kelas terasa tidak nyaman. Hasil dari penelitian ini alat telah bekerja sesuai prinsip kerja yang telah ditentukan dan analisa data juga sesuai dengan perhitungan yang ada.

The development of automation technology has now been felt in all aspects of human life. The convenience and security offered in technology also has a positive impact, especially in the aspect of electrical energy. Public Street Lighting (PJU) is a means of street lighting provided by the Government to improve or optimize road equipment facilities in the form of street lighting tools in order to realize safety, security, order and smoothness of traffic as well as convenience for road users in traffic. Frequent blackouts and lack of supervision are inconveniences for public road users. monitoring technology for battery lighting and public street lighting (pju) with this microcontroller based telegram information system is designed to make it easier to monitor and monitor if the lights go out at night or there is a problem with the battery that can be fixed immediately, the results can be seen by the sensor ( LUX) which is used as an automatic switch that can turn off the lights during the day and turn on the lights at night. And also equipped with an automatic sensor switch (PIR) which if the vehicle is not detected the automatic light will dim and vice versa, if detected with a distance of 8 meters the vehicle automatically lights up. Can inform technicians by telegram of damage to lights and batteries on the road. This is done to increase comfort, efficiency, transportation safety and also to develop technological systems to be more innovative.

Work clothing is a type of clothing that is used specifically by a company or agency to perform a job for the benefit of the company. One of them is the work clothes worn by the substation and transmission maintenance team of PT. PLN (PERSERO). In the design and uniform provisions for transmission substation maintenance teams have been regulated in the Regulation of the Minister of Manpower and Transmigration of the Republic of Indonesia Number Per.08 / Men / Vii / 2010 concerning Personal Protective Equipment. The whole body must be covered by work clothes, SNI standard worker helmets, gloves and shoes. The entire body of the maintenance team must be protected to create security in carrying out the work of securing the area around the substation and transmission tower. In carrying out the work of substation and transmission maintenance teams are often exposed to direct sunlight. So that the maintenance team often feels stifling when working in a high enough ambient temperature, coupled with the uniform covering the whole body causes discomfort to the substation maintenance team and transmission due to excessive sweating. Meanwhile, work clothes that cover the whole body are an obligation for the safety of workers. From this research, the results of the cooling system for the field service for the maintenance team of PT. PLN PERSERO Based on Arduino Nano. The system design in the program uses the C programming language with Arduino software.The idea is to execute the design system, using the ATMega 328p microcontroller as a design control system with a DHT 11 sensor as a temperature sensor which will then activate the cooling fan as a cooling system and the buzzer as an indicator of high working environment temperature. Design system performance supported by 18650 battery power source.