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All Journal JTET (Jurnal Teknik Elektro Terapan)
Bambang Supriyo, Bambang
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Computer Science & IT Electrical & Electronics Engineering

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Pengubah Pulsa Digital ke Tegangan untuk Sensor Kecepatan Putaran Berbasis Mikrokontroller Arduino Sayekti, Ilham; Supriyo, Bambang
JTET (Jurnal Teknik Elektro Terapan) Vol 3, No 1 (2014)
Publisher : Teknik Elektro - Politeknik Negeri Semarang

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Abstract

Pengubah Pulsa Digital ke Tegangan Untuk Sensor Kecepatan Putaran Berbasis Mikrokontroller Arduino adalah alat yang dirancang sebagai sensor putaran yang keluarannya adalah tegangan yang merepresentasikan dari jumlah putaran yang dinyatakan dalam rpm (Rotasi per Menit). Dengan menggunakan metoda penelitian berupa rancang bangun, sistem yang dibangun terdiri dari Mikrokontroller Arduino dan IC Digital to Analog Converter (DAC) seri MPC4921. Proses pengubahan pulsa digital menjadi tegangan dilakukan oleh Mikrokontroller Arduino melalui pemrograman pada Arduino, dengan cara pulsa-pulsa digital, dapat dari putaran motor, dan lainnya, diterima sebagai masukan oleh Arduino. Selanjutnya melalui program, pulsa-pulsa tersebut diubah menjadi data digital. Data digital tersebut selanjutnya diubah menjadi tegangan analog oleh Digital to Analog Converter (DAC) yang nilainya sebanding dengan jumlah putaran. Pengujian alat dilakukan dengan menggunakan jumlah pulsa per putaran (pulse per revolution, ppr) yang berbeda, antara lain 1 ppr sensor, 6 ppr sensor dan 60 ppr sensor dan 360 ppr sensor untuk setiap nilai rpm yang berbeda. Selanjutnya data tersebut diubah menjadi tegangan analog yang hasilnya dibaca melalui voltmeter digital. Dari hasil pengujian yang dilakukan untuk setiap jumlah ppr terhadap putaran rpm per satuan tegangan (volt), dengan data pengujian sebanyak 60 diperoleh nilai kesalahan sebesar 0,13%.
Pengembangan Alat Uji Komposisi Massa pada Logam Paduan Biner Menggunakan Sensor Load Cell dan Sensor Jarak Tipe Laser Slamet, Agus; Supriyo, Bambang; Putro, Wahju Djalmono
JTET (Jurnal Teknik Elektro Terapan) Vol 6, No 2: (Agustus 2017)
Publisher : Teknik Elektro - Politeknik Negeri Semarang

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The objective of this research is to develop and to test the prototype of equipment for testing the mass composition of a binary alloy metal. During testing, the alloy metal is placed inside the glass vessel filled with the liquid fluid, therefore the metal experiences a fluid pressure called as buoyancy. The mass composition of the alloy metal is determined based on the measurement of mass and volume of the alloy metal electronically. The mass of the alloy metal is measured using a load cell based electronic scale, while the volume of the alloy metal is indirectly determined based on the difference in fluid surface levels measured using a laser distance sensor before and after the alloy metal is dipped inside the fluid. The surface area of the glass vessel is always constant, therefore the volume of the fluid displacement which represents the volume of the alloy metal can be calculated using the standard volume formula. Three types of alloy metals with various compositions of Sn (70-80%) and Pb (15-30%) elements are used in this experiment. The experimental results show that the percentage differences in mass composition of the alloy metals measured using this equipment prototype are about  0,05% -11,76%.  The error percentage is bigger as the percentage composition of Sn element increases and the percentage composition of Pb element  decreases. This considerably error might be caused by the use of less precise laser distance sensor with thefinest detection of only about 1,01 mm in resolution.  A further research based on the use of more precise laser sensor with about 0.01 mm in resolution needs to be conducted to significantly  improve the quality measurement of the mass composition of the binary alloy metal.Keywords:  binary alloy, laser distance sensor, load cell. mass composition 
Rancang Bangun Sensor Cahaya Pendeteksi Api Pada Robot Cerdas Pemadam Api Politeknik Negeri Semarang Supriyo, Bambang; Sayekti, Ilham
JTET (Jurnal Teknik Elektro Terapan) Vol 6, No 3: (Desember 2017)
Publisher : Teknik Elektro - Politeknik Negeri Semarang

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Light sensor for fire detection has a significant role in Inteligent Fire Fighting Robot, because the detection result of the sensor is used to detect the availabilty of the fire source (candle light) in a room. If the fire is detected, then the robot will move to the fire source and finally extinguish the fire. A photo transistor which is sensitive to infra red light is used as the sensor.  The objective of the research is to test the photo transistor circuit and  to observe the voltage response of the emitter pin of the photo transistor with respect to the fire for various distances from 10 cm to 100 cm.  The collector pin of the photo transistor is connected to +5 Volt power supply, while the emitter part is connected to ground via the emitter resistor (Re).  The emitter voltage of the phoro transistor is read via Analog Input Pin A0  of Arduino UNO. This voltage represents the strength level of the fire detected by the photo transistor.  The data communication between Arduino UNO and computer is serially established via USB port. The data logging process is performed using Matlab/Simulink. Arduino UNO microcontroller is used to process the data such that the correlation between the sensor voltage and the sensor distance from the fire source can be identified.  Theexperimental results show that the use of emitter resistor (Re) 10 kOhm has the best voltage response with respect to the fire source for the distance of 10 cm to 60 cm, compared to Re = 4k7 Ohm  (for distance from 15 cm hingga 30 cm) and Re = 22k Ohm (for distance of 10 cm hingga 35 cm).  As a result, the combination of photo transistor and resistor (Re) of 10 kOhm can be applied for fire detection circuit for the distance up to 60 cm.Keywords : arduino uno, photo sensor, fire sensor
Co-Authors Abu Husain, Nurul Akmar Akmar Agus Slamet Dedy Ramdhani Harahap Feriadi, Indra Ilham Sayekti Putro, Wahju Djalmono Sugeng Ariyono, Sugeng