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All Journal ELKHA : Jurnal Teknik Elektro TEKNOKOM : Jurnal Teknologi dan Rekayasa Sistem Komputer
Pauzan, Muh
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Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Energy Industrial & Manufacturing Engineering

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Penggunaan Pin ADC (Analog to Digital Converter) pada Mikrokontroler ATmega8535 untuk Menghasilkan Catu Daya Digital Pauzan, Muh; Yanti, Indri
ELKHA : Jurnal Teknik Elektro Vol.11 No.2, October 2019
Publisher : Faculty of Engineering, Universitas Tanjungpura

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2491.869 KB) | DOI: 10.26418/elkha.v11i2.35036

Abstract

Digital power supply with LM317 regulator have been built. The output voltage of LM317 regulator is digitalized by means of ADC pins in ATmega8535 microcontroller. 128 prescaler is used to make the microcontroller’s frequency in the region of ADC’s frequency, therefore ADPS0, ADPS1 and ADPS2 must be high (1). AVcc (5V) is used as voltage reference, it is means that REFS0, REFS1 is set to high (1) and low(0) respectively.   LCD 16x2 is used to display the voltage output of LM317. The research divided into three stages: theoretical study, simulation and implementation. Theoretical study consists of AC-DC conversion and digitalizing the output voltage of LM317. Aim of the study of AC-DC conversion is to know the specification of elements to build 30 V, 1 A power supply. Circuits and coding in ATmgea8535 for converting analog to digital is studied. Proteus software is used for designing the circuits and simulation while Atmel Studio for compiling the coding. The difference of voltage measurements is found between digital voltmeter and LCD in the implementation stage, the range is 0.2-3.19 V. After callibration, same voltage values both on voltmeter and LCD is displayed. It is concluded that minimum-maximum output voltage of power supply is 1.2-27.10 V.
RANCANGAN ALAT INDIKATOR LEVEL TEGANGAN BATERAI BERBASIS OPERATIONAL AMPLIFIER (OP AMP) Pauzan, Muh
TEKNOKOM Vol. 2 No. 1 (2019): TEKNOKOM
Publisher : Department of Computer Engineering, Universitas Wiralodra

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (520.315 KB) | DOI: 10.31943/teknokom.v2i1.26

Abstract

Telah dilakukan rancangan alat indikator level tegangan dengan memanfaatkan operational amplifier (op amp) sebagai komparator. Alat yang dibuat digunakan untuk mengetahui level tegangan dua baterai Li-Ion 3.7V yang disusun seri. Tegangan habis (end voltage) untuk dua baterai adalah 6 V dan tegangan maksimumnya 8.4 V. Tapi pada alat yang dibuat ditentukan 8 V sebagai tegangan maksimum. Terdapat empat indikator, pertama indikator LED merah untuk 25% (6.5V) tegangan baterai, LED kuning untuk 50% (7V), LED hijau untuk 75% (7.5V) dan LED biru untuk 100% (8V) tegangan baterai. LED akan menyala jika output op amp adalah high. Output high terjadi jika tegangan masuk Vin yang melalui pin 2 lebih besar daripada tegangan referensi ref pada pin 3 op amp.Dilakukan perhitungan secara teoritis kemudian dibuat rangkaiannya menggunakan softwareProteus.
Co-Authors Yanti, Indri