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Kota surabaya,
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INDONESIA
Jurnal GEMATIKA
Published by STMIK STIKOM Surabaya
ISSN : -     EISSN : -     DOI : -
Core Subject : Education,
Education
Arjuna Subject : -
Articles 7 Documents
 1 
Mikrokontroller AT89C52 Dengan Melalui Sumber Energi Matahari Gozali, Moch
Jurnal GEMATIKA Vol 11, No 1 (2009)
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Abstract

Pertumbuhan dan perkembangan tanaman bisa terhambat atau terganggu karena kebutuhan air pada tanaman tidak tercukupi atau keberadaan air tanah yang berlebihan, Suatu upaya yang dilakukan dalam manjaga kondisi tanah sebagai media tumbuh tanaman khususnya pada masa pembibitan agar tidak sampai mengalami kekeringan dan kelebihan air adalah dengan pembuatan alat penyiram tanaman dengan kontrol automatik (pompa irigasi otomatik), dimana alat ini khusus untuk irigasi /penyiraman tanaman pada masa pembibitan. Alat Penyiram Bibit Tanaman Secara Otomatis dengan Tenaga Surya merupakan rangkaian elektronik yang terdiri dari 8 bagian utama selain pompa irigasi sebagai alat yang di kontrol. Bagian tersebut antara lain : rangkaian kontrol yang berupa mikrokontroller, rangkaian sensor, rangkaian pengkonversi dari analog ke digital, modul surya dari transistor 2N3055 sebagai sumber tegangan, baterai , inverter sebagai pengubah tegangan DC ke AC, rangkaian saklar elektronik dan driver motor stepper. Alat ini dioperasikan dengan sumber listrik yang berasal dari sinar matahari yang telah dirubah ke tegangan bola-balik melalui Inverter. Jadi alat ini dapat diterapkan pada tempat yang tiadak terdapat aliran listrik. Pusat kontrol dari alat ini terletak pada Mikrokontroler AT89C52, dimana mikrokontroler ini bertugas untuk memantau cukup atau kurangnya persediaan air melalui sensor yang terbuat dari dua buah probe karbon, yang ditempatkan pada salah satu polibag. Disamping itu mikrokontroler juga berfungsi untuk mengontrol arah dari modul surya melalui motor stepper agar modul surya dapat memperoleh sinar matahari secara optimal.
Cost Modelling For E-Learning Implementation In Higher Education With Fuzzy Activity Based Costing Sholiq, Ach; Pribadi, Apol; Algadri, Ach Naser
Jurnal GEMATIKA Vol 11, No 1 (2009)
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Abstract

This study presents a model of costing framework for the e-learning implementation by integrating the value chain, analysis, activity based costing, and fuzzy logic to Fuzzy Activity Based Costing (FABC). This method will be very useful in: (i) in the emerging economic era marked by rapid economic growth and global environmental uncertainty (ii) the limitations of historical accounting information. With the model can be known to the e-learning implementation costs per cost object that uses the e-learning, namely: (i) the cost per student, (ii) the cost per course, and (iii) the cost per Semester Credit System. The results obtained by the cost of implementation of e-learning in College XYZ per cost object is: (1) the cost per student of Rp 209,521.7 (2) The cost per course of Rp 8,333,250 (3) the cost per semester credit system of Rp 69.840.57. Research output is the estimation model of costing that can be used as a reference for noncollege or college institutions to conduct financial feasibility studies prior to implementing the e-learning
Deteksi Kadar Alkohol Dalam Tubuh Manusia Suparlan, Fumio Highy; Jusak, Jusak; Resmana, Susianto Tri
Jurnal GEMATIKA Vol 11, No 1 (2009)
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Abstract

Every year the number of motor vehicles increased street-traffic, this wil only cause the traffic accident rate higher street traffic. The reasons vary, one cause was an accident caused by drivers who drive a motor vehicle in a state affected by alcohol or in other words drunk driving. TGS 2620 sensor is one sensor that can detect alcohol content in the air, with the help of data from the sensor microcontroler can be sent to a computer and then processed in order to display the output in units of parts per milion (PPM). Research successfuly detected at levels of alcohol in the human body with 1.2236% error rate.
Sistem Pendukung Keputusan Pemilihan Televisi Menggunakan Metode Promethee Limanto, Susana
Jurnal GEMATIKA Vol 11, No 1 (2009)
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Abstract

Various facility, model, size and quality of television that are offered to the public can cause consumers to be confused to make decision about television that they want to buy. A web-based application program was developed to help consumers determine the best television based on their criteria. The application program is done by using Preference Ranking Organization Method for Enrichment Evaluation (PROMETHEE). The application program will display at most, the most five eligible televisions. Evaluation result from 10 respondents who want to buy a television show that about 70% of respondents agreed that this application program can help them to determine the best television they want.
Pengolahan Isyarat Jantung Berbasis Wavelet Untuk Deteksi Kelainan Infark Menggunakan Metode High Speed Qrs Detection Widodo, Bernarditus Sri
Jurnal GEMATIKA Vol 11, No 1 (2009)
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Abstract

A high precision is generally required by doctors in order to read the ECG records presented in the scaled paper. This research is conducted in order to realize a prototype which could help the doctors in the interpretation of ECG records for infarction detection. This research processes the already existing ECG records using wavelet noise elimination technique, which is then analyzed by using High Speed QRS Detection method in order to obtain some parameters of Q-Pathological wave as well as the elevation value of the ST segment. The final result is the detection of myocardial abnormalities, which is presented visually by using graphical user interface, working well.
Rancang Bangun Timer Delapan Kanal Menggunakan Metode Counter Tunggal Susanto, Pauladie; Ihyaudin, Ihyaudin
Jurnal GEMATIKA Vol 11, No 1 (2009)
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Untuk memenuhi beberapa kebutuhan secara simultan, maka dimplementasikan delapan unit Timer (Timer Delapan Kanal) dalam sebuah sistem berbasis mikrokontroler MCS51. Metode yang digunakan untuk menangani Timer Delapan Kanal tersebut adalah menggunakan sebuah Counter (Counter Tunggal). Pengaturan tiap kanal yang berfungsi untuk pengendalian perangkat elektronik dengan menggunakan relay. Sistem telah dapat mengendalikan delapan perangkat elektronik dengan pengaturan timer tunggal.
Rancang Bangun Robot Berkaki Enam Berbasis Mikrokontroler Mahendrayuda, I Gusti Ngurah Agung; Resmana, Susianto Tri; Martadinata, Yuwono
Jurnal GEMATIKA Vol 11, No 1 (2009)
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Abstract

Mechatronics appearance with presentation of robot as a form of its implementation making development of robotics world increasingly extends. To keep abreast with the robot development that is really fast in the world then The Hexapod Robot Base On Microcontroller is made. Differs from robot using wheel in general, robot using six-legs requires more complex calculation to do movement. Microcontroller is a complete system microprocessor in a single chip. The Hexapod Robot Base On Microcontroller is made with two servos and censor to detect barrier. But there is some problem that make the robot don.t run as desired.

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