Development of automatic low cost light measurement system

Yeap, Kar Soon (2005) Development of automatic low cost light measurement system. Universiti Malaysia Sabah. (Unpublished)

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Abstract

A very simple and low cost visible light sensing instrument is developed. The proposed system uses a low cost light dependent resistor (LDR) as a sensor, an ADC0808CNN as a converter which can be interface to windows PC. The windows PC is use to display, collect and analyze data. The LDR (Unknown Specification) photoconductor cell used in the lighting system is compatible with a model of DSCD01 LDR (Dick Smith Electronics part no. Z4801) and used its resistance (R) to lux (L) equation. The approximate relationship between illumination (lux) and variable (volt) is calibrated and used. User can choose either lux or volt as unit when recording. The Graphic User Interface (GUI) data acquisition program is designed to start and stop recording data automatically. Data are saved to the variation of time in Microsoft excel file for later analysis. The proposed light measurement system was compared with a commercial calibrated international standard lux meter to measure its performance .The system proposed in this work gives a maximum range of 4.68V or 500,00 lux and the tolerances show ± 1 bit or 0.02V in the obtained result. The system sensitivity in reference unit of volt is higher than the system sensitivity in reference unit of lux.

Item Type: Academic Exercise
Uncontrolled Keywords: measurement system, light sensing, low cost dependent resistor, illumination, graphic user interface
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions: SCHOOL > School of Science and Technology
Depositing User: MDM SITI AZIZAH IDRIS
Date Deposited: 13 Jun 2013 00:34
Last Modified: 16 Oct 2017 06:37
URI: http://eprints.ums.edu.my/id/eprint/6251

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