期刊名称：International Journal of Electronics and Computer Science Engineering
电子版ISSN：2277-1956
出版年度：2013
卷号：2
期号：4
页码：1241-1251
出版社：Buldanshahr : IJECSE
摘要：The objective of the present paper is to explore an approach of constructing a simple, lo w cost colour sensor using tri colour RGB model which defines all colours as an additive combination of the primary colours Red, Green and Blue. The sensor consists of a normal Light Dependent Resistor (LDR), surrounded by three Red, Green and Blue LEDs as light source. The LDR and the LEDs are mounted in such a way so that the optical radiation fro m the LEDs get reflected and falls upon the LDR, the resistivity of which is inversely proportional to the intensity of colour from the LEDs. Therefore, the voltage drop across the LD R is varied whenever the light of different intensities fro m the LED falls upon it which in turn changes the angular position of the stepper motor. T hey can be employed for controlling the axial rotation of the stepper motor in robot arm movement to perform some task of manipulation or locomotion under automatic control. The experimental results show that the variation of the resistance of LDR with the change in colour generates an exponential slope and the plot of voltage drop across the LD R with respect to different colour shows a linear slope
关键词：Light dependent resistor; Intensity of Colour; Colour Sensor; Signal Conditioning
