Faculty Publications
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Item Experimental study on linear displacement measurement sensor using RGB color variation technique with PID controller(Institute of Electrical and Electronics Engineers Inc., 2017) Murthy, A.; Rao, S.S.; Herbert, M.A.; Karanth P, P.This study is based on experimental approach to linear displacement measurement using RGB color coding algorithm. This system is based on the auto-calibration procedure which can be implemented in a circuit, based on the temporal changes in the intensity of light, with the help of a light dependent resistor (LDR). The system consists of two LDRs and an LED placed on one side and an RGB color coded reflective paper on the opposite side. PIC microcontroller is used for powering the LED, processing of data for feedback control and to display the output on an LCD. LDR1 reading is used for displaying the relative linear distance, by mapping the voltage as a function of distance. This reading is used as a feedback to a PID controller to correct for the deviation in the measurement. Extensive experimental observations are conducted to analyze the reliability of the results in accordance to the wavelength of light reflected, the signal voltage and power output of the system. Investigation of the optimum positioning of the LED and the reflective RGB color coded paper is performed by repeatability analysis and hysteresis effects. Furthermore, the efficiency of the system is increased by implementing a PID controller upon investigating the different controller design, viz. P, PI and PID. A high resolution of 0.1 [mm] is obtained for such a simple and economical system, thereby making it highly efficient, in both minute measurements as well as over the entire bandwidth range of the visible light spectrum. © 2017 IEEE.Item Zero energy visible light communication receiver for embedded applications(Association for Computing Machinery, 2018) Prabhakar, T.V.; Shashidhar, V.; Meghana, G.S.A.; Venkatesha Prasad, R.V.; Pranavendra, G.V.Internet of Things is bringing multiple domains and multiple avenues to connect anything and everything. It mainly uses RF connectivity. However, recently visible light communication (VLC) is also being explored. VLC has the properties that are unique with respect to the privacy and security that it provides. Though the transmission is of broadcast in nature the receiver needs to be in the vicinity of the transmitter, thus providing secure communications. Further, when low power receivers need to be constructed, it is important to harness energy from transmission itself. In this article we propose a novel design for a receiver to be used in VLC for embedded systems. The setup works, using a small solar panel (2mm × 2mm) as a medium to simultaneously harvest incident light energy and receive data bit streams. The LED source was modulated using On-Off Keying. The receiver works for close range communications. The results in this paper show experimental evaluation of the system. We could detect the signals from the source using harvested energy from the same transmission. © 2018 Authors.