CMOS COLOUR SENSOR BASED pH MEASUREMENT FOR WATER QUALITY ANALYSIS
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Description
A Real-Time pH measurement system using a novel design Programmable CMOS optical Colour light to frequency converter TCS230 is presented. The system uses Bogen’s universal indicator solution combined with a white light source and the Programmable CMOS colour sensor TCS230 to measure pH as a function of colour change in a sample. Bogen’s universal indicator solution causes a colour change in a sample according to the pH of the sample. The output frequency from the colour-sensitive CMOS RGB photodetector chip is proportional to the pH of the sample. Experimental results show that this Programmable CMOS Colour sensor system can determine the pH of a sample from pH 1 to 10 in real-time.
Keywords: Programmable CMOS optical Colour sensor TCS230, PIC Microcontroller 16F877A, pH measurement, RGB colour sensor, CIE colour space, Spectrometer .
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