Penelitian eksperimental ini mencoba melakukan pengujian PLTMH pada tandon air dengan pipa 1/2" dengan variasi ketinggian yaitu 1 meter, 2 meter dan 3 meter serta penggunaan beberapa generator yang dipasang seri. Pengujian tersebut bertujuan untuk mengetahui ketinggian dan jumlah generator yang menghasilkan daya yang lebih optimal. Dalam melakukan analisis data, peneliti juga mengaplikasikan metode deskriptif dari Miles dan Huberman. Hasil uji eksperimental pertama yaitu untuk mengetahui nilai debit yang dikeluarkan sebesar 4.166 m3/s serta tekanan air yaitu 0.01 MPa diketinggian 1 meter, 0.02 MPa pada ketinggian 2meter serta 0.03 MPa diketinggian 3 meter. Hasil uji debit dan tekanan air dijadikan patokan dalam pengujian PLTMH dengan 5 macam sambungan. Pengujian generator DC dengan pemberian beban yaitu lampu LED 12V 3W. PLTMH menghasilkan daya yang optimal pada sambungan paralel III pada ketinggian 3 meter dengan daya sebesar 2.675 W serta tegangan 53.50 V dengan arus 0.050A. Hal ini dipengaruhi oleh ketinggian air maka tekanan air akan semakin bertambah, sehingga tekanan hidrostatis air membentur sudu-sudu turbin yang berdampak terhadap putaran generator yang menghasilkan daya tinggi.
Over time, technology has been embedded in our daily lives and will develop more and more rapidly. Because everything can facilitate us in activities, especially in a house. But the problem arises how we manage and control electronic equipment efficiently and comfortably. In this study, an intelligent control system based on IoT (Internet of Things) technology has been suggested to solve the above problem, namely with a smart home control system based on IoT (Internet of Things) with a radio frequency of 433 MHz as a command to send and be forwarded to several receivers on each - each relay uses an IoT (Internet of Things) application, namely Blynk on a smartphone, it can also be controlled manually using a wireless button control and can be controlled remotely with a frequency of 433mhz. Through a series of control modules, such as switch modules, radio frequency control modules, you can directly control all kinds of household appliances. With smart phone can also communicate with smart center controller via wireless router via Wi-Fi interface. Because it has a radio frequency of 433 MHz as the bottom control layer, tools can be added to or removed from the control system very easily. And this control system functions as a switch that is connected to several receivers to each relay.
Instrumentasi pengukur suatu besaran semakin banyak dikembangkan seiring dengan pesatnya perkembangan teknologi pada saat ini. Sistem instrumentasi pengukur besaran biasa digunakan untuk memonitoring besaran tersebut. Salah satu besaran yang dapat dimonitoring adalah suhu. Memonitoring suatu besaran memerlukan data logger untuk mencatat hasil pengukuran suatu objek. Data logger ini akan mencatat sesuai waktu yang ditentukan kemudian akan menyimpan data hasil pengukuran yang dilakukan. Data logger ini dirancang terhubung IoT yang mana dapat diakses dari jarak jauh menggunakan komputer ataupun smartphone. Perangkat mikrokontroler yang digunakan adalah Arduino MEGA 2560 dan perangkat IoT yang digunakan adalah Ethernet Shield W5100. Sensor yang akan mengukur suhu adalah sensor Thermocouple MAX6675 Type-K. Metode pengujian yang dilakukan dalam penelitian ini adalah pengujian kalibrasi sensor, first-order-system untuk mengetahui time constant yang diperlohen dari step response, dan laju perpindahan kalor. Hasil dari pengujian diperoleh rata-rata selisih antara antara sensor dengan termometer air raksa adalah kurangdari 1 ℃. Time constant saat suhu naik dan suhu turun cenderung sama besarnya. Harapannya kedepan dari hasil penelitian ini adalah dapat memudahkan user dalam memonitoring suhu yang ada pada suatu lokasi atau suhu pada suatu objek dengan tingkat selisih pengukuran kurangdari 1 ℃.
Embrace of open source software (OSS) has not been widespread although users of OSS will gain a lot of benefits and the society and the nation will get many advantages. This writing describes an observation to the understanding and attitude of a group of students towards the use of OSS. The students come from SMK Muhammadiyah 1 Surakarta which is a vocational school in Surakarta owned by Muhammadiyah organization. A survey was conducted during an OSS campaign. Students were faced with two sets of questionnaires; the first set was given prior and the seoncd after the campaign. The first set was aimed at identifying the computer literacy of the students and their understanding of the open source concept. The second set was aimed at exploring their understanding and attitude towards the use of OSS. Observation showed that the campaign activity improved students understanding of open source concept and enhance their attitude to use OSS. However, students were to some extent pragmatic when they were opted to select which software to use to accomplish a task. Kata kunci: sosialisasi, software open source, software terbuka
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