Pengembangan Alat Uji Efisiensi Lampu Berbasis Mikrokontroller Arduino Uno untuk Evaluasi Tingkat Pencahayaan Lampu Meja Belajar di Laboratorium Fisika-Mekatronika Politeknik STTT Bandung

Abstract

In this research, a light efficiency test tool has been designed using an Arduino UNO microcontroller to provide an understanding of the use of the ohm law application in basic physics practicum. This lamp efficiency test prototype uses an LDR sensor device and a resistor connected to the Arduino microcontroller as a light intensity detector, while the variation of electrical power is used by an AC variac with the lamp distance to the sensor having a constant value. The experimental results showed that the efficiency of the lamp can be obtained through a gradient of the luminosity curve on electric power. The efficiency of the lamp is 16.935 lm/watt and the average resistance can be obtained on 983.01 which the intensity in lux is 337,05 lux on 157,68 Lm and the maximum intensity in lux can be obtained on 453,35 lux on 208,54 Lm.

A Development of Textile Fabric Homogeneity Based on Computational Physics (Image Processing) with MATLAB

“…17, no. 2, Agustus 2020(131-137) Upadhayaya, & Balasubramaniam, 2003, (Bellinson, 1940) , (Putra, Purnomosari, & Ngadiyono, 2016), and .…”

“…One pixel is equivalent to 0.03 cm or 0.01 inch with a unit of length. The application of computational physics in particular image processing in the textile field has been carried out by several researchers (Millman, Acar, & Jackson, 2001) (Ozkaya, Acar, & Jackson, 2003), (Ozkaya, Acar, & Jackson, 2005) (Ozkaya, Acar, & Jackson, 2007), (Ozkaya, Acar, & Jackson, 2008), (Cybulska, 1999), (Anbarasan, Upadhayaya, & Balasubramaniam, 2003), (Bellinson, 1940) , (Putra, Purnomosari, & Ngadiyono, 2016), and . Milman et.al.…”

“…Ozkaya, Acar, & Jackson (2003) states that the application of image processing is in the calculation of the twist of yarn using the Fourier transformation technique. Putra, Ngadiyono & Purnomosari (2016) states that digital image processing is a way for image analysis such as for analyzing area, shape, circumference and so on. Image processing is one form of signal processing in which an input is an image such as a photo or video frame, while an output from the image processing can be an image or a number of characteristics and a parameter relating to an input image.…”

“…According to Putra, Ngadiyono & Purnomosari (2016), MATLAB is a software that can be used in image processing. MATLAB (MATrix LABoratory) is a software program that can be used to analyze and compute a numerical data and MATLAB is also an advanced mathematical programming language and is generally used in the case of computational physics, which uses the properties and form of the matrix.…”