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Journal : Conference SENATIK STT Adisutjipto Yogyakarta

Monitoring Departure to Schools in Basic School Students Using Arduino Based on Android Saputro, Eko; Kusumaningrum, Anggraini; Irawaty, Mardiana
SENATIK STT Adisutjipto Vol 4 (2018): Transformasi Teknologi untuk Mendukung Ketahanan Nasional [ ISBN 978-602-52742-0-6 ]
Publisher : Sekolah Tinggi Teknologi Adisutjipto

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (535.359 KB) | DOI: 10.28989/senatik.v4i0.262

Abstract

Student departure monitoring is an Android-based app used to monitor student departure to school. This system runs on parent smartphones so parents can see the existence of students and the app will give a message if the student out of the route path that has been set. Arduino used is arduino uno nano type. Arduino programmed using C language, to monitor the existence of students also required some components such as GSM Module and GPS Module. In testing the user application can monitor the existence of the students through the mobile phone that has been installed the application, before monitoring the departure of parents students are required to enter data coordinates home, coordinate data route and data coordinates of schools entered manually. To get the coordinate data the parent can take it through google Maps. To avoid failure in the use of remote control applications should use Android smartphone version 4.1 Jelly bean to version 6.0 Marshmallow. In the experiments this application can run smoothly with the Android version 4.1 to Android version 6.0 and the results of the questionnaire given to the 30 respondents with 9 questions 75.77% results obtained using Likert-scale calculations, which results obtained a good assessment interval.
Analysis of the Effect of Linear and Non Linear Loads on the Effectiveness of Single Phase Transformers Sudibya, Bambang; Irawaty, Mardiana
SENATIK STT Adisutjipto Vol 4 (2018): Transformasi Teknologi untuk Mendukung Ketahanan Nasional [ ISBN 978-602-52742-0-6 ]
Publisher : Sekolah Tinggi Teknologi Adisutjipto

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (237.518 KB) | DOI: 10.28989/senatik.v4i0.226

Abstract

Lately, PLN as the state electricity company that supplmost of the electricity needs in Indonesia is being hit by a "trial" which is in a row with the burning of several Interbus Transformers (IBT) in several regions. This can be caused by the rupture of the bushing so that it triggers a short circuit and results in the burning of the transformer. However, so far the investigation of other causes has been minimal as well as the effect of the load which is primarily a nonlinear load. Electricity is a device / device that can function if it is electrified. The device / tool is used to convert electrical energy into other energy such as motion, heat, light and so on. Electricity load consists of linear load and non linear load. changes in the use of linear loads to non-linear loads, among others, from incandescent lamps to TL lamps, and many non-linear loads that are widely used such as the use of induction motors (motors used in water pumps, refrigerators, air conditioners, etc.), rectifiers, static power converter (rectifiers and or inverters), electronic ballasts cause harmonics. Harmonics are sinusoidal waves with frequencies which are round multiples of the fundamental frequency. Harmonics can affect the work function of the transformer, which causes more heating to the iron core, which causes an increase in loss. In this study, the losses will be tested if the load is linear and also if it is loaded with non-linear loads. The results showed that for small loads, the response of the two loads showed almost the same current. While for moderate loads there is a difference that has not been so large, and for large loads large currents indicated there are large differences. So that the copper losses and iron losses are greater when the load is large. Given copper losses there is a current flowing in the transformer winding and the presence of resistance in the winding (I2R1 + I2R2). so that the increase in load current will increase copper losses. So thereby increasing copper losses causes a decrease in transformer efficiency.